MOTOROLA

SEMICONDUCTOR TECHNICAL DATA

1

REV 7

2/97

Quad 2-Input Data

Selectors/Multiplexers

High–Performance Silicon–Gate CMOS

The MC54/74HC157A is identical in pinout to the LS157. The device

inputs are compatible with standard CMOS outputs; with pullup resistors,

they are compatible with LSTTL outputs.

This device routes 2 nibbles (A or B) to a single port (Y) as determined by

the Select input. The data is presented at the outputs in noninverted form. A

high level on the Output Enable input sets all four Y outputs to a low level.

The HC157A is similar in function to the HC257 which has 3–state outputs.

• Output Drive Capability: 10 LSTTL Loads

• Outputs Directly Interface to CMOS, NMOS, and TTL

• Operating Voltage Range: 2.0 to 6.0 V

• Low Input Current: 1.0 µA

• High Noise Immunity Characteristic of CMOS Devices

• In Compliance with the Requirements Defined by JEDEC Standard

No. 7A

• Chip Complexity: 82 FETs or 20.5 Equivalent Gates

LOGIC DIAGRAM

2

5

11

14

3

6

10

13

4

7

9

12

1

15

A0

A1

A2

A3

B0

B1

B2

B3

Y0

Y1

Y2

Y3

SELECT

OUTPUT

ENABLE

DATA

OUTPUTS

NIBBLE

A INPUTS

NIBBLE

B INPUTS

PIN 16 = VCC

PIN 8 = GND

MC54/74HC157A

FUNCTION TABLE

PIN ASSIGNMENT

Inputs

Output

Outputs

Enable

Select

Y0 – Y3

X = don’t care

A0 – A3, B0 – B3 = the levels

of the respective Data–Word

Inputs.

13

14

15

16

9

10

11

12

5

4

3

2

1

8

7

6

SELECT

Y0

B0

A0

Y1

B1

A1

GND

Y3

B3

A3

OUTPUT

ENABLE

VCC

B2

A2

Y2

H

L

L

X

L

H

L

A0 – A3

B0 – B3

D SUFFIX

SOIC PACKAGE

CASE 751B–05

N SUFFIX

PLASTIC PACKAGE

CASE 648–08

ORDERING INFORMATION

MC54HCXXXAJ

MC74HCXXXAN

MC74HCXXXAD

MC74HCXXXADT

Ceramic

Plastic

SOIC

TSSOP

1

16

1

16

1

16

DT SUFFIX

TSSOP PACKAGE

CASE 948F–01

J SUFFIX

CERAMIC PACKAGE

CASE 620–10

1

16