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

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.