Features
• Buffered Common Clock
• Buffered Inputs
• Typical Propagation Delay at CL = 15pF,
VCC = 5V, TA = 25oC
- 14 ns (HC Types
- 16 ns (HCT Types)
• 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 ’HC377 and ’HCT377 are octal D-type flip-flops with a
buffered clock (CP) common to all eight flip-flops. All the flipflops
are loaded simultaneously on the positive edge of the
clock (CP) when the Data Enable (E) is Low.