SN75140PSR [TI]
双路线路接收器 | PS | 8 | 0 to 70;
| 型号： | SN75140PSR |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | 双路线路接收器 | PS | 8 | 0 to 70 驱动 线路驱动器或接收器 驱动程序和接口 |
| 文件： | 总9页 (文件大小：145K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SN75140
DUAL LINE RECEIVER
SLLS080C – JANUARY 1977 – REVISED APRIL 1998
†
P OR PS PACKAGE
Single 5-V Supply
(TOP VIEW)
±100-mV Sensitivity
For Application as:
– Single-Ended Line Receiver
– Gated Oscillator
1
2
3
4
8
7
6
5
1OUT
COMSTRB
1LINE
V
CC
2OUT
COMREF
2LINE
– Level Comparator
GND
Adjustable Reference Voltage
TTL Outputs
†
The PS package is only available
left-ended taped and reeled (order
SN75140 PSR).
TTL-Compatible Strobe
Designed for Party-Line (Data-Bus)
Applications
Common Reference-Voltage Pin
Common Strobe
description
This device consists of a dual single-ended line receiver with TTL-compatible strobes and outputs. The
reference voltage (switching threshold) is applied externally and can be adjusted from 1.5 V to 3.5 V, making
it possible to optimize noise immunity for a given system design. Due to the low input current (less than 100 µA),
the device is suited ideally for party-line (data-bus) systems.
The SN75140 has a common reference-voltage pin and a common strobe.
The SN75140 is characterized for operation from 0°C to 70°C.
FUNCTION TABLE
(each receiver)
LINE INPUT
≤ V – 100 mV
STROBE OUTPUT
L
X
H
H
L
L
ref
≥ V + 100 mV
ref
X
H = high level, L = low level, X = irrelevant
‡
logic symbol
2
3
COMSTRB
1LINE
≥1
≥1
1
7
1OUT
2OUT
6
5
COMREF
2LINE
‡
This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
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.
Copyright 1998, 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
SN75140
DUAL LINE RECEIVER
SLLS080C – JANUARY 1977 – REVISED APRIL 1998
logic diagram (positive logic)
2
COMSTRB
1
7
1OUT
2OUT
3
6
1LINE
COMREF
5
2LINE
schematic (each receiver)
V
CC
1500
750
1500
4000
4000
130
To Other
Line Receiver
1500
470
470
LINE
750
850
COMREF
OUT
GND
500
1000
2900
To Other
Line Receiver
To Other Line Receiver
COMSTRB
NOTE: Resistor values shown are nominal and in ohms.
†
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, V
Reference input voltage, V
(see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5 V
ref
Line input voltage range with respect to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –2 V to 5.5 V
Line input voltage with respect to V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±5 V
ref
Strobe input voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5 V
Continuous total power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Dissipation Rating Table
Storage temperature range, T
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260°C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –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.
NOTE 1: Unless otherwise specified, voltage values are with respect to network ground terminal.
