SN74AC245PW [TI]
OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS; 八路总线收发器与3态输出型号: | SN74AC245PW |
厂家: | TEXAS INSTRUMENTS |
描述: | OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS |
文件: | 总6页 (文件大小:102K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
SN54AC245, SN74AC245
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCAS461D – FEBRUARY 1995 – REVISED DECEMBER 1996
SN54AC245 . . . J OR W PACKAGE
SN74AC245 . . . DB, DW, N, OR PW PACKAGE
(TOP VIEW)
EPIC (Enhanced-Performance Implanted
CMOS) 1- m Process
Package Options Include Plastic
Small-Outline (DW), Shrink Small-Outline
(DB), and Thin Shrink Small-Outline (PW)
Packages, Ceramic Chip Carriers (FK), and
Flatpacks (W), and Standard Plastic (N) and
Ceramic (J) DIPs
DIR
A1
A2
A3
A4
V
CC
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
OE
B1
B2
B3
B4
B5
A5
A6
description
A7
A8
GND
13 B6
The ’AC245 octal bus transceivers are designed
for asynchronous two-way communication
between data buses. The control-function
implementation minimizes external timing
requirements.
12
11
B7
B8
SN54AC245 . . . FK PACKAGE
(TOP VIEW)
When the output-enable (OE) is low, the device
passes noninverted 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 direction control (DIR) input.
A high on OE disables the device so that the buses
are effectively isolated.
3
2
1
20 19
18
B1
B2
B3
A3
A4
A5
A6
A7
4
5
6
7
8
17
16
The SN54AC245 is characterized for operation
over the full military temperature range of –55°C
to 125°C. The SN74AC245 is characterized for
operation from –40°C to 85°C.
15 B4
14 B5
9 10 11 12 13
FUNCTION TABLE
INPUTS
OPERATION
DIR
OE
L
L
H
L
H
X
B data to A bus
A data to B bus
Isolation
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
EPIC is a trademark of Texas Instruments Incorporated.
Copyright 1996, 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
SN54AC245, SN74AC245
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCAS461D – FEBRUARY 1995 – REVISED DECEMBER 1996
†
logic diagram (positive logic)
logic symbol
19
1
G3
OE
DIR
1
DIR
3EN1[BA]
3EN2[AB]
19
18
OE
B1
2
18
A1
B1
1
2
A1
2
3
4
5
6
7
8
9
17
16
15
14
13
12
11
A2
A3
A4
A5
A6
A7
A8
B2
B3
B4
B5
B6
B7
B8
To Seven Other Channels
†
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 range, V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to 7 V
CC
Input voltage range, V (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to V
+ 0.5 V
+ 0.5 V
I
CC
CC
Output voltage range, V (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to V
O
Input clamp current, I (V < 0 or V > V ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±20 mA
IK
I
I
CC
Output clamp current, I
(V < 0 or V > V ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±20 mA
OK
O O CC
Continuous output current, I (V = 0 to V ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±50 mA
Continuous current through V
Maximum power dissipation at T = 55°C (in still air)(see Note 2): DB package . . . . . . . . . . . . . . . . . . . 0.6 W
O
O
CC
CC
or GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±200 mA
A
DW package . . . . . . . . . . . . . . . . . . 1.6 W
N package . . . . . . . . . . . . . . . . . . . . 1.3 W
PW package . . . . . . . . . . . . . . . . . . . 0.7 W
Storage temperature range, T . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65°C to 150°C
stg
‡
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.
NOTES: 1. The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
2. The maximum package power dissipation is calculated using a junction temperature of 150°C and a board trace length of 750 mils,
except for the N package, which has a trace length of zero.
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN54AC245, SN74AC245
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCAS461D – FEBRUARY 1995 – REVISED DECEMBER 1996
recommended operating conditions (see Note 3)
SN54AC245
SN74AC245
UNIT
MIN
2
MAX
MIN
2
MAX
V
V
Supply voltage
6
6
V
CC
V
CC
V
CC
V
CC
V
CC
V
CC
V
CC
= 3 V
2.1
2.1
High-level input voltage
= 4.5 V
= 5.5 V
= 3 V
3.15
3.85
3.15
3.85
V
V
IH
0.9
1.35
1.65
0.9
1.35
1.65
V
IL
Low-level input voltage
= 4.5 V
= 5.5 V
V
V
Input voltage
0
0
V
0
0
V
V
V
I
CC
CC
Output voltage
V
CC
V
CC
O
V
CC
V
CC
V
CC
V
CC
V
CC
V
CC
= 3 V
–12
–24
–24
12
–12
–24
–24
12
I
High-level output current
Low-level output current
= 4.5 V
= 5.5 V
= 3 V
mA
mA
OH
I
= 4.5 V
= 5.5 V
24
24
OL
24
24
t/ v
Input transition rise or fall rate
Operating free-air temperature
0
8
0
8
ns/V
T
–55
125
–40
85
°C
A
NOTE 3: Unused inputs must be held high or low to prevent them from floating.
