SN74ALS639A中文资料八路总线收发器数据手册TI规格书

描述 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 () 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.
 
 

特性 Features

• 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) Packagesand Standard Plastic (N) 300-mil DIPs

简介

SN74ALS639A属于集成电路（IC）的缓冲器驱动器接收器收发器。由TI制造生产的SN74ALS639A缓冲器，驱动器，接收器，收发器逻辑缓冲器、驱动器、接收器和收发器允许隔离对某个电路的逻辑信号的访问，以用于另一电路。缓冲器将其输入信号（不变或反相）传递到其输出，并可能用于清除弱信号或驱动负载。在布尔逻辑仿真器中，缓冲器主要用于增加传播延迟。逻辑接收器和收发器允许在数据总线之间进行隔离通信。