Twisted-Pair Ethernet Transceiver Plus (TPEX Plus) DISTINCTIVE CH

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Twisted-Pair Ethernet Transceiver Plus (TPEX Plus) DISTINCTIVE CH

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Am79C100
Twisted-Pair Ethernet Transceiver Plus (TPEX Plus)
DISTINCTIVE CHARACTERISTICS
CMOS device provides IEEE 802.3-compliant operation operating current from single supply Power Down mode reduced power consumption battery-powered applications Automatic twisted-pair link integrity Pin-selectable twisted-pair receive polarity detection automatic inversion receive signal. Polarity indication output directly drive LED. Pin-selectable twisted-pair link integrity test capability conforming IEEE 802.3 standard. Link status directly drive LED. Transmit, receive, collision status indications available separate, dedicated pins Outputs directly drive LEDs with pulses stretched ensure visibility Internal twisted-pair transmitter digital predistortion circuit reduce medium-induced jitter Pin-selectable Test (heartbeat) enable loopback, Jabber Control, Test functions comply with 10BASE-T standard User-selectable loopback operations Pin-selectable twisted-pair receive threshold programming extended distance line lengths
GENERAL DESCRIPTION
Am79C100 Twisted-Pair Ethernet Transceiver Plus (TPEX Plus) integrated circuit that implements medium attachment unit (MAU) functions twisted-pair medium, specified supplement IEEE 802.3 standard (Type 10BASE-T). This device provides necessary electrical functional interface between IEEE 802.3 standard attachment unit interface (AUI) twisted-pair cable. network based 10BASE-T standard unshielded twisted-pair cables, providing economical solution networking allowing existing telephone wiring. Am79C100 provides minimal component count cost-effective solution design implementation 10BASE-T standard networks. TPEX Plus provides twisted-pair driver receiver circuits, including on-board transmit digital predistortion, receiver squelch, port with pin-selectable Test enable. device provides number additional features, including Link Status indication with automatic twisted-pair receive polarity detection/ correction indication; pin-selectable receive threshold programming extended distance line lengths; Receive Carrier Sense, Transmit Active Collision Present indications. device provides separate twisted-pair Link Status, Polarity Status, Receive, Transmit, Collision outputs drive LEDs directly.
Publication# 16511 Rev: Amendment/0 Issue Date: 1994
BLOCK DIAGRAM
TEST1 TEST2 RXPOL LNKST
Driver Logic Line Receiver Squelch Circuit Line Driver Predistortion TXD+ TXD- TXP+ TXP-
Jabber Control
TEST PRDN/RST REXT Attachment Unit Interface (AUI)
Line Driver
Collision Loopback Control
Link Test State Machine
Line Driver
Polarity Detection Auto Correction Voltage Controlled Oscillator
Line Receiver Smart Squelch
RXD+ RXD-
Twisted-Pair Interface
16511B-1
RELATED PRODUCTS
Part Am7996 Am79C90 Am79C900 Am79C940 Am79C960 Am79C961 Am79C965 Am79C970 Am79C974 Am79C98 Am79C981 Am79C987 Description IEEE-802.3/Ethernet/Cheapernet Transceiver CMOS Local Area Network Controller Ethernet(C-LANCE) Integrated Local Area Communications Controller(ILACCTM) Media Access Controller Ethernet (MACETM) PCnet-ISA Single-Chip Ethernet Controller (for bus) PCnet-ISA Single-Chip Ethernet Controller (with Microsoft® Plug Play support) PCnet-32 Single-Chip Ethernet Controller (for 386DX, buses) PCnet-PCI Single-Chip Ethernet Controller (for bus) PCnet-SCSI Combination Ethernet SCSI Controller Systems Twisted-Pair Ethernet Transceiver (TPEX) Integrated Multiport Repeater Plus(IMR+TM) Hardware Implemented Management Information Base(HIMIBTM)
Am79C100
CONNECTION DIAGRAM
PLCC
TXD+ TXD- TXP+
DVSS DVSS LNKST AVSS
TXP- DVDD TEST2 TEST1 TEST AVDD
RXPOL RXD- REXT PRDN/RST RXD+
16511B-2
LOGIC SYMBOL
DVDD Attachment Unit Interface (AUI) TEST TEST1 TEST2 REXT PRDN/RST DVSS
AVDD TXD+ TXP+ TXD- TXP- Am79C100 RXD+ RXD- RXPOL LNKST AVSS Twisted-Pair Interface
16511B-3
Am79C100
ORDERING INFORMATION Standard Products
standard products available several packages operating ranges. order number (valid combination) formed combination elements below.
