TI SN75140

SN75140
DUAL LINE RECEIVER
SLLS080C – JANUARY 1977 – REVISED APRIL 1998
D
D
D
D
D
D
D
D
D
P OR PS† PACKAGE
(TOP VIEW)
Single 5-V Supply
±100-mV Sensitivity
For Application as:
– Single-Ended Line Receiver
– Gated Oscillator
– Level Comparator
Adjustable Reference Voltage
TTL Outputs
TTL-Compatible Strobe
Designed for Party-Line (Data-Bus)
Applications
Common Reference-Voltage Pin
Common Strobe
1OUT
COMSTRB
1LINE
GND
1
8
2
7
3
6
4
5
VCC
2OUT
COMREF
2LINE
† The PS package is only available
left-ended taped and reeled (order
SN75140 PSR).
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
STROBE
OUTPUT
≤ Vref – 100 mV
L
H
≥ Vref + 100 mV
X
L
X
H
L
H = high level, L = low level, X = irrelevant
logic symbol‡
COMSTRB
1LINE
COMREF
2LINE
2
≥1
3
1
1OUT
6
≥1
5
7
2OUT
‡ 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.
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1
SN75140
DUAL LINE RECEIVER
SLLS080C – JANUARY 1977 – REVISED APRIL 1998
logic diagram (positive logic)
COMSTRB
1LINE
COMREF
2
1
3
6
7
2LINE
1OUT
2OUT
5
schematic (each receiver)
1500
LINE
COMREF
750
1500
4000
4000
130
VCC
To Other
Line Receiver
1500
470
750
470
850
OUT
500
1000
2900
To Other
Line Receiver
GND
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, VCC (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
Reference input voltage, Vref . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5 V
Line input voltage range with respect to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –2 V to 5.5 V
Line input voltage with respect to Vref . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±5 V
Strobe input voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5 V
Continuous total power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Dissipation Rating Table
Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65°C to 150°C
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260°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.
NOTE 1: Unless otherwise specified, voltage values are with respect to network ground terminal.
DISSIPATION RATING TABLE
2
PACKAGE
TA ≤ 25°C
POWER RATING
DERATING FACTOR
ABOVE TA = 25°C
TA = 70°C
POWER RATING
P
1000 mW
8.0 mW/°C
640 mW
PS
450 mW
3.6 mW/°C
288 mW
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SN75140
DUAL LINE RECEIVER
SLLS080C – JANUARY 1977 – REVISED APRIL 1998
recommended operating conditions
MIN
NOM
MAX
4.5
5
5.5
V
Supply voltage, VCC
Reference input voltage, Vref
UNIT
1.5
3.5
V
Vref+0.1
0
VCC–1
Vref–0.1
V
High-level strobe input voltage, VIH(S)
2
5.5
V
Low-level strobe input voltage, VIL(S)
0
0.8
V
Operating free-air temperature range, TA
0
70
°C
High-level line input voltage, VIH(L)
Low-level line input voltage, VIL(L)
electrical characteristics over recommended operating
VCC = 5 V ±10%, Vref = 1.5 V to 3.5 V (unless otherwise noted)
PARAMETER
free-air
TEST CONDITIONS
temperature
range,
TYP†
MAX
UNIT
–1.5
V
MIN
VIK
Strobe input clamp voltage
II(S) = –12 mA
VOH
High level output voltage
High-level
VIL(L) = Vreff – 100 mV
mV,
VIL(S) = 0
0.8
8V
V,
IOH = –400
400 µA
Low level output voltage
Low-level
VIH(L) = Vreff + 100 mV,
mV
VIL(S) = 0
0.8
8V
V,
IOL = 16 mA
04
0.4
VOL
VIL(L) = Vreff – 100 mV
mV,
VIH(S) = 2 V,
V
IOL = 16 mA
04
0.4
II(S)
Strobe input
current at
maximum input
voltage
IIH
LINE
COMREF
Strobe
COMSTRB
L
l
l
Low-level
in
ut current
input
LINE
Reference
IOS
ICCH
V
1
mA
COMSTRB
Reference
IIL
V
VI(S) = 5
5.5
5V
COMSTRB
Hi h l
l
High-level
in
ut current
input
24
2.4
Strobe
Strobe
COMREF
Short-circuit output current‡
Supply current, output high
V
2
40
VI(S) = 2
2.4
4V
80
VI(L) = 3.5 V,
Vref = 1.5 V
VI(L) = 0
0,
Vreff = 3.5
35V
35
100
35
100
70
200
–1.6
VI(S) = 0
0.4
4V
–3.2
VI(L) = 0,
Vref = 1.5 V
VI(L) = 1
1.5
5V
V,
Vreff = 0
VCC = 5.5 V
VI(S) = 0,
mA
–10
–10
µA
–20
–18
VI(L) = Vref – 100 mV
VI(L) = Vref + 100 mV
ICCL
Supply current, output low
VI(S) = 0,
† All typical values are at VCC = 5 V, TA = 25°C.
‡ Only one output should be shorted at a time.
