Motorola SN54LS158J, SN74LS158D, SN74LS158N Datasheet

QUAD 2-INPUT MULTIPLEXER

The LSTTL/MSI SN54L/74LS158 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 LS158 can also generate any four of the 16 different functions of two variables. The LS158 is fabricated with the Schottky barrier diode process for high speed and is completely compatible with all Motorola TTL families.

•Schottky Process for High Speed

•Multifunction Capability

•Inverted Outputs

•Input Clamp Diodes Limit High Speed Termination Effects

•ESD > 3500 Volts

•Special Circuitry Ensures Glitch Free Multiplexing

CONNECTION DIAGRAM DIP (TOP VIEW)

VCC

E

I0c

I1c

Zc

I0d

I1d

Zd

16

15

14

13

12

11

10

9

NOTE:

The Flatpak version

has the same pinouts

(Connection Diagram) as

the Dual In-Line Package.

1

2

3

4

5

6

7

8

S

I0a

I1a

Za

I0b

I1b

Zb

GND

PIN NAMES

LOADING (Note a)

HIGH

LOW

S

Common Select Input

1.0

U.L.

0.5

U.L.

E

Enable (Active LOW) Input

1.0

U.L.

0.5

U.L.

I0a ± I0d

Data Inputs from Source 0

0.5

U.L.

0.25

U.L.

I1a ± I

1d

Data Inputs from Source 1

0.5

U.L.

0.25

U.L.

Za ± Zd

Inverted Outputs (Note b)

10

U.L.

5 (2.5)

U.L.

NOTES:

a)1 TTL Unit Load (U.L.) = 40 μA HIGH/1.6 mA LOW.

b)The Output LOW drive factor is 2.5 U.L. for Military (54) and 5 U.L. for Commercial (74) Temperature Ranges.

LOGIC DIAGRAM

	I0a	I1a	I0b	I1b	I0c	I1c	I0d		I1d	E S
2	3	5	6		14	13	11	10	15	1

VCC = PIN 16

GND = PIN 8

4	7	12	9	= PIN NUMBERS
Za		Zb	Zc	Zd

SN54/74LS158

QUAD 2-INPUT MULTIPLEXER

LOW POWER SCHOTTKY

			J SUFFIX
			CERAMIC
			CASE 620-09
16	1
			N SUFFIX
			PLASTIC
16			CASE 648-08
	1
			D SUFFIX
	16		SOIC
			CASE 751B-03
		1

ORDERING INFORMATION

SN54LSXXXJ Ceramic

SN74LSXXXN Plastic

SN74LSXXXD SOIC

LOGIC SYMBOL

		15		2		3	5		6		14		13		11		10
		E		I0a I1a I0b					I1b I0c I1c						I0d I1d
1		S		Za			Zb				Zc				Zd
				4			7				12				9
							VCC = PIN 16
							GND		=		PIN		8

FAST AND LS TTL DATA

5-273

SN54/74LS158

FUNCTIONAL DESCRIPTION

The LS158 is a Quad 2-input Multiplexer fabricated with the Schottky barrier diode process for high speed. It 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 LS158 is the logic implementation of a 4-pole, 2-position switch where the position of the switch is deter-

mined by the logic levels supplied to the Select Input.

A common use of the LS158 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 LS158 can generate four functions of two variables with one variable common. This is useful for implementing gating functions.

TRUTH TABLE

	SELECT
ENABLE	INPUT	INPUTS		OUTPUT
E	S	I0	I1	Z
H	X	X	X	H
L	L	L	X	H
L	L	H	X	L
L	H	X	L	H
L	H	X	H	L

H = HIGH Voltage Level

L = LOW Voltage Level

X = Don't Care

GUARANTEED OPERATING RANGES

Symbol	Parameter		Min	Typ	Max	Unit
VCC	Supply Voltage	54	4.5	5.0	5.5	V
		74	4.75	5.0	5.25
TA	Operating Ambient Temperature Range	54	± 55	25	125	°C
		74	0	25	70
IOH	Output Current Ð High	54, 74			± 0.4	mA
IOL	Output Current Ð Low	54			4.0	mA
		74			8.0

FAST AND LS TTL DATA

5-274