TI SN74ALS1245ADW

SN54ALS1245A, SN74ALS1245A
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SDAS245A – DECEMBER 1982 – REVISED JANUARY 1995
•
•
•
•
Bidirectional Bus Transceivers in
High-Density 20-Pin Packages
Low-Power Versions of ′ALS245 Series
′ALS1245 Series Is Identical to ′ALS1645
Series
Package Options Include Plastic
Small-Outline (DW) Packages, Ceramic
Chip Carriers (FK), and Standard Plastic (N)
and Ceramic (J) 300-mil DIPs
SN54ALS1245A . . . J PACKAGE
SN74ALS1245A . . . DW OR N PACKAGE
(TOP VIEW)
DIR
A1
A2
A3
A4
A5
A6
A7
A8
GND
description
The SN54ALS1245A is characterized for
operation over the full military temperature range
of – 55°C to 125°C. The SN74ALS1245A is
characterized for operation from 0°C to 70°C.
DIR
A3
A4
A5
A6
A7
OPERATION
L
L
B data to A bus
L
H
A data to B bus
H
X
Isolation
3
18
4
17
5
16
6
15
7
14
8
13
9
12
10
11
VCC
OE
B1
B2
B3
B4
B5
B6
B7
B8
4
3 2 1 20 19
18
5
17
6
16
7
15
8
14
9 10 11 12 13
B1
B2
B3
B4
B5
A8
GND
B8
B7
B6
OE
19
SN54ALS1245A . . . FK PACKAGE
(TOP VIEW)
FUNCTION TABLE
INPUTS
20
2
A2
A1
DIR
VCC
OE
These octal bus transceivers are designed for
asynchronous two-way communication between
data buses. These devices transmit data from the
A bus to the B bus or from the B bus to the A bus,
depending on the logic level at the directioncontrol (DIR) input. The output-enable (OE) input
can be used to disable the device so the buses are
effectively isolated.
1
Copyright  1995, 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
SN54ALS1245A, SN74ALS1245A
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SDAS245A – DECEMBER 1982 – REVISED JANUARY 1995
logic symbol†
OE
DIR
A1
19
1
2
logic diagram (positive logic)
19
OE
G3
3EN1 [BA]
3EN2 [AB]
18
1
1
DIR
B1
2
A2
A3
A4
A5
A6
A7
A8
3
17
4
16
5
15
6
14
7
13
8
12
9
11
B2
2
A1
18
B1
B3
B4
B5
B6
To Seven Other Transceivers
B7
B8
† This symbol is in accordance with ANSI/IEEE Std 91-1984 and
IEC Publication 617-12.
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: SN54ALS1245A . . . . . . . . . . . . . . . . . . . . . . . . . . – 55°C to 125°C
SN74ALS1245A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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
SN54ALS1245A
VCC
VIH
Supply voltage
VIL
IOH
Low-level input voltage
IOL
TA
Low-level output current
2
High-level input voltage
SN74ALS1245A
MIN
NOM
MAX
MIN
NOM
MAX
4.5
5
5.5
4.5
5
5.5
2
High-level output current
2
– 55
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V
V
0.7
0.8
V
– 12
– 15
mA
16
mA
70
°C
8
Operating free-air temperature
UNIT
125
0
SN54ALS1245A, SN74ALS1245A
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SDAS245A – DECEMBER 1982 – REVISED JANUARY 1995
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
VCC = 5
5.5
5V
SN74ALS1245A
TYP†
MAX
MIN
–1.5
VCC – 2
2.4
–1.5
VCC – 2
2.4
3.2
3.2
UNIT
V
V
2
IOH = – 15 mA
IOL= 8 mA
VCC = 4
4.5
5V
Control inputs
SN54ALS1245A
TYP†
MAX
TEST CONDITIONS
2
0.25
0.4
0.25
0.4
0.35
0.5
IOL = 16 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‡
5V
VCC = 5
5.5
V,
7V
VI = 2
2.7
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
21
33
21
30
ICC
VCC = 5.5 V
Outputs low
23
36
23
33
Outputs disabled
25
40
25
36
– 20
–112
– 30
–112
V
mA
µA
mA
mA
mA
† All typical values are 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)
tPLH
tPHL
A or B
B or A
tPZH
tPZL
OE
A or B
tPHZ
tPLZ
OE
A or B
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
R1 = 500 Ω,
R2 = 500 Ω,
TA = MIN to MAX¶
SN54ALS1245A SN74ALS1245A
MIN
MAX
MIN
MAX
2
19
2
13
2
15
2
13
8
30
8
25
8
29
8
25
2
14
2
12
3
30
3
18
UNIT
ns
ns
ns
¶ For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
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3
SN54ALS1245A, SN74ALS1245A
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SDAS245A – DECEMBER 1982 – REVISED JANUARY 1995
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
tsu
Data
Input
tw
th
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