SN74AS640N [TI]
OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS; 八路总线收发器与3态输出
| 型号： | SN74AS640N |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS |
| 文件： | 总7页 (文件大小：115K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SN54ALS640B, SN54AS640, SN74ALS640B, SN74AS640
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SDAS122A – DECEMBER 1983 – REVISED JANUARY 1995
SN54ALS640B, SN54AS640 . . . J PACKAGE
SN74ALS640B, SN74AS640 . . . DW OR N PACKAGE
(TOP VIEW)
• Bidirectional Bus Transceivers in
High-Density 20-Pin Packages
• Inverting Logic
• Package Options Include Plastic
Small-Outline (DW) Packages, Ceramic
Chip Carriers (FK), and Standard Plastic (N)
and Ceramic (J) 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
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 upon the level at the direction-control
(DIR) input. The output-enable (OE) input can be
used to disable the device so that the buses are
effectively isolated.
GND
SN54ALS640B, SN54AS640 . . . FK PACKAGE
(TOP VIEW)
The -1 version of the SN74ALS640B is identical to
the standard version, except that the
3
2
1
20 19
18
B1
B2
B3
B4
B5
A3
A4
A5
A6
A7
4
5
6
7
8
recommended maximum I for the -1 version is
OL
17
16
15
14
increased to 48 mA. There is no -1 version of the
SN54ALS640B.
The SN54ALS640B and SN54AS640 are
characterized for operation over the full military
temperature range of –55°C to 125°C. The
9 10 11 12 13
SN74ALS640B
and
SN74AS640
are
characterized for operation from 0°C to 70°C.
FUNCTION TABLE
INPUTS
OPERATION
OE
L
DIR
L
B data to A bus
A data to B bus
Isolation
L
H
H
X
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
SN54ALS640B, SN54AS640, SN74ALS640B, SN74AS640
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SDAS122A – DECEMBER 1983 – REVISED JANUARY 1995
†
logic symbol
logic diagram (positive logic)
19
19
OE
G3
OE
1
DIR
3 EN1 [BA]
3 EN2 [AB]
1
2
18
DIR
A1
B1
1
2
3
17
16
15
14
13
12
11
A2
4
B2
B3
B4
B5
B6
B7
B8
2
18
A3
5
B1
A1
A4
6
A5
7
A6
8
A7
9
To Seven Other Transceivers
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
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
CC
Input voltage, V : All inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
I
I/O ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5 V
Operating free-air temperature range, T : SN54ALS640B . . . . . . . . . . . . . . . . . . . . . . . . . . . –55°C to 125°C
A
SN74ALS640B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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
SN54ALS640B
MIN NOM MAX
SN74ALS640B
MIN NOM MAX
UNIT
V
V
V
Supply voltage
4.5
2
5
5.5
4.5
2
5
5.5
V
V
CC
High-level input voltage
Low-level input voltage
High-level output current
IH
0.7
–12
12
0.8
–15
24
V
IL
I
mA
OH
I
Low-level output current
mA
OL
§
48
70
T
A
Operating free-air temperature
–55
125
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
SN54ALS640B, SN54AS640, SN74ALS640B, SN74AS640
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SDAS122A – DECEMBER 1983 – REVISED JANUARY 1995
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
SN54ALS640B
SN74ALS640B
PARAMETER
TEST CONDITIONS
UNIT
†
†
MIN TYP
MAX
MIN TYP
MAX
V
V
V
V
= 4.5 V,
I = –18 mA
–1.5
–1.5
V
IK
CC
I
= 4.5 V to 5.5 V,
I
I
I
I
I
I
I
= –0.4 mA
= –3 mA
= –12 mA
= –15 mA
= 12 mA
V
–2
V
–2
CC
OH
OH
OH
OH
OL
OL
OL
CC
2.4
CC
2.4
3.2
3.2
V
V
OH
V
V
= 4.5 V
= 4.5 V
2
CC
2
0.25
0.4
0.25
0.35
0.35
0.4
0.5
0.5
0.1
0.1
20
V
OL
= 24 mA
CC
‡
= 48 mA
Control inputs
A or B ports
V = 7 V
I
0.1
0.1
I
I
V
V
= 5.5 V
= 5.5 V,
mA
I
CC
V = 5.5 V
I
Control inputs
20
V = 2.7 V
I
µA
IH
IL
CC
§
A or B ports
Control inputs
20
20
–0.1
–0.1
–112
50
–0.1
–0.1
–112
45
I
I
V
V
= 5.5 V,
= 5.5 V,
V = 0.4 V
I
mA
mA
CC
§
A or B ports
¶
V
O
= 2.25 V
–20
–30
O
CC
Outputs high
Outputs low
19
27
28
19
27
28
I
V
CC
= 5.5 V
60
55
mA
CC
Outputs disabled
55
50
†
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.
