74ACT11245NT [TI]
OCTAL BUS TRANSCEIVER WITH 3-STATE OUTPUTS; 八路总线收发器与3态输出
| 型号： | 74ACT11245NT |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | OCTAL BUS TRANSCEIVER WITH 3-STATE OUTPUTS |
| 文件： | 总6页 (文件大小：109K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
74ACT11245
OCTAL BUS TRANSCEIVER
WITH 3-STATE OUTPUTS
SCAS031C – JULY 1987 – REVISED APRIL 1996
DB, DW, NT, OR PW PACKAGE
(TOP VIEW)
3-State Outputs Drive Bus Lines Directly
Inputs Are TTL-Voltage Compatible
Flow-Through Architecture Optimizes
PCB Layout
A1
A2
A3
DIR
1
24
2
23 B1
22 B2
Center-Pin V
Minimize High-Speed Switching Noise
and GND Configurations
3
CC
4
21
20
19
18
17
16
15
14
13
A4
B3
B4
V
5
GND
GND
GND
GND
A5
A6
A7
A8
EPIC (Enhanced-Performance Implanted
CMOS) 1- m Process
6
CC
7
V
CC
500-mA Typical Latch-Up Immunity at
125°C
8
B5
B6
B7
B8
OE
9
Package Options Include Plastic
Small-Outline (DW), Shrink Small-Outline
(DB), and Thin Shrink Small-Outline (PW)
Packages, and Standard Plastic 300-mil
DIPs (NT)
10
11
12
description
The octal bus transceiver is designed for asynchronous two-way communication between data buses. The
control-function implementation minimizes external timing requirements.
The device allows data transmission 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. The output-enable (OE) input can be used to disable the
device so that the buses are effectively isolated.
The 74ACT11245 is characterized for operation from –40°C to 85°C.
FUNCTION TABLE
OUTPUT
ENABLE
OE
DIRECTION
CONTROL
DIR
OUTPUT
L
L
L
H
X
B data to A bus
A data to B bus
Isolation
H
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
74ACT11245
OCTAL BUS TRANSCEIVER
WITH 3-STATE OUTPUTS
SCAS031C – JULY 1987 – REVISED APRIL 1996
†
logic symbol
13
24
OE
G3
DIR
3 EN1 [BA]
3 EN2 [AB]
1
23
B1
A1
1
2
2
22
21
20
17
16
15
14
B2
B3
B4
B5
B6
B7
B8
A2
A3
A4
A5
A6
A7
A8
3
4
9
10
11
12
†
This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
logic diagram (positive logic)
24
1
DIR
A1
A2
A3
A4
A5
A6
A7
A8
13
23
22
21
20
17
16
15
14
OE
B1
B2
B3
B4
B5
B6
B7
B8
2
3
4
9
10
11
12
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
74ACT11245
OCTAL BUS TRANSCEIVER
WITH 3-STATE OUTPUTS
SCAS031C – JULY 1987 – REVISED APRIL 1996
†
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 ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±50 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 . . . . . . . . . . . . . . . . . . 0.65 W
O
O
CC
CC
or GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±200 mA
A
DW package . . . . . . . . . . . . . . . . . . 1.7 W
NT 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 NT package, which has a trace length of zero.
