SN74ALS1640A, SN74ALS1645A
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS

SDAS246B - DECEMBER 1982 - REVISED FEBRUARY 1997

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers there to appears at the end of this data sheet.

features

• Bidirectional Bus Transceivers in High-Density 20-Pin Packages
• Lower-Power Versions of SN74ALS640B and SN74ALS645A
• Package Options Include Plastic Small-Outline (DW) Packages and Standard Plastic (N) 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 () input can be used to disable the device so that the buses are effectively isolated. The SN74ALS1640A features inverting logic, while the SN74ALS1645A features noninverting logic.

The SN74ALS1640A and SN74ALS1645A are characterized for operation from 0°C to 70°C.