AM79C100
OPTIONAL PROCESSING Blank Standard Processing
OPERATING CONDITIONS Commercial (0°C +70°C)
PACKAGE TYPE 28-Pin Plastic Leaded Chip Carrier 028)
SPEED Applicable DEVICE NUMBER/DESCRIPTION Am79C100 Twisted-Pair Ethernet Transceiver Plus (TPEX Plus)
Valid Combinations AM79C100
Valid Combinations Valid combinations list configurations planned supported volume this device. Consult local sales office confirm availability specific valid combinations check newly released combinations.
Am79C100
DESCRIPTION AVDD
Analog Power This supplies analog portions TPEX Plus circuitry.
LNKST
Link Status Input/Output, Open Drain When this tied LOW, internal Link Test Receive function disabled, Transmit Receive functions will remain active regardless arriving idle link pulses data. TPEX Plus continues generate idle link pulses irrespective status this pin. output, this driven link identified functional. However, link determined nonfunctional missing idle link pulses data packets, then this driven (internally pulled HIGH). output state, capable sinking maximum used drive LED. absence external drive, internally pulled HIGH when inactive.
AVSS
Analog Ground This ground reference analog portions TPEX Plus circuitry.
CI+,
Control Output port differential driver.
Collision Output, Open Drain This driven while TPEX Plus simultaneously receiving data pins twisted-pair pins, indicating that collision condition exists. also driven TPEX Plus enters jabber condition excessive length activity pair. this case TPEX Plus will wait period inactivity "unjab" time before pattern pair removed returns inactive. will driven during Test activity pair. output state, capable sinking maximum used drive LED. output pulse stretched after collision, ensure visibility.
Receive Threshold Input, Active When this tied LOW, internal twisted-pair receive thresholds reduced from their original values (approximately normal 10BASE-T value). With HIGH state, unsquelch threshold RXD± circuit will peak. With state, unsquelch threshold RXD± circuit will peak. either case, RXD± circuit post unsquelch threshold will approximately one-half initial unsquelch threshold.
PRDN/RST
Power Down/Reset Input, Active Driving this input resets internal logic TPEX Plus places device special Power Down mode. Power Down/Reset mode, output drivers placed their inactive state.
DI+,
Data Output port differential driver.
DO+,
Data Input port differential receiver.
REXT
External Resistor Input external precision resistor connected between this AVDD order provide current reference internal voltage-controlled oscillator (VCO).
DVDD
Digital Power This supplies digital portions TPEX Plus circuitry, including transmit drivers.
Receive Output, Open Drain This driven while TPEX Plus receiving data twisted-pair pins transferring received signal onto pair. output during collision simultaneously with pin.
DVSS
Digital Ground pins provide ground reference digital portions TPEX Plus circuitry, including transmit drivers status indication drivers.
Am79C100
output state, capable sinking maximum used drive LED. output pulse stretched after reception, ensure visibility.
RXD+, RXD-
Receive Data Input 10BASE-T port differential receiver.
(Station MAU), TPEX Plus transfers data independently from TXD/TXP circuits from circuit. TEST HIGH state (Repeater MAU), then data circuit transmitted back onto TXD/TXP circuits data circuit transmitted onto pair. During either test mode, Collision Detection Test functions disabled, will remain idle. Link beat pulses will continue generated normally absence TXD/TXP output activity, Link Test Receive State Machine will forced into Link Pass state. will driven whenever link beat pulse transmit data activity commences, remain during output activity. receive squelch will continue operate both RXD± input circuits. absence external drive, internally pulled LOW.
RXPOL
Receive Polarity Input/Output, Open Drain twisted-pair receiver capable detecting receive signal with reversed polarity (wiring error). RXPOL normally state, indicating correct polarity received signal. receiver detects received packet with reversed polarity, then this driven (goes HIGH) polarity subsequent packets inverted. output state, this sink maximum therefore capable driving LED. This feature disabled strapping this LOW. this case, Receive Polarity correction circuit disabled internal Receive Signal remains noninverted, irrespective received signal. absence external drive, internally pulled HIGH when inactive.
