Bidirectional Bus Transceivers in

High-Density 20-Pin Packages

True Logic

3-State Outputs

Package Options Include Plastic

Small-Outline (DW) Packages, Ceramic

Chip Carriers (FK), and Standard Plastic (N)

and Ceramic (J) 300-mil DIPs

description

These octal bus transceivers are designed for

asynchronous two-way communication between

data buses. These devices transmit data from the

A bus to the B bus or from the B bus to the A bus,

depending on the level at the direction-control

(DIR) input. The output-enable (OE) input can be

used to disable the device so that the buses are

effectively isolated.

The -1 version of the SN74ALS645A is identical

to the standard version, except that the

recommended maximum IOL is increased to

48 mA. There is no -1 version of the

SN54ALS645A.

The SN54ALS645A and SN54AS645 are

characterized for operation over the full military

temperature range of –55°C to 125°C. The

SN74ALS645A and SN74AS645 are

characterized for operation from 0°C to 70°C.