Texas Instruments CD74HCT157E, CD74HCT158E, CD74HCT157M96, CD74HCT157M, CD74HC158M Datasheet

1

Data sheet acquired from Harris Semiconductor
SCHS153

Features

• Common Select Inputs

• Separate Enable Inputs

• Buffered inputs and Outputs

• Fanout (Over Temperature Range)

- Standard Outputs. . . . . . . . . . . . . . . 10 LSTTL Loads

- Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads

• Wide Operating Temperature Range . . . -55

o

C to 125oC

• Balanced Propagation Delay and Transition Times

• Significant Power Reduction Compared to LSTTL
Logic ICs

• HC Types

- 2V to 6V Operation

- High NoiseImmunity: N

IL

= 30%, NIH= 30%of VCCat

V

CC

= 5V

• HCT Types

- 4.5V to 5.5V Operation

- Direct LSTTL Input Logic Compatibility,

V

IL

= 0.8V (Max), VIH = 2V (Min)

- CMOS Input Compatibility, I

l

≤ 1µA at VOL, V

OH

Pinout

CD74HC157, CD74HCT157, CD74HC158, CD74HCT158

(PDIP, SOIC)

TOP VIEW

14

15

16

9

13
12
11
10

1
2
3
4
5

7

6

8

S

1I

0

1I

1

1Y

2I

0

2I

1

GND

2Y

V

CC

4I

0

4I

1

4Y
3I

0

3I

1

3Y

E

September 1997

CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.
Copyright

© Harris Corporation 1997

File Number 1642.2

CD74HC157, CD74HCT157,

CD74HC158, CD74HCT158

High Speed CMOS Logic

Quad 2-Input Multiplexers

[ /Title
(CD74H
C157,
CD74H
CT157,
CD74H
C158,
CD74H
CT158)
/

Subject
(High
Speed

2

Description

The Harris CD74HC157, CD74HCT157, CD74HC158 and
CD74HCT158 are quad 2-input multiplexers which select
four bits of data from two sources under the control of a
common Select input (S). The Enable input (

E) is active Low.

When (

E) is High, all of the outputs in the 158, the inverting

type, (

1Y-4Y) are forced High and in the 157, the non-

inverting type, all of the outputs (

1Y-4Y) are forced Low,

regardless of all other input conditions.
Moving data from two groups of registers to four common

output busses is a common use of these devices. The state
of the Select input determines the particular register from
which the data comes. They can also be used as function
generators.

Ordering Information

PART NUMBER TEMP. RANGE (oC) PACKAGE

PKG.

NO.

CD74HC157E -55 to 125 16 Ld PDIP E16.3
CD74HCT157E -55 to 125 16 Ld PDIP E16.3
CD74HC158E -55 to 125 16 Ld PDIP E16.3
CD74HCT158E -55 to 125 16 Ld PDIP E16.3
CD74HC157M -55 to 125 16 Ld SOIC M16.15
CD74HCT157M -55 to 125 16 Ld SOIC M16.15
CD74HC158M -55 to 125 16 Ld SOIC M16.15

NOTES:

1. When ordering, use the entire part number. Add the suffix 96 to
obtain the variant in the tape and reel.

2. Wafer ordiefor this partnumberis available whichmeets all elec­trical specifications. Please contact your local sales office or
Harris customer service for ordering information.

CD74HC157, CD74HCT157, CD74HC158, CD74HCT158

3

Functional Diagram

TRUTH TABLE

ENABLE

SELECT

INPUT DATA INPUTS

OUTPUT

157 158

E S I0 I1 Y Y

HXXXLH
LLLXLH
LLHXHL
LHXLLH
LHXHHL

NOTE: H = High Voltage Level, L = Low Voltage Level, X = Don’t Care

2

3

5
6

10

13

14

11

4

7

12

9

4Y

3Y

2Y

1Y

1Y

4Y

3Y

2Y

HC/HCT

157

HC/HCT

158

1I

0

1I

1

2I

0

2I

1

3I

0

3I

1

4I

0

4I

1

S
E

115

CD74HC157, CD74HCT157, CD74HC158, CD74HCT158