TEST2
Test Input, Active This should tied HIGH normal operation. TEST2 reserved factory testing, should permanently tied HIGH. absence external drive, internally pulled HIGH.
TEST
Signal Quality Test (Heartbeat) Enable Input, Active Test function enabled tying this input LOW. When enabled, TPEX Plus will send burst (heartbeat) lines after become inactive, indicating integrity collision detection circuitry. TEST should disabled repeater applications. absence external drive, internally pulled HIGH when inactive.
TXD+, TXD-
Transmit Data Output 10BASE-T port differential drivers.
TXP+, TXP-
Transmit Predistortion Output Transmit waveform differential driver predistortion.
Transmit Output, Open Drain This driven while TPEX Plus receiving data pair transmitting data TXD/TXP pins. output during collision simultaneously with pin. output state, capable sinking maximum used drive LED. output pulse stretched after transmission, ensure visibility.
TEST1
Test Input, Active HIGH This should tied normal operation. TEST1 permits system-level diagnostics performed. TEST1 driven HIGH (while TEST2 maintained HIGH), TPEX Plus will enter Loopback Test mode. type loopback determined state TEST pin. TEST state
Am79C100
FUNCTIONAL DESCRIPTION
Twisted-Pair Ethernet Transceiver Plus (TPEX Plus) complies with requirements specified IEEE 802.3 standard attachment unit interface (AUI) 10BASE-T standard twisted-pair medium attachment unit (MAU). TPEX Plus also implements number features addition IEEE 802.3 standard. outline functions Am79C100 given below.
account insertion loss MHz, which typical type receive filters/transformers recommended (see also Table Normal 10BASE-T-compatible receive thresholds employed when inactive (HIGH). When externally pulled LOW, Receive Threshold option invoked, sensitivity TPEX Plus receiver increased. This allows longer line lengths employed, exceeding target distance normal 10BASE-T (assuming typical cable). additional cable distance contributes directly increased signal attenuation reduced signal amplitude TPEX Plus receiver. However, from system perspective, making receiver more sensitive means that also more susceptible extraneous noise, primarily caused coupling from co-resident services (crosstalk). this reason, recommended that when using Receive Threshold option, service should installed 4-pair cable only. Multipair cables within same outer sheath have lower crosstalk attenuation, allow noise emitted from adjacent pairs couple into receive pair, sufficient amplitude falsely unsquelch TPEX Plus.
Attachment Unit Interface (DO±, DI±, CI±)
electrical functional characteristics comply with those specified within IEEE 802.3 documents, Sections pins wired isolation transformer, remote application, directly another device (e.g., Am7992B serial interface adapter), case local application. end-of-packet Test function (heartbeat) disabled allow device employed repeater application.
Twisted-Pair Transmit Function
Data transmission 10BASE-T medium occurs when valid signals appear differential pair. This data stream routed differential driver circuitry TXD± TXP± pins. driver circuitry provides necessary electrical driving capability predistortion control transmitting signals over maximum length twisted-pair cable, specified IEEE 802.3 10BASE-T standard. During transmission, data looped back differential circuit, indicating normal operation. transmit function data output loopback operations meets propagation delays jitter specified standard. During normal transmission, providing that TPEX Plus Link Fail Jabber state, will driven LOW, used drive status directly.
Link Test Function
Link Test function implemented specified 10BASE-T standard. During periods transmit pair inactivity, "link beat" pulses will sent periodically over twisted-pair medium allow constant monitoring medium integrity. When Link Test function enabled, absence link beat pulses receive data RXD± pair will cause TPEX Plus into Link Fail state. Link Fail state, data transmission, data reception, data loopback, collision detection functions disabled remain disabled until valid data consecutive link pulses appear RXD± pair. During Link Fail, LNKST internally pulled HIGH. When link identified functional, LNKST driven LOW, capable directly driving "Link LED. order interoperate with systems that implement Link Test, this function disabled grounding LNKST pin. With Link Test disabled, data driver, receiver, loopback functions, well collision detection, remain enabled irrespective presence absence data link pulses RXD± pair.
