Motorola SN54LS242J, SN54LS243J, SN74LS242D, SN74LS242N, SN74LS243D Datasheet

QUAD BUS TRANSCEIVER

The SN54/74LS242 and SN54/74LS243 are Quad Bus Transmitters/Receivers designed for 4-line asynchronous 2-way data communications between data buses.

•Hysteresis at Inputs to Improve Noise Immunity

•2-Way Asynchronous Data Bus Communication

•Input Clamp Diodes Limit High-Speed Termination Effects

LOGIC AND CONNECTION DIAGRAMS DIP (TOP VIEW)

		SN54 / 74LS242
VCC	GBA	NC	1B	2B	3B	4B
14	13	12	11	10	9	8
1	2	3	4	5	6	7
GBA	NC	1A	2A	3A	4A	GND	NOTE:

		SN54 / 74LS243
VCC	GBA	NC	1B	2B	3B	4B
14	13	12	11	10	9	8
1	2	3	4	5	6	7
GBA	NC	1A	2A	3A	4A	GND

The Flatpak version has the same pinouts

(Connection Diagram) as the Dual In-Line Package.

SN54/74LS242

SN54/74LS243

QUAD BUS TRANSCEIVER

LOW POWER SCHOTTKY

			J SUFFIX
			CERAMIC
			CASE 632-08
14	1
			N SUFFIX
			PLASTIC
14			CASE 646-06
	1
			D SUFFIX
	14		SOIC
			CASE 751A-02
		1

ORDERING INFORMATION

SN54LSXXXJ Ceramic

SN74LSXXXN Plastic

SN74LSXXXDW SOIC

TRUTH TABLES

SN54 / 74LS242

INPUTS		OUTPUT		INPUTS		OUTPUT
GAB	D			GAB	D
L	L	H		L	X	(Z)
L	H	L		H	L	H
H	X	(Z)		H	H	L

SN54/74LS243

	INPUTS		OUTPUT		INPUTS		OUTPUT
	GAB	D			GAB	D
	L	L	L		L	X	(Z)
	L	H	H		H	L	H
	H	X	(Z)		H	H	L

H = HIGH Voltage Level

L = LOW Voltage Level

X = Immaterial

Z = HIGH Impedance

FAST AND LS TTL DATA

5-393

SN54/74LS242 •SN54/74LS243

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			± 3.0	mA
		54			± 12	mA
		74			± 15
IOL	Output Current Ð Low	54			12	mA
		74			24

DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)

Limits

Symbol

Parameter

Min

Typ

Max

Unit

Test Conditions

VIH

Input HIGH Voltage

2.0

V

Guaranteed Input HIGH Voltage for

All Inputs

VIL

Input LOW Voltage

54

0.7

V

Guaranteed Input LOW Voltage for

74

0.8

All Inputs

VT+±VT±

Hysteresis

0.2

0.4

V

VCC = MIN

VIK

Input Clamp Diode Voltage

± 0.65

± 1.5

V

VCC = MIN, IIN = ±18 mA

VOH

Output HIGH Voltage

54, 74

2.4

3.4

V

VCC = MIN, IOH = ±3.0 mA

54, 74

2.0

V

VCC = MIN, IOH = MAX

54, 74

0.25

0.4

V

I = 12 mA

VCC = VCC MIN,

VOL

Output LOW Voltage

OL

VIN = VIL or VIH

74

0.35

0.5

V

IOL = 24 mA

per Truth Table

IOZH

Output Off Current HIGH

40

μA

VCC = MAX, VOUT = 2.7 V

IOZL

Output Off Current LOW

± 200

μA

VCC = MAX, VOUT = 0.4 V

D, E1, E2

20

μA

VCC = MAX, VIN = 2.7 V

IIH

Input HIGH Current

E1, E2

0.1

mA

VCC = MAX, VIN = 7.0 V

D Input

0.1

mA

VCC = MAX, VIN = 5.5 V

IIL

Input LOW Current

± 0.2

mA

VCC = MAX, VIN = 0.4 V

IOS

Output Short Circuit Current (Note 1)

± 40

± 225

mA

VCC = MAX

Power Supply Current

Total, Output HIGH

38

ICC

Total, Output LOW

50

mA

VCC = MAX

Total at HIGH Z

LS242

50

LS243

54

Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.

FAST AND LS TTL DATA

5-394