CD74HCT259中文资料高速 CMOS 逻辑 8 位可寻址锁存器数据手册TI规格书

描述 Description

The ’HC259 and ’HCT259 Addressable Latch features the low-power consumption associated with CMOS circuitry and has speeds comparable to low-power Schottky.

This latches three active modes and one reset mode. When both the Latch Enable (LE\\) and Master Reset (MR\\) inputs are low (8-line Demultiplexer mode) the output of the addressed latch follows the Data input and all other outputs are forced low. When both MR\\ and LE\\ are high (Memory Mode), all outputs are isolated from the Data input, i.e., all latches hold the last data presented before the LE\\ transition from low to high. A condition of LE\\ low and MR\\ high (Addressable Latch mode) allows the addressed latch’s output to follow the data input; all other latches are unaffected. The Reset mode (all outputs low) results when LE\\ is high and MR\\ is low.

特性 Features

• Buffered Inputs and Outputs
• Typical Propagation Delay of 15ns at VCC = 5V, CL = 15pF, TA = 25°C
• Wide Operating Temperature Range... –55°C to 125°C
• Significant Power Reduction Compared to LSTTL Logic ICs
• HCT Types - 4.5V to 5.5V Operation - Direct LSTTL Input Logic Compatibility, VIL = 0.8V (Max), VIH = 2V (Min) - CMOS Input Compatibility, Il 1µA at VOL, VOH
Data sheet acquired from Harris Semiconductor