74ALS244中文资料仙童半导体数据手册PDF规格书

General Description

This octal 3-STATE bus driver is designed to provide the designer with flexibility in implementing a bus interface with memory, microprocessor, or communication systems. This device offers 64-extended temperature Grade product guaranteeing performance from −40°C to +85°C. The output 3-STATE gating control is organized into two separate groups of four buffers, and both control inputs enable the respective outputs when set logic LOW. The 3-STATE circuitry contains a feature that maintains the buffer outputs in 3-STATE (high impedance state) during power supply ramp-up or ramp-down. This eliminates bus glitching problems that arise during power-up and power-down.

特性 Features

■ Advanced low power oxide-isolated ion-implanted

Schottky TTL process

■ Functional and pin compatible with the 74LS counterpart

■ Improved switching performance with less power dissipation

compared with the 74LS counterpart

■ Switching response specified into 500Ω and 50 pF load

■ Switching response specifications guaranteed over full

temperature and VCC supply range

■ PNP input design reduces input loading