SLS SL74LS157D, SL74LS157N Datasheet

Semiconductor

Quad 2-Input Data Selector/Multiplexer

This monolitic data selector/multiplexer contains inverters and
drivers to supply full on-chip data selection to the four output gates. A
separate strobe input is provided. A 4-bit word is selected from one of
two sources and is routed to the four outputs. The LS157 has the same
functions and pin connections as the LS257 but the latter is provided
with 3-state outputs.

• Buffered Inputs and Outputs

• Common Strobe/Select input for all 4 circuits

ORDERING INFORMATION

SL74LS157N Plastic

SL74LS157D SOIC

TA =0° to 70° C for all

SL74LS157

packages

LOGIC DIAGRAM

PIN 16 =VCC

PIN 8 = GND

PIN ASSIGNMENT

FUNCTION TABLE

Inputs Outputs

Output

Enable

H X L

L L A0-A3

Select Y0-Y3

SLS

L H B0-B3

X=don’t care
A0-A3,B0-B3=the levels of the respective
Data-Word Inputs

System Logic

SL74LS157

Semiconductor

MAXIMUM RATINGS*

Symbol Parameter Value Unit

VCC Supply Voltage 7.0 V
VIN Input Voltage 7.0 V

V

Output Voltage 5.5 V

OUT

Tstg Storage Temperature Range -65 to +150 °C

*

Maximum Ratings are those values beyond which damage to the device may occur.

Functional operation should be restricted to the Recommended Operating Conditions.

RECOMMENDED OPERATING CONDITIONS

Symbol Parameter Min Max Unit

VCC Supply Voltage 4.75 5.25 V
VIH High Level Input Voltage 2.0 V

VIL Low Level Input Voltage 0.8 V
IOH High Level Output Current -0.4 mA
IOL Low Level Output Current 8.0 mA

TA Ambient Temperature Range 0 +70 °C

DC ELECTRICAL CHARACTERISTICS over full operating conditions

Guaranteed Limit

Symbol Parameter Test Conditions Min Max Unit

VIK Input Clamp Voltage VCC = min, IIN = -18 mA -1.5 V
VOH High Level Output Voltage VCC = min, IOH = -0.4 mA 2.7 V
VOL Low Level Output Voltage VCC = min, IOL = 4 mA 0.4 V

VCC = min, IOL = 8 mA 0.5

IIH High Level Input Current VCC = max for pins 1,15 40 µA

VIN = 2.7 V A or B input 20
VCC = max for pins 1,15 0.2 mA
VIN = 7.0 V A or B input 0.1

IIL Low Level Input Current VCC = max for pins 1,15 -0.8 mA

VIN = 0.4 V A or B input -0.4

IO Output Short Circuit Current VCC = max, VO = 0 V

(Note 1)

ICC Supply Current VCC = max (Note 2) 16 mA

Note 1: Not more than one output should be shorted at a time, and the duration should not exceed one second.
Note 2: ICC is measured with all outputs open, and 4.5 V applied to all inputs.

-20 -100 mA

System Logic

SLS