TI SN74ALS243AN

SN54ALS243A, SN74ALS243A
QUADRUPLE BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SDAS069B – DECEMBER 1982 – REVISED DECEMBER 1994
•
•
•
SN54ALS243A . . . J PACKAGE
SN74ALS243A . . . D OR N PACKAGE
(TOP VIEW)
Two-Way Asynchronous Communication
Between Data Buses
pnp Inputs Reduce dc Loading
Package Options Include Plastic
Small-Outline (D) Packages, Ceramic Chip
Carriers (FK), and Standard Plastic (N) and
Ceramic (J) 300-mil DIPs
OEAB
NC
A1
A2
A3
A4
GND
description
These quadruple bus transceivers are designed
for asynchronous two-way communication
between data buses. The control-function
implementation allows for maximum flexibility in
timing. These devices allow data transmission
from the A bus to the B bus or from the B bus to the
A bus depending upon the logic levels at the
output-enable (OEBA and OEAB) inputs. The
output-enable inputs can be used to disable the
device so that the buses are effectively isolated.
1
14
2
13
3
12
4
11
5
10
6
9
7
8
VCC
OEBA
NC
B1
B2
B3
B4
NC
OEAB
NC
VCC
OEBA
SN54ALS243A . . . FK PACKAGE
(TOP VIEW)
A1
NC
A2
NC
A3
3 2 1 20 19
18
5
17
6
16
7
15
8
14
9 10 11 12 13
NC
NC
B1
NC
B2
A4
GND
NC
B4
B3
The dual-enable configuration gives the
quadruple bus transceivers the capability to store
data by simultaneously enabling OEBA and
OEAB. Each output reinforces its input in this
transceiver configuration. When both control
inputs are enabled and all other data sources to
the two sets of bus lines are at high impedance,
both sets of bus lines (eight in all) retain their
states. The 4-bit codes appearing on the two sets
of buses are identical.
4
NC – No internal connection
The SN54ALS243A is characterized for operation over the full military temperature range of – 55°C to 125°C.
The SN74ALS243A is characterized for operation from 0°C to 70°C.
FUNCTION TABLE
INPUTS
OEAB
OEBA
FUNCTION
L
L
A to B
H
H
B to A
H
L
Isolation
H
Latch A and B
(A = B)
L
Copyright  1994, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
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1
SN54ALS243A, SN74ALS243A
QUADRUPLE BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SDAS069B – DECEMBER 1982 – REVISED DECEMBER 1994
logic symbol†
OEBA
13
1
OEAB
A1
A2
A3
A4
3
logic diagram (positive logic)
EN1
OEAB
EN2
A1
11
1
4
2
10
9
8
6
13
3
11
4
10
5
9
6
8
OEBA
B1
B1
B2
A2
5
1
B2
B3
B4
† This symbol is in accordance with ANSI/IEEE Std 91-1984 and
IEC Publication 617-12.
Pin numbers shown are for the D, J, and N packages.
A3
A4
B3
B4
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)‡
Supply voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
Input voltage, VI: All inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
I/O ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5 V
Operating free-air temperature range, TA: SN54ALS243A . . . . . . . . . . . . . . . . . . . . . . . . . . . – 55°C to 125°C
SN74ALS243A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 70°C
Storage temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 65°C to 150°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.
recommended operating conditions
SN54ALS243A
VCC
VIH
Supply voltage
VIL
IOH
Low-level input voltage
IOL
TA
2
High-level input voltage
SN74ALS243A
MIN
NOM
MAX
MIN
NOM
MAX
4.5
5
5.5
4.5
5
5.5
2
2
UNIT
V
V
0.7
0.8
V
High-level output current
– 12
– 15
mA
Low-level output current
12
24
mA
70
°C
Operating free-air temperature
– 55
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125
0
SN54ALS243A, SN74ALS243A
QUADRUPLE BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SDAS069B – DECEMBER 1982 – REVISED DECEMBER 1994
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
VIK
VOH
VOL
II
A or B ports
MIN
VCC = 4.5 V,
VCC = 4.5 V to 5.5 V,
II = – 18 mA
IOH = – 0.4 mA
VCC = 4.5 V
IOH = – 3 mA
IOH = – 12 mA
5V
VCC = 5
5.5
SN74ALS243A
TYP†
MAX
MIN
– 1.2
VCC – 2
2.4
– 1.2
VCC – 2
2.4
3.2
3.2
UNIT
V
V
2
IOH = – 15 mA
IOL = 12 mA
VCC = 4
4.5
5V
Control inputs
SN54ALS243A
TYP†
MAX
TEST CONDITIONS
2
0.25
0.4
0.25
0.4
0.35
0.5
IOL = 24 mA
VI = 7 V
0.1
0.1
VI = 5.5 V
0.1
0.1
20
20
20
20
– 0.1
– 0.1
– 0.1
– 0.1
IIH
Control inputs
A or B ports‡
VCC = 5
5.5
5V
V,
VI = 2
2.7
7V
IIL
Control inputs
A or B ports‡
VCC = 5
5.5
5V
V,
VI = 0
0.4
4V
IO§
VCC = 5.5 V,
VO = 2.25 V
Outputs high
15
30
15
25
ICC
VCC = 5.5 V
Outputs low
20
35
20
30
Outputs disabled
21
37
21
32
– 20
– 112
– 30
– 112
V
mA
µA
mA
mA
mA
† All typical values are at VCC = 5 V, TA = 25°C.
‡ For I/O ports, the parameters IIH and IIL include the off-state output current.
§ The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, IOS.
switching characteristics (see Figure 1)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
R1 = 500 Ω,
R2 = 500 Ω,
TA = MIN to MAX¶
SN54ALS243A
tPLH
tPHL
A or B
B or A
tPZH
tPZL
OEAB
B
tPHZ
tPLZ
OEAB
B
tPZH
tPZL
OEBA
A
tPHZ
tPLZ
OEBA
A
UNIT
SN74ALS243A
MIN
MAX
MIN
MAX
4
15
4
11
4
15
4
11
7
25
7
20
7
25
7
20
2
16
2
14
3
27
3
22
7
25
7
20
7
25
7
20
2
16
2
14
3
27
3
22
ns
ns
ns
ns
ns
¶ For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
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3
SN54ALS243A, SN74ALS243A
QUADRUPLE BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SDAS069B – DECEMBER 1982 – REVISED DECEMBER 1994
PARAMETER MEASUREMENT INFORMATION
SERIES 54ALS/74ALS AND 54AS/74AS DEVICES
7V
RL = R1 = R2
VCC
S1
RL
R1
Test
Point
From Output
Under Test
CL
(see Note A)
From Output
Under Test
RL
Test
Point
From Output
Under Test
CL
(see Note A)
CL
(see Note A)
LOAD CIRCUIT FOR
BI-STATE
TOTEM-POLE OUTPUTS
LOAD CIRCUIT
FOR OPEN-COLLECTOR OUTPUTS
3.5 V
Timing
Input
Test
Point
LOAD CIRCUIT
FOR 3-STATE OUTPUTS
3.5 V
High-Level
Pulse
1.3 V
R2
1.3 V
1.3 V
0.3 V
0.3 V
Data
Input
tw
th
tsu
3.5 V
1.3 V
3.5 V
Low-Level
Pulse
1.3 V
0.3 V
1.3 V
0.3 V
VOLTAGE WAVEFORMS
SETUP AND HOLD TIMES
VOLTAGE WAVEFORMS
PULSE DURATIONS
3.5 V
Output
Control
(low-level
enabling)
1.3 V
1.3 V
0.3 V
tPZL
Waveform 1
S1 Closed
(see Note B)
tPLZ
[3.5 V
1.3 V
tPHZ
tPZH
Waveform 2
S1 Open
(see Note B)
1.3 V
VOL
0.3 V
VOH
1.3 V
0.3 V
[0 V
3.5 V
1.3 V
Input
1.3 V
0.3 V
tPHL
tPLH
VOH
In-Phase
Output
1.3 V
1.3 V
VOL
tPLH
tPHL
VOH
Out-of-Phase
Output
(see Note C)
1.3 V
1.3 V
VOL
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES, 3-STATE OUTPUTS
NOTES: A. CL includes probe and jig capacitance.
B. Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control.
Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control.
C. When measuring propagation delay items of 3-state outputs, switch S1 is open.
D. All input pulses have the following characteristics: PRR ≤ 1 MHz, tr = tf = 2 ns, duty cycle = 50%.
E. The outputs are measured one at a time with one transition per measurement.
Figure 1. Load Circuits and Voltage Waveforms
4
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Copyright  1998, Texas Instruments Incorporated