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SN54LS243, SN74LS243
www.ti.com
.............................................................................................................................................................
SDLS145A – APRIL 1985 – REVISED JULY 2008
QUADRUPLE BUS TRANSCEIVERS
1
FEATURES
Two-Way Asynchronous Communication
Between Data Buses
PNP Inputs Reduce D-C Loading
Hysteresis (Typically 400 mV) at Inputs
Improves Noise Margin
SN54LS243 . . . J OR W PACKAGE
SN74LS243 . . . D, N, OR NS PACKAGE
(TOP VIEW)
•
•
•
FUNCTION TABLE
(EACH TRANSCEIVER)
INPUTS
GAB
L
H
H
L
GBA
L
H
L
H
SNxxLS243
A to B
B to A
Isolation
Latch A and B
(A = B)
GAB
NC
A1
A2
A3
A4
GND
1
2
3
4
5
6
7
14
13
12
11
10
9
8
V
CC
GBA
NC
B1
B2
B3
B4
DESCRIPTION
These four-data-line transceivers are designed for asynchronous two-way communications between data buses.
SN74LS243 can be used to drive terminated lines down to 133
Ω.
SN54LS243 is characterized for operation over the full military temperature range of –55°C to 125°C.
SN74LS243 is characterized for operation from 0°C to 70°C.
SCHEMATICS OF INPUTS AND OUTPUTS
TYPICAL OF ALL OUTPUTS
V
CC
17 k
EQUIVALENT OF EACH INPUT
V
CC
50
NOM
INPUT
OUTPUT
GND
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 1985–2008, Texas Instruments Incorporated
SN54LS243, SN74LS243
SDLS145A – APRIL 1985 – REVISED JULY 2008
.............................................................................................................................................................
www.ti.com
LOGIC SYMBOL
GBA
GAB
A1
A2
A3
A4
13
1
3
4
5
6
EN1
EN2
1
2
10
9
8
B2
B3
B4
11
B1
A.
These symbols are in accordance with ANSI/EEE Std. 91-1984 and IEC Publication 617-12.
LOGIC DIAGRAM (POSITIVE LOGIC)
1
GAB
A1 3
13
GBA
11 B1
A2 4
10 B2
A3 5
9 B3
A4 6
8 B4
2
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Copyright © 1985–2008, Texas Instruments Incorporated
Product Folder Link(s):
SN54LS243 SN74LS243
SN54LS243, SN74LS243
www.ti.com
.............................................................................................................................................................
SDLS145A – APRIL 1985 – REVISED JULY 2008
ABSOLUTE MAXIMUM RATINGS
(1)
MIN
V
CC
V
IN
Supply voltage
(2)
Input voltage
OFF-state output voltage
T
A
T
stg
(1)
(2)
Operating free-air temperature range
Storage temperature range
SN54LS243
SN74LS243
–55
0
–65
MAX
7
7
5.5
125
70
150
UNIT
V
V
V
°C
°C
Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions beyond those indicated under
Recommended Operating
Conditions
is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
Voltage values are with respect to network ground terminal.
RECOMMENDED OPERATING CONDITIONS
over operating free-air temperature range (unless otherwise noted)
SN54LS243
MIN
V
CC
V
IH
V
IL
I
OH
I
OL
T
A
(1)
Supply voltage
(1)
High-level input voltage
Low-level input voltage
High-level output voltage
Low-level output voltage
Operating free-air temperature
Voltage values are with respect to network ground terminal.
–55
4.5
2
0.7
–12
12
125
0
NOM
5
MAX
5.5
SN74LS243
MIN
4.75
2
0.8
–15
24
70
NOM
5
MAX
5.25
UNIT
V
V
V
mA
mA
°C
Copyright © 1985–2008, Texas Instruments Incorporated
Submit Documentation Feedback
3
Product Folder Link(s):
SN54LS243 SN74LS243
SN54LS243, SN74LS243
SDLS145A – APRIL 1985 – REVISED JULY 2008
.............................................................................................................................................................
www.ti.com
ELECTRICAL CHARACTERISTICS
over operating free-air temperature range (unless otherwise noted)
PARAMETER
V
IK
A or B
V
CC
= MIN,
V
CC
= MIN,
V
IL
= MAX,
I
OH
= –3 mA
V
IL
= 0.5 V,
I
OH
= MAX
I
OL
= 12 mA
I
OL
= 24 mA
V
IH
= 2 V,
V
IH
= 2 V,
V
O
= 2.7 V
V
O
= 0.4 V
V
I
= 5.5 V
V
I
= 7 V
40
–200
0.1
0.1
20
–0.2
–0.2
–0.2
–40
22
V
CC
= MAX,
(3)
TEST CONDITIONS
(1)
I
I
= –18 mA
SN54LS243
MIN
0.2
2.4
2
0.25
0.4
TYP
(2)
SN74LS243
MAX
–1.5
MIN
0.2
2.4
2
0.25
0.35
0.4
0.5
40
–200
0.1
0.1
20
–0.2
–0.2
–0.2
–40
22
29
32
–225
38
50
54
TYP
(2)
MAX
–1.5
0.4
3.1
UNIT
V
V
V
Hysteresis (V
T+
– V
T–
)
0.4
3.1
V
OH
V
CC
= MIN,
V
IH
= 2 V,
V
OL
I
OZH
I
OZL
I
I
I
IH
A inputs
I
IL
B inputs
GAB or GBA
I
OS
Outputs high
I
CC
Outputs low
All outputs
disabled
(1)
(2)
(3)
A or B
GAB or GBA
V
CC
= MIN,
V
IL
= MAX
V
CC
= MIN,
V
IL
= MAX,
V
CC
= MIN,
V
IL
= MAX,
V
CC
= MAX,
V
CC
= MAX,
V
IH
= 2 V,
V
µA
µA
mA
µA
V
CC
= MAX, V
I
= 0.4 V,
GAB and GBA at 0 V
V
CC
= MAX, V
I
= 0.4 V,
GAB and GBA at 4.5 V
V
CC
= MAX, V
I
= 0.4 V,
V
CC
= MAX
mA
–225
38
50
54
mA
Outputs open,
29
32
mA
For conditions shown as MIN or MAX, use the appropriate value specified under "recommended operating conditions."
All typical values are at V
CC
= 5 V, T
A
= 25°C.
I
CC
is measured with transceivers eabled in one direction only, or with all transceivers disabled.
SWITCHING CHARACTERISTICS
V
CC
= 5 V, T
A
= 25°C
PARAMETER
t
PLH
t
PHL
t
PZL
t
PZH
t
PLZ
t
PHZ
R
L
= 667
Ω,
C
L
= 5 pF
R
L
= 667
Ω,
C
L
= 45 pF
TEST CONDITIONS
SN54LS243
MIN
TYP
9
12
20
15
10
15
MAX
14
18
30
23
20
25
SN74LS243
MIN
TYP
12
12
20
15
10
15
MAX
18
18
30
23
20
25
UNIT
ns
ns
ns
ns
ns
ns
4
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Copyright © 1985–2008, Texas Instruments Incorporated
Product Folder Link(s):
SN54LS243 SN74LS243
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