SN74LS242 TRANSCEIVER Datasheet

SN74LS242 Datasheet, PDF, Equivalent


Part Number

SN74LS242

Description

QUAD BUS TRANSCEIVER

Manufacture

Motorola

Total Page 5 Pages
Datasheet
Download SN74LS242 Datasheet


SN74LS242
QUAD BUS TRANSCEIVER
The SN54/ 74LS242 and SN54 / 74LS243 are Quad Bus Transmitters / Re-
ceivers 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
14 13 12 11 10 9
4B
8
1234567
GBA NC 1A 2A 3A 4A GND
SN54 / 74LS243
VCC GBA NC 1B 2B 3B
14 13 12 11 10 9
4B
8
NOTE:
The Flatpak version
has the same pinouts
(Connection Diagram) as
the Dual In-Line Package.
1234567
GBA NC 1A 2A 3A 4A GND
SN54/74LS242
SN54/74LS243
QUAD BUS TRANSCEIVER
LOW POWER SCHOTTKY
14
1
J SUFFIX
CERAMIC
CASE 632-08
14
1
14
1
N SUFFIX
PLASTIC
CASE 646-06
D SUFFIX
SOIC
CASE 751A-02
ORDERING INFORMATION
SN54LSXXXJ Ceramic
SN74LSXXXN Plastic
SN74LSXXXDW SOIC
INPUTS
GAB D
LL
LH
HX
SN54 / 74LS242
OUTPUT
INPUTS
GAB D
H LX
L HL
(Z) H H
TRUTH TABLES
OUTPUT
INPUTS
GAB D
(Z) L L
H LH
L HX
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
Z = HIGH Impedance
SN54/74LS243
OUTPUT
INPUTS
GAB D
L LX
H HL
(Z) H H
OUTPUT
(Z)
H
L
FAST AND LS TTL DATA
5-393

SN74LS242
SN54/74LS242 SN54/74LS243
GUARANTEED OPERATING RANGES
Symbol
Parameter
VCC
Supply Voltage
TA Operating Ambient Temperature Range
IOH Output Current — High
IOL Output Current — Low
Min Typ Max Unit
54 4.5 5.0 5.5
74 4.75 5.0 5.25
V
54 – 55 25 125 °C
74 0 25 70
54, 74
– 3.0
mA
54 – 12 mA
74 – 15
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
74
0.7 Guaranteed Input LOW Voltage for
0.8 V All Inputs
VT+–VT–
VIK
VOH
VOL
Hysteresis
0.2 0.4
Input Clamp Diode Voltage
– 0.65 – 1.5
Output HIGH Voltage
54, 74
54, 74
2.4
2.0
3.4
Output LOW Voltage
54, 74
74
0.25 0.4
0.35 0.5
V VCC = MIN
V VCC = MIN, IIN = – 18 mA
V VCC = MIN, IOH = – 3.0 mA
V VCC = MIN, IOH = MAX
V IOL = 12 mA
V IOL = 24 mA
VCC = VCC MIN,
VIN = VIL or VIH
per Truth Table
IOZH
IOZL
IIH
IIL
IOS
Output Off Current HIGH
Output Off Current LOW
Input HIGH Current
D, E1, E2
E1, E2
D Input
Input LOW Current
Output Short Circuit Current (Note 1)
Power Supply Current
Total, Output HIGH
– 40
40
– 200
20
0.1
0.1
– 0.2
– 225
µA VCC = MAX, VOUT = 2.7 V
µA VCC = MAX, VOUT = 0.4 V
µA VCC = MAX, VIN = 2.7 V
mA VCC = MAX, VIN = 7.0 V
mA VCC = MAX, VIN = 5.5 V
mA VCC = MAX, VIN = 0.4 V
mA VCC = MAX
38
ICC Total, Output LOW
Total at HIGH Z
LS242
LS243
50
50
54
Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.
mA VCC = MAX
FAST AND LS TTL DATA
5-394


Features QUAD BUS TRANSCEIVER The SN54/ 74LS242 a nd SN54 / 74LS243 are Quad Bus Transmit ters / Receivers designed for 4-line as ynchronous 2-way data communications be tween data buses. SN54/74LS242 SN54/74 LS243 • Hysteresis at Inputs to Impr ove Noise Immunity • 2-Way Asynchrono us Data Bus Communication • Input Cla mp Diodes Limit High-Speed Termination Effects LOGIC AND CONNECTION DIAGRAMS D IP (TOP VIEW) SN54 / 74LS242 VCC 14 GBA 13 NC 12 1B 11 2B 10 3B 9 4B 8 QUAD B US TRANSCEIVER LOW POWER SCHOTTKY J SU FFIX CERAMIC CASE 632-08 14 1 1 GBA 2 NC 3 1A 4 2A 5 3A 6 4A 7 GND NOTE : The Flatpak version has the same pino uts (Connection Diagram) as the Dual In -Line Package. 14 1 N SUFFIX PLASTIC CASE 646-06 SN54 / 74LS243 VCC 14 GBA 13 NC 12 1B 11 2B 10 3B 9 4B 8 14 1 D SUFFIX SOIC CASE 751A-02 ORDERING INF ORMATION 1 GBA 2 NC 3 1A 4 2A 5 3A 6 4A 7 GND SN54LSXXXJ Ceramic SN74LSXXXN P lastic SN74LSXXXDW SOIC TRUTH TABLES S N54 / 74LS242 INPUTS OUTPUT GAB L L H D L H X H L (Z) GAB L H H D X L.
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