74HCT21 查看數據表（PDF） - Philips Electronics

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74HCT21

Dual 4-input AND gate

Philips Electronics 

Philips Semiconductors

Dual 4-input AND gate

Product specification

74HC/HCT21

FEATURES

• Output capability: standard

• ICC category: SSI

GENERAL DESCRIPTION

The 74HC/HCT21 are high-speed Si-gate CMOS devices

and are pin compatible with low power Schottky TTL

(LSTTL). They are specified in compliance with JEDEC

standard no. 7A.

The 74HC/HCT21 provide the 4-input AND function.

QUICK REFERENCE DATA

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

SYMBOL PARAMETER

tPHL/ tPLH

CI

CPD

propagation delay nA, nB, nC, nD to nY

input capacitance

power dissipation capacitance per package

CONDITIONS

TYPICAL

HC

HCT

CL = 15 pF; VCC = 5 V 10

12

3.5

3.5

notes 1 and 2

15

16

Notes

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

PD = CPD × VCC2 × fi + ∑ (CL × VCC2 × fO) where:

fi = input frequency in MHz

fo = output frequency in MHz

CL = output load capacitance in pF

VCC = supply voltage in V

∑ (CL × VCC2 × fo) = sum of outputs

2. For HC the condition is VI = GND to VCC

For HCT the condition is VI = GND to VCC − 1.5 V

UNIT

ns

pF

pF

ORDERING INFORMATION

See “74HC/HCT/HCU/HCMOS Logic Package Information”.

December 1990

2

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