特性 Features

? Buffered Positive Edge Triggered Clock

? Asynchronous Common Reset

? 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

- 2V to 6V Operation

- High Noise Immunity: NIL = 30%, NIH = 30% of VCC

at VCC = 5V

? 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

描述 Description

The ’HC174 and ’HCT174 are edge triggered flip-flops which

utilize silicon gate CMOS circuitry to implement D-type flipflops.

They possess low power and speeds comparable to low

power Schottky TTL circuits. The devices contain six masterslave

flip-flops with a common clock and common reset.

Data on the D input having the specified setup and hold

times is transferred to the Q output on the low to high

transition of the CLOCK input. The MR input, when low, sets

all outputs to a low state.

Each output can drive ten low power Schottky TTL

equivalent loads. The ’HCT174 is functional as well as, pin

compatible to the ’LS174.