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.