DESCRIPTIO Single Chip Provides Complete LocalTalk®/AppleTalk Por

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DESCRIPTIO Single Chip Provides Complete LocalTalk®/AppleTalk Por

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LTC1323 Single AppleTalk Transceiver
DESCRIPTIO
Single Chip Provides Complete LocalTalk®/AppleTalk Port Operates From Single Supply Protection ±10kV Receiver Inputs Driver Outputs Power: 2.4mA Shutdown Reduces 0.5µA Receiver Keep-Alive Function: 65µA Differential Driver Drives Either Differential AppleTalk Single-Ended EIA562 Loads Drivers Maintain High Impedance Three-State with Power Thermal Shutdown Protection Drivers Short-Circuit Protected
APPLICATI
LTC1323 multi-protocol line transceiver designed operate AppleTalk EIA562-compatible singleended networks while operating from single supply. There versions LTC1323 available: 16-pin version designed connect AppleTalk network, 24-pin version which also includes additional single-ended drivers receivers necessary create Apple-compatible serial port. on-board charge pump generates supply which used power external devices. Additionally, 24-pin LTC1323 features micropower keep-alive mode during which single-ended receivers kept active monitor external wake-up signals. LTC1323 draws only 2.4mA quiescent current when active, 65µA receiver keepalive mode, 0.5µA shutdown, making ideal battery-powered systems. differential driver drive either differential AppleTalk loads conventional single-ended loads. driver outputs three-state when disabled, during shutdown, receiver keep-alive mode, when power off. driver outputs will maintain high impedance even with output common-mode voltages beyond power supply rails. Both driver outputs receiver inputs protected against damage ±10kV.
LocalTalk Peripherals Notebook/Palmtop Computers Battery-Powered Systems
registered trademarks Linear Technology Corporation. AppleTalk LocalTalk registered trademarks Apple Computer, Inc.
TYPICAL APPLICATI
0.33µF CPEN TXDEN SHDN RXEN RXDO
LTC1323 CHARGE PUMP
0.33µF
FILTER
FILTER
FILTER FILTER FILTER FILTER FILTER FILTER
LTC1323 TA01
100pF
LTC1323 ABSOLUTE RATI
Driver Short-Circuit Duration Indefinite Operating Temperature Range 70°C Storage Temperature Range 65°C 150°C Lead Temperature (Soldering, sec). 300°C Supply Voltage (VCC) Input Voltage Logic Inputs 0.3V 0.3V Receiver Inputs ±15V Driver Output Voltage (Forced) ±15V
PACKAGE/ORDER ATIO
VIEW TXD- TXD+ RXD- RXD+
ORDER PART NUMBER LTC1323CG
VIEW RXD+
CPEN TXDEN SHDN RXEN RXDO
PGND
PACKAGE 28-LEAD PLASTIC SSOP
TJMAX 150°C, 96°C/W
VIEW TXD+ RXD+ PGND
ORDER PART NUMBER LTC1323CSW
CPEN TXDEN SHDN RXEN RXDO
PACKAGE 24-LEAD PLASTIC WIDE
TJMAX 125°C, 85°C/W
Consult factory Industrial Military grade parts.
