Ethernet Transceiver Module with Board Isolation Transformer DC/DC Con

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Ethernet Transceiver Module with Board Isolation Transformer DC/DC Con

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Ether Module EM2H Ether Module TM-EM2H 10Base-2 10Base-2
Ethernet Transceiver Module with Board Isolation Transformer DC/DC Converter
97176
This document Logic document. reference SEEQ Technology should considered Logic.
Note: Check latest Data Sheet revision before starting designs. SEEQ Data Sheets Web, access SEEQ Home Page www.seeq.com Logic www.lsilogic.com
Introduction
Thin (Cheapernet) module provides complete Local Area Network interface station, without transceiver cable. EM2H encased module containing circuit components complete Thin COAX interface includes on-board SEEQ CMOS 83C92C transceiver DC/DC converter isolation transformer. module compatible with ANSI/IEEE 802.3 8802-3. module part chipset manufactured SEEQ Technology provide basic components interface board. other components include 80C03, 8005/80C04A Advanced Ethernet Data Link Controllers (AEDLC TM), 8020 8023A Manchester Code Converter (MCC TM), 80C24 Media Interface adapter (MIA).
Collision Test Generator, externally deselectable work with ANSI/IEEE 802.3 8802-3 repeater. Detects reports network collisions both transmit receive modes. Implemented with SEEQ proprietary high voltage (20V) high performance CMOS process. Loopback test detects network cable opens shorts. Power Reset prevents transmission during power Regulated Converter board. Disable power-down module. Isolation Transformer board. Optimized Repeater Applications. EM2H Available Adapter Card Applications
Features
module compatible with ANSI/IEEE 802.3 8802-3 Standards Thin (10BASE2). Contains Thin COAX transceiver functions within single encased unit. Squelch circuits signal inputs eliminate noise.
RECEIVE STATION LINE DRIVER COLLISION SIGNAL STATION SQUELCH TRANSMIT FROM STATION REGULATED DC/DC CONV JABBER TIMER COLLISION COMPARATOR LINE DRIVER
RECEIVE EQUALIZER SQUELCH DATA BUFFER PASS FILTER COLLISION REFERENCE BUFFER COAX CABLE
OFFSET COLLISION TEST GENERATOR
OSILLATOR 1N916
TRANSMITTER
Figure Ethernet Transceiver Module Block Diagram
AEDLC, Ether Module trademarks SEEQ Technology, Inc.
MD400153/B
Ether Module EM2H 10Base-2
Description
Thin module connects station equipment Thin (Cheapernet) COAX cable. on-board 83C92C CMOS COAX transceiver provides drive current wave shaping transmit signals. supplies receive signal equalization, collision detection squelch. Transmit Data Input. balanced line receiver input module from transmit packets. Heartbeat Enable. This input enables Collision (also called Heartbeat) Test when connected ground, disables test when connected VEE. Ground. System Ground referenced VCC. Network Signal Receiver. Connects network COAX center conductor, receives packet data detects collision voltage level. Network Signal Transmitter. Connects network COAX center conductor through internal 1N916 diode, transmits signals from network. Collision Detect Sense. Connects directly network shield, references collision detection voltage level.
Description Functions
FUNCTION Collision Output. balanced differential output station equipment when collision detected, when excessive data transmission occurs (jabber), during Collision Test (Heartbeat Test). Receive Data Output. Line Driver output Receive inputs. Negative Supply. Nominally volts referenced COAX shield ground. on-board DC-DC power converter provides volt power on-board module isolation from station equipment prevent ground loop current.
VIEW
Figure Ethernet Transceiver Module Configuration
MD400153/B
Ether Module EM2H 10Base-2
Disable module active signal (internal pullup) that utilized turn Ether module event alternative transceiver used, power conservation purposes. signal disabled when transmitting prevent noise network. COAX cable shorted open, transmitted data appears Receiver input. This condition detected station equipment running loopback test. Collision Detection Collision detector monitors COAX Center Conductor senses voltage conditions created collision, where COAX shield used reference. collision condition detected when more stations transmitting, whether local Transmitter activated. This called Receive Mode Collision Detection. detector signals collision sending oscillator signal through Collision Pair (CD±) MCC. HeartbeatTest performed each transmitted data packet verify operation detector. collision causes -2.0 volt average level center conductor network cable. This level passes through 4-pole Bessel low-pass filter averaging. resulting signal measured voltage comparator against threshold voltage about -1.5 volts. collision indicated when center conductor average level more negative than level threshold VCD. line driver enabled within onset collision, signal sent station equipment. Heartbeat Test short burst collision signal generated immediately after transmission packet. This test enables collision signal about
Description Module Functions
module five main functions, shown block diagram. These Transmitter; Collision Detector; Jabber Timer; Receiver; DC/DC Converter. on-board SEEQ 83C92C provides functions except DC/DC conversion signal isolation. Transmitter Transmitter takes differential output signals from MCC, outputs these signals correct levels network. transmit signal sent module balanced differential pair (TX±). squelch circuit prevents Transmitter Output from responding noise pair. Transmitter open-collector current driver output using supply. Rise fall times controlled ns/V lessen higher harmonics. Drive current levels bandgap voltage reference internal resistor. internal diode also added reduce COAX loading capacitance comply with ANSI/IEEE specifications. transmit squelch circuit blocks signals with pulse widths less than nanoseconds, (negative-going), with levels less than -175 millivolts. squelch circuits turn Transmitter packet signal stays higher than -175 millivolts more than nanoseconds. Figure Transmitter Timing Diagram.
