SN74AS641 [TI]
OCTAL BUS TRANSCEIVERS WITH OPEN-COLLECTOR OUTPUTS; 与集电极开路输出八路总线收发器
| 型号： | SN74AS641 |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | OCTAL BUS TRANSCEIVERS WITH OPEN-COLLECTOR OUTPUTS |
| 文件： | 总7页 (文件大小：117K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SN74ALS641A, SN74ALS642A, SN74AS641
OCTAL BUS TRANSCEIVERS
WITH OPEN-COLLECTOR OUTPUTS
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
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
DIR
A1
A2
A3
A4
A5
A6
A7
A8
V
CC
OE
B1
B2
B3
B4
B5
B6
B7
B8
DEVICE
LOGIC
True
SN74ALS641A, SN74AS641
SN74ALS642A
Inverting
description
GND
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 I is increased to 48 mA in the -1 versions.
OL
The SN74ALS641A, SN74ALS642A, and SN74AS641 are characterized for operation from 0°C to 70°C.
FUNCTION TABLE
INPUTS
OPERATION
SN74ALS641A
OE
DIR
SN74ALS642A
SN74AS641
B data to A bus
A data to B bus
Isolation
L
L
L
H
X
B data to A bus
A data to B bus
Isolation
H
†
logic symbols
SN74ALS641A, SN74AS641
SN74ALS642A
G3
19
19
1
G3
OE
1
OE
DIR
3 EN1 [BA]
3 EN2 [AB]
DIR
3 EN1 [BA]
3 EN2 [AB]
2
18
2
18
A1
B1
1
A1
B1
1
2
2
3
17
16
15
14
13
12
11
3
4
5
6
7
8
9
17
16
15
14
13
12
11
A2
4
B2
B3
B4
B5
B6
B7
B8
A2
A3
A4
A5
A6
A7
A8
B2
B3
B4
B5
B6
B7
B8
A3
5
A4
6
A5
7
A6
8
A7
9
A8
†
These symbols are in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
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.
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN74ALS641A, SN74ALS642A, SN74AS641
OCTAL BUS TRANSCEIVERS
WITH OPEN-COLLECTOR OUTPUTS
SDAS300 – MARCH 1995
logic diagrams (positive logic)
SN74ALS641A, SN74AS641
SN74ALS642A
19
19
1
OE
OE
1
DIR
DIR
18
18
B1
B1
2
2
A1
A1
To Seven Other Transceivers
To Seven Other Transceivers
†
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
CC
Input voltage, V : All inputs and I/O ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
I
Operating free-air temperature range, T : SN74ALS641A, SN74ALS642A . . . . . . . . . . . . . . . . . 0°C to 70°C
A
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
V
V
V
V
Supply voltage
4.5
2
5
5.5
V
V
V
V
CC
High-level input voltage
Low-level input voltage
High-level output voltage
IH
0.8
5.5
24
IL
OH
I
Low-level output current
mA
OL
‡
48
70
T
A
Operating free-air temperature
0
°C
‡
Applies only to the -1 version and only if V
CC
is between 4.75 V and 5.25 V
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN74ALS641A, SN74ALS642A, SN74AS641
OCTAL BUS TRANSCEIVERS
WITH OPEN-COLLECTOR OUTPUTS
SDAS300 – MARCH 1995
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
SN74ALS641A
SN74ALS642A
PARAMETER
TEST CONDITIONS
UNIT
†
MIN TYP
MAX
–1.5
0.1
0.4
0.5
0.5
0.1
20
V
V
V
= 4.5 V,
I = –18 mA
V
IK
CC
I
I
= 4.5 V,
V
OH
= 5.5 V
mA
OH
CC
I
I
I
= 12 mA
= 24 mA
= 48 mA
0.25
0.35
0.35
OL
OL
OL
V
OL
V
CC
= 4.5 V
V
‡
I
I
Control inputs
Control inputs
V
V
= 5.5 V,
= 5.5 V,
V = 7 V
mA
I
CC
I
V = 2.7 V
I
µA
IH
IL
CC
§
A or B ports
20
Control inputs
–0.1
–0.1
37
I
V
CC
V
CC
V
CC
= 5.5 V,
= 5.5 V
= 5.5 V
V = 0.4 V
I
mA
mA
§
A or B ports
Outputs high
Outputs low
Outputs high
Outputs low
25
33
8
SN74ALS641A
SN74ALS642A
47
I
CC
15
18
28
†
‡
§
All typical values are at V
= 5 V, T = 25°C.
A
CC
Applies only to the -1 version and only if V
is between 4.75 V and 5.25 V
CC
For I/O ports, the parameters I and I include the off-state output current.
