CD74HCT259EE4集成电路（IC）的锁存器规格书PDF中文资料

CD74HCT259EE4属于集成电路（IC）的锁存器。由德州仪器制造生产的CD74HCT259EE4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。

1 Features

• Buffered inputs and outputs

• Four operating modes

• Typical propagation delay of 15ns at VCC = 5V, CL

= 15pF, TA = 25oC

• Fanout (over temperature range)

– Standard Outputs: 10 LSTTL loads

– Bus driver outputs: 15 LSTTL loads

• Wide operating temperature range: -55oC to 125oC

• Balanced propagation delay and transition times

• Significant power reduction compared to LSTTL

logic ICs

• HC types

– 2 V to 6 V operation

– High noise immunity: NIL = 30%, NIH = 30% of

VCC at VCC = 5 V

• HCT types

– 4.5 V to 5.5 V operation

– Direct LSTTL input logic compatability, VIL = 0.8

V (max), VIH = 2 V (min)

– CMOS input compatibility, II ≤ 1μA at VOL, VOH

2 Description

The CDx4HC(T)259 is an 8-bit addressable latch with

three active modes of operation (addressable latch,

memory, 8-line demultiplexer) and one reset mode.