SN74ALS639AN屬于集成電路（IC）的緩沖器驅(qū)動器接收器收發(fā)器。由美國德州儀器公司制造生產(chǎn)的SN74ALS639AN緩沖器，驅(qū)動器，接收器，收發(fā)器邏輯緩沖器、驅(qū)動器、接收器和收發(fā)器允許隔離對某個電路的邏輯信號的訪問，以用于另一電路。緩沖器將其輸入信號（不變或反相）傳遞到其輸出，并可能用于清除弱信號或驅(qū)動負(fù)載。在布爾邏輯仿真器中，緩沖器主要用于增加傳播延遲。邏輯接收器和收發(fā)器允許在數(shù)據(jù)總線之間進(jìn)行隔離通信。

Bidirectional Bus Transceivers in

High-Density 20-Pin Packages

Choice of True or Inverting Logic

A-Bus Outputs Are Open Collector;

B-Bus Outputs Are 3 State

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 open-collector

and 3-state buses. The devices transmit data from the A bus (open-collector) to the B bus (3 state) or from the

B bus to the A bus, depending on the logic level at the direction-control (DIR) input. The output-enable (OE) input

can be used to disable the device so the buses are isolated.

The -1 version of SN74ALS638A is identical to the standard version, except that the recommended maximum

IOL is increased to 48 mA.

The SN74ALS638A, SN74ALS639A, SN74AS638A, and SN74AS639 are characterized for operation from 0°C

to 70°C.