Twisted-Pair Receive Function
receiver complies with receiver specifications IEEE 802.3 10BASE-T standard, including noise immunity received signal rejection criteria ("Smart Squelch"). Signals meeting these criteria appearing RXD± differential input pair routed outputs. receiver function meets propagation delays jitter requirements specified standard. receiver squelch level drops approximately half threshold value after unsquelch allow reception minimum amplitude signals mitigate carrier fade event worst-case signal attenuation crosstalk noise conditions. During receive, driven used drive status directly. Note that 10BASE-T standard defines receive input amplitude external media-dependent interface (MDI). Filter transformer loss specified. TPEX Plus receiver squelch levels defined
Polarity Detection Reversal
TPEX Plus receive function includes ability invert polarity signals appearing RXD± pair polarity received signal reversed (such case wiring error). This feature allows data packets received from reverse-wired RXD± input pair corrected TPEX Plus prior transfer interface (DI±).
Am79C100
polarity detection function activated following reset Link Fail, will reverse receive polarity based both polarity previous link beat pulses polarity subsequent packets with valid transmit delimiter (ETD). When Link Fail state, TPEX Plus will recognize link beat pulses either positive negative polarity. Exit from Link Fail state caused reception consecutive link beat pulses identical polarity. entry Link Pass state, polarity last link beat pulses used determine initial receive polarity configuration receiver reconfigured subsequently recognize only link beat pulses previously recognized polarity. This link pulse algorithm employed only until polarity determination made, described later this section. Positive link beat pulses defined received signal with positive amplitude greater than (LRT HIGH) with pulse width This positive excursion followed negative excursion. This definition consistent with expected received signal correctly wired receiver, when link beat pulse that fits template Figure 14-12 10BASE-T standard generated transmitter passed through twisted-pair cable. Negative link beat pulses defined received signals with negative amplitude greater than (LRT HIGH) with pulse width This negative excursion followed positive excursion. This definition consistent with expected received signal reverse-wired receiver, when link beat pulse that fits template Figure 14-12 10BASE-T standard generated transmitter passed through twisted-pair cable. polarity detection/correction algorithm will remain "armed" until consecutive packets with valid identical polarity detected. When "armed," receiver capable changing initial previous polarity configuration based most recent polarity. receipt first packet with valid following reset Link Fail, TPEX Plus will utilize inferred polarity information configure RXD± input, regardless previous state. receipt second packet with valid with correct polarity, detection/correction algorithm will "lock received polarity. second subsequent) packet detected confirming previous polarity decision, most recently detected polarity will used default. Note that packets with invalid have effect updating previous polarity decision. Once consecutive packets with valid have been received, TPEX Plus will disable detection/correction
algorithm until either Link Fail condition occurs PRDN/RST asserted. During polarity reversal, RXPOL internally pulled HIGH. During normal polarity conditions, RXPOL driven LOW, capable directly driving "Polarity using integrated driver. desired, Polarity Reversal function disabled grounding RXPOL pin.
Twisted-Pair Interface Status
Three outputs (XMT, RCV, COL) indicate whether TPEX Plus transmitting (AUI twisted-pair), receiving (twisted-pair AUI), collision state with both functions active simultaneously. TPEX Plus will power Link Fail state. normal algorithm will apply allow enter Link Pass state. power XMT, RCV, drivers activate lamp test feature, will then their inactive state until TPEX Plus enters Link Pass state. Link Pass state, transmit receive activity that passes pulse-width/amplitude requirements RXD± inputs will indicated pin, respectively, going active. XMT, RCV, asserted during collision. Link Fail state, XMT, RCV, disabled. Jabber Detect mode, TPEX Plus will activate driver, disable driver (regardless activity), allow driver indicate current state RXD± pair. there receive activity RXD±, only will active during Jabber Detect. there RXD± activity, both will active. three outputs active incorporate drive capability with pulse stretch circuitry, extend event ensure visibility.
Collision Detect Function
Simultaneous Carrier Sense (presence valid data signals) both pins twisted-pair RXD± pins constitutes collision, thereby causing signal asserted output pair, output activated. output meets drive requirements interface. This signal will remain pair until colliding states changes from active idle. During collision condition, data presented pair will sourced from RXD± input. collision, data presented pair will sourced from last remaining active input, either RXD± DO±. output pair stays HIGH times collision, decreasing idle level within times after last transition. XMT, RCV, pins driven during collision.
