SN75LBC771

Features:

Supports a 9-Pin GeoPort Host Interface
    Standard for the Intelligent Network Port
 Designed to Operate up to 4-Mbit/s Full
    Duplex
±5 V Supply Operation
Provides 6 kV ESD Protection
Has Driver Short-Circuit Protection
Includes Failsafe Mechanism for Open
    Inputs
Is Backward Compatible with AppleTalk
    and LocalTalk
Combines Multiple Components into a
    Single Chip Solution
Complements the SN75LBC772 9-Pin
    GeoPort Peripheral (DCE) Interface Device
Uses LinBiCMOS Process Technology


Pinout




Specifications

Positive supply voltage range, V_CC (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . 0.5 to 7 V
Negative supply voltage range, V_EE (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . .  7 to 0.5 V
Receiver input voltage range (RA, RB) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 V to 15 V
Receiver differential input voltage range, V_ID . . . . . . . . . . . . . . . . . . . . . . . . . . 12V to 12 V
Receiver output voltage range (RY) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5 V to 5.5 V
Driver output voltage range (Power Off) (,DY1, DY2, DZ2) . . . . . . . . . . . . . . . . 15 V to 15 V
Driver output voltage range (Power On) (,DY1, DY2, DZ2) . . . . . . . . . . . . . . . . 11 V to 11 V
Driver input voltage range (DA, SHDN, ,DEN) . . . . . . . . . . . . . . . . . . . . 0.5 V to VCC +0.4 V
Electrostatic Discharge (see Note 2)
                                             (All pins) Class 3, A . . . . . . . . . . . . . . . . . . . . . . . . . .          6 kV
                                             (All pins) Class 3, B . . . . . . . . . . . . . . . . . . . . . . . . . .        500 V
Continuous total power dissipation . . . . . . . . . . . . . . . . . . . . . .See Dissipation Rating Table
Operating free-air temperature range, T_A . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0°C to 70°C
Storage temperature range, T_stg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65°C to 150°C
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds . . . . . . . . . . .           260°C

Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

NOTES:
1. All voltage values are with respect to network ground terminal unless otherwise noted.
2. This rating is per MIL-STD-883C, Method 3015.7.

Description

The SN75LBC771 is a low-power LinBiCMOS device that incorporates the drivers and receivers for a 9-pin GeoPort host interface. GeoPort combines hybrid EIA/TIA-422-B and EIA/TIA-423-B drivers and receivers to transmit data up to four-Mbit/s full duplex. GeoPort is a serial communications standard that is intended to replace the RS-232, AppleTalk, and printer ports all in one connector in addition to providing real-time data transfer capability. The SN75LBC771 provides point-to-point connections between GeoPort-compatible devices with data transmission rates up to 4-Mbit/s full duplex featuring a hot-plug capability. Applications include connection to telephone, ISDN, digital sound and imaging, fax-data modems, and other
traditional serial and parallel connections. The GeoPort is backwardly compatible to both LocalTalk and AppleTalk.

While the SN75LBC771 is powered off (V_CC and V_EE = 0), the outputs are in a high-impedance state. Also, when the shutdown (SHDN) terminal is high, all outputs go into a high-impedance state. A logic high on the driver enable (,DEN)) terminal places the outputs of the differential driver into a high-impedance state. All drivers and receivers have fail-safe mechanisms that ensure a high output state when the inputs are left open.The SN75LBC771 is characterized for operation over the 0°C to 70°C temperature range.