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MC74HC251ADR2G

8-Input Data Selector/Multiplexer with 3-State Outputs

ON Semiconductor 

MC74HC251A

D0 4

D1 3

D2 2

5Y

DATA

INPUTS

D3 1

D4 15

D5 14

6Y

D6 13

D7 12

ADDRESS

INPUTS

A0 11

A1 10

A2 9

OUTPUT ENABLE 7

PIN 16 = VCC

PIN 8 = GND

Figure 1. Logic Diagram

DATA

OUTPUTS

FUNCTION TABLE

Inputs

Output

A2

A1

A0

Enabled

X

X

X

H

L

L

L

L

L

L

H

L

L

H

L

L

L

H

H

L

H

L

L

L

H

L

H

L

H

H

L

L

H

H

H

L

Z = high impedance

D0, D1, …, D7 = the level of the respective

D input.

Outputs

Y

Y

Z

Z

D0

D0

D1

D1

D2

D2

D3

D3

D4

D4

D5

D5

D6

D6

D7

D7

MAXIMUM RATINGS

Symbol

Parameter

Value

Unit

VCC DC Supply Voltage (Referenced to GND)

−0.5 to + 7.0

V

Vin DC Input Voltage (Referenced to GND)

−1.5 to VCC + 1.5 V

Vout DC Output Voltage (Referenced to GND)

−0.5 to VCC + 0.5 V

Iin

DC Input Current, per Pin

±25

mA

Iout DC Output Current, per Pin

±50

mA

ICC DC Supply Current, VCC and GND Pins

±75

mA

PD Power Dissipation in Still Air

SOIC Package

500

mW

TSSOP Package

TBD

Tstg Storage Temperature

−65 to + 150

°C

Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of

these limits are exceeded, device functionality should not be assumed, damage may occur and

reliability may be affected.

RECOMMENDED OPERATING CONDITIONS

Symbol

Parameter

Min Max Unit

VCC DC Supply Voltage (Referenced to GND)

2.0 6.0 V

Vin, Vout DC Input Voltage, Output Voltage (Referenced to GND)

0

VCC

V

TA

Operating Temperature, All Package Types

−55 +125 °C

tr, tf

Input Rise and Fall Time

(Figure 2)

VCC = 2.0 V 0

VCC = 4.5 V 0

VCC = 6.0 V 0

1000 ns

500

400

Functional operation above the stresses listed in the Recommended Operating Ranges is not

implied. Extended exposure to stresses beyond the Recommended Operating Ranges limits may

affect device reliability.

This device contains protection

circuitry to guard against damage

due to high static voltages or electric

fields. However, precautions must

be taken to avoid applications of any

voltage higher than maximum rated

voltages to this high−impedance cir-

cuit. For proper operation, Vin and

Vout should be constrained to the

range GND v (Vin or Vout) v VCC.

Unused inputs must always be

tied to an appropriate logic voltage

level (e.g., either GND or VCC).

Unused outputs must be left open.

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