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LTC1320

Linear Technology
Part Number LTC1320
Manufacturer Linear Technology
Description AppleTalk Transceiver
Published Mar 22, 2005
Detailed Description LTC1320 AppleTalk© Transceiver U Output Waveforms 5V/DIV 2V/DIV 1k 11 22Ω 10 22Ω 9 14 –5V 22Ω 100pF 22Ω LTC1320 • TA01 ...
Datasheet PDF File LTC1320 PDF File

LTC1320
LTC1320


Overview
LTC1320 AppleTalk© Transceiver U Output Waveforms 5V/DIV 2V/DIV 1k 11 22Ω 10 22Ω 9 14 –5V 22Ω 100pF 22Ω LTC1320 • TA01 FEATURES s s s s DESCRIPTIO s s s s Single Chip Provides Complete LocalTalk©/AppleTalk© Port Low Power: ICC = 1.
2mA Typ Shutdown Pin Reduces ICC to 30µA Typ Drivers Maintain High Impedance in Three-State or with Power Off 30ns Driver Propagation Delay Typ 5ns Driver Skew Typ Thermal Shutdown Protection Drivers are Short-Circuit Protected The LTC1320 is an RS422/RS562 line transceiver designed to operate on LocalTalk networks.
It provides one differential RS422 driver, one single-ended RS562 driver, two single-ended RS562 receivers, and one differential RS422 receiver.
The LTC1320 draws only 1.
2mA quiescent current when active and 30µA in shutdown, making it ideal for use in battery-powered devices and other systems where power consumption is a primary concern.
The LTC1320 drivers are specified to drive ± 2V into 100Ω.
Additionally, the driver outputs three-state when disabled, during shutdown, or when the power is off; they maintain high impedance even with output common-mode voltages beyond the power supply rails.
Both the driver outputs and receiver inputs are protected against ESD damage to beyond 5kV.
The LTC1320 is available in the 18-pin SOL package.
APPLICATI s s s LocalTalk Peripherals Notebook/Palmtop Computers Battery-Powered Systems AppleTalk and LocalTalk are registered trademarks of Apple Computer, Inc.
TYPICAL APPLICATI Typical LocalTalk Connection 5V 18 1 3 5 RX ENABLE DATA OUT SHUTDOWN 8 4 LTC1320 #1 16 22Ω 17 22Ω 22Ω 100pF 22Ω 100pF 1k SIGNALS ON LINE LocalTalk TRANSFORMER DATA IN 120Ω DATA IN TX ENABLE UO UO S 2V/DIV 100pF DATA OUT (REMOTE RECEIVER) 50ns/DIV 5V/DIV 1 LTC1320 ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO TOP VIEW TXD TXI TXDEN SD RXEN RXO RXO RXDO GND 1 2 3 4 5 6 7 8 9 18 VDD 17 TXD – 16 TXD + 15 TXO 14 VSS 13 RXI 12 RXI 11 RXD – 10 RXD+ Supply Voltage (VDD) .
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