ORDER PART NUMBER LTC1323CS
TXDEN SHDN RXEN RXDO
PACKAGE 16-LEAD PLASTIC
TJMAX 125°C, 85°C/W
LTC1323 ELECTRICAL CHARACTERISTICS
SYMBOL Supplies Normal Operation Supply Current Receiver Keep-Alive Supply Current Shutdown Supply Current Negative Supply Output Voltage Load, SHDN CPEN TXDEN RXEN Load, SHDN CPEN VCC, TXDEN RXEN Load, SHDN VCC, CPEN TXDEN RXEN ILOAD 10mA (Note (Figure VCC, RTXO (Figure
±10%, 70°C (Notes
UNITS
PARAMETER
CONDITIONS
fOSC
Charge Pump Oscillator Frequency Differential Output Voltage Change Magnitude Differential Output Voltage Differential Common-Mode Output Voltage Single-Ended Output Voltage Common-Mode Range Short-Circuit Current Three-State Output Current Load (Figure (Figure
Differential Driver
Differential Driver VCMR Load SHDN CPEN Power SHDN CPEN Power Off, Load SHDN CPEN TXDEN Power SHDN CPEN TXDEN Power Off, (Note (Note RXEN
±4.0 ±3.7 ±200
Single-Ended Driver (Note VCMR Receivers Input Resistance Differential Receiver Threshold Voltage Differential Receiver Input Hysteresis Single-Ended Input, Voltage Single-Ended Input, High Voltage Output High Voltage Output Voltage Output Short-Circuit Current Output Three-State Current
Single-Ended Output Voltage Common-Mode Range Short-Circuit Current Three-State Output Current
±4.5 ±3.7 ±200
±100
LTC1323 ELECTRICAL CHARACTERISTICS
SYMBOL Logic Inputs tPLH, tPHL Input High Voltage Input Voltage Input Current Differential Driver Propagation Delay Differential Driver Propagation Delay with Single-Ended Load Single-Ended Driver Propagation Delay Differential Receiver Propagation Delay Single-Ended Receiver Propagation Delay Inverting Receiver Propagation Delay Keep-Alive Mode, SHDN CPEN tSKEW Differential Driver Output Output Differential Driver Rise/Fall Time Differential Driver Rise/Fall Time with Single-Ended Load Single-Ended Driver Rise/Fall Time tHDIS, tLDIS Differential Driver Output Active Disable Receiver Output Active Disable tENH, tENL Differential Driver Enable Output Active Receiver, Enable Output Active VEER Supply Rise Time from Shutdown Receiver Keep-Alive Logic Input Pins Logic Input Pins Logic Input Pins 100, 100pF (Figures 100pF (Figures 100pF, (Figures (Note 15pF (Figures 15pF (Figures (Note 15pF (Figures (Note
±10%, 70°C (Notes
±1.0 UNITS
PARAMETER
CONDITIONS
Switching Characteristics
100, 100pF (Figures 100, 100pF (Figures 100pF (Figures 100pF (Figures (Note 15pF (Figures 15pF (Figures 15pF (Figures 15pF (Figures 0.33µF, CVEE
denotes specifications which apply over full operating temperature range. Note Absolute maximum ratings those values beyond which life device impaired. Note currents into device pins positive; currents device pins negative. voltages referenced ground unless otherwise specified.
Note typicals given 25°C. Note ILOAD external current being sunk into pin. Note These specifications apply 24-pin Wide package only.
LTC1323 TYPICAL PERFORMANCE CHARACTERISTICS
Charge Pump Output Voltage Load Current
-2.0
CHARGE PUMP OUTPUT VOLTAGE
DIFFERENTIAL DRIVER OUTPUT
-2.5 -3.0 -3.5 -5.5
25°C LOAD RESISTANCE
SINGLE-ENDED DRIVER OUTPUT
25°C RL(DIFF) RL(SE) VTXI
LOAD CURRENT (mA)
Supply Current Temperature
3.50
DIFFERENTIAL DRIVER OUTPUT
SUPPLY CURRENT (mA)
3.00 2.75 2.50 2.25 2.00 1.75 1.50 TEMPERATURE (°C)
TEMPERATURE (°C)
SINGLE-ENDED DRIVER OUTPUT
3.25
LOAD
LTC1323 TPC01 LTC1323 TPC04
Differential Driver Swing Load Resistance
Single-Ended Driver Swing Load Resistance
25°C
LOAD RESISTANCE
LTC1323 TPC02
LTC1323 TPC03
Differential Driver Swing Temperature
Single-Ended Driver Swing Temperature
TEMPERATURE (°C)
LTC1323 TPC05
LTC1323 TPC06
LTC1323
CTIO
LTC1323CS
CHARGE PUMP
TXDEN SHDN RXEN RXDO
Positive Input. Connect 0.33µF capacitor between C1-. C1-: Negative Input. Connect 0.33µF capacitor between C1-. CPEN: Level Charge Pump Enable Input. With CPEN held low, charge pump enabled chip operates normally. When CPEN pulled high, charge pump disabled well both drivers, noninverting single-ended receiver, differential receiver. inverting single-ended receiver (RXI) kept alive monitor control line drops 65µA. turn receiver drop 0.5µA, pull SHDN high. TXD: Differential Driver Input (TTL compatible). TXI: Single-Ended Driver Input (TTL compatible). TXDEN: Differential Driver Output Enable (TTL compatible). high level this forces differential driver into three-state; level enables driver. This input does affect single-ended driver. SHDN: Shutdown Input (TTL compatible). When this high, chip shut down. driver receiver outputs three-state, charge pump turns off, supply current drops 0.5µA. level this allows normal operation.
