DM74LS243 [FAIRCHILD]
Quadruple Bus Transceiver; 四路总线收发器
| 型号： | DM74LS243 |
| 厂家： | 
FAIRCHILD SEMICONDUCTOR |
| 描述： | Quadruple Bus Transceiver |
| 文件： | 总5页 (文件大小：56K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
August 1986
Revised January 2000
DM74LS243
Quadruple Bus Transceiver
General Description
This four data line transceiver is designed for asynchro-
nous two-way communications between data buses. It can
be used to drive terminated lines down to 133Ω.
Features
■ Two-way asynchronous communication between data
buses
■ PNP inputs reduce DC loading on bus line
■ Hysteresis at data inputs improves noise margin
Ordering Code:
Order Number Package Number
Package Description
DM74LS243M
DM74LS243N
M14A
N14A
14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-120, 0.150 Narrow
14-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagram
Function Table
Control
Inputs
Data Port
Status
G AB
GBA
A
B
H
L
H
H
L
O
I
(Note 1)
I
(Note 1)
H
L
ISOLATED
L
O
I = Input
O = Output
H = HIGH Logic Level
L = LOW Logic Level
Note 1: Possibly destructive oscillation may occur if the transceivers are
enabled in both directions at once.
© 2000 Fairchild Semiconductor Corporation
DS006412
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Absolute Maximum Ratings(Note 2)
Supply Voltage
Input Voltage
Any G
7V
Note 2: The “Absolute Maximum Ratings” are those values beyond which
the safety of the device cannot be guaranteed. The device should not be
operated at these limits. The parametric values defined in the Electrical
Characteristics tables are not guaranteed at the absolute maximum ratings.
The “Recommended Operating Conditions” table will define the conditions
for actual device operation.
7V
A or B
5.5V
Operating Free Air Temperature Range
Storage Temperature Range
0°C to +70°C
−65°C to +150°C
Recommended Operating Conditions
Symbol
Parameter
Min
4.75
2
Nom
Max
Units
V
VCC
VIH
VIL
IOH
IOL
TA
Supply Voltage
5
5.25
HIGH Level Input Voltage
LOW Level Input Voltage
HIGH Level Output Current
LOW Level Output Current
Free Air Operating Temperature
V
0.8
−15
24
V
mA
mA
°C
0
70
Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
Symbol Parameter Conditions
Input Clamp Voltage
Typ
Min
Max
Units
(Note 3)
V
V
V
= Min, I = −18 mA
−1.5
V
V
I
CC
CC
I
HYS
Hysteresis (V − V
T+
)
= Min
0.2
2.7
2.4
2
0.4
T−
(Data Inputs Only)
V
HIGH Level Output Voltage
V
V
V
V
V
V
V
V
V
V
V
V
= Min, V = Min
OH
CC IH
= Max, I = −1 mA
IL
OH
= Min, V = Min
3.4
V
CC
IH
= Max, I = −3 mA
IL
OH
= Min, V = Min
CC
IH
= 0.5V, I = Max
IL
OH
V
LOW Level Output Voltage
= Min
I
I
= 12 mA
= Max
0.4
OL
CC
OL
OL
= Max
= Min
V
IL
0.5
40
IH
CC
I
I
I
Off-State Output Current,
HIGH Level Voltage Applied
Off-State Output Current,
LOW Level Voltage Applied
Input Current at Maximum
Input Voltage
= Max
V
V
= 2.7V
= 0.4V
µA
µA
OZH
OZL
I
O
O
= Max
= Min
IL
−200
IH
V
= Max
V = 5.5V
A or B
Any G
0.1
0.1
20
mA
mA
µA
CC
I
V = 7V
I
I
I
I
I
HIGH Level Input Current
LOW Level Input Current
Short Circuit Output Current
Supply Current
V
V
V
V
= Max, V = 2.7V
I
IH
CC
CC
CC
CC
= Max, V = 0.4V
−0.2
−225
38
mA
mA
IL
I
= Max (Note 4)
−40
OS
CC
= Max
Outputs HIGH
Outputs LOW
Outputs Disabled
22
29
32
Outputs
OPEN
50
mA
54
Note 3: All typicals are at V = 5V, T = 25°C.
CC
A
Note 4: Not more than one output should be shorted at a time, and the duration should not exceed one second.
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2
Switching Characteristics
at VCC = 5V, T = 25°C
A
Symbol
Parameter
Propagation Delay Time
LOW-to-HIGH Level Output
Propagation Delay Time
HIGH-to-LOW Level Output
Output Enable Time
to LOW Level
Conditions
Min
Max
Units
t
t
t
t
t
t
t
t
t
t
C
R
C
R
C
R
C
R
C
R
C
R
C
R
C
R
C
R
C
R
= 45 pF
= 667Ω
= 45 pF
= 667Ω
= 45 pF
= 667Ω
= 45 pF
= 667Ω
= 5 pF
PLH
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
18
ns
PHL
PZL
PZH
PLZ
PHZ
PLH
PHL
PZL
PZH
18
30
23
25
18
21
22
33
26
ns
ns
ns
ns
ns
ns
ns
ns
ns
Output Enable Time
to HIGH Level
Output Disable Time
from LOW Level
= 667Ω
= 5 pF
Output Disable Time
from HIGH Level
= 667Ω
= 150 pF
= 667Ω
= 150 pF
= 667Ω
= 150 pF
= 667Ω
= 150 pF
= 667Ω
Propagation Delay Time
LOW-to-HIGH Level Output
Propagation Delay Time
HIGH-to-LOW Level Output
Output Enable Time
to LOW Level
Output Enable Time
to HIGH Level
3
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Physical Dimensions inches (millimeters) unless otherwise noted
14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-120, 0.150 Narrow
Package Number M14A
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4
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
14-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Package Number N14A
Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and
Fairchild reserves the right at any time without notice to change said circuitry and specifications.
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD
SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the
body, or (b) support or sustain life, and (c) whose failure
to perform when properly used in accordance with
instructions for use provided in the labeling, can be rea-
sonably expected to result in a significant injury to the
user.
2. A critical component in any component of a life support
device or system whose failure to perform can be rea-
sonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
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5
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Bus Transceiver, LS Series, 1-Func, 4-Bit, True Output, TTL, PDSO14, 0.150 INCH, MS-120, SOIC-14
FAIRCHILD
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