74HCT253 查看數據表（PDF） - Philips Electronics

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74HCT253

Dual 4-input multiplexer; 3-state

Philips Electronics 

Philips Semiconductors

Dual 4-input multiplexer; 3-state

Product specification

74HC/HCT253

DC CHARACTERISTICS FOR 74HCT

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

Output capability: bus driver

ICC category: MSI

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

1In

2In

nOE

S0

S1

UNIT LOAD COEFFICIENT

0.40

0.40

1.10

1.10

1.10

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

1In to nY;

2In to nY

20 38

48

57 ns 4.5 Fig.6

tPHL/ tPLH propagation delay

Sn to nY

22 40

50

60 ns 4.5 Fig.6

tPZH/ tPZL 3-state output enable time

14 30

38

45 ns 4.5 Fig.7

nOE to nY

tPHZ/ tPLZ 3-state output disable time

13 30

38

45 ns 4.5 Fig.7

nOE to nY

tTHL/ tTLH output transition time

5 12

15

18 ns 4.5 Fig.6

December 1990

6

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