SN95176BW [TI]
LINE TRANSCEIVER, CDFP14;
| 型号： | SN95176BW |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | LINE TRANSCEIVER, CDFP14 驱动 CD 接口集成电路 驱动器 |
| 文件： | 总13页 (文件大小：208K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SN95176B
DIFFERENTIAL BUS TRANSCEIVER
SGLS026A – MARCH 1989 – REVISED JUNE 1995
JG PACKAGE
(TOP VIEW)
• Bidirectional Transceiver
• Suitable for Most EIA Standards RS-422-A
and RS-485 Applications
R
RE
DE
D
V
B
A
1
2
3
4
8
7
6
5
CC
• Designed for Multipoint Transmission on
Long Bus Lines in Noisy Environments
GND
• 3-State Driver and Receiver Outputs
• Individual Driver and Receiver Enables
W PACKAGE
(TOP VIEW)
• Wide Positive and Negative Input/Output
Bus Voltage Ranges
• Driver Output Capability . . . ±60 mA Max
• Thermal Shutdown Protection
R
NC
RE
NC
DE
NC
D
V
1
2
3
4
5
6
7
14
13
12
11
10
9
CC
NC
B
• Driver Positive- and Negative-Current
Limiting
NC
A
• Receiver Input Sensitivity . . . ±200 mV
• Receiver Input Hysteresis . . . 50 mV Typ
• Operates From Single 5-V Supply
• Low Power Requirements
NC
GND
8
FK PACKAGE
(TOP VIEW)
description
The SN95176B differential bus transceiver is a
monolithic integrated circuit designed for bi-
directional data communication on multipoint bus
transmission lines. The transceiver is suitable for
most RS-422-A and RS-485 applications to the
extent of the specified data sheet characteristics
and operating conditions.
3
4
2
1
20 19
18
NC
NC
RE
NC
DE
NC
B
17
16
15
14
5
6
7
8
NC
A
NC
The SN95176B combines a 3-state differential
line driver and a differential input line receiver,
both of which operate from a single 5-V power
supply. The driver and receiver have active-high
and active-low enables, respectively, that can be
externally connected together to function as a
9 10 11 12 13
NC – No internal connection
direction control. The driver differential outputs and the receiver differential inputs are connected internally to
form differential input/output (I/O) bus ports that are designed to offer minimum loading to the bus whenever the
driver is disabled or V
making the device suitable for party-line applications.
= 0. These ports feature wide positive and negative common-mode voltage ranges
CC
The driver is designed to handle loads up to 60 mA of sink or source current. The driver features positive- and
negative-current limiting and thermal shutdown for protection from line fault conditions. Thermal shutdown is
designed to occur at a junction temperature of approximately 150°C. The receiver features a minimum input
impedance of 12 kΩ, an input sensitivity of ±200 mV, and a typical input hysteresis of 50 mV.
The SN95176B is characterized for operation from –40°C to 110°C.
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.
2–1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN95176B
DIFFERENTIAL BUS TRANSCEIVER
SGLS026A – MARCH 1989 – REVISED JUNE 1995
Function Tables
DRIVER
RECEIVER
OUTPUTS
DIFFERENTIAL INPUTS ENABLE OUTPUT
INPUT ENABLE
A – B
≥ 0.2 V
RE
R
D
DE
A
B
H
L
H
H
L
H
L
L
H
Z
V
L
L
H
?
L
Z
ID
–0.2 V < V < 0.2 V
ID
≤ –0.2 V
X
Z
V
ID
L
X
H
H = high level, L = low level, ? = indeterminate, X = irrelevant, Z = high impedance (off)
†
logic symbol
logic diagram (positive logic)
3
DE
3
2
DE
RE
EN1
EN2
4
2
1
D
RE
R
6
7
6
7
A
B
A
B
4
1
1
1
D
R
Bus
2
†
This symbol is in accordance with ANSI/IEEE Std 91-1984
and IEC Publication 617-12.