VTSQ
VTSQ TOFF
TRANSMIT ENABLE
Figure Transmitter Timing
MD400153/B
Ether Module EM2H 10Base-2
microsecond starting about microseconds after transmission. This test disabled operation with repeaters connecting Jabber Timer Jabber Timer monitors operation Transmitter, using Oscillator time base. Transmitter operates continuously more than typically Milliseconds, Jabber Timer disables Transmitter enables Collision Detector outputs. Transmitter automatically re-enabled after station been silent milliseconds. Receiver Receiver detects signal COAX center conductor that triggers squelch circuits, sends signal through differential line driver MCC. Receiver provides amplification equalization; squelch circuit prevents noise from activating Receiver circuits. Figure receive signal goes through buffer with high input impedance capacitance reduce loading reflections network COAX. equalizer passes high frequencies attenuates frequency signals from network, flattening network pass band. signal output through differential line driver presenting balanced signal station. line driver nanosecond rise fall times. 4-pole Bessel low-pass filter provides average level from received signal. sends this level Collision Comparator Squelch circuits. squelch circuit activates Receive Line Driver only when detects true signal. This prevents noise triggering receiver. When packet detected, level from Low-pass Filter becomes more negative than squelch threshold, Receiver turns squelch circuit timing detects high level signals more than nanoseconds, turns Receiver off. within microsecond (typical) low_pass filter level becomes more positive than squelch threshold, then receiver stays off. Receiver Timing Diagram, Figure System Connections diagram shows transceiver connections station environment. differential signals biased pull-down resistors isolated from MCC. supply converted converter. This converter also provides isolation between volt volt sides. COAX center conductor connects Receive Transmit pins transceiver. internal diode minimizes network loading when power off. COAX capacitance contributed Thin module less
THRESHOLD ROFF
RECEIVER SQUELCH LOW-PASS FILTER
THRESHOLD
RECEIVE ENABLE
Figure Receiver Timing
MD400153/B
Ether Module EM2H 10Base-2
than MHz, powered unpowered, transmitting. CDS, Collision Detection Sense detects Collision reference level. This ground-referenced sense pin. should connected directly COAX shield prevent ground-loop interference. Transceiver assembly includes Converter pulse transformer RX±, signal isolation.
SYSTEM
NETWORK COAX CENTER CONDUCTOR
D0-D7
8020 8023A
NCORE 80C04A 80C03
LPBK COLL
0.01
SHIELD 0.01
MANCHESTER CODE CONVERTER
A0-A3
DATA LINK CONTROLLER
TxEN TxC*
ETHER MODULE
0.01
CONTROL
EM2H EM2C
Figure Coax Ethernet Transceiver System Connections
MD400153/B
D8-D15
SYSTEM
RJ-45
TPO-
0.01
ETHER MODULE
TPI+ TPI-
MEDIA INTERFACE ADAPTER 80C24
EM2H EM2C
TRANSFORMER
0.1µF
OPTIONAL MODE INPUTS
DIGITAL POWER/GND ANALOG POWER/GND
Ether Module EM2H 10Base-2
Figure Multiple Media Transceiver Connections
MD400153/B
A0-A3
D0-D7
D8-D15
DATA LINK CONTROLLER
CONTROL
NCORE 80C04A 80C03
TxEN
ADUPLX COLL
NETWORK COAX CENTER CONDUCTOR
2CT:1 TPO+
SHIELD
Ether Module EM2H 10Base-2
Absolute Maximum Ratings*
Input Voltage Operating Temperature Storage Temperature Isolation Voltage 500V Isolation Voltage 500V
Operating Parameters Module
Input (TAP) Capacitance Crxi+Ctxo Isolation Impedance Ziso
*COMMENT: Stresses above those listed under "Absolute Maximum Ratings" cause permanent damage device. This stress rating only functional operation device these other conditions above those indicated operational sections this specification implied. Exposure absolute maximum rating conditions extended periods affect device reliability.