recommended operating conditions
MIN
4.5
2
MAX
UNIT
V
V
V
V
V
V
Supply voltage
5.5
CC
IH
IL
High-level input voltage
Low-level input voltage
Input voltage
V
0.8
V
0
0
V
V
V
I
CC
Output voltage
V
O
CC
I
I
High-level output current
Low-level output current
Input transition rise or fall rate
Operating free-air temperature
–24
24
mA
mA
ns/V
°C
OH
OL
t/ v
0
10
T
–40
85
A
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
74ACT11245
OCTAL BUS TRANSCEIVER
WITH 3-STATE OUTPUTS
SCAS031C – JULY 1987 – REVISED APRIL 1996
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
T
A
= 25°C
PARAMETER
TEST CONDITIONS
V
MIN
MAX
UNIT
CC
MIN
4.4
TYP
MAX
4.5 V
5.5 V
4.5 V
5.5 V
5.5 V
4.5 V
5.5 V
4.5 V
5.5 V
5.5 V
5.5 V
5.5 V
5.5 V
5.5 V
5 V
4.4
5.4
I
= –50 A
OH
5.4
3.94
4.94
3.8
V
V
OH
I
I
I
= –24 mA
= –75 mA
OH
OH
OL
4.8
3.85
0.1
0.1
0.1
0.1
0.44
0.44
1.65
±5
= 50
A
0.36
0.36
V
V
OL
I
I
= 24 mA
= 75 mA
OL
OL
‡
I
I
I
A or B ports
OE or DIR
V
= V or GND
CC
±0.5
±0.1
8
A
A
OZ
O
V = V
or GND
or GND,
±1
I
I
CC
CC
V = V
I = 0
O
80
A
CC
I
I
§
One input at 3.4 V, Other inputs at GND or V
CC
0.9
1
mA
pF
pF
CC
C
C
V = V
or GND
4
i
I
CC
= V or GND
CC
V
5 V
12
o
O
†
‡
§
Not more than one output should be tested at a time, and the duration of the test should not exceed 10 ms.
For I/O ports, the parameter I includes the input leakage current.
OZ
This is the increase in supply current for each input that is at one of the specified TTL voltage levels rather than 0 V or V
.
CC
switching characteristics over recomended ranges of supply voltage and operating free-air
temperature (unless otherwise noted) (see Figure 1)
T
A
= 25°C
TYP
6.2
FROM
(INPUT)
TO
(OUTPUT)
PARAMETER
MIN
MAX
UNIT
ns
MIN
1.5
1.5
1.5
1.5
1.5
1.5
MAX
9.2
t
t
t
t
t
t
1.5
1.5
1.5
1.5
1.5
1.5
10
9.1
PLH
PHL
PZH
PZL
PHZ
PLZ
A or B
B or A
A or B
A or B
5.4
8.6
8.1
12
13.2
12.9
12.9
13.9
ns
OE
OE
8.2
11.7
11.8
12.9
9.3
ns
9.8
operating characteristics, V
= 5 V, T = 25°C
A
CC
PARAMETER
TEST CONDITIONS
= 50 pF, f = 1 MHz
L
TYP
66
UNIT
Outputs enabled
Outputs disabled
C
Power dissipation capacitance per transceiver
C
pF
pd
19
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
74ACT11245
OCTAL BUS TRANSCEIVER
WITH 3-STATE OUTPUTS
SCAS031C – JULY 1987 – REVISED APRIL 1996
PARAMETER MEASUREMENT INFORMATION
2 × V
CC
Open
GND
TEST
S1
S1
t
/t
Open
PLH PHL
/t
500 Ω
From Output
Under Test
t
2 × V
CC
GND
PLZ PZL
t
/t
PHZ PZH
C
= 50 pF
L
500 Ω
(see Note A)
LOAD CIRCUIT
Output
Control
(low-level
enabling)
3 V
0 V
1.5 V
1.5 V
t
PZL
3 V
0 V
t
PLZ
Output
Waveform 1
V
CC
Input
1.5 V
1.5 V
50% V
CC
20% V
S1 at 2 × V
(see Note B)
CC
CC
CC
V
V
OL
t
PLH
t
PHZ
t
PHL
t
PZH
Output
Waveform 2
S1 at GND
V
OH
OH
0 V
80% V
50% V
50% V
Output
CC
CC
50% V
CC
V
OL
(see Note B)
VOLTAGE WAVEFORMS
C includes probe and jig capacitance.
L
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 = 3 ns, t = 3 ns.
O
r
f
D. The outputs are measured one at a time with one input transition per measurement.
Figure 1. Load Circuit and Voltage Waveforms
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
IMPORTANT NOTICE
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pertaining to warranty, patent infringement, and limitation of liability.
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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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Copyright 1998, Texas Instruments Incorporated
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