# SN75LBC771 GEOPORT TRANSCEIVER

## Overview
The SN75LBC771 is a low-power LinBiCMOS device incorporating drivers and receivers for a 9-pin GeoPort host interface. It supports data transmission up to 4 Mbit/s full duplex, replacing RS-232, AppleTalk, and printer ports. Compatible with both LocalTalk and AppleTalk.

## Key Features
️· Interface: 9-pin GeoPort host interface
️· Data Rate: Up to 4 Mbit/s full duplex
️· Compatibility: Replaces RS-232, AppleTalk, printer ports; compatible with LocalTalk and AppleTalk.
️· Technology: LinBiCMOS process
️· Hot-Plug Capability

## Electrical Characteristics
️· Supply Voltage: VCC: 4.75 – 5.25 V, VEE: -5.25 – -4.75 V
️· Input Voltage (VIH): 2 V
️· Output Voltage (VOH/VOL): Varies with load, typically 3.6-4.5V / -3.6 to -2 V
️· ESD Protection: Class 3 (6kV/500V)
️· Operating Temperature: 0°C to 70°C

## Functional Description

️· Drivers: Hybrid EIA/TIA-422-B and EIA/TIA-423-B drivers
️· Receivers: Hybrid EIA/TIA-422-B and EIA/TIA-423-B receivers
️· Fail-Safe Mechanisms: Ensure high output state when inputs are open.
️· Shutdown (SHDN): High impedance state when SHDN is high.
️· Driver Enable (DEN): High impedance state when DEN is high.

## Pin Configuration (Refer to datasheet for diagram)
️· Provides a 9-pin DW (R-PDSO-G**) package.

## Absolute Maximum Ratings
️· Positive Supply Voltage: -0.5 to 7 V
️· Negative Supply Voltage: -7 to 0.5 V
️· Operating Temperature: 0°C to 70°C
️· Storage Temperature: -65°C to 150°C

## Testing and Performance
️· Propagation Delay (tPHL/tPLH): ~40-75 ns
️· Rise/Fall Time (tr/tf): ~10-30 ns