74HCT253 datasheet(6/7 Pages) PHILIPS

Part #	74HCT253

Description	Dual 4-input multiplexer; 3-state

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Manufacturer	PHILIPS [NXP Semiconductors]

Direct Link	http://www.nxp.com

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December 1990

6

Philips Semiconductors

Product speciﬁcation

Dual 4-input multiplexer; 3-state

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 (

∆I

CC) 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.

AC CHARACTERISTICS FOR 74HCT

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

INPUT

UNIT LOAD COEFFICIENT

1In

2In

nOE

S0

S1

0.40

1.10

SYMBOL PARAMETER

Tamb (°C)

UNIT

TEST CONDITIONS

74HCT

VCC

(V)

WAVEFORMS

+25

−40 to +85 −40 to +125

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

nOE to nY

14

30

38

45

ns

4.5

Fig.7

tPHZ/ tPLZ

3-state output disable time

nOE to nY

13

30

38

45

ns

4.5

Fig.7

tTHL/ tTLH

output transition time

5

12

15

18

ns

4.5

Fig.6

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