NSC 5962-8875501FA, 5962-88755012A, 5962-8875501EA Datasheet

54AC158•54ACT158
Quad 2-Input Multiplexer

General Description

The ’AC/’ACT158 is a high-speed quad 2-input multiplexer.It
selects four bits of data from two sources using the common
Select and Enable inputs. The four buffered outputs present
the selected data in the inverted form. The ’AC/’ACT158 can
also be used as a function generator.

Features

n ICCreduced by 50

%

n Outputs source/sink 24 mA
n ’ACT158 has TTL-compatible inputs
n Standard Microcircuit Drawing (SMD)

— ’AC158: 5962-89729
— ’ACT158: 5962-88755

Logic Symbols Connection Diagrams

Pin Names Description

I

0a–I0d

Source 0 Data Inputs

I

1a–I1d

Source 1 Data Inputs

E

Enable Input
S Select Input
Z

a–Zd

Inverted Outputs

FACT™is a trademark ofFairchild Semiconductor Corporation.

DS100273-1

IEE/IEC

DS100273-2

Pin Assignment

for DIP and Flatpak

DS100273-3

Pin Assignment

for LCC

DS100273-4

July 1998

54AC58

•

54ACT158 Quad 2-Input Multiplexer

© 1998 National Semiconductor Corporation DS100273 www.national.com

Functional Description

The ’AC/’ACT158 quad 2-input multiplexer selects four bits
of data from two sources under the control of a common Se­lect input (S) and presents the data in inverted form at the
four outputs. The Enable input (E) is active-LOW. When E is
HIGH, all of the outputs (Z) are forced HIGH regardless of all
other inputs. The ’AC/’ACT158 is the logic implementation of
a 4-pole, 2-position switch where the position of the switch is
determined by the logic levels supplied to the Select input.

A common use of the ’AC/’ACT158 is the moving of data
from two groups of registers to four common output busses.
The particular register from which the data comes is deter­mined by the state of the Select input. A less obvious use is
as a function generator. The ’AC/’ACT158 can generate four
functions of two variables with one variable common. This is
useful for implementing gating functions.

Truth Table

Inputs Outputs

E

SI

0

I

1

Z

HX X X H
LL L X H
LLH X L
LH X L H
LH X H L

H

=

HIGH Voltage Level
L=LOW Voltage Level
X=Immaterial

Logic Diagram

DS100273-5

Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.

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Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.

Supply Voltage (V

CC

) −0.5V to +7.0V

DC Input Diode Current (I

IK

)

V

I

=

−0.5V −20 mA

V

I

=

V

CC

+ 0.5V +20 mA

DC Input Voltage (V

I

) −0.5V to VCC+ 0.5V

DC Output Diode Current (I

OK

)

V

O

=

−0.5V −20 mA

V

O

=

V

CC

+ 0.5V +20 mA

DC Output Voltage (V

O

) −0.5V to VCC+ 0.5V

DC Output Source

or Sink Current (I

O

)

±

50 mA

DC V

CC

or Ground Current

per Output Pin (I

CC

or I

GND

)

±

50 mA

Storage Temperature (T

STG

) −65˚C to +150˚C

Junction Temperature (T

J

)

CDIP 175˚C

Recommended Operating
Conditions

Supply Voltage (VCC)

’AC 2.0V to 6.0V
’ACT 4.5V to 5.5V

Input Voltage (V

I

) 0VtoV

CC

Output Voltage (VO) 0VtoV

CC

Operating Temperature (TA)

54AC/ACT −55˚C to +125˚C

Minimum Input Edge Rate (∆V/∆t)

’AC Devices
V

IN

from 30%to 70%of V

CC

V

CC

@

3.3V, 4.5V, 5.5V 125 mV/ns

Minimum Input Edge Rate (∆V/∆t)

’ACT Devices
V

IN

from 0.8V to 2.0V

V

CC

@

4.5V, 5.5V 125 mV/ns

Note 1: Absolute maximum ratings are those values beyond which damage
to the device may occur. The databook specifications should be met, without
exception, to ensure that the system design is reliable over its power supply,
temperature, and output/input loading variables. National does not recom­mend operation of FACT

™

circuits outside databook specifications.

DC Characteristics for ’AC Family Devices

54AC

Symbol Parameter V

CC

T

A

=

Units Conditions

(V) −55˚C to +125˚C

Guaranteed

Limits

V

IH

Minimum High Level 3.0 2.1 V

OUT

=

0.1V

Input Voltage 4.5 3.15 V or V

CC

− 0.1V

5.5 3.85

V

IL

Maximum Low Level 3.0 0.9 V

OUT

=

0.1V

Input Voltage 4.5 1.35 V or V

CC

− 0.1V

5.5 1.65

V

OH

Minimum High Level 3.0 2.9 I

OUT

=

−50 µA

Output Voltage 4.5 4.4 V

5.5 5.4
(Note 2)

V

IN

=

V

IL

or V

IH

3.0 2.4 IOH= −12 mA

4.5 3.7 V I

OH

= −24 mA

5.5 4.7 I

OH

= −24 mA

V

OL

Maximum Low Level 3.0 0.1 I

OUT

=

50 µA

Output Voltage 4.5 0.1 V

5.5 0.1
(Note 2)

V

IN

=

V

IL

or V

IH

3.0 0.50 IOL=12mA

4.5 0.50 V I

OL

=24mA

5.5 0.50 I

OL

=24mA

I

IN

Maximum Input 5.5

±

1.0 µA V

I

=

V

CC

, GND

Leakage Current

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