74HC_HCT251

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© NXP Semiconductors N.V. 2016. All rights reserved.

Product data sheet

Rev. 4 — 1 February 2016

4 of 18

NXP Semiconductors

74HC251; 74HCT251

8-input multiplexer; 3-state

6.

Functional description

[1]

H = HIGH voltage level; L = LOW voltage level; X = don’t care; Z = high-impedance OFF-state.

7.

Limiting values

[1]

For SO16 package: Ptot derates linearly with 8 mW/K above 70 C.

[2]

For SSOP16 and TSSOP16 packages: Ptot derates linearly with 5.5 mW/K above 60 C.

Table 3.

Function table[1]

Input

Output

OE

S2

S1

S0

I0

I1

I2

I3

I4

I5

I6

I7

Y

Y

H

X

XXX

XXX

XXX

XZ

Z

L

L

L

L

L

XXX

XXX

XH

L

L

L

L

L

H

XXX

XXX

XL

H

L

L

L

H

X

L

XX

XXX

XH

L

L

L

L

H

X

H

XX

XXX

XL

H

L

L

H

L

X

XL

X

XXX

XH

L

L

L

H

L

X

XH

X

XXX

XL

H

L

L

H

H

X

XXL

XXX

XH

L

L

L

H

H

X

XXH

XXX

XL

H

LH

LLX

X

X

X

LX

X

X

H

L

LH

LLX

X

X

X

H

X

X

X

LH

L

H

L

H

X

XXX

XL

X

XH

L

LH

LH

X

X

X

X

X

H

X

X

LH

L

H

H

L

X

XXX

XXL

XH

L

L

H

H

L

X

XXX

XXH

XL

H

L

H

H

H

X

XXX

XXX

L

H

L

L

H

H

H

X

XXX

XXX

H

L

H

Table 4.

Limiting values

In accordance with the Absolute Maximum Rating System (IEC 60134). Voltages are referenced to GND (ground = 0 V).

Symbol

Parameter

Conditions

Min

Max

Unit

VCC

supply voltage

0.5

+7

V

IIK

input clamping current

VI < 0.5 V or VI >VCC +0.5 V

-

20

mA

IOK

output clamping current

VO < 0.5 V or VO >VCC +0.5 V

-

20

mA

IO

output current

VO = 0.5 V to (VCC +0.5 V)

-

25

mA

ICC

supply current

-

+50

mA

IGND

ground current

50

-

mA

Tstg

storage temperature

65

+150

C

Ptot

total power dissipation

Tamb = 40 C to +125 C

SO16 package

[1]

-

500

mW

(T)SSOP16 package

[2]

-

500

mW