SN54LS243J [MOTOROLA]
QUAD BUS TRANSCEIVER; 四路总线收发器
| 型号： | SN54LS243J |
| 厂家： | 
MOTOROLA |
| 描述： | QUAD BUS TRANSCEIVER |
| 文件： | 总5页 (文件大小：174K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SN54/74LS242
SN54/74LS243
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
QUAD BUS TRANSCEIVER
LOW POWER SCHOTTKY
LOGIC AND CONNECTION DIAGRAMS DIP (TOP VIEW)
SN54/74LS242
J SUFFIX
CERAMIC
CASE 632-08
14
1
N SUFFIX
PLASTIC
CASE 646-06
14
NOTE:
The Flatpak version
1
has the same pinouts
(Connection Diagram) as
the Dual In-Line Package.
SN54/74LS243
D SUFFIX
SOIC
CASE 751A-02
14
1
ORDERING INFORMATION
SN54LSXXXJ
Ceramic
SN74LSXXXN Plastic
SN74LSXXXDW SOIC
TRUTH TABLES
SN54/74LS242
SN54/74LS243
INPUTS
INPUTS
GAB
INPUTS
INPUTS
OUTPUT
OUTPUT
OUTPUT
OUTPUT
D
GAB
D
GAB
D
GAB
D
L
L
H
L
H
X
H
L
(Z)
L
H
H
X
L
H
(Z)
H
L
L
L
H
L
H
X
L
H
(Z)
L
H
H
X
L
H
(Z)
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
V
CC
Supply Voltage
54
74
4.5
4.75
5.0
5.0
5.5
5.25
V
T
Operating Ambient Temperature Range
Output Current — High
54
74
–55
0
25
25
125
70
°C
A
54, 74
–3.0
mA
mA
I
OH
54
74
–12
–15
I
Output Current — Low
54
74
12
24
mA
OL
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits
Min
Typ
Max
Symbol
Parameter
Input HIGH Voltage
Unit
Test Conditions
Guaranteed Input HIGH Voltage for
All Inputs
V
V
2.0
V
IH
54
74
0.7
0.8
Guaranteed Input LOW Voltage for
All Inputs
Input LOW Voltage
V
IL
V
V
–V
Hysteresis
0.2
0.4
–0.65
3.4
V
V
V
V
V
V
V
V
= MIN
T+ T–
CC
CC
CC
CC
Input Clamp Diode Voltage
–1.5
= MIN, I = –18 mA
IN
IK
54, 74
54, 74
2.4
2.0
= MIN, I
= –3.0 mA
= MAX
OH
OH
V
V
Output HIGH Voltage
Output LOW Voltage
OH
= MIN, I
V
CC
V
IN
= V
MIN,
= V or V
54, 74
74
0.25
0.35
0.4
0.5
V
V
I
= 12 mA
= 24 mA
CC
OL
IL
IH
OL
I
per Truth Table
OL
I
I
Output Off Current HIGH
Output Off Current LOW
40
–200
20
µA
µA
V
CC
V
CC
V
CC
V
CC
V
CC
V
CC
V
CC
= MAX, V
= MAX, V
= 2.7 V
= 0.4 V
OZH
OUT
OZL
OUT
D, E , E
µA
= MAX, V = 2.7 V
IN
1
2
E , E
0.1
mA
mA
mA
mA
= MAX, V = 7.0 V
IN
I
IH
Input HIGH Current
Input LOW Current
1
2
D Input
0.1
= MAX, V = 5.5 V
IN
I
I
–0.2
–225
= MAX, V = 0.4 V
IN
IL
Output Short Circuit Current (Note 1)
–40
= MAX
OS
Power Supply Current
Total, Output HIGH
38
50
50
54
Total, Output LOW
I
mA
V
CC
= MAX
CC
LS242
Total at HIGH Z
LS243
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
SN54/74LS242 • SN54/74LS243
AC CHARACTERISTICS (T = 25°C, V
CC
= 5.0 V)
A
Limits
LS242
LS243
Symbol
Parameter
Unit
Test Conditions
Min Typ Max Min Typ Max
t
t
9.0
12
14
18
12
12
18
18
PLH
PHL
Propagation Delay, Data to Output
ns
C
R
= 45 pF,
= 667 Ω
L
L
t
t
t
t
Output Enable Time to HIGH Level
Output Enable Time to LOW Level
Output Disable Time from LOW Level
Output Disable Time from HIGH Level
15
20
15
10
23
30
25
18
15
20
15
10
23
30
25
18
ns
ns
ns
ns
PZH
PZL
PLZ
PHZ
C
= 5.0 pF,
= 667 Ω
L
R
L
AC WAVEFORMS
Figure 1
Ω
Figure 2
SWITCH POSITIONS
≈
SYMBOL
SW1
Open
SW2
Closed
Open
t
PZH
t
Closed
Closed
Closed
PZL
PLZ
PHZ
Figure 3
t
Closed
Closed
t
Figure 5
≥
≈
Figure 4
FAST AND LS TTL DATA
5-395
Case 751A-02 D Suffix
14-Pin Plastic
SO-14
-A-
14
1
8
7
P
C
-B-
R X 45°
G
K
J
M
F
D
°
°
°
°
Case 632-08 J Suffix
14-Pin Ceramic Dual In-Line
-A-
14
1
8
7
-B-
C
L
-T-
K
M
F
G
N
J
D
°
°
°
°
Case 646-06 N Suffix
14-Pin Plastic
14
1
8
B
7
A
F
L
C
J
N
K
G
H
D
M
°
°
°
°
FAST AND LS TTL DATA
5-396
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相关型号：
SN54LS243JD
Bus Transceiver, LS Series, 1-Func, 4-Bit, True Output, TTL, CDIP14, CERAMIC, DIP-14
MOTOROLA
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