Am79C100
Signal Quality Error (SQE) Test (Heartbeat) Function
When TEST driven LOW, TPEX Plus will routinely exercise collision detection circuitry generating Test message every transmission. This signal self-test indication that collision circuitry functional cable/connection intact. Test message consists signal pair with duration times (500 1500 ns). When enabled, Test will occur every transmission, starting times (600 1600 after last transition transmitted signal. repeater applications, Test function disabled tying TEST HIGH leaving disconnected. output will remain inactive during Test message CI±.
Following rising edge signal PRDN/RST, TPEX Plus will remain reset state Immediately after reset condition removed, TPEX Plus will drive XMT, RCV, outputs lamp test feature, will forced into Link Fail state. TPEX Plus will move Link Pass state only after link beat pulses and/or single received message detected RXD± pair.
Test Modes
TPEX Plus implements types loopback test modes suitable Station (DTE) Repeater applications. test mode entered driving TEST1 HIGH. TEST2 intended factory test only should tied HIGH test mode normal operation. available test modes are: Station (DTE): TEST LOW. Data received input pair transmitted onto TXD± TXP± output pairs, data received RXD± input pair transmitted onto output pair. Repeater: TEST HIGH. Data received input pair looped back onto output pair, data received RXD± pair looped back retransmitted twisted-pair drivers (TXD± TXP± pairs). both modes, TPEX Plus will forced into Link Pass state will enter Link Fail state, regardless RXD± inactivity. following functions disabled: jabber circuit, collision detection, collision oscillator. functions that remain enabled are: RXD± squelch circuits, outputs, link beat pulse generation, polarity detection/ correction. addition, both modes, (not used indicate collision during test modes) will active duration transmit activity TXD±/TXP± pairs, providing leading high-to-low edge indicating start packet transmission link beat pulse generation. Upon exiting either test modes, Link Test State Machine will forced into Link Fail state. RXPOL pulled receive polarity correction will disabled.
Jabber Function
Jabber function inhibits twisted-pair transmit function TPEX Plus circuit active excessive period ms). This prevents node from disrupting network "stuck faulty transmitter. this maximum transmit time exceeded, TPEX Plus transmitter circuitry disabled signal driven onto pair. Once transmit data stream removed from input pair, "unjab" time will elapse before TPEX Plus removes signal from pair re-enables transmit circuitry. When jabber detected, TPEX Plus will activate driver, disable driver (regardless activity), allow driver indicate current state RXD± pair. there receive activity RXD±, only will active during Jabber Detect. there RXD± activity, both will active.
Power Down
addition on-board power-on-reset circuitry, PRDN/RST used master reset TPEX Plus. PRDN/RST must driven minimum reset occur. PRDN/RST also used TPEX Plus into inactive "sleep" state, causing device consume less power. This feature useful battery-powered low-duty-cycle systems. Driving PRDN/RST resets internal logic TPEX Plus places device into idle mode. this mode, twisted-pair driver pins (TXD±, TXP±) driven LOW, pins (CI±, DI±) pulled AVDD, LNKST RXPOL pins inactive state, XMT, RCV, pins high-impedance state. TPEX Plus will remain idle mode long PRDN/RST asserted.
TPEX Plus External Components
Figure shows typical twisted-pair port external components schematic. resistors used should have tolerance ensure interoperability with 10BASE-T-compliant networks. filters pulse transformers necessary devices that have major influence performance compliance TPEX Plus-based MAU. Specifically, transmitted waveforms heavily influenced filter characteristics twisted-pair receivers employ several
Am79C100
criteria continuously monitor incoming signal's amplitude timing characteristics determine when assert internal carrier sense. these reasons, crucial that values
tolerances external components specified. Several manufacturers produce module that combines functions transmit receive filters pulse transformers into package.
TXD+ TXP+ TXD- TXP-
57.6 324.0 768.0 57.6 324.0
XMIT Filter
Twisted-Pair Cable
Am79C100 TPEX Plus
RXD+ RXD- RECV Filter
Module
16511B-4
Note: filter/transformer module shown available from following manufacturers: Belfuse, TDK, Pulse Engineering, PCA, Valor Electronics, Nano Pulse.