The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, I
IH IL
.
OS
switching characteristics (see Figure 1)
V
C
= 4.5 V to 5.5 V,
= 50 pF,
CC
L
R1 = 500 Ω,
R2 = 500 Ω,
T
A
FROM
TO
(OUTPUT)
PARAMETER
(INPUT)
UNIT
#
= MIN to MAX
SN54ALS640B SN74ALS640B
MIN
2
MAX
14
MIN
2
MAX
11
t
t
t
t
t
t
PLH
PHL
PZH
PZL
PHZ
PLZ
A or B
ns
ns
ns
B or A
A or B
A or B
2
13
2
10
4
25
4
21
OE
OE
5
27
5
24
2
12
2
10
3
20
3
15
#
For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN54ALS640B, SN54AS640, SN74ALS640B, SN74AS640
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SDAS122A – DECEMBER 1983 – REVISED JANUARY 1995
†
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
CC
Input voltage, V : All inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
I
I/O ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5 V
Operating free-air temperature range, T : SN54AS640 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –55°C to 125°C
A
SN74AS640 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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
SN54AS640
MIN NOM
SN74AS640
MIN NOM
UNIT
MAX
MAX
V
V
V
Supply voltage
4.5
2
5
5.5
4.5
2
5
5.5
V
V
CC
High-level input voltage
Low-level input voltage
High-level output current
Low-level output current
Operating free-air temperature
IH
0.8
–12
48
0.8
–15
64
V
IL
I
I
mA
mA
°C
OH
OL
T
A
–55
125
0
70
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
SN54AS640
SN74AS640
PARAMETER
TEST CONDITIONS
UNIT
‡
‡
MIN TYP
MAX
MIN TYP
MAX
V
V
V
V
= 4.5 V,
I = –18 mA
–1.2
–1.2
V
IK
CC
CC
CC
I
= 4.5 V,
I
I
I
I
I
I
I
= –2 mA
= –2 mA
= –3 mA
= –12 mA
= –15 mA
= 48 mA
= 64 mA
V
CC
–2
OH
OH
OH
OH
OH
OL
OL
= 4.5 V to 5.5 V,
V
–2
CC
2.4
V
OH
2.4
3.2
0.3
3.2
V
V
CC
= 4.5 V
2.4
2.4
0.55
V
OL
V
CC
V
CC
V
CC
= 4.5 V
= 5.5 V
= 5.5 V,
V
0.35
0.55
0.1
Control inputs
A or B ports
V = 7 V
I
0.1
0.1
I
I
mA
µA
V = 5.5 V
I
0.1
Control inputs
20
20
I
V = 2.7 V
I
IH
IL
§
A or B ports
70
70
Control inputs
–0.5
–0.75
–150
58
–0.5
–0.75
–150
58
I
I
V
V
= 5.5 V,
= 5.5 V,
V = 0.4 V
I
mA
mA
CC
§
A or B ports
¶
V
O
= 2.25 V
–50
–50
O
CC
Outputs high
Outputs low
37
78
51
37
78
51
I
V
CC
= 5.5 V
123
80
123
80
mA
CC
Outputs disabled
‡
§
¶
All typical values are at V
For I/O ports, the parameters I and I 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, I
= 5 V, T = 25°C.
A
IH IL
CC
.
OS
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN54ALS640B, SN54AS640, SN74ALS640B, SN74AS640
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SDAS122A – DECEMBER 1983 – REVISED JANUARY 1995
switching characteristics (see Figure 1)
V
C
= 4.5 V to 5.5 V,
= 50 pF,
CC
L
R1 = 500 Ω,
R2 = 500 Ω,
T
A
FROM
TO
(OUTPUT)
PARAMETER
(INPUT)
UNIT
†
= MIN to MAX
SN54AS640
SN74AS640
MIN
1
MAX
8
MIN
2
MAX
7
t
t
t
t
t
t
PLH
PHL
PZH
PZL
PHZ
PLZ
A or B
ns
ns
ns
B or A
A or B
A or B
1
7
2
6
2
10
12
9
2
8
OE
OE
2
2
10
8
2
2
2
16
2
13
†
For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN54ALS640B, SN54AS640, SN74ALS640B, SN74AS640
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SDAS122A – DECEMBER 1983 – REVISED JANUARY 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
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BE FULLY AT THE CUSTOMER’S RISK.
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safeguards must be provided by the customer to minimize inherent or procedural hazards.
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Copyright 1998, Texas Instruments Incorporated
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