DISSIPATION RATING TABLE
T
≤ 25°C
DERATING FACTOR
T = 70°C
A
POWER RATING
A
PACKAGE
POWER RATING
ABOVE T = 25°C
A
P
1000 mW
8.0 mW/°C
3.6 mW/°C
640 mW
PS
450 mW
288 mW
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN75140
DUAL LINE RECEIVER
SLLS080C – JANUARY 1977 – REVISED APRIL 1998
recommended operating conditions
MIN NOM
MAX
5.5
UNIT
V
Supply voltage, V
4.5
1.5
+0.1
0
5
CC
Reference input voltage, V
3.5
V
ref
High-level line input voltage, V
V
ref
V –1
CC
V
IH(L)
IL(L)
–0.1
Low-level line input voltage, V
V
V
ref
High-level strobe input voltage, V
2
5.5
0.8
70
V
IH(S)
Low-level strobe input voltage, V
0
V
IL(S)
Operating free-air temperature range, T
0
°C
A
electrical characteristics over recommended operating free-air temperature range,
= 5 V ±10%, V = 1.5 V to 3.5 V (unless otherwise noted)
V
CC
ref
†
PARAMETER
TEST CONDITIONS
MIN TYP
MAX
UNIT
V
V
V
Strobe input clamp voltage
High-level output voltage
I
= –12 mA
–1.5
IK
I(S)
V
V
V
= V – 100 mV,
ref
V
IL(S)
V
IL(S)
V
IH(S)
= 0.8 V,
= 0.8 V,
= 2 V,
I
I
I
= –400 µA
= 16 mA
= 16 mA
2.4
V
OH
IL(L)
IH(L)
IL(L)
OH
OL
OL
= V + 100 mV,
ref
0.4
0.4
V
OL
Low-level output voltage
V
= V – 100 mV,
ref
Strobe input
Strobe
1
2
current at
I
V
I(S)
= 5.5 V
mA
I(S)
maximum input
COMSTRB
voltage
Strobe
40
80
V
V
V
= 2.4 V
= 3.5 V,
= 0,
I(S)
I(L)
I(L)
COMSTRB
LINE
High-level
input current
I
V
= 1.5 V
35
35
70
100
100
200
–1.6
–3.2
–10
–10
–20
–55
30
µA
IH
IL
ref
Reference
COMREF
Strobe
V
ref
= 3.5 V
V
I(S)
V
I(L)
V
I(L)
= 0.4 V
= 0,
mA
COMSTRB
LINE
Low-level
input current
I
V
ref
= 1.5 V
= 0
Reference
COMREF
µA
= 1.5 V,
V
ref
‡
I
I
I
Short-circuit output current
V
CC
V
I(S)
V
I(S)
= 5.5 V
= 0,
–18
mA
mA
mA
OS
Supply current, output high
Supply current, output low
V
I(L)
= V – 100 mV
ref
18
20
CCH
CCL
= 0,
V
I(L)
= V + 100 mV
ref
35
†
‡
All typical values are at V
= 5 V, T = 25°C.
A
CC
Only one output should be shorted at a time.
switching characteristics, V
= 5 V, V = 2.5 V, T = 25°C
ref A
CC
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
C
= 15 pF, R = 400 kΩ,
L
L
t
t
t
t
Propagation delay time, low- to high-level output from LINE
Propagation delay time, high- to low-level output from LINE
22
35
ns
PLH(L)
PHL(L)
PLH(S)
PHL(S)
See Figure 1
C
= 15 pF, R = 400 kΩ,
L
L
22
12
8
30
22
15
ns
ns
ns
See Figure 1
C = 15 pF, R = 400 kΩ,
L
Propagation delay time,
low- to high-level output from COMSTRB
L
See Figure 1
C = 15 pF, R = 400 kΩ,
L
Propagation delay time,
high- to low-level output from COMSTRB
L
See Figure 1
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN75140
DUAL LINE RECEIVER
SLLS080C – JANUARY 1977 – REVISED APRIL 1998
PARAMETER MEASUREMENT INFORMATION
≤ 10 ns
≤ 10 ns
2.5 V
2.7 V
2.3 V
90%
2.5 V
LINE
10% 10%
V
CC
Output
R
2.5 V
≤ 10 ns
≤ 10 ns
3.5 V
0 V
= 400 Ω
L
90%
COMSTRB
(see Note D)
LINE
1.5 V
1.5 V
PHL(S)
10% 10%
COMSTRB
(see Note B)
t
t
PHL(L)
t
t
PLH(S)
PLH(L)
V
OH
C
= 15 pF
L
Output
1.5 V
1.5 V
1.5 V
1.5 V
(see Note B)
V
OL
TEST CIRCUIT
(see Note A)
VOLTAGE WAVEFORMS
NOTES: A. Input pulses are supplied by generators having the following characteristics: PRR ≤ 1 MHz, duty cycle ≤ 50%, Z = 50 Ω.
O
B. Unused strobes are to be grounded.
C.
C includes probe and jig capacitance.