IH IL
switching characteristics (see Figure 1)
V
C
R
= 4.5 V to 5.5 V,
= 50 pF,
CC
L
L
= 680 Ω,
= MIN to MAX
FROM
TO
(OUTPUT)
¶
PARAMETER
(INPUT)
UNIT
T
A
SN74ALS641A SN74ALS642A
MIN
5
MAX
25
MIN
10
5
MAX
30
t
t
t
t
t
t
PLH
PHL
PLH
PHL
PLH
PHL
A or B
ns
ns
ns
B or A
A or B
A or B
3
18
22
8
30
10
15
10
15
30
OE
8
30
38
8
32
30
DIR
8
32
38
¶
For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN74ALS641A, SN74ALS642A, SN74AS641
OCTAL BUS TRANSCEIVERS
WITH OPEN-COLLECTOR OUTPUTS
SDAS300 – MARCH 1995
†
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
CC
Input voltage, V : All inputs and I/O ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
I
Operating free-air temperature range, T : SN74AS641 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 70°C
A
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
UNIT
MAX
V
V
V
V
Supply voltage
4.5
2
5
5.5
V
V
CC
High-level input voltage
Low-level input voltage
High-level output voltage
Low-level output current
Operating free-air temperature
IH
0.8
5.5
64
V
IL
V
OH
I
mA
°C
OL
T
A
0
70
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
SN74AS641
PARAMETER
TEST CONDITIONS
UNIT
‡
MIN TYP
MAX
–1.2
0.1
V
IK
V
V
V
= 4.5 V,
I = –18 mA
I
V
mA
V
CC
CC
CC
I
= 4.5 V,
= 4.5 V,
V
= 5.5 V
OH
OH
= 64 mA
V
OL
I
0.35
0.55
0.1
OL
V = 7 V
Control inputs
A or B ports
I
I
I
I
I
V
CC
V
CC
V
CC
V
CC
= 5.5 V
= 5.5 V,
= 5.5 V,
= 5.5 V
mA
µA
I
V = 5.5 V
0.1
I
Control inputs
20
V = 2.7 V
I
IH
IL
§
A or B ports
70
Control inputs
–0.5
–0.75
82
V = 0.4 V
I
mA
mA
§
A or B ports
Outputs high
Outputs low
50
84
CC
136
‡
§
All typical values are at V
For I/O ports, the parameters I and I include the off-state output current.
= 5 V, T = 25°C.
A
IH IL
CC
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN74ALS641A, SN74ALS642A, SN74AS641
OCTAL BUS TRANSCEIVERS
WITH OPEN-COLLECTOR OUTPUTS
SDAS300 – MARCH 1995
switching characteristics (see Figure 1)
V
C
R
= 4.5 V to 5.5 V,
= 50 pF,
CC
L
L
= 680 Ω,
FROM
TO
(OUTPUT)
†
PARAMETER
(INPUT)
UNIT
T
A
= MIN to MAX
SN74AS641
MIN
5
MAX
21
t
t
t
t
t
t
PLH
PHL
PLH
PHL
PLH
PHL
A or B
ns
ns
ns
B or A
A or B
A or B
1
7.5
21
5
OE
1
9
5
22
DIR
1
10
†
For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN74ALS641A, SN74ALS642A, SN74AS641
OCTAL BUS TRANSCEIVERS
WITH OPEN-COLLECTOR OUTPUTS
SDAS300 – MARCH 1995
PARAMETER MEASUREMENT INFORMATION
SERIES 54ALS/74ALS AND 54AS/74AS DEVICES
7 V
R
= R1 = R2
V
CC
L
S1
R1
R
L
Test
Point
From Output
Under Test
From Output
Under Test
Test
Point
Test
Point
From Output
Under Test
C
C
L
R
L
R2
L
C
L
(see Note A)
(see Note A)
(see Note A)
LOAD CIRCUIT FOR
BI-STATE
TOTEM-POLE OUTPUTS
LOAD CIRCUIT
FOR OPEN-COLLECTOR OUTPUTS
LOAD CIRCUIT
FOR 3-STATE OUTPUTS
3.5 V
3.5 V
Timing
Input
High-Level
1.3 V
1.3 V
1.3 V
Pulse
0.3 V
0.3 V
t
h
t
w
t
su
3.5 V
3.5 V
0.3 V
Data
Input
Low-Level
1.3 V
1.3 V
1.3 V
1.3 V
Pulse
0.3 V
VOLTAGE WAVEFORMS
SETUP AND HOLD TIMES
VOLTAGE WAVEFORMS
PULSE DURATIONS
3.5 V
0.3 V
Output
Control
(low-level
enabling)
1.3 V
1.3 V
3.5 V
t
PZL
Input
1.3 V
1.3 V
t
PLZ
0.3 V
PHL
3.5 V
t
Waveform 1
S1 Closed
(see Note B)
t
PLH
1.3 V
V
OH
In-Phase
Output
1.3 V
1.3 V
1.3 V
V
OL
0.3 V
V
OL
t
PHZ
t
PLH
t
PZH
t
PHL
V
OH
V
Waveform 2
S1 Open
(see Note B)
OH
OL
Out-of-Phase
Output
(see Note C)
1.3 V
1.3 V
0.3 V
V
0 V
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES, 3-STATE OUTPUTS
NOTES: A.
C includes probe and jig capacitance.
L
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, t = t = 2 ns, duty cycle = 50%.
r
f
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
IMPORTANT NOTICE
Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue
any product or service without notice, and advise customers to obtain the latest version of relevant information
to verify, before placing orders, that information being relied on is current and complete. All products are sold
subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those
pertaining to warranty, patent infringement, and limitation of liability.
TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in
accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent
TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily
performed, except those mandated by government requirements.
CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF
DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL
APPLICATIONS”). TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, AUTHORIZED, OR
WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT DEVICES OR SYSTEMS OR OTHER
CRITICAL APPLICATIONS. INCLUSION OF TI PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO
BE FULLY AT THE CUSTOMER’S RISK.
In order to minimize risks associated with the customer’s applications, adequate design and operating
safeguards must be provided by the customer to minimize inherent or procedural hazards.
TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent
that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other
intellectual property right of TI covering or relating to any combination, machine, or process in which such
semiconductor products or services might be or are used. TI’s publication of information regarding any third
party’s products or services does not constitute TI’s approval, warranty or endorsement thereof.
Copyright 1998, Texas Instruments Incorporated
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