SDAS300 − MARCH 1995
•
•
•
DW OR N PACKAGE
(TOP VIEW)
Bidirectional Bus Transceivers in
High-Density 20-Pin Packages
Choice of True or Inverting Logic
Package Options Include Plastic
Small-Outline (DW) Packages and
Standard Plastic (N) 300-mil DIPs
DEVICE
LOGIC
SN74ALS641A, SN74AS641
True
SN74ALS642A
DIR
A1
A2
A3
A4
A5
A6
A7
A8
GND
Inverting
description
1
20
2
19
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
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
upon the level at the direction-control (DIR) input. The output-enable (OE) input disables the device so that the
buses are effectively isolated.
The -1 versions of the SN74ALS641A and SN74ALS642A are identical to the standard versions, except that
the recommended maximum IOL is increased to 48 mA in the -1 versions.
The SN74ALS641A, SN74ALS642A, and SN74AS641 are characterized for operation from 0°C to 70°C.
FUNCTION TABLE
INPUTS
OE
DIR
OPERATION
SN74ALS641A
SN74AS641
SN74ALS642A
L
L
B data to A bus
B data to A bus
L
H
A data to B bus
A data to B bus
H
X
Isolation
Isolation
Copyright 1995, Texas Instruments Incorporated
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• DALLAS, TEXAS 75265
• HOUSTON, TEXAS 77251−1443
POST OFFICE BOX 655303
POST OFFICE BOX 1443
1
SDAS300 − MARCH 1995
logic symbols†
SN74ALS641A, SN74AS641
OE
DIR
A1
19
1
2
SN74ALS642A
G3
OE
3 EN1 [BA]
3 EN2 [AB]
DIR
18
1
B1
A1
19
1
2
2
A2
A3
A4
A5
A6
A7
A8
3 EN1 [BA]
3 EN2 [AB]
18
1
B1
2
3
17
4
16
5
15
6
14
7
13
8
12
9
11
B2
A2
B3
A3
B4
A4
B5
A5
B6
A6
B7
A7
B8
A8
3
17
4
16
5
15
6
14
7
13
8
12
9
11
† These symbols are in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
2
G3
•
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POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443
•
B2
B3
B4
B5
B6
B7
B8
SDAS300 − MARCH 1995
logic diagrams (positive logic)
SN74ALS641A, SN74AS641
OE
DIR
A1
SN74ALS642A
19
OE
1
DIR
18
2
B1
A1
To Seven Other Transceivers
19
1
18
2
B1
To Seven Other Transceivers
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)†
Supply voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
Input voltage, VI: All inputs and I/O ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
Operating free-air temperature range, TA: SN74ALS641A, SN74ALS642A . . . . . . . . . . . . . . . . . 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
SN74ALS641A
SN74ALS642A
UNIT
MIN
NOM
MAX
4.5
5
5.5
VCC
VIH
Supply voltage
VIL
VOH
Low-level input voltage
0.8
V
High-level output voltage
5.5
V
Low-level output current
24
48‡
mA
70
°C
IOL
High-level input voltage
2
TA
Operating free-air temperature
‡ Applies only to the -1 version and only if VCC is between 4.75 V and 5.25 V
•
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443
•
0
V
V
3
SDAS300 − MARCH 1995
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
SN74ALS641A
SN74ALS642A
TEST CONDITIONS
MIN
VIK
IOH
VOL
VCC = 4.5 V,
VCC = 4.5 V,
II = − 18 mA
VOH = 5.5 V
VCC = 4.5 V
IOL = 12 mA
IOL = 24 mA
IOL = 48 mA‡
II
Control inputs
VCC = 5.5 V,
VI = 7 V
IIH
Control inputs
A or B ports§
VCC = 5.5 V,
VI = 2.7 V
IIL
Control inputs
A or B ports§
VCC = 5.5 V,
VI = 0.4 V
SN74ALS641A
VCC = 5.5 V
SN74ALS642A
VCC = 5.5 V
TYP†
UNIT
MAX
−1.5
V
0.1
mA
0.25
0.4
0.35
0.5
0.35
0.5
0.1
20
20
V
mA
A
µA
−0.1
ICC
−0.1
Outputs high
25
37
Outputs low
33
47
Outputs high
8
15
18
28
Outputs low
† 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.
