74HCT20 查看數據表（PDF） - Philips Electronics

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74HCT20

Dual 4-input NAND gate

Philips Electronics 

Philips Semiconductors

Dual 4-input NAND gate

Product specification

74HC/HCT20

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

0.3

AC CHARACTERISTICS FOR 74HCT

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

Tamb (°C)

TEST CONDITIONS

SYMBOL

PARAMETER

74HCT

+25

−40 to +85

−40 to +125

UNIT

VCC

(V)

WAVEFORMS

min. typ. max. min. max. min. max.

tPHL/ tPLH propagation delay

16 28

35

42 ns 4.5 Fig.7

nA, nB, nC, nD to nY

tTHL/ tTLH output transition time

7 15

19

22 ns 4.5 Fig.7

AC WAVEFORMS

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

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

Fig.7 Waveforms showing the enable 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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