Terminal numbers shown are for the JG package.
schematics of inputs and outputs
EQUIVALENT OF EACH INPUT
TYPICAL OF A AND B I/O PORTS
TYPICAL OF RECEIVER OUTPUT
V
CC
V
CC
V
CC
85 Ω
NOM
R
(eq)
16.8 kΩ
NOM
Input
960 Ω
NOM
960 Ω
NOM
Output
GND
Input/Output
Port
Driver input: R
= 3 kΩ NOM
(eq)
Enable inputs: R
= 8 kΩ NOM
(eq)
R
= equivalent resistor
(eq)
2–2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN95176B
DIFFERENTIAL BUS TRANSCEIVER
SGLS026A – MARCH 1989 – REVISED JUNE 1995
†
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, V
(see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
CC
Voltage at any bus terminal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –10 V to 15 V
Enable input voltage, V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5 V
I
Continuous total power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Dissipation Rating Table
Operating free-air temperature range, T
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –40°C to 110°C
A
Storage temperature range, T
Case temperature for 60 seconds, T : FK package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260°C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65°C to 150°C
stg
C
Lead temperature 1,6 mm (1/16 inch) from case for 60 seconds: JG or W package . . . . . . . . . . . . . . . 300°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: All voltage values, except differential input/output bus voltage, are with respect to network ground terminal.
DISSIPATION RATING TABLE
T
≤ 25°C
DERATING FACTOR
T
= 70°C
T
= 85°C
T = 110°C
A
A
A
A
PACKAGE
POWER RATING
ABOVE T = 25°C
POWER RATING POWER RATING POWER RATING
A
FK
JG
W
1375 mW
11.0 mW/°C
8.4 mW/°C
8.0 mW/°C
880 mW
672 mW
640 mW
715 mW
546 mW
520 mW
440 mW
336 mW
320 mW
1050 mW
1000 mW
recommended operating conditions
MIN
TYP
MAX
UNIT
Supply voltage, V
4.75
5
5.25
12
V
CC
Voltage at any bus terminal (separately or common-mode), V or V
V
I
IC
–7
High-level input voltage, V
D, DE, and RE
D, DE, and RE
2
V
V
IH
Low-level input voltage, V
IL
Differential input voltage, V (see Note 2)
0.8
±12
–60
–400
60
V
ID
Driver
mA
µA
High-level output current, I
OH
Receiver
Driver
Low-level output current, I
mA
OL
Receiver
8
Operating free-air temperature, T
–40
110
°C
A
NOTE 2: Differential-input/output bus voltage is measured at the noninverting terminal A with respect to the inverting terminal B.
2–3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN95176B
DIFFERENTIAL BUS TRANSCEIVER
SGLS026A – MARCH 1989 – REVISED JUNE 1995
DRIVER SECTION
electrical characteristics over recommended ranges of supply voltage and operating free-air
temperature (unless otherwise noted)
†
‡
PARAMETER
Input clamp voltage
TEST CONDITIONS
MIN TYP
MAX UNIT
V
V
I = –18 mA
–1.5
V
V
V
V
V
V
IK
I
Output voltage
I
O
I
O
= 0
0
1.5
2
6
6
O
|V
|
|
Differential output voltage
= 0
OD1
OD2
OD3
R
R
= 100 Ω,
= 54 Ω,
See Figure 1
See Figure 1
L
L
|V
Differential output voltage
1.5
2.5
4
5
V
Differential output voltage
See Note 3
Change in magnitude of differential output
voltage
∆|V
±0.2
3
V
V
V
OD|
§
V
OC
Common-mode output voltage
R
= 54 Ω,
L
See Figure 1
Change in magnitude of common-mode output
∆|V
|
±0.2
OC
§
voltage
V
V
= 12 V
= – 7 V
1
–0.8
20
Output disabled,
See Note 4
O
I
Output current
mA
O
O
I
I
High-level input current
Low-level input current
V = 2.4 V
I
µA
µA
IH
V = 0.4 V
I
–400
–250
–150
250
250
70
IL
V
O
V
O
V
O
V
O
= –7 V
= 0
I
Short-circuit output current
mA
mA
OS
CC
= V
CC
= 12 V
Outputs enabled
Outputs disabled
42
26
I
Supply current (total package)
No load
35
†
‡
§
The power-off measurement in EIA Standard RS-422-A applies to disabled outputs only and is not applied to combined inputs and outputs.
All typical values are at V
= 5 V and T = 25°C.
CC
A
∆|V
| and ∆|V
OD
| are the changes in magnitude of V
OC OD
and V , respectively, that occur when the input is changed from a high level to a low
OC
level.
NOTES: 3. See EIA Standard RS-485 Figure 3.5, Test Termination Measurement 2.
4. This applies for both power on and off; