74HCT74 データシートの表示（PDF） - Philips Electronics

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74HCT74

Dual D-type flip-flop with set and reset; positive-edge trigger

Philips Electronics 

Philips Semiconductors

Dual D-type flip-flop with set and reset;

positive-edge trigger

Product specification

74HC74; 74HCT74

FEATURES

• Wide supply voltage range from 2.0 to 6.0 V

• Symmetrical output impedance

• High noise immunity

• Low power dissipation

• Balanced propagation delays

• ESD protection:

HBM EIA/JESD22-A114-A exceeds 2000 V

MM EIA/JESD22-A115-A exceeds 200 V.

GENERAL DESCRIPTION

The 74HC/HCT74 is a high-speed Si-gate CMOS device

and is pin compatible with low power Schottky TTL

(LSTTL). They are specified in compliance with JEDEC

standard no. 7A.

The 74HC/HCT74 are dual positive-edge triggered, D-type

flip-flops with individual data (D) inputs, clock (CP) inputs,

set (SD) and reset (RD) inputs; also complementary

Q and Q outputs.

The set and reset are asynchronous active LOW inputs

and operate independently of the clock input. Information

on the data input is transferred to the Q output on the

LOW-to-HIGH transition of the clock pulse. The D inputs

must be stable one set-up time prior to the LOW-to-HIGH

clock transition for predictable operation.

Schmitt-trigger action in the clock input makes the circuit

highly tolerant to slower clock rise and fall times.

QUICK REFERENCE DATA

GND = 0 V; Tamb = 25 °C; tr = tf = 6 ns

SYMBOL

PARAMETER

CONDITIONS

tPHL/tPLH

fmax

CI

CPD

propagation delay

nCP to nQ, nQ

nSD to nQ, nQ

nRD to nQ, nQ

maximum clock frequency

input capacitance

power dissipation capacitance per flip-flop

CL = 15 pF; VCC = 5 V

notes 1 and 2

Notes

1. CPD is used to determine the dynamic power dissipation (PD in µW).

PD = CPD × VCC2 × fi × N + Σ(CL × VCC2 × fo) where:

fi = input frequency in MHz;

fo = output frequency in MHz;

CL = output load capacitance in pF;

VCC = supply voltage in Volts;

N = total load switching outputs;

Σ(CL × VCC2 × fo) = sum of the outputs.

2. For 74HC74 the condition is VI = GND to VCC.

For 74HCT74 the condition is VI = GND to VCC − 1.5 V.

TYPICAL

HC

HCT

UNIT

14

15

ns

15

18

ns

16

18

ns

76

59

MHz

3.5

3.5

pF

24

29

pF

2003 Jul 10

2

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