Figure Typical Twisted-Pair Port External Components
Am79C100
Station/DTE Loopback Test Mode Note
Repeater Loopback Test Mode Note
TXD±/TXP±
TXD±/TXP±
RXD±
RXD±
TEST1
TEST2 TEST
TEST1 TEST2 TEST
HIGH
HIGH
HIGH
HIGH
HIGH
16511B-6
Note: During Loopback, does indicate collision, instead provides indication TXD±/TXP± activity. details, refer section titled "Test Modes."
Figure Am79C100 TPEX Plus Loopback Operation
Am79C100
ANLG Optional ANLG 40.2 Pulse Transformer AVDD DONote DINote
100.0
0.01µF 0.1µF 40.2 ANLG
57.6 324.0 57.6 768.0 324.0
ANLG
Connector AVSS TXD+ TXP+ TXDTXPRXD+ RXDAm79C100 Optional Enable Heartbeat LNKST ANLG REXT 24.3 TEST1 TEST2 PWDN/RST DVDD DGTL DGTL RXPOL DVSS Optional TEST Enable Threshold LINK Optional DGTL Filter Note Filter Filter Transformer Module
RJ45 Connector
SYSTEM APPLICATIONS
Am79C100
0.1µF 4.7µF DGTL
DGTL
Notes: Compatible filter modules, with brief description package type features included Table this section. resistor values recommended general purpose use, should allow compliance 10BASE-T specification template jitter performance. However, overall performance transmitter also affected transmit filter configuration. Compatible transformer modules, with brief description package type features included Table this section.
116511B-7
Figure Am79C100 Stand Alone System Application
Table TPEX Plus Compatible Media Interface Modules
Manufacturer Fuse Fuse Fuse Valor Electronics Valor Electronics Valor Electronics Nano pulse Nano pulse Nano pulse Pulse Engineering Pulse Engineering Fuse Part A556-2006-DE 0556-2006-00 0556-2006-01 PT3877 PT3983 FL1012 NP6612 NP6581 NP6696 HIM3000 PE65421 SUPRA 0556-6392-00 Package 16-pin 0.3" 14-pin 14-pin 16-pin 0.3" 8-pin 0.3" 16-pin 0.3" 16-pin 0.3" 8-pin 0.3" 24-pin 0.6" 14-pin 24-pin 0.6" 16-pin 0.3" 16-pin 0.5" 16-pin 0.5" Description Transmit receive filters transformers Transmit receive filters transformers Transmit receive filters, transformers common mode chokes Transmit receive filters transformers Transmit receive common mode chokes Transmit receive filters transformers, transmit common mode choke Transmit receive filters, transformers common mode chokes Transmit receive common mode chokes Transmit receive filters, transformers common mode chokes Transmit receive filters transformers Transmit receive filters, transformers common mode chokes Transmit receive filters transformers Transmit receive filters transformers, transmit common mode choke Transmit receive filters, transformers, common mode chokes
Table Am79C100 TPEX Plus Compatible Transformers
Manufacturer Fuse Valor Electronics Pulse Engineering Part A553-0506-AB LT6031 100-3E PE64106 Package 16-pin 0.3" 16-pin 0.3" 16-pin 0.3" 16-pin 0.3" Description
Am79C100
ABSOLUTE MAXIMUM RATINGS
Storage Temperature: -65°C +150°C Ambient Temperature Under Bias: +70°C Supply Voltage AVSS DVSS (AVDD, DVDD): -0.3
Stresses above those listed under Absolute Maximum Ratings cause permanent device failure. Functionality above these limits implied. Exposure absolute maximum ratings extended periods affect device reliability.
OPERATING RANGES
Commercial Devices Temperature (TA): +70°C Supply Voltages (AVDD, DVDD): inputs within range: AVSS-0.5 AVDD DVSS-0.5 DVDD +0.5
Operating ranges define those limits between which functionality device guaranteed.