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN54AC245, SN74AC245
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCAS461D – FEBRUARY 1995 – REVISED DECEMBER 1996
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
T
A
= 25°C
SN54AC245
SN74AC245
PARAMETER
TEST CONDITIONS
V
UNIT
CC
MIN
2.9
TYP
MAX
MIN
2.9
4.4
5.4
2.4
3.7
4.7
3.85
MAX
MIN
2.9
MAX
3 V
I
= –50
A
4.5 V
5.5 V
3 V
4.4
4.4
OH
5.4
5.4
I
I
= –12 mA
= –24 mA
2.56
3.86
4.86
2.46
3.76
4.76
OH
V
OH
V
4.5 V
5.5 V
5.5 V
5.5 V
3 V
OH
†
†
I
I
= –50 mA
= –75 mA
OH
3.85
OH
0.002
0.001
0.001
0.1
0.1
0.1
0.1
0.1
0.1
I
= 50
A
4.5 V
5.5 V
3 V
OL
0.1
0.1
0.1
I
I
= 12 mA
= 24 mA
0.36
0.36
0.36
0.5
0.44
0.44
0.44
OL
V
OL
V
4.5 V
5.5 V
5.5 V
5.5 V
0.5
OL
0.5
†
†
I
I
= 50 mA
1.65
OL
= 75 mA
1.65
±1
OL
‡
A or B ports
OE or DIR
±0.1
±0.1
±1
±1
I
V = V or GND
CC
5.5 V
5.5 V
A
A
I
I
±1
V
= V
or GND,
O
CC
V (OE) = V or V
IH
I
I
±0.5
±10
±5
OZ
I
IL
V = V
or GND,
or GND
I = 0
O
5.5 V
5 V
4
80
40
A
pF
pF
CC
I
CC
CC
C
C
V = V
4.5
15
i
I
V
= V or GND
CC
5 V
io
O
†
‡
Not more than one output should be tested at a time, and the duration of the test should not exceed 2 ms.
For I/O ports, the parameter I includes the input leakage current.
OZ
switching characteristics over recommended operating free-air temperature range,
= 3.3 V 0.3 V (unless otherwise noted) (see Figure 1)
V
CC
T = 25°C
A
SN54AC245
SN74AC245
FROM
(INPUT)
TO
(OUTPUT)
PARAMETER
UNIT
ns
MIN
1.5
1.5
2.5
2.5
2
TYP
5
MAX
8.5
MIN
1
MAX
11.5
10
MIN
1
MAX
9
t
t
PLH
PHL
PZH
A or B
B or A
A or B
A or B
5
8.5
1
1
9
t
7
11.5
12
1
13.5
14.5
13.5
14
2
12.5
13.5
12.5
13
ns
OE
OE
t
7.5
6.5
7
1
2
PZL
t
12
1
1
PHZ
ns
t
2
11.5
1
1.5
PLZ
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN54AC245, SN74AC245
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCAS461D – FEBRUARY 1995 – REVISED DECEMBER 1996
switching characteristics over recommended operating free-air temperature range,
= 5 V 5 V (unless otherwise noted) (see Figure 1)
V
CC
T
A
= 25°C
TYP
3.5
SN54AC245
SN74AC245
FROM
(INPUT)
TO
(OUTPUT)
PARAMETER
UNIT
ns
MIN
1.5
1.5
1.5
1.5
1.5
1.5
MAX
6.5
6
MIN
1
MAX
8.5
MIN
1
MAX
7
t
t
PLH
PHL
PZH
A or B
B or A
A or B
A or B
3.5
1
7.5
1
7
t
5
8.5
9
1
10
1
9
ns
OE
OE
t
5.5
1
10.5
10.5
10.5
1
9.5
10
10
PZL
t
5.5
9
1
1
PHZ
ns
t
5.5
9
1
1
PLZ
operating characteristics, V
= 5 V, T = 25°C
A
CC
PARAMETER
Power dissipation capacitance per transceiver
TEST CONDITIONS
= 50 pF, f = 1 MHz
L
TYP
UNIT
C
C
45
pF
pd
PARAMETER MEASUREMENT INFORMATION
2 × V
CC
TEST
S1
Open
2 × V
S1
t
/t
500 Ω
Open
PLH PHL
From Output
Under Test
t
/t
PLZ PZL
CC
Open
t
/t
PHZ PZH
C
= 50 pF
L
500 Ω
(see Note A)
LOAD CIRCUIT
50%
Output
Control
(low-level
enabling)
V
CC
V
50% V
50% V
CC
CC
CC
Input
50%
0 V
t
PZL
0 V
PHL
t
t
PLZ
t
PLH
Output
Waveform 1
V
CC
V
OH
50% V
CC
In-Phase
Output
V
V
+ 0.3 V
– 0.3 V
S1 at 2 × V
(see Note B)
OL
50% V
CC
50% V
CC
CC
V
V
OL
V
OL
t
PHZ
t
t
PLH
PZH
t
Output
Waveform 2
S1 at Open
(see Note B)
PHL
OH
0 V
V
OH
OH
Out-of-Phase
Output
50% V
CC
50% V
50% V
CC
VOLTAGE WAVEFORMS
C includes probe and jig capacitance.
L
CC
V
OL
VOLTAGE WAVEFORMS
NOTES: A.
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. All input pulses are supplied by generators having the following characteristics: PRR ≤ 1 MHz, Z = 50 Ω, t
D. The outputs are measured one at a time with one input transition per measurement.
2.5 ns, t
f
2.5 ns.
O
r
Figure 1. Load Circuit and Voltage Waveforms
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
IMPORTANT NOTICE
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any product or service without notice, and advise customers to obtain the latest version of relevant information
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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.
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DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL
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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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