µA
–55
mA
18
30
mA
20
35
mA
switching characteristics, VCC = 5 V, Vref = 2.5 V, TA = 25°C
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
22
35
ns
tPLH(L)
Propagation delay time, low- to high-level output from LINE
CL = 15 pF, RL = 400 kΩ,
See Figure 1
tPHL(L)
Propagation delay time, high- to low-level output from LINE
CL = 15 pF, RL = 400 kΩ,
See Figure 1
22
30
ns
tPLH(S)
Propagation delay time,
low- to high-level output from COMSTRB
CL = 15 pF, RL = 400 kΩ,
See Figure 1
12
22
ns
tPHL(S)
Propagation delay time,
high- to low-level output from COMSTRB
CL = 15 pF, RL = 400 kΩ,
See Figure 1
8
15
ns
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• DALLAS, TEXAS 75265
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SN75140
DUAL LINE RECEIVER
SLLS080C – JANUARY 1977 – REVISED APRIL 1998
PARAMETER MEASUREMENT INFORMATION
≤ 10 ns
≤ 10 ns
90%
2.5 V
2.5 V
VCC
LINE
Output
10%
2.7 V
2.5 V
10%
2.3 V
≤ 10 ns
RL = 400 Ω
(see Note D)
LINE
COMSTRB
COMSTRB
(see Note B)
≤ 10 ns
1.5 V
ÌÌÌ
tPHL(L)
90%
10%
10%
tPLH(S)
VOH
CL = 15 pF
(see Note B)
Output
1.5 V
1.5 V
1.5 V
1.5 V
VOL
VOLTAGE WAVEFORMS
TEST CIRCUIT
(see Note A)
Input pulses are supplied by generators having the following characteristics: PRR ≤ 1 MHz, duty cycle ≤ 50%, ZO = 50 Ω.
Unused strobes are to be grounded.
CL includes probe and jig capacitance.
All diodes are 1N3064.
Figure 1. Test Circuit and Voltage Waveforms
TYPICAL CHARACTERISTICS
OUTPUT VOLTAGE
vs
LINE INPUT VOLTAGE
ÌÌÌÌÌ
ÌÌÌÌÌ
ÌÌÌÌÌ
ÌÌÌÌÌ
VO – Output Voltage – V
VO
4
VCC = 5 V
Vref = 2.5 V
VI(S) = 0
TA = 25°C
3
2
1
0
0
1
2
3
VI(L) – Line Input Voltage – V
Figure 2
4
0V
tPHL(S)
tPLH(L)
NOTES: A.
B.
C.
D.
3.5 V
1.5 V
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SN75140
DUAL LINE RECEIVER
SLLS080C – JANUARY 1977 – REVISED APRIL 1998
APPLICATION INFORMATION
5V
Twisted-Pair Line
Strobe
Data Input
OUT
Strobe
RT
Vref
1/2 SN75372
1/2 SN75140
Figure 3. Line Receiver
COMSTRB
Any Series
SN54/SN74
Logic
N=1
1.5 V
SN75140
N=2
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
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• DALLAS, TEXAS 75265
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SN75140
DUAL LINE RECEIVER
SLLS080C – JANUARY 1977 – REVISED APRIL 1998
APPLICATION INFORMATION
5V
RT (50 Ω to 100 Ω
depending on line impedance)
VCC = 5 V
Data Bus
Data In
Data In Strobe
1/2 SN75453B
VCC = 5 V
5V
Data Out
Vref = 1.5 V to 3.5 V
Data Out Strobe
1/2 SN75140
NOTE A: Using this arrangement, as many as 100 transceivers can be connected to a single data bus. The adjustable reference-voltage feature
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
VCC = 5 V
R1
RF
Strobe
Signal Input
TTL Output
RT
1/2 SN75140
Figure 6. Schmitt Trigger
6
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SN75140
DUAL LINE RECEIVER
SLLS080C – JANUARY 1977 – REVISED APRIL 1998
APPLICATION INFORMATION
OUTPUT VOLTAGE
vs
INPUT VOLTAGE
4
4
3.5
3.5
3
3
VO
VO – Output Voltage – V
V
VO
O – Output Voltage – V
OUTPUT VOLTAGE
vs
INPUT VOLTAGE
2.5
2
1.5
1
0.5
0
ÌÌÌÌÌ
ÌÌÌÌÌ
ÌÌÌÌÌ
0.5
1
2
1.5
1
R1 = 6.2 kΩ
RT = 3.9 kΩ
RF = 16 kΩ
TA = 25°C
0
2.5
0.5
0
1.5
2
2.5
3
VI – Input Voltage – V
ÌÌÌÌÌ
ÌÌÌÌÌ
ÌÌÌÌÌ
ÌÌÌÌÌ
R1 = 5.9 kΩ
RT = 3.9 kΩ
RF = 5 kΩ
TA = 25°C
0
0.5
1
1.5
2
2.5
3
VI – Input Voltage – V
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. R1, RF, and RT can be adjusted for the desired hysteresis and trigger levels.
Figure 7. Examples of Transfer Characteristics
COMSTRB
VCC
OUT
Vref
RF
COMSTRB
OUT
tw
R
SN75140
C
Figure 8. Gated Oscillator
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SN75140
DUAL LINE RECEIVER
SLLS080C – JANUARY 1977 – REVISED APRIL 1998
APPLICATION INFORMATION
OSCILLATOR FREQUENCY
vs
RC TIME CONSTANT
f osc – Oscillator Frequency – MHz
40
20
Vref = 1.5 V
10
7
Vref = 2.5 V
4
RF = 15 kΩ
tw = 0.6
f
VCC = 5 V
TA = 25°C
2
0
0.1
0.2
0.4
0.7
1
2
RC Time Constant – µs
Figure 9
8
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Copyright  1998, Texas Instruments Incorporated