Fairchild Semiconductor 74ACT158SJX, 74ACT158SJ, 74ACT158SCX, 74ACT158SC, 74ACT158PC Datasheet

© 1999 Fairchild Semiconductor Corporation DS009930 www.fairchildsemi.com

November 1988
Revised November 1999

74ACT158 Quad 2-Input Multiplexer

74ACT158
Quad 2-Input Multiplexer

General Description

The ACT158 is a high-sp eed 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 ACT158
can also be used as a function generator.

Features

■ ICC reduced by 50%

■ Outputs source/sink 24 mA

■ TTL-compatible inputs

Ordering Code:

Device also available in Tape and Reel. Specify by appending su ffix le tter “X” to the ordering code.

Logic Symbols

IEE/IEC

Connection Diagram

Pin Descriptions

FACT is a trademark of Fairchild Semiconductor Corporation.

Order Number Package Number Package Description

74ACT158SC M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150” Narrow Body
74ACT158PC M16D 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
74ACT158MTC MTC16 16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
74ACT158SJ N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide

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

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74ACT158

Functional Description

The ACT158 quad 2 -input multiplexer selects four bits of
data from two sources under the control of a common
Select input (S) and pr esents the data in invert ed form at
the four outputs. The Enable input (E

) is active-LOW. When

E

is HIGH, all of the outputs (Z) are force d HIGH regard­less of all other i np uts. Th e ACT 15 8 is th e l o gic im pl em en ­tation of a 4-pole, 2-position switch where the position of
the switch is determined by the logi c levels supplied t o the
Select input.

A common use of the ACT1 58 is the moving of dat a from
two groups of registers to four common output busses. The
particular r egi s ter f r om wh i ch t h e da t a co me s is d et erm i n ed
by the state of the Select input. A less obvious use is as a
function generator. The ACT 158 can generate four func­tions of two variables with one variable common. This is
useful for implementing gating functions.

Tr uth Table

H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial

Logic Diagram

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

Inputs Outputs

E

SI0I

1

Z

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

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74ACT158

Absolute Maximum Ratings(Note 1) Recommended Operating

Conditions

Note 1: Absolute max imum ratings are those values beyond w hich damage

to the device may occu r. The databook spe cificatio ns shou ld be met, wit h­out exception, to ensure that the system de sign is relia ble over its p ower
supply, temperature, and output/input loading variable. Fairchild does not
recommend operation of FACT circuits outside databook specifications.

DC Electrical Characteristics

Note 2: All outputs loaded; thres holds on input associate d w it h output under test.
Note 3: Maximum test duration 2.0 ms, one output loaded at a time.

Supply Voltage (VCC) −0.5V to +7.0V
DC Input Diode Current (I

IK

)

V

I

= −0.5V −20 mA

V

I

= VCC + 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

= VCC + 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

) 140°C

Supply Voltage (V

CC

) 4.5V to 5.5V

Input Voltage (V

I

)0V to V

CC

Output Voltage (VO)0V to V

CC

Operating Temperature (TA) −40°C to +85°C
Minimum Input Edge Rate (∆V/∆t)

V

IN

from 0.8V to 2.0V

V

CC

@ 4.5V, 5.5V 125 mV/ns

Symbol Parameter

V

CC

TA = +25°C TA = −40°C to +85°C

Units Conditions

(V) Typ Guaranteed Limits

V

IH

Minimum HIGH Level 4.5 1.5 2.0 2.0

V

V

OUT

= 0.1V

Input Voltage 5.5 1.5 2.0 2.0 or VCC − 0.1V

V

IL

Maximum LOW Level 4.5 1.5 0.8 0.8

V

V

OUT

= 0.1V

Input Voltage 5.5 1.5 0.8 0.8 or VCC − 0.1V

V

OH

Minimum HIGH Level 4.5 4.49 4.4 4.4

VI

OUT

= −50 µA

Output Voltage 5.5 5.49 5.4 5.4

VIN = V

IL

or V

IH

4.5 3.86 3.76 V IOH = −24 mA

5.5 4.86 4.76 IOH = −24 mA (Note 2)

V

OL

Maximum LOW Level 4.5 0.001 0.1 0.1

VI

OUT

= 50 µA

Output Voltage 5.5 0.001 0.1 0.1

VIN = VIL or V

IH

4.5 0.36 0.44 V IOL = 24 mA

5.5 0.36 0.44 I

OL

= 24 mA (Note 2)

I

IN

Maximum Input

5.5 ±0.1 ±1.0 µAVI = VCC, GND

Leakage Current

I

CCT

Maximum

5.5 0.6 1.5 mA VI = VCC − 2.1V

ICC/Input

I

OLD

Minimum Dynamic 5.5 75 mA V

OLD

= 1.65V Max

I

OHD

Output Current (Note 3) 5.5 −75 mA V

OHD

= 3.85V Min

I

CC

Maximum Quiescent

5.5 4.0 40.0 µA

VIN = V

CC

Supply Current or GND