LTC1320 Datasheet | Linear Technology

LTC1320 Apple Talk© Transceiver Output Waveforms 5V/DIV 2V/DIV 1k 11 22Ω 10 22Ω 9 14 - 5V 22Ω 100p F 22Ω - TA01 Features s s s s DESCRIPTIO s s s s Single Chip Provides plete Local Talk©/Apple Talk© Port Low Power: ICC = 1.2m A 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 Local Talk 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 1.2m A 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 mon-mode voltages beyond the power supply rails. Both the driver outputs and receiver inputs are protected against ESD damage to beyond 5k V. The LTC1320 is available in the 18-pin SOL package. APPLICATI s s s Local Talk Peripherals Notebook/Palmtop puters Battery-Powered Systems Apple Talk and Local Talk are registered trademarks of Apple puter, Inc. TYPICAL APPLICATI Typical Local Talk Connection 5V 18 1 3 5 RX ENABLE DATA OUT SHUTDOWN 8 4 LTC1320 #1 16 22Ω 17 22Ω 22Ω 100p F 22Ω 100p F 1k SIGNALS ON LINE Local Talk TRANSFORMER DATA IN 120Ω DATA IN TX ENABLE 2V/DIV 100p F DATA OUT (REMOTE RECEIVER) 50ns/DIV 5V/DIV 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) .....................................