LTC1323CSW
CHARGE PUMP
LTC1323CG
CHARGE PUMP
CPEN
CPEN
TXDEN SHDN RXEN
TXDEN SHDN RXEN
RXD+
RXDO
RXDO
PGND
PGND
RXEN: Receiver Enable (TTL compatible). high level this disables receivers three-states logic outputs; level allows normal operation. RXO: Inverting Single-Ended Receiver Output. Remains active receiver keep-alive mode. RXO: Noninverting Single-Ended Receiver Output. RXDO: Differential Receiver Output. GND: Signal Ground. Connect PGND with 24-pin package. PGND: Power ground connected internally charge pump differential driver. Connect pin. RXD+: Differential Receiver Noninverting Input. When this 200mV above RXD-, RXDO will high; when this 200mV below RXD-, RXDO will low. RXD-: Differential Receiver Inverting Input. RXI: Noninverting Receiver Input. This input controls output. RXI: Inverting Receiver Input. This input controls output. receiver keep-alive mode (CPEN high, SHDN low), this receiver used monitor wake-up control signal.
LTC1323
CTIO
TXO: Single-Ended Driver Output. TXD+: Differential Driver Noninverting Output. TXD-: Differential Driver Inverting Output. VEE: Negative Supply Charge Pump Output. Requires bypass capacitor ground. external load connected pin, bypass capacitor value should increased 4.7µF. Negative Input. Connect 0.33µF capacitor between C2+: Positive Input. Connect 0.33µF capacitor between C2-. VCC: Positive Supply Input. 4.5V 5.5V. Requires bypass capacitor ground.
TEST CIRCUITS
LTC1323
LTC1323
Figure
OUTPUT
LTC1323
Figure
SWITCHI WAVEFOR
tPLH tSKEW tSKEW
LTC1323
1.5V
RXD+
RXD+
RXDO 15pF
LTC1323
Figure
Figure
LTC1323
LTC1323
Figure
Figure
1MHz: 10ns: 10ns
1.5V tPHL
VDIFF V(TXD V(TXD
Figure Differential Driver
LTC1323
SWITCHI WAVEFOR
TXDEN TXD+,
1.5V
LTC1323
Figure Differential Driver Enable Disable
tPHL 1.5V
Figure Differential Driver With Single-Ended Load
tPHL 1.5V
(RXD (RXD -VOD2 tPLH RXDO
1MHz: 10ns: 10ns
1.5V
2.3V OUTPUT NORMALLY OUTPUT NORMALLY HIGH 2.3V 0.5V 0.5V
1MHz: 10ns: 10ns
1.5V tPLH
LTC1323
1MHz: 10ns: 10ns
1.5V tPLH
LTC1323
Figure Single-Ended Driver
1MHz: 10ns: 10ns
tPHL 1.5V
1.5V
LTC1323
Figure Differential Receiver
LTC1323
SWITCHI WAVEFOR
RXI, tPHL
LTC1323
RXEN RXO, RXO, RXDO RXO, RXO, RXDO
LTC1323
APPLICATIO ATIO
Functional Description
"serial port" back Apple-compatible computer peripheral fairly versatile "multi-protocol" connector. must able connect wide bandwidth AppleTalk/LocalTalk network), which requires high speed differential transceiver meet AppleTalk specification, must also able connect directly printer modem through short RS232 style link. LTC1323 designed provide functions necessary implement such port single chip. versions LTC1323 available: 16-pin version which provides minimum solution interfacing AppleTalk network smaller package, larger 24-pin Wide version which additionally includes handshaking lines required implement complete AppleTalk/ modem/printer serial port. LTC1323s from single power supply while providing true single-ended compatibility, include 0.5µA power shutdown mode
1.5V
1MHz: 10ns: 10ns
1.5V tPLH 2.4V
0.8V
1.5V
1.5V
Figure Single-Ended Receiver
1.5V
1MHz: 10ns: 10ns
1.5V
2.3V OUTPUT NORMALLY OUTPUT NORMALLY HIGH 2.3V 0.5V 0.5V
Figure Receiver Enable Disable
improve lifetime battery-powered devices. 24pin Wide version also includes receiver keep-alive mode monitoring external signals while drawing 65µA typically. LTC1323 includes RS422-compatible differential driver/receiver pair data transmission, with driver specified drive into primary typical LocalTalk interface transformer/RFI interference network. Either output differential RS422 driver also single-ended driver, allowing LTC1323 communicate over standard serial connection. 24-pin Wide LTC1323 also includes extra single ended only driver extra RS232-compatible single-ended receivers handshaking lines. versions include onboard charge pump provide regulated supply required single-ended drivers. charge pump also provide 10mA external load current power other circuitry.
