DM74157N - Fairchild Semiconductor

August 1986

Revised July 2001

DM74157 Quad 2-Line to 1-Line Data Selectors/Multiplexer

DM74157

Quad 2-Line to 1-Line Data Selectors/Multiplexer

General Description

These data selectors/multiplexers contain inverters and

drivers to supply full on-chip da ta selection to the four out-

put 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.

Applications

• Exp and any data input point

• Multiplex dual data buses

• Gener ate four fun ction s of two va ri ab les ( on e v ari a ble is

common)

• Source programmable counters

Features

■Buffered inputs and outputs

■Typical propagation time 9 ns

■Typical power dissipation 150 mW

Ordering Code:

Connection Diagram

Function Table

H = HIGH Level, L = LO W Level, X = Don’ t Care

Logic Diagram

Order Number Package Number Package Description

DM74157N N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide

Inputs Output Y

Strobe Select A B

HXXXL

LLLXL

LLHXH

LHXLL

LHXHH

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DM74157

Absolute Maximum Ratings(Note 1) Note 1: The “Absolute Maximum Ratings” are thos e values bey ond which

the saf ety of the device cannot be gu aranteed. Th e device shoul d not be

operated at these limits. The parametric values defined in the Electrical

Characteristics tables are not guaranteed at the absolute maximum ratings.

The “R ecomm ended Oper ating Co ndition s” table will def ine the condit ions

for actu al device operation.

Recommended Operating Conditions

Electrical Characteristics

over recommended operating free air temperature range (unless otherwise noted)

Note 2: All typical s are at VCC = 5V, TA = 25°C.

Note 3: Not more than one output should be shorted at a time.

Note 4: ICC is measu red with 4. 5V applie d t o all inputs and all output s OPEN.

Switching Characteri stics

at VCC = 5V and TA = 25°C

Supply Voltage 7V

Input Voltage 5.5V

Operating Free Air Tempe r ature Range 0°C to +70°C

Stora ge Temperature Rang e −65°C to +150°C

Symbol Parameter Min Nom Max Units

VCC Supply Voltage 4.75 5 5.25 V

VIH HIGH Level Input Voltage 2 V

VIL LOW Level Input Voltage 0.8 V

IOH HIGH Level Out put Curr en t −0.8 mA

IOL LOW Level Output Current 16 mA

TAFree Air Operating Temperature 0 70 °C

Symbol Parameter Conditions Min Typ Max Units

(Note 2)

VIInput Clamp Voltage VCC = Min, II = −12 mA −1.5 V

VOH HIGH Level VCC = Min, IOH = Max 2.4 3.4 V

Output Voltage VIL = Max, VIH = Min

VOL LOW Level VCC = Min, IOL = Max 0.4 V

Output Voltage VIH = Min, VIL = Max

IIInput Current @ Max Input Voltage VCC = Max, VI = 5.5V 1 mA

IIH HIGH Level Input Current VCC = Max, VI = 2.4V 40 µA

IIL LOW Level Input Current VCC = Max, VI = 0.4V −1.6 mA

IOS Short Circuit Output Current VCC = Max (Note 3) −18 −55 mA

ICC Supply Current VCC = Max (Note 4) 30 48 mA

Symbol Parameter From (Input) RL = 400Ω, CL = 15 pF Units

To (Output) Min Max

tPLH Propagation Delay Time Data to Y 14 ns

LOW-to-HIGH Level Output

tPHL Propagation Delay Time Data to Y 14 ns

HIGH-to-LOW Level Output

tPLH Propagation Delay Time Strobe to Y 20 ns

LOW-to-HIGH Level Output

tPHL Propagation Delay Time Strobe to Y 21 ns

HIGH-to-LOW Level Output

tPLH Propagation Delay Time Select to Y 23 ns

LOW-to-HIGH Level Output

tPHL Propagation Delay Time Select to Y 27 ns

HIGH-to-LOW Level Output

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DM74157 Quad 2-Line to 1-Line Data Selectors/Multiplexer

Physical Dimensions inches (millimeters) unless otherwise noted

16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide

Package Number N16E

Fairchild does not assume an y responsibility for u se of any circuitry described, no circuit patent license s are implied and

Fairchild reserves the right at any time without notice to change said circuitry and specifications.

LIFE SUPPORT POLICY

FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT

DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD

SEMICONDUCTOR CORPORATION. As used herein:

1. Life suppor t de vices o r syst ems are dev ic es or syste ms

which, (a) are intended for surgical implant into the

body, or (b) support or sustain life, and (c) whose failure

to perform when properly used in accordance with

instruct ions fo r use pr ovi de d in the l abe ling, can be rea-

sonably expected to result in a significant injury to the

user.

2. A crit ical componen t in any com ponen t of a life s uppor t

device or system whose failure to perform can be rea-

sonabl y e xpec ted to cause th e fa i lure of the l ife s upport

device or system, or to affect its safety or effectiveness.