3-State Buffer-Type Outputs Drive Bus

Lines Directly

Bus-Structured Pinout

Package Options Include Plastic

Small-Outline (DW) Packages, Ceramic

Chip Carriers (FK), and Plastic (NT) and

Ceramic (JT) DIPs

description

These dual 4-bit D-type latches feature 3-state

outputs designed specifically for bus driving.

These devices are particularly suitable for

implementing buffer registers, I/O ports,

bidirectional bus drivers, and working registers.

The dual 4-bit latches are transparent D-type

latches. While the latch-enable (LE) input is high,

the Q outputs follow the data (D) inputs in true

form, according to the function table. When LE is

low, the outputs are latched. When the clear (CLR)

input goes low, the Q outputs go low

independently of LE. The outputs are in the

high-impedance state when the output-enable

(OE) input is at a high logic level.

The SN54ALS873B and SN54AS873A are

characterized for operation over the full military

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

SN74ALS873B and SN74AS873A are

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