CHARACTERISTICS over COMMERCIAL operating range unless otherwise specified
Parameter Symbol Parameter Description Input Voltage Input HIGH Voltage Output Voltage (XMT, RCV, COL, LNKST RXPOL) Input Leakage Current (PRDN/RST) Input Leakage Current (LNKST/RXPOL, output inactive) Output Leakage Current (XMT, RCV, COL) Input Current DO+, Open Circuit Input Common Mode Voltage (Bias) Differential Mode Input Voltage Range (DO±) Squelch Threshold Switching Threshold Differential Output Voltage |(DI+)-(DI-)| |(CI+)-(CI-)| Differential Output Voltage Imbalance Differential Idle Output Voltage Differential Idle Output Current Common Mode Output Voltage (Note (Note (Note (Open Drain) Test Conditions Unit
Digital Input Voltage
Digital Output Voltage
Digital Input Leakage Current IILL IILD DVSS DVDD DVSS DVDD
Digital Output Leakage Current IOLD IIAXD VAICM VAIDV VASQ VATH VAOD VAODI AVSS AVDD AvDD -500 AVDD -3.0 -2.5 -160 AVDD -1.0 +2.5 -275 1100 DVSS DVDD
VAODOFF IAODOFF VAOCM
AVDD
Am79C100
CHARACTERISTICS (continued)
Parameter Symbol IIRXD RRXD VTIVB VTIDV VTSQ+ VTSQ- VTHS+ VTHS- VLTSQ+ VLTSQ- VLTHS+ VLTHS- VRXDTH VTXH VTXL VTXI VTXOFF IIREXT Parameter Description Input Current RXD± RXD± Differential Input Resistance RXD+, RXD- Open Circuit Input Voltage (Bias) Differential Mode Input Voltage Range (RXD±) Positive Squelch Threshold (Peak) Negative Squelch Threshold (Peak) Post-Squelch Positive Threshold (Peak) Post-Squelch Negative Threshold (Peak) Positive Squelch Threshold (Peak) Negative Squelch Threshold (Peak) Post-Squelch Positive Threshold (Peak) Post-Squelch Negative Threshold (Peak) Switching Threshold TXD± TXP± Output HIGH Voltage TXD± TXP± Output Voltage TXD± TXP± Differential Output Voltage Imbalance TXD± TXP± Idle Output Voltage TXD± TXP± Differential Driver Output Impedance Input Current REXT DVDD (Note REXT 24.3 AVDD PRDN/RST HIGH DVDD AVDD PRDN/RST PRDN/RST HIGH DVDD AVDD PRDN/RST Test Conditions AVSS AVDD (Note AVDD Sinusoid Sinusoid Sinusoid Sinusoid (Note DVSS (Note DVSS (Note -500 AvDD -3.0 -3.1 -520 -293 -312 -175 DVDD -0.6 DVSS AvDD -1.5 -300 -150 -180 DVDD DVSS Unit
Twisted Pair Interface
Power Supply Current Power Supply Current (Idle) Power Supply Current (Transmitting-No load) Power Supply Current (Transmitting-with load) IDDPRDN Power Supply Current Power Down Mode
Notes: Parameter tested. Uses switching test load.
Am79C100
SWITCHING CHARACTERISTICS over COMMERCIAL operating ranges
Parameter Symbol Parameter Description Transmit Timing tPWODO tPWKDO tTON tTSD tTETD ttTHD tTLD tTHDP tTLDP tXMTON tXMTOFF tPERLP tPWLP tPWPLP tJREC Pulse Width Accept/ Reject Threshold Pulse Width Maintain/ Turn-Off Threshold Transmit Start Delay Transmit Static Propagation Delay (DO± TXD±) Transmit Transmit Delimiter Transmitter Rise Time (10% 90%) Transmitter Fall Time (90% 10%) Transmitter Rise Fall Time Mismatch TXD+ TXD- Delay TXD+ TXD- Delay TXP+ TXP- Delay TXP+ TXP- Delay Asserted Delay De-asserted Delay Idle Signal Period Link Beat Pulse Width Predistortion Idle Link Beat Width Transmit Jabber Activation Time Transmit Jabber Reset Time Transmit Jabber Recovery Time (Minimum time between transmitted packets prevent jabber activation) Startup Delay Static Propagation Delay (Note (Note (Note Steady State (Note Steady State (Note Steady State (Note Steady State (Note tTSD tTSD tTSD tTSD Test Conditions |VASQ max| (Note |VASQ max| (Note tTSD tTSD tTSD tTSD Unit
