DM74ALS240AWM集成电路（IC）的缓冲器驱动器接收器收发器规格书PDF中文资料

General Description

These octal 3-STATE bus drivers are designed to provide the designer with flexibility in implementing a bus interface with memory, microprocessor, or communi cation systems. The output 3-STATE gating control is organized into two separate groups of four buffers. The DM74ALS240A control inputs symmetrically enable the respective outputs when set logic LOW, while the DM74ALS241A has complementary enable gating. 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 DM74LS counterpart

■ Improved switching performance with less power

dissipation compared with the DM74LS counterpart

■ Switching response specified into 500Ω and 50pF load

■ Switching response specifications guaranteed over

full temperature and VCC supply range

■ PNP input design reduces input loading

■ Low level drive current: 74ALS = 24mA