Operating Parameters Isolation Transformer
Primary Open Circuit Inductance Constant Rise Time Pri/Sec Leakage Inductance Pri/Sec Capacitance Winding Resistance Turns Ratio Isolation Insulation Resistance CW/W 2000 VRMS 10,000 250V) UNIT(S)
Operating Parameters Converter
Input Voltage Input Current Efficiency Ripple Voltage
UNIT(S)
4.75
5.25
MD400153/B
Ether Module EM2H 10Base-2
Electrical Characteristics
Symbol ICC1 ICC2 IRXI ITDC ITAC VTSQ RRXI RTXO HC2,3 HC4,5 HC6,7 Parameter Supply Current Transmitting Supply Current Transmitting
±5%, 70°C (See Notes -1.49
[1][7]
Units
Receive Input Bias Current (RXI)[3] Transmit Output Current Level (TXO) Transmit Output Current Level (TXO) Collision Threshold (Receive Mode)[2] Differential Output Voltage (RX±, CD±) Common Mode Output Voltage (RX±, CD±) Common Mode Output[7] Voltage (RX±, CD±)[2] Transmitter Squelch Threshold (TX±) Capacitance[4] Shunt Resistance-Non Transmitting (RXI) Shunt Resistance-Transmitting(TXO) Second Third Harmonics Fourth Fifth Harmonics Sixth Seventh Harmonics
-1.53 -2.0
ITDC -1.58 ±1200 -2.5
±550 -1.5
Idle State Differential Offset Voltage (RX±, CD±)
-175
-225
-300
Harmonic Content Relative Fundamental
NOTES impact system performance, since twisted pair transformer isolated. required meet ANSI/IEEE 802.3 8802-3 specifications. currents into device pins positive, currents device pins negative. voltages referenced ground unless otherwise specified. Measured RXI. Guaranteed through characterization. Current measured while first forcing volt measuring current, then forcing volts measuring current. Thus:
first volt differential voltage) surpass squelch level. Current measured while first forcing volt measuring current, then forcing volts measuring current. Calculation same item above. Values shown internal module shown indicate module capability only. Values shown duty cycle, 100% duty cycle ICC2
MD400153/B
Ether Module EM2H 10Base-2
Recommended Operating Conditions
Supply Voltage (VCC) Ambient Temperature 70°C
Switching Characteristics
Symbol tTST ttRON tCON tCOFF tHON Parameter
±5%, 70°C
±2.0
Units bits bits bits bits
Transmitter Startup Delay TXO)[2] Transmitter Propagation Delay TXO) Jabber Activation Delay (TX± CD±)[2] Jabber Reset Timeout (TX± CD±) Receiver Propagation Delay (RXI RX±) Mismatch Receiver Startup Delay (RXI RX±) Collision Turn-On Delay Collision Turn-Off Delay Collision Frequency (CD±) Collision Pulse Width (CD±)
11.5
Heartbeat Delay (TX± CD±) Heartbeat Duration (CD±)
NOTES typicals given required meet ANSI/IEEE 802.3 8802-3 specifications.
MD400153/B
Ether Module EM2H 10Base-2
Timing Load Diagrams
Figure Heartbeat Timing
Figure Jabber Timing
Input Jitter Output Jitter Difference
Figure Receive Jitter Timing
MD400153/B
Ether Module EM2H 10Base-2 Ordering Information
EM2H Ether Module 10Base-2 Repeater Applications
Revision History
8/12/96
Page Mechanical Drawing: Overall package length reduced from 1.102 0.02 1.095 0.030 Package width changed from 0.990 0.975 0.025 Dimension from stand-off package bottom specified 0.025 (nom.) Package thickness changed from 0.415 (max.) 0.400 (max.) Lead width tolerance added 0.018 0.003. Lead row- to-row spacing specification refined, note replacing "from shoulder shoulder" seating plane".
6/25/97
Document revision changed MD400153/B Page Mechanical Drawing Reference 0.400 Max. been changed 0.415 Marking Specifications have been deleted. Reference dimension 0.098 been deleted. Note been added; Dimensions measured point where leads start narrow.
MD400153/B
Ether Module EM2H 10Base-2
Module
1.095 0.030
SEEQ Ether Module EM2H Digit Test Date Code)
0.975 0.025
0.010 0.002 0.415 Max.
0.025
Note
0.101 ±0.03 0.100 0.900 0.018 0.003
NOTES dimensions inches. Dimensions include mold flash. Allowable mold flash .010. Dimension measured seating plane. Tolerances .010 unless otherwise specified. solder dipped leads, thickness will .020 max. Pins missing. Dimensions measured point where leads start narrow.
MD400153/B
0.177 0.02
1.020 0.01 Note

Ethernet Transceiver Module with Board Isolation Transformer DC/DC Con

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