tDODION tDODISD
Am79C100
SWITCHING CHARACTERISTICS (Continued)
Parameter Symbol Parameter Description Test Conditions >VTHS (Note Tested with Sinusoid tRON (Note (Note tRSD tRSD tRSD tRSD tRON tRON tCON 1600 1500 tCON Unit
Receive Timing Pulse Width Maintain/ tPWKRD Turn-Off Threshold tRON tRVB tRSD tRETD tRHD tRLD tRCVON tRCVOFF tCON tCOFF tPER tCPW tSQED tSQEL tCOLON tCOLOFF Receiver Start Delay (RXD DI±) First Validly Timed Receiver Static Propagation Delay (RXD± DI±) Transmission Delay Delay DI+, DI-, CI+, Rise Time (10% 90%) DI+, DI-, CI+, Fall Time (10% 90%) Rise Fall Time Mismatch (tRR tRF) Asserted Delay De-asserted Delay Collision Turn-On Delay (CI±) Collision Turn-Off Delay (CI±) Collision Period (CI±) Collision Output Pulse Width (CI±) Test Delay Time Test Length Asserted Delay De-asserted Delay
Collision Detection Test
Notes: Parameter tested. Uses switching test load. pulses narrower than tPWODO (min) will rejected; pulses wider than tPWODO (max) will turn internal carrier sense pulses narrower than tPWKDO (min) will maintain internal carrier sense pulses wider than tPWKDO (max) will turn internal carrier sense off. pulses narrower than tPWKRD (min) will maintain internal carrier sense pulses wider than tPWKRD (max) will turn internal carrier sense off.
Am79C100
SWITCHING TEST CIRCUITS
DVDD DVDD
TXD+ TXD- Includes test capacitance DVSS
16511B-8
Test Point TXP+ TXP- Includes test capacitance DVSS
16511B-9
Test Point
Twisted Pair Transmit Test Circuit
AVDD
52.3 Test Point
AVSS
16511B-10
Transmit Test Circuit
Am79C100
SWITCHING WAVEFORMS
WAVEFORM INPUTS Must Steady Change from Change from Don't Care, Change Permitted Does Apply OUTPUTS Will Steady Will Changing from Will Changing from Changing, State Unknown Center Line HighImpedance "Off" State
KS000010
Am79C100
SWITCHING WAVEFORMS
PWODO ASQ(min) ASQ(max) TXD+ tTLDP TXP+ THDP TXDt TXPtXMTON DODISD DODION XMTOFF TETD ATH+ tPWKDO ATHt
tPWKDO
16511B-11
Transmit Timing
PWPLP
TXD+
TXP+
TXD-
TXP-
PWLP
PERLP
Transmit Link Beat Pulse
16511B-12
Am79C100
SWITCHING WAVEFORMS
PWKRD TSQ+ TSQ- tRETD PWKRD
RXD±
RCVON
RCVOFF
Receive Timing
16511B-13
VTHS+ RXD± THS-
TSQ+
VTSQ-
VLTSQ+ LTHS+ RXD± VLTHS- VLTSQ-
16511B-14
Receive Thresholds
Am79C100
SWITCHING WAVEFORMS
RXD± COFF
COLON
16511B-15
CPER
COLOFF
Collision Timing
SQED
SQEL
16511B-16
Test Timing
Am79C100
Trademarks Copyright 1998 Advanced Micro Devices, Inc. rights reserved. AMD, logo, combinations thereof trademarks Advanced Micro Devices, Inc. Am186, Am386, Am486, Am29000, bIMR, eIMR, eIMR+, GigaPHY, HIMIB, ILACC, IMR, IMR+, IMR2, ISA-HUB, MACE, Magic Packet, PCnet, PCnet-FAST, PCnet-FAST+, PCnet-Mobile, QFEX, QFEXr, QuASI, QuEST, QuIET, TAXIchip, TPEX, TPEX Plus trademarks Advanced Micro Devices, Inc. Microsoft registered trademark Microsoft Corporation. Product names used this publication identification purposes only trademarks their respective companies.

Twisted-Pair Ethernet Transceiver Plus (TPEX Plus) DISTINCTIVE CH

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