mA
mA
switching characteristics (see Figure 1)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
tPLH
tPHL
A or B
B or A
tPLH
tPHL
OE
A or B
tPLH
tPHL
DIR
A or B
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
RL = 680 Ω,
TA = MIN to MAX¶
SN74ALS641A SN74ALS642A
MIN
MAX
MIN
MAX
5
25
10
30
3
18
5
22
8
30
10
30
8
30
15
38
8
32
10
30
8
32
15
38
¶ For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
4
•
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443
•
UNIT
ns
ns
ns
SDAS300 − MARCH 1995
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)†
Supply voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
Input voltage, VI: All inputs and I/O ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
Operating free-air temperature range, TA: SN74AS641 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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
SN74AS641
MIN
NOM
MAX
4.5
5
5.5
UNIT
VCC
VIH
Supply voltage
VIL
VOH
Low-level input voltage
0.8
V
High-level output voltage
5.5
V
IOL
TA
Low-level output current
64
mA
70
°C
High-level input voltage
2
Operating free-air temperature
V
V
0
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
VIK
IOH
VCC = 4.5 V,
VCC = 4.5 V,
II = − 18 mA
VOH = 5.5 V
VOL
VCC = 4.5 V,
IOL = 64 mA
VI = 7 V
Control inputs
II
A or B ports
VCC = 5.5 V
IIH
Control inputs
A or B ports§
VCC = 5.5 V,
VI = 2.7 V
IIL
Control inputs
A or B ports§
VCC = 5.5 V,
VI = 0.4 V
ICC
SN74AS641
TYP‡
MAX
MIN
0.35
UNIT
−1.2
V
0.1
mA
0.55
V
0.1
VI = 5.5 V
0.1
20
70
mA
A
µA
−0.5
VCC = 5.5 V
−0.75
Outputs high
50
82
Outputs low
84
136
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.
•
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443
•
5
SDAS300 − MARCH 1995
switching characteristics (see Figure 1)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
RL = 680 Ω,
TA = MIN to MAX†
UNIT
SN74AS641
MIN
tPLH
tPHL
A or B
B or A
tPLH
tPHL
OE
A or B
tPLH
tPHL
DIR
A or B
5
21
1
7.5
5
21
1
9
5
22
1
10
† For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
6
•
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443
•
MAX
ns
ns
ns
SDAS300 − MARCH 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
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
From Output
Under Test
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
PULSE DURATIONS
VOLTAGE WAVEFORMS
SETUP AND HOLD TIMES
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
Input
tPZH
1.3 V
0.3 V
tPHL
tPLH
VOH
In-Phase
Output
VOL
0.3 V
1.3 V
1.3 V
VOL
tPLH
tPHL
VOH
1.3 V
1.3 V
[3.5 V
1.3 V
tPHZ
Waveform 2
S1 Open
(see Note B)
1.3 V
VOH
Out-of-Phase
Output
(see Note C)
0.3 V
[0 V
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
•
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443
•
7
PACKAGE OPTION ADDENDUM
www.ti.com
10-Dec-2020
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
(2)
Lead finish/
Ball material
MSL Peak Temp
Op Temp (°C)
Device Marking
(3)
(4/5)
(6)
SN74ALS641A-1DW
ACTIVE
SOIC
DW
20
25
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
0 to 70
ALS641A-1
SN74ALS641A-1DWR
ACTIVE
SOIC
DW
20
2000
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
0 to 70
ALS641A-1
SN74ALS641A-1N
ACTIVE
PDIP
N
20
20
RoHS &
Non-Green
NIPDAU
N / A for Pkg Type
0 to 70
SN74ALS641A-1N
SN74ALS641A-1NSR
ACTIVE
SO
NS
20
2000
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
0 to 70
ALS641A-1
SN74ALS641ADW
ACTIVE
SOIC
DW
20
25
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
0 to 70
ALS641A
SN74ALS641ADWR
ACTIVE
SOIC
DW
20
2000
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
0 to 70
ALS641A
SN74ALS641AN
ACTIVE
PDIP
N
20
20
RoHS &
Non-Green
NIPDAU
N / A for Pkg Type
0 to 70
SN74ALS641AN
SN74ALS641ANSR
ACTIVE
SO
NS
20
2000
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
0 to 70
ALS641A
SN74ALS642A-1DW
ACTIVE
SOIC
DW
20
25
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
0 to 70
ALS642A-1
SN74ALS642A-1N
ACTIVE
PDIP
N
20
20
RoHS &
Non-Green
NIPDAU
N / A for Pkg Type
0 to 70
SN74ALS642A-1N
SN74ALS642A-1NSR
ACTIVE
SO
NS
20
2000
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
0 to 70
ALS642A-1
SN74AS641DW
ACTIVE
SOIC
DW
20
25
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
0 to 70
AS641
SN74AS641N
ACTIVE
PDIP
N
20
20
RoHS &
Non-Green
NIPDAU
N / A for Pkg Type
0 to 70
SN74AS641N
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Addendum-Page 1
Samples
PACKAGE OPTION ADDENDUM
www.ti.com
10-Dec-2020
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of
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