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LT1389 AppleTalk(R) Peripheral Interface Transceiver
June 1995
FEATURES
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DESCRIPTION
The LT(R)1389 is a complete AppleTalk DCE interface transceiver. The circuit includes one differential driver, one differential receiver, two high speed single-ended drivers and one RS232/RS562 receiver. Logic inputs provide driver and receiver three-state modes and a low power shutdown control. The differential driver may be used as an additional single-ended driver, supporting RS562 output levels. The high speed single-ended driver and differential driver support data clock rates to 1Mbaud, allowing direct connect operation with all Macintosh peripheral devices. The Transmit and Receive Enable controls provide flexible operating mode control for sharing data lines between multiple circuits. The LT1389 is available in 18-lead PDIP and SO Wide packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
AppleTalk and LocalTalk are registered trademarks of Apple Computer, Inc.
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Provides Complete AppleTalk DCE Interface Supports Direct Connect or LocalTalk(R) Transmit Enable Controls Three-State Driver Outputs Flow-Through Architecture for Easy PC Layout Rugged Bipolar Design Thermal Shutdown Protection Outputs Assume a High Impedance State when Off or Powered Down Short-Circuit Protection on All Outputs
APPLICATIONS
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Printers Modems Local Area Networks
TYPICAL APPLICATION
Typical LocalTalk Application
1 2 16 RD OUT 4 15 18 VDD 18 5V 17 16
RXEN
LT1389
ON/OFF 5V
120 RFI RFI 1k 1k 1k 1k
RFI RFI
VSS 14 -5V
TD IN TXEN VEE -5V
7 8 9
12 11
RFI RFI 120 RFI 11 10 8 9 RXD OUT
RFI 10 VCC 5V
22 RFI =
22 100pF
Specifications on this data sheet are preliminary only, and subject to change without notice. Contact the manufacturer before finalizing a design using this part.
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LTC1320
1
TXD
3 4 5
TXDEN SD = 0V RXEN
1389 TA01
1
LT1389
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PACKAGE/ORDER INFORMATION
TOP VIEW RXEN GND RS OUT RD OUT TS IN TS IN TD IN TXEN VEE 1 2 3 4 5 6 7 8 9 N PACKAGE 18-LEAD PDIP SW PACKAGE 18-LEAD PLASTIC SO WIDE
TJMAX = 150C, JA = 100C/ W (N) TJMAX = 150C, JA = 100C/ W (SW)
Supply Voltage VCC ........................................................................ 6V VEE ...................................................................... - 6V Input Voltage Driver ..................................................... - 0.2V to 6V TXEN, RXEN, ON/OFF ............................. - 0.2V to 6V Single-Ended Receiver........................... - 30V to 30V Differential Receiver ................................ - 7V to 12V Output Voltage Driver .......................................... - 30V to VCC + 12V Receiver .................................... - 0.3V to VCC + 0.3V Short-Circuit Duration Driver Output .............................................. Indefinite Receiver Output .......................................... Indefinite Operating Temperature Range .................... 0C to 70C Storage Temperature Range ................. - 65C to 150C Lead Temperature (Soldering, 10 sec).................. 300C
18 17 16 15 14 13 12 11 10
ON/OFF RS IN RD+ RD- TS OUT TS OUT TD OUT - TD OUT + VCC
ORDER PART NUMBER LT1389CN LT1389CSW
Consult factory for Industrial and Military grade parts.
ELECTRICAL CHARACTERISTICS
PARAMETER Supply Current Supply Current in Shutdown Logic Input Thresholds ( TXEN, ON/OFF, TS IN, TD IN) Differential/Single-Ended Driver Differential Output Voltage, VOD VCC VEE VCC VEE
0C TA 70C
MIN TYP 8 3 MAX 15 5 10 10 0.8 1.4 1.4 8 3 3 4.2 - 4.0 2.0 10 UNITS mA mA A A V V V V V V V V A A mA mA mA ns ns ns s s
CONDITIONS VON/OFF = 5V VON/OFF = 0V Input Low Level Input High Level No Load (Figure 1) RL = 100 RL = 50 RL = 100 (Figure 1) Output High, RL = 3k (Figure 2) Output Low, RL = 3k 0V VIN 5V VTXEN = 2V, - 5V VOUT 5V ISC+ ISC-, VOUT = 5V ISC-, VOUT = 0V RL = 100
7 2 1.5 2.0 3.7 - 10 - 100 35 - 200 - 20
Output Common-Mode Voltage, VOC Single-Ended Output Voltage Input Current Output Leakage Current Output Short-Circuit Current
3.0 - 3.7 10 100 150 - 35 -8 40 40 40 75 75 75 2 2
Differential Mode Propagation Delay Driver Disable Delay Driver Enable Delay Single-Ended Output Fall Time Single-Ended Output Rise Time
RL = 3k, CL = 2500pF, VOUT = 3V to - 3V RL = 3k, CL = 2500pF, VOUT = - 3V to 3V
1 1
2
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LT1389
ELECTRICAL CHARACTERISTICS
PARAMETER Differential Receiver Differential Input Voltage Thresholds Receiver Input Hysteresis Input Resistance Input Common-Mode Voltage Output Voltage Output Short-Circuit Current Propagation Delay Single-Ended Receiver Input Voltage Threshold Hysteresis Input Resistance Output Voltage Output Short-Circuit Current Propagation Delay Single-Ended Drivers Output Voltage Logic Input Current Output Leakage Current Output Short-Circuit Current Slew Rate Propagation Delay Driver Disable Delay Driver Enable Delay
0C TA 70C
MIN - 0.2 70 12 -7 12 4.0 0.2 - 10 10 40 0.4 20 70 TYP MAX 0.2 UNITS V mV k V V V mA mA ns V V V k V V mA mA ns ns V V A A mA mA V/s 100 75 100 ns ns ns
CONDITIONS - 7V VCM 12V - 7V VCM 12V
Output High, IOUT = 160A Output Low, IOUT = - 1.6mA Sinking Current, VOUT = VCC Sourcing Current, VOUT = 0V
2.4 - 20
Input Low Threshold Input High Threshold - 5V VIN 5V Output Low, IOUT = -1.6mA Output High, IOUT = 160mA (VCC = 5V) Sinking Current, VOUT = VCC Sourcing Current, VOUT = 0V Output Transition High to Low, tHL Output Transition Low to High, tLH Output High, RL = 3k Output Low, RL = 3k Shutdown or Driver Disable Modes Sinking Current, VOUT = 0V Sourcing Current, VOUT = 0V
0.8 0.1 3 3.5 - 20
1.3 1.7 0.4 5 0.2 4.2 - 10 10 250 350
2.4 1.0 7 0.4
20 600 600
3.7 - 10 - 100 - 40 60
4.0 - 4.4
- 3.7 10 100
- 10 50 100 60 40 60
Note 1: Absolute maximum ratings are those values beyond which the life of the device may be impaired. Note 2: Unless otherwise specified, testing done at VCC = 5V, VEE = - 5V and VTXEN = 0V. Outputs and single-ended receiver inputs are open. Driver inputs are tied to VCC. Differential receiver input RD - is biased at 2.6V, RD + at 2.4V.
