BUS TRANSCEIVER. SN54LS242 Datasheet

SN54LS242 TRANSCEIVER. Datasheet pdf. Equivalent

SN54LS242 Datasheet
Recommendation SN54LS242 Datasheet
Part SN54LS242
Description QUAD BUS TRANSCEIVER
Feature SN54LS242; QUAD BUS TRANSCEIVER The SN54/ 74LS242 and SN54 / 74LS243 are Quad Bus Transmitters / Receivers desi.
Manufacture Motorola Inc
Datasheet
Download SN54LS242 Datasheet




Motorola  Inc SN54LS242
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



Motorola  Inc SN54LS242
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



Motorola  Inc SN54LS242
SN54/74LS242 SN54/74LS243
AC CHARACTERISTICS (TA = 25°C, VCC = 5.0 V)
Limits
LS242
LS243
Symbol
Parameter
Min Typ Max Min Typ Max
tPLH
tPHL
Propagation Delay, Data to Output
9.0 14
12 18
12 18
12 18
tPZH
Output Enable Time to HIGH Level
15 23
15 23
tPZL
Output Enable Time to LOW Level
20 30
20 30
tPLZ
Output Disable Time from LOW Level
15 25
15 25
tPHZ
Output Disable Time from HIGH Level
10 18
10 18
Unit
ns
ns
ns
ns
ns
Test Conditions
CL = 45 pF,
RL = 667
CL = 5.0 pF,
RL = 667
AC WAVEFORMS
VIN
1.3 V
tPLH
VOUT
1.3 V
1.3 V
tPHL
1.3 V
Figure 1
VIN
1.3 V
tPHL
VOUT
1.3 V
1.3 V
tPLH
1.3 V
Figure 2
TO OUTPUT
UNDER TEST
VCC
RL
SW1
5 k
CL*
SW2
VE
VE
VOUT
1.3 V
1.3 V
tPZL
1.3 V
tPLZ
1.3 V
0.5 V
VOL
Figure 3
VE
VE
VOUT
1.3 V
tPZH
1.3 V
1.3 V
tPHZ
VOH
1.3 V
0.5 V
Figure 4
SWITCH POSITIONS
SYMBOL
tPZH
tPZL
tPLZ
tPHZ
SW1
Open
Closed
Closed
Closed
SW2
Closed
Open
Closed
Closed
Figure 5
FAST AND LS TTL DATA
5-395







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