74HC74DB datasheet(2/22 Pages) PHILIPS

2 / 22 page

2003 Jul 10

Philips Semiconductors

Product speciﬁcation

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

positive-edge trigger

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 =6ns

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.

SYMBOL

PARAMETER

CONDITIONS

TYPICAL

UNIT

HCT

tPHL/tPLH

propagation delay

CL = 15 pF; VCC =5V

nCP to nQ, nQ14

nSD to nQ, nQ15

nRD to nQ, nQ16

fmax

maximum clock frequency

MHz

input capacitance

3.5

CPD

power dissipation capacitance per ﬂip-ﬂop

notes 1 and 2

74HC74DB датащи(PDF) 2 Page - NXP Semiconductors

74HC74DB датащи(HTML) 2 Page - NXP Semiconductors

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22

датащи скачать

ссылки URL