L
D. All diodes are 1N3064.
Figure 1. Test Circuit and Voltage Waveforms
TYPICAL CHARACTERISTICS
OUTPUT VOLTAGE
vs
LINE INPUT VOLTAGE
4
V
= 5 V
= 2.5 V
= 0
= 25°C
CC
V
ref
V
I(S)
T
A
3
2
1
0
0
1
2
3
4
5
V
I(L)
– Line Input Voltage – V
Figure 2
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN75140
DUAL LINE RECEIVER
SLLS080C – JANUARY 1977 – REVISED APRIL 1998
APPLICATION INFORMATION
5 V
Strobe
Twisted-Pair Line
Data Input
Strobe
OUT
R
T
V
ref
1/2 SN75372
1/2 SN75140
Figure 3. Line Receiver
COMSTRB
Any Series
SN54/SN74
Logic
N = 1
N = 2
1.5 V
SN75140
COMSTRB
N = 74
1.5 V
SN75140
†
N = 75
†
Although most series SN54/SN74 circuits have a >2.4-V output at 400 µA, they typically are capable of maintaining a >2.4-V output level under
a load of 7.5 mA.
Figure 4. High Fanout From Standard TTL Gate
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN75140
DUAL LINE RECEIVER
SLLS080C – JANUARY 1977 – REVISED APRIL 1998
APPLICATION INFORMATION
5 V
V
CC
= 5 V
R (50 Ω to 100 Ω
T
depending on line impedance)
Data Bus
Data In
Data In Strobe
1/2 SN75453B
V
CC
= 5 V
5 V
Data Out
V
ref
= 1.5 V to 3.5 V
Data Out Strobe
1/2 SN75140
NOTE A: Usingthisarrangement, asmanyas100transceiverscanbeconnectedtoasingledatabus. Theadjustablereference-voltagefeature
allows the noise margin to be optimized for a given system. The complete dual bus transceiver (SN75453B driver and SN75140
receiver) can be assembled in approximately the same space required by a single 16-pin package and only one power supply is
required (5 V). Data in and data out are TTL compatible.
Figure 5. Dual Bus Transceiver
V
CC
= 5 V
R1
Strobe
R
F
Signal Input
TTL Output
R
T
1/2 SN75140
Figure 6. Schmitt Trigger
6
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN75140
DUAL LINE RECEIVER
SLLS080C – JANUARY 1977 – REVISED APRIL 1998
APPLICATION INFORMATION
OUTPUT VOLTAGE
OUTPUT VOLTAGE
vs
vs
INPUT VOLTAGE
INPUT VOLTAGE
4
3.5
3
4
3.5
3
2.5
2
2.5
2
1.5
1.5
1
1
R1 = 6.2 kΩ
R1 = 5.9 kΩ
R
R
T
= 3.9 kΩ
= 16 kΩ
= 25°C
R
R
T
= 3.9 kΩ
= 5 kΩ
= 25°C
T
F
A
T
F
A
0.5
0.5
0
0
0
0.5
1
1.5
2
2.5
3
0
0.5
1
1.5
2
2.5
3
V – Input Voltage – V
I
V – Input Voltage – V
I
NOTE A: Slowly changing input levels from data lines, optical detectors, and other types of transducers can be converted to standard TTL
signals with this Schmitt-trigger circuit. R , R , and R can be adjusted for the desired hysteresis and trigger levels.
1
F
T
Figure 7. Examples of Transfer Characteristics
COMSTRB
V
CC
OUT
COMSTRB
OUT
V
ref
R
F
t
w
R
SN75140
C
Figure 8. Gated Oscillator
7
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN75140
DUAL LINE RECEIVER
SLLS080C – JANUARY 1977 – REVISED APRIL 1998
APPLICATION INFORMATION
OSCILLATOR FREQUENCY
vs
RC TIME CONSTANT
40
20
V
ref
= 1.5 V
10
7
V
ref
= 2.5 V
4
2
R
= 15 kΩ
F
t
w
= 0.6
f
= 5 V
V
CC
T
A
= 25°C
0
0.1
0.2
0.4 0.7
1
2
4
7
10
RC Time Constant – µs
Figure 9
8
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
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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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DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL
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Copyright 1998, Texas Instruments Incorporated
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