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Suitable for IEEE Standard 488-1978 (GPIB)

8-Channel Bidirectional Transceivers

Designed to Implement Control Bus

Interface

Designed for Single Controller

High-Speed Advanced Low-Power Schottky

Circuitry

Low Power Dissipation . . . 46 mW Max Per

Channel

Fast Propagation Times . . . 20 ns Max

High-Impedance pnp Inputs

Receiver Hysteresis . . . 650 mV Typ

Bus-Terminating Resistors Provided on

Driver Outputs

No Loading of Bus When Device Is

Powered Down (VCC = 0)

Power-Up/Power-Down Protection

(Glitch Free)

description/ordering information

The SN75ALS161 eight-channel

general-purpose interface bus transceivers are

high-speed, advanced low-power

Schottky-process devices designed to provide the

bus-management and data-transfer signals between operating units of a single-controller instrumentation

system. When combined with the SN75ALS160 octal bus transceivers, this device provides a complete 16-wire

interface for the IEEE 488 bus.

The SN75ALS161 device features eight driver-receiver pairs connected in a front-to-back configuration to form

input/output (I/O) ports at both the bus and terminal sides. The direction of data through these driver-receiver

pairs is determined by the direction-control (DC) and talk-enable (TE) signals.

The driver outputs general-purpose interface bus (GPIB I/O ports) feature active bus-terminating resistor

circuits designed to provide a high impedance to the bus when VCC = 0. The drivers are designed to handle

sink-current loads up to 48 mA. Each receiver features pnp transistor inputs for high input impedance and

hysteresis of 400 mV on the commercial part, and 250 mV on the military part, minimum, for increased noise

immunity. All receivers have 3-state outputs, to present a high impedance to the terminal when disabled.

The SN75ALS161 is characterized for operation from 0°C to 70°C.