Note 3: For driver delay measurements, RL = 3k and CL = 51pF. Trigger points are set between the driver's input logic threshold and the output transition to the zero crossing. (tHL = tLH = 1.4V to 0V) Note 4: For receiver delay measurements, CL = 51pF. Trigger points are set between the receiver's input logic threshold and the output transition to standard TTL/CMOS logic threshold. (tHL = 1.3V to 2.4V and t LH = 1.7V to 0.8V)
PIN FUNCTIONS
RXEN (Pin 1): Receiver Enable Control. An open pin or a logic low allows normal operation of the receivers. A logic high causes receiver outputs to become high impedance, allowing sharing of the receiver output data lines. GND (Pin 2): Ground Pin. RS OUT (Pin 3): Single-Ended Receiver Output with TTL/ CMOS Voltage Levels. The output is fully short-circuit protected to GND or VCC.
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LT1389
PIN FUNCTIONS
RD OUT (Pin 4): Differential Receiver Output Pin with TTL/ CMOS Voltage Levels. The output is fully short-circuit protected to GND or VCC. TS IN (Pins 5, 6): Single-Ended Driver Input Pins. These inputs are TTL/CMOS compatible. An input logic low causes a driver output high. Tie unused inputs to GND. TD IN (Pin 7): Differential Driver Input Pin. A TTL/CMOS compatible logic input. A logic high causes driver output RD+ to swing high and RD- low. Tie input to VCC when not in use. TXEN (Pin 8): A TTL/CMOS logic high places the driver outputs into a high impedance state. A logic low fully enables the transmit capabilities. Transitions occur at data rate speeds to facilitate data line multiplexing. VEE: (Pin 9): - 5V Input Supply Pin. This pin should be decoupled with a 0.1F ceramic capacitor. VCC (Pin 10): 5V Input Supply Pin. This pin should be decoupled with a 0.1F ceramic capacitor. TD OUT +, TD OUT - (Pins 11, 12): Differential Driver Output Pins. Outputs drive 100 differential loads to RS422 levels, and are also capable of supplying RS562 levels to single-ended loads greater than 3k. Outputs are in a high impedance state when TXEN is high or VCC = 0V. Outputs are fully short-circuit protected from VOUT = VEE + 20V to VOUT = VCC - 20V. Applying higher voltages will not damage the device if the overdrive is moderately current limited. TS OUT (Pins 13, 14): Single-Ended Driver Outputs at RS562 Voltage Levels. Outputs are in a high impedance state when TXEN is high or VCC = 0V. Outputs are fully short-circuit protected from VOUT = VEE + 20V to VOUT = VCC - 20V. Applying higher voltage will not damage the device if the overdrive is moderately current limited. RD-, RD+ (Pins 15, 16): Differential Receiver Input Pins. Common-mode input range is -7V to 12V. Receiver inputs have 50mV of hysteresis for noise immunity. RS IN (Pin 17): Single-Ended Receiver Input. This pin accepts RS232 or RS562 level signals (30V) into a protected 5k terminating resistor. The receiver input provides 0.4V of hysteresis for noise immunity. Data rates to 120kbaud are supported. ON/OFF (Pin 18): A logic low level on this pin shuts down the circuit. All receiver and driver outputs are high impedance. A logic high allows normal operation of the circuit.
TEST CIRCUITS
TXD- VOD TXD+ RL /2 VOC RL /2
Figure 1. Differential Output Test Circuit
RELATED PARTS
PART NUMBER LTC1320 LTC1334 LTC1337 LTC1345 LTC1348 DESCRIPTION Appletalk Transceiver RS232/RS485 Multi-Protocol Transceiver 5V 3-Driver/5-Receiver Micropower RS232 Transceiver V.35 Differential Transceiver 3.3V 3-Driver/5-Receiver RS232 Transceiver COMMENTS Complete DTE Port Appletalk Compatible 500A Quiescent Current Low Power V.35 Solution True RS232 from 3.3V Supplies
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Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7487
(408) 432-1900 q FAX: (408) 434-0507 q TELEX: 499-3977
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TXD- TXD+ RL CL
RL
CL
1389 F02
1389 F01
Figure 2. Single-Ended Output Test Circuit
LT/GP 0695 6K * PRINTED IN USA
(c) LINEAR TECHNOLOGY CORPORATION 1995

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