LTC1323
APPLICATIO ATIO
Driving Differential AppleTalk Single-Ended Loads differential driver able drive either AppleTalk load single-ended load such printer modem. With differential AppleTalk load, TXD+ will typically swing between 1.2V 3.5V (Figure 14a). With single-ended load such printer, either TXD+ will meet single-ended voltage swing requirement ±3.7V (Figure 14b). automatic switching circuit prevents differential driver from overloading charge pump outputs shorted ground while driving single-ended signals. This allows second single-ended driver continue operate normally when first shorted, allows external circuitry attached charge pump output continue operate even there faults driver outputs.
LTC1323 EXTERNAL CHIP IVEE 4.7µF -5.5V -4.5V IVEE 10mA
LTC1323
Figure
Thermal Shutdown Protection LTC1323 includes thermal shutdown circuit which protects against prolonged shorts driver outputs. driver output shorted another output power supply, current will initially limited maximum 500mA. When temperature rises above 150°C, thermal shutdown circuit disables driver outputs. When cools about 130°C, outputs reenabled. short still exists, part will heat again cycle will repeat. This oscillation occurs about 10Hz prevents part from being damaged excessive power dissipation. When short removed, part will return normal operation.
Power Shutdown power shutdown feature LTC1323 designed battery-powered systems. When SHDN forced high part enters shutdown mode. shutdown supply current typically drops from 2.4mA 0.5µA charge pump turns off, driver receiver outputs three-stated. Receiver Keep-Alive Mode (24-Pin Wide Only) 24-pin Wide version LTC1323 also features power saving receiver keep-alive mode. When CPEN pulled high charge pump turned outputs both drivers, noninverting single-ended receiver differential receiver forced into three-state. inverting single-ended receiver (RXI) kept alive with dropping 65µA receiver delay time increasing maximum 400ns. receiver then used monitor wake-up control signal. Charge Pump Capacitors Supply Bypassing LTC1323 requires external 0.33µF capacitors charge pump operate: from from These capacitors should types should mounted close possible LTC1323. Monolithic ceramic capacitors work well this application. capacitors greater than charge pump pins internal peak currents rise destructive levels. LTC1323 also requires that both well bypassed ensure proper charge pump operation prevent data errors. capacitor from ground adequate. capacitor required from ground should increased 4.7µF external load connected pin. Ceramic tantalum capacitors adequate power supply bypassing; aluminum electrolytic capacitors should only used their enough proper charge pump operation. Inadequate bypass charge pump capacitors will cause charge pump output regulation prematurely, degrading output swing SINGLEENDED driver outputs.
LTC1323
APPLICATIO ATIO
Driving External Load from external load connected between ground shown Figure LTC1323 will sink maximum 10mA while maintaining voltage between 4.5V 5.5V. external load connected, bypass capacitor should increased 4.7µF. Both LTC1323 external chip should have separate bypass capacitors share capacitor. Filter Most LocalTalk applications electromagnetic interference (EMI) filter consisting resistor-capacitor network between each driver receiver connector. Unfortunately, resistors significantly attenuate drivers output signals before they reach cable. Because
LTC1323 EXTERNAL CHIP IVEE 4.7µF -5.5V -4.5V IVEE 10mA
LTC1323
Figure
TYPICAL APPLICATIONS
Typical LocalTalk Connection
0.33µF
LTC1323CS DATA ENABLE SHDN ENABLE DATA
100pF
100pF 100pF 100pF
LTC1323 TA02
Information furnished Linear Technology Corporation believed accurate reliable. However, responsibility assumed use. Linear Technology Corporation makes representation that interconnection circuits described herein will infringe existing patent rights.
LTC1323 uses single supply differential driver, resistor values should reduced guarantee adequate voltage swing cable (Figure 16a). most applications, removing resistors completely does cause increase long shielded connector cable used (Figure 16b). With resistors removed only load primary resistance LocalTalk transformer. This will increase standby current when driver outputs active, does adversely affect drivers because they handle direct indefinite short circuits without damage. Transformer primary resistance should above keep LTC1323 operating normally prevent from entering thermal shutdown. maximum swing immunity, ferrite bead capacitor network used (Figure 16c).
100pF 100pF FERRITE BEAD FERRITE BEAD 100pF
LTC1323
Figure Filters
CHARGE PUMP 0.33µF LocalTalk TRANSFORMER
LTC1323
PACKAGE DESCRIPTION
0.205 0.212** (5.20 5.38)
0.301 0.311 (7.65 7.90) 0.002 0.008 (0.05 0.21)
0.005 0.009 (0.13 0.22)
0.010 0.015 *DIMENSIONS INCLUDE MOLD FLASH. MOLD FLASH (0.25 0.38) SHALL EXCEED 0.006" (0.152mm) SIDE **DIMENSIONS INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL EXCEED 0.010" (0.254mm) SIDE
0.022 0.037 (0.55 0.95)
0.0256 (0.65)
0.010 0.020 (0.254 0.508) 0.008 0.010 (0.203 0.254)
0.053 0.069 (1.346 1.752)
0.016 0.050 0.406 1.270
0.014 0.019 (0.355 0.483)
*DIMENSION DOES INCLUDE MOLD FLASH. MOLD FLASH SHALL EXCEED 0.006" (0.152mm) SIDE **DIMENSION DOES INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL EXCEED 0.010" (0.254mm) SIDE
0.291 0.299** (7.391 7.595) 0.010 0.029 (0.254 0.737) 0.093 0.104 (2.362 2.642) 0.037 0.045 (0.940 1.143)
0.009 0.013 (0.229 0.330)
0.014 0.019 0.016 0.050 (0.356 0.482) (0.406 1.270) NOTE: IDENT, NOTCH CAVITIES BOTTOM PACKAGES MANUFACTURING OPTIONS PART SUPPLIED WITH WITHOUT OPTIONS. *DIMENSION DOES INCLUDE MOLD FLASH. MOLD FLASH SHALL EXCEED 0.006" (0.152mm) SIDE **DIMENSION DOES INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL EXCEED 0.010" (0.254mm) SIDE
NOTE
0.050 (1.270)
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, 95035-7487
(408) 432-1900 FAX: (408) 434-0507 TELEX: 499-3977
Dimensions inches (millimeters) unless otherwise noted. Package 28-Lead Plastic SSOP (0.209)
(LTC 05-08-1640)
0.397 0.407* (10.07 10.33)
0.068 0.078 (1.73 1.99)
SSOP 0694
Package 16-Lead Plastic Small Outline (Narrow 0.150)
(LTC 05-08-1610)
0.386 0.394* (9.804 10.008) 0.004 0.010 (0.101 0.254)
0.050 (1.270)
0.228 0.244 (5.791 6.197)
0.150 0.157** (3.810 3.988)
0695
Package 24-Lead Plastic Small Outline (Wide 0.300)
(LTC 05-08-1620)
0.598 0.614* (15.190 15.600)
NOTE 0.004 0.012 (0.102 0.305)
0.394 0.419 (10.007 10.643)
(WIDE) 0695
LT/GP 1194 PRINTED
LINEAR TECHNOLOGY CORPORATION 1994

DESCRIPTIO Single Chip Provides Complete LocalTalk®/AppleTalk Por

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