MC74HCT573A集成电路（IC）的锁存器规格书PDF中文资料

MC74HCT573A属于集成电路（IC）的锁存器。由安森美半导体公司制造生产的MC74HCT573A锁存器锁存器是类似于触发器的基本数字存储设备，但是不同之处在于，在锁存使能（或类似命名）信号处于有效逻辑状态的任何时间，保持的逻辑状态都可以改变。“透明”锁存器还允许设备输出在锁存使能信号有效时反映输入的当前状态，而相反的是，状态仅在保持状态已固定时改变。

Octal 3-State Noninverting Transparent Latch with LSTTL Compatible Inputs

High−Performance Silicon−Gate CMOS

The MC74HCT573A is identical in pinout to the LS573. This device may be used as a level converter for interfacing TTL or NMOS outputs to High−Speed CMOS inputs.

These latches appear transparent to data (i.e., the outputs change asynchronously) when Latch Enable is high. When Latch Enable goes low, data meeting the setup and hold times becomes latched.

The Output Enable input does not affect the state of the latches, but when Output Enable is high, all device outputs are forced to the high−impedance state. Thus, data may be latched even when the outputs are not enabled.

The HCT573A is identical in function to the HCT373A but has the Data Inputs on the opposite side of the package from the outputs to facilitate PC board layout.

特性 Features

• Output Drive Capability: 15 LSTTL Loads

• TTL/NMOS−Compatible Input Levels

• Outputs Directly Interface to CMOS, NMOS and TTL

• Operating Voltage Range: 4.5 to 5.5 V

• Low Input Current: 10 μA

• In Compliance with the Requirements Defined by JEDEC Standard No. 7 A

• Chip Complexity: 234 FETs or 58.5 Equivalent Gates

♦ Improved Propagation Delays

♦ 50 Lower Quiescent Power

• These Devices are Pb−Free and are RoHS Compliant