74HC251DB datasheet(6/7 Pages) PHILIPS

6 / 7 page

December 1990

Philips Semiconductors

Product speciﬁcation

8-input multiplexer; 3-state

74HC/HCT251

DC CHARACTERISTICS FOR 74HCT

For the DC characteristics see

“74HC/HCT/HCU/HCMOS Logic Family Specifications”.

Output capability: standard

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 HCT

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

INPUT

UNIT LOAD COEFFICIENT

S1,S2

1.00

1.50

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

In to Y

4.5

Fig.6

tPHL/ tPLH

propagation delay

In to Y

4.5

Fig.7

tPHL/ tPLH

propagation delay

Sn to Y

4.5

Fig.6

tPHL/ tPLH

propagation delay

Sn to Y

4.5

Fig.7

tPZH/ tPZL

3-state output enable time

OE to Y, Y

4.5

Fig.7

tPHZ/ tPLZ

3-state output disable time

OE to Y, Y

4.5

Fig.7

tTHL/ tTLH

output transition time

4.5

Figs 6 and 7

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