74157中文资料

TL F 655054157 DM54157 DM74157 Quad 2-Line to 1-Line Data Selectors Multiplexers

June1989 54157 DM54157 DM74157

Quad2-Line to1-Line Data Selectors Multiplexers

General Description

These data selectors multiplexers contain inverters and

drivers to supply full on-chip data selection to the four out-

put gates A separate strobe input is provided A4-bit word

is selected from one of two sources and is routed to the four

outputs

Applications

Y Expand any data input point

Y Multiplex dual data buses

Y Generate four functions of two variables(one variable

is common)

Y Source programmable counters

Features

Y Buffered inputs and outputs

Y Typical propagation time9ns

Y Typical power dissipation150mW

Y Alternate Military Aerospace device(54157)is avail-

able Contact a National Semiconductor Sales Office

Distributor for specifications

Connection Diagram

Dual-In-Line Package

TL F 6550–1

Order Number54157DMQB 54157FMQB DM54157J DM54157W or DM74157N

See NS Package Number J16A N16E or W16A

Function Table

Inputs

Output Y

Strobe Select A B

H X X X L

L L L X L

L L H X H

L H X L L

L H X H H

H e High Level L e Low Level X e Don’t Care

C1995National Semiconductor Corporation RRD-B30M105 Printed in U S A

Absolute Maximum Ratings(Note)

If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications Supply Voltage7V Input Voltage5 5V Operating Free Air Temperature Range

DM54and54b55 C to a125 C DM740 C to a70 C Storage Temperature Range b65 C to a150 C Note The‘‘Absolute Maximum Ratings’’are those values beyond which the safety of the device cannot be guaran-teed The device should not be operated at these limits The parametric values defined in the‘‘Electrical Characteristics’’table are not guaranteed at the absolute maximum ratings The‘‘Recommended Operating Conditions’’table will define the conditions for actual device operation

Recommended Operating Conditions

Symbol Parameter

DM54157DM74157

Units Min Nom Max Min Nom Max

V CC Supply Voltage4 555 54 7555 25V V IH High Level Input Voltage22V V IL Low Level Input Voltage0 80 8V I OH High Level Output Current b0 8b0 8mA I OL Low Level Output Current1616mA T A Free Air Operating Temperature b55125070 C

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

Symbol Parameter Conditions Min

Typ

Max Units (Note1)

V I Input Clamp Voltage V CC e Min I I e b12mA b1 5V

V OH High Level Output V CC e Min I OH e Max

2 4

3 4V

Voltage V IL e Max V IH e Min

V OL Low Level Output V CC e Min I OL e Max

0 4V

Voltage V IH e Min V IL e Max

I I Input Current Max V CC e Max V I e5 5V

1mA Input Voltage

I IH High Level Input Current V CC e Max V I e2 4V40m A

I IL Low Level Input Current V CC e Max V I e0 4V b1 6mA

I OS Short Circuit V CC e Max DM54b20b55

mA Output Current(Note2)DM74b18b55

I CC Supply Current V CC e Max(Note3)3048mA Note1 All typicals are at V CC e5V T A e25 C

Note2 Not more than one output should be shorted at a time

Note3 I CC is measured with4 5V applied to all inputs and all outputs open

2

Switching Characteristics at V CC e5V and T A e25 C(See Section1for Test Waveforms and Output Load)

Symbol Parameter From(Input)R L e400X C L e15pF

Units To(Output)Min Max

t PLH Propagation Delay Time Data

14ns Low to High Level Output to Y

t PHL Propagation Delay Time Data

14ns High to Low Level Output to Y

t PLH Propagation Delay Time Strobe

20ns Low to High Level Output to Y

t PHL Propagation Delay Time Strobe

21ns High to Low Level Output to Y

t PLH Propagation Delay Time Select

23ns Low to High Level Output to Y

t PHL Propagation Delay Time Select

27ns High to Low Level Output to Y

Logic Diagram

157

TL F 6550–2

3

4

Physical Dimensions inches(millimeters)

16-Lead Ceramic Dual-In-Line Package(J)

Order Number54157W or DM54157J

NS Package Number J16A

16-Lead Molded Dual-In-Line Package(N)

Order Number DM74157N

NS Package Number N16E

5

54157 D M 54157 D M 74157Q u a d 2-L i n e t o 1-L i n e D a t a S e l e c t o r s M u l t i p l e x e r s

Physical Dimensions inches (millimeters)(Continued)

16-Lead Ceramic Flat Package (W)Order Number 54157FMQB or DM54157W

NS Package Number W16A

LIFE SUPPORT POLICY

NATIONAL’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 NATIONAL SEMICONDUCTOR CORPORATION As used herein 1 Life support devices or systems are devices or 2 A critical component is any component of a life systems which (a)are intended for surgical implant support device or system whose failure to perform can into the body or (b)support or sustain life and whose be reasonably expected to cause the failure of the life failure to perform when properly used in accordance support device or system or to affect its safety or with instructions for use provided in the labeling can effectiveness

be reasonably expected to result in a significant injury to the user

National Semiconductor National Semiconductor National Semiconductor National Semiconductor Corporation

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