Texas Instruments SN54ALS645AJ, SN54AS645J, SN74ALS645A-1DW, SN74ALS645A-1DWR, SN74ALS645A-1N Datasheet
...
SN54ALS645A, SN54AS645, SN74ALS645A, SN74AS645
OPERATION
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SDAS278 – JANUARY 1995
• Bidirectional Bus Transceivers in
High-Density 20-Pin Packages
• True Logic
• 3-State Outputs
• Package Options Include Plastic
Small-Outline (DW) Packages, Ceramic
Chip Carriers (FK), and Standard Plastic (N)
and Ceramic (J) 300-mil DIPs
description
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 level at the direction-control
(DIR) input. The output-enable (OE
used to disable the device so that the buses are
effectively isolated.
The -1 version of the SN74ALS645A is identical
to the standard version, except that the
recommended maximum IOL is increased to
48 mA. There is no -1 version of the
SN54ALS645A.
The SN54ALS645A and SN54AS645 are
characterized for operation over the full military
temperature range of –55°C to 125°C. The
SN74ALS645A and SN74AS645 are
characterized for operation from 0°C to 70°C.
) input can be
SN54ALS645A, SN54AS645 ...J PACKAGE
SN74ALS645A, SN74AS645 . . . DW OR N PACKAGE
SN54ALS645A, SN54AS645 . . . FK PACKAGE
A3
A4
A5
A6
A7
(TOP VIEW)
DIR
1
A1
2
A2
3
A3
4
A4
5
A5
6
A6
7
A7
8
9
A8
10
GND
(TOP VIEW)
A2A1DIR
3212019
4
5
6
7
8
9
10 11 12 13
A8
B8
20
19
18
17
16
15
14
13
12
11
V
CC
B7
OE
18
17
16
15
14
B6
V
OE
B1
B2
B3
B4
B5
B6
B7
B8
CC
B1
B2
B3
B4
B5
GND
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.
FUNCTION TABLE
INPUTS
OE DIR
L L B data to A bus
L H A data to B bus
H X Isolation
Copyright 1995, Texas Instruments Incorporated
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
1
SN54ALS645A, SN54AS645, SN74ALS645A, SN74AS645
UNIT
IOLLow-level output current
mA
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SDAS278 – JANUARY 1995
19
1
2
3
4
5
6
7
8
9
†
G3
3 EN1 [BA]
3 EN2 [AB]
1
logic diagram (positive logic)
19
OE
1
18
B1
2
17
16
15
14
13
12
11
B2
B3
B4
B5
B6
B7
B8
DIR
A1
182
To Seven Other Transceivers
logic symbol
OE
DIR
A1
A2
A3
A4
A5
A6
A7
A8
†
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, V
Input voltage, V
Operating free-air temperature range, T
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.
7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CC
: All inputs 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
I
I/O ports 5.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
: SN54ALS645A –55°C to 125°C. . . . . . . . . . . . . . . . . . . . . . . . . . .
A
SN74ALS645A 0°C to 70°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B1
‡
recommended operating conditions
V
CC
V
IH
V
IL
I
OH
T
A
§
Applies only to the -1 version and only if VCC is between 4.75 V and 5.25 V
2
SN54ALS645A SN74ALS645A
MIN NOM MAX MIN NOM MAX
Supply voltage 4.5 5 5.5 4.5 5 5.5 V
High-level input voltage 2 2 V
Low-level input voltage 0.7 0.8 V
High-level output current –12 –15 mA
p
Operating free-air temperature –55 125 0 70 °C
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
12 24
48
§
SN54ALS645A, SN54AS645, SN74ALS645A, SN74AS645
PARAMETER
TEST CONDITIONS
UNIT
V
V
I
V
V
mA
I
V
V
V
A
I
V
V
V
mA
A or B
B
A
ns
OE
A
B
ns
OE
A
B
ns
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SDAS278 – JANUARY 1995
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
SN54ALS645A SN74ALS645A
MIN TYP†MAX MIN TYP†MAX
V
IK
OH
V
OL
I
IH
IL
I
O
I
CC
†
All typical values are at VCC = 5 V, TA = 25°C.
‡
Applies only to the -1 version and only if VCC is between 4.75 V and 5.25 V
§
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.
Control inputs
A or B ports
Control inputs
A or B ports
Control inputs
A or B ports
¶
VCC = 4.5 V, II = –18 mA –1.5 –1.5 V
VCC = 4.5 V to 5.5 V, IOH = –0.4 mA VCC –2 VCC –2
IOH = –3 mA 2.4 3.2 2.4 3.2
VCC = 4.5 V
VCC = 4.5 V
= 5.5
CC
= 5.5 V,
§
§
CC
= 5.5 V,
CC
VCC = 5.5 V, VO = 2.25 V –20 –112 –30 –112 mA
VCC = 5.5 V
IOH = –12 mA 2
IOH = –15 mA 2
IOL = 12 mA 0.25 0.4 0.25 0.4
IOL = 24 mA 0.35 0.5
IOL = 48 mA
VI = 7 V 0.1 0.1
VI = 5.5 V 0.1 0.1
= 2.7
I
= 0.4
I
Outputs high 30 48 30 45
Outputs low 36 60 36 55
Outputs disabled 38 63 38 58
‡
20 20
20 20
–0.1 –0.1
–0.1 –0.1
0.35 0.5
V
µ
mA
switching characteristics (see Figure 1)
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
PARAMETER
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
#
For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
PLZ
FROM
(INPUT)
TO
(OUTPUT)
or
or
or
R1 = 500 Ω
R2 = 500 Ω,
TA = MIN to MAX
SN54ALS645A SN74ALS645A
MIN MAX MIN MAX
1 19 3 10
1 14 3 10
2 30 5 20
2 29 5 20
2 14 2 10
2 30 4 15
,
#
UNIT
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
3
SN54ALS645A, SN54AS645, SN74ALS645A, SN74AS645
UNIT
PARAMETER
TEST CONDITIONS
UNIT
V
V
VOLV
V
V
I
V
5.5 V
mA
I
V
V
V
A
I
V
V
V
mA
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SDAS278 – JANUARY 1995
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, V
Input voltage, V
7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CC
: All inputs 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
I
†
I/O ports 5.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range, T
: SN54AS645 –55°C to 125°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A
SN74AS645 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
SN54AS645 SN74AS645
MIN NOM MAX MIN NOM MAX
V
V
V
I
I
T
CC
IH
IL
OH
OL
A
Supply voltage 4.5 5 5.5 4.5 5 5.5 V
High-level input voltage 2 2 V
Low-level input voltage 0.8 0.8 V
High-level output current –12 –15 mA
Low-level output current 48 64 mA
Operating free-air temperature –55 125 0 70 °C
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
SN54AS645 SN74AS645
MIN TYP‡MAX MIN TYP‡MAX
V
IK
OH
I
IH
IL
I
O
I
CC
‡
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.
Control inputs
A or B ports
Control inputs
A or B ports
Control inputs
A or B ports
¶
VCC = 4.5 V, II = –18 mA –1.2 –1.2 V
VCC = 4.5 V to 5.5 V, IOH = –2 mA VCC –2 VCC –2
IOH = –3 mA 2.4 3.2 2.4 3.2
VCC = 4.5 V
= 4.5
CC
=
CC
= 5.5 V,
§
§
CC
= 5.5 V,
CC
VCC = 5.5 V, VO = 2.25 V –50 –150 –50 –150 mA
VCC = 5.5 V
IOH = –12 mA 2.4
IOH = –15 mA 2.4
IOL = 48 mA 0.3 0.55
IOL = 64 mA 0.35 0.55
VI = 7 V 0.1 0.1
VI = 5.5 V 0.1 0.1
= 2.7
I
= 0.4
I
Outputs high 62 97 62 97
Outputs low 95 149 95 149
Outputs disabled 79 123 79 123
20 20
70 70
–0.5 –0.5
–0.75 –0.75
µ
mA
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN54ALS645A, SN54AS645, SN74ALS645A, SN74AS645
A or B
B
A
ns
OE
A
B
ns
OE
A
B
ns
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
switching characteristics (see Figure 1)
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
PARAMETER
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
†
For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
PLZ
FROM
(INPUT)
TO
(OUTPUT)
or
or
or
R1 = 500 Ω
R2 = 500 Ω,
TA = MIN to MAX
SN54AS645 SN74AS645
MIN MAX MIN MAX
2 11 2 9.5
2 10.5 2 9
2 12 2 11
2 12 2 10
2 8 2 7
2 13 2 12
SDAS278 – JANUARY 1995
,
†
UNIT
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
5
SN54ALS645A, SN54AS645, SN74ALS645A, SN74AS645
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SDAS278 – JANUARY 1995
PARAMETER MEASUREMENT INFORMATION
SERIES 54ALS/74ALS AND 54AS/74AS DEVICES
V
CC
R
L
From Output
Under Test
(see Note A)
C
L
Test
Point
R
L
From Output
Under Test
(see Note A)
Test
Point
C
L
From Output
Under Test
(see Note A)
7 V
RL = R1 = R2
S1
R1
C
L
Test
Point
R2
LOAD CIRCUIT FOR
BI-STATE
TOTEM-POLE OUTPUTS
Timing
Input
t
su
Data
Input
VOLTAGE WAVEFORMS
SETUP AND HOLD TIMES
Output
Control
(low-level
enabling)
Waveform 1
S1 Closed
(see Note B)
Waveform 2
S1 Open
(see Note B)
t
PZL
t
PZH
ENABLE AND DISABLE TIMES, 3-STATE OUTPUTS
VOLTAGE WAVEFORMS
1.3 V
t
PHZ
1.3 V
1.3 V
t
1.3 V1.3 V
1.3 V1.3 V
FOR OPEN-COLLECTOR OUTPUTS
h
t
PLZ
LOAD CIRCUIT
3.5 V
0.3 V
3.5 V
0.3 V
3.5 V
0.3 V
[
3.5 V
V
OL
0.3 V
V
OH
0.3 V
[
0 V
High-Level
Low-Level
Out-of-Phase
(see Note C)
Pulse
Pulse
Input
In-Phase
Output
Output
LOAD CIRCUIT
FOR 3-STATE OUTPUTS
1.3 V 1.3 V
t
w
1.3 V 1.3 V
VOLTAGE WAVEFORMS
PULSE DURATIONS
1.3 V 1.3 V
t
PLH
t
PHL
1.3 V 1.3 V
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
1.3 V1.3 V
t
PHL
t
PLH
3.5 V
0.3 V
3.5 V
0.3 V
3.5 V
0.3 V
V
V
V
V
OH
OL
OH
OL
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
6
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
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