The CD74HC377 is an octal D-type flip-flops with a buffered clock (CP) common to all eight flip-flops. All the flip- flops are loaded simultaneously on the positive edge of the clock (CP) when the Data Enable (E) is Low.
This document is a datasheet for the CD54HC377, CD74HC377, CD54HCT377, and CD74HCT377 integrated circuits. These devices are high-speed CMOS logic octal D-type flip-flops featuring a buffered common clock input that loads all eight flip-flops simultaneously on the positive edge of the clock when the Data Enable (E) is Low.
The datasheet provides detailed electrical specifications for both HC types (operating from 2V to 6V) and HCT types (compatible with LSTTL inputs, operating from 4.5V to 5.5V). It includes absolute maximum ratings, DC electrical characteristics such as input/output voltages and leakage currents, switching parameters like propagation delay and clock frequency limits, and thermal information for various package types including CERDIP, PDIP, SOIC, and TSSOP.
| Supply Voltage Range (HC Types) | 2V to 6V |
|---|---|
| Supply Voltage Range (HCT Types) | 4.5V to 5.5V |
| Typical Propagation Delay (HC Types, CL=15pF) | 14ns |
| Typical Propagation Delay (HCT Types, CL=15pF) | 16 ns |
| Fanout over Temperature Range | 10 LSTTL Loads |
| Maximum Clock Frequency (HCT Types, Vcc=4.5V) | 25 MHz |
| Input Capacitance (CL = 50pF) | 10 pF |
The flip-flops are loaded simultaneously on the positive edge of the clock (CP) when the Data Enable (E) is Low.
Yes, HCT types have direct LSTTL input logic compatibility.