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

DC CHARACTERISTICS FOR 74HCT

For the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications”.

Output capability: standard

ICC category: SSI

Note to HCT types

The value of additional quiescent supply current (∆ICC) for a unit load of 1 is given in the family specifications.

To determine ∆ICC per input, multiply this value by the unit load coefficient shown in the table below.

INPUT

nA, nB,

nC, nD

UNIT LOAD COEFFICIENT

1.50

1.50

AC CHARACTERISTICS FOR 74HCT

GND = 0 V; tr = tf = 6 ns; CL = 50 pF

Tamb (°C)

TEST CONDITIONS

SYMBOL PARAMETER

min.

74HCT

+25

−40 to+85

typ. max. min. max.

−40 to+125

UNIT

VCC

(V)

min. max.

WAVEFORMS

tPHL/ tPLH propagation delay

15 27

34

nA, nB nC, nD to nY

41 ns 4.5 Fig.6

tTHL/ tTLH output transition time

7 15

19

22 ns 4.5 Fig.6

AC WAVEFORMS

(1) HC: VM = 50%; VI = GND to VCC.

HCT: VM = 1.3 V; VI = GND to 3 V.

Fig.6 Waveforms showing the input (nA, nB, nC, nD) to output (nY) propagation delays and the output transition

times.

PACKAGE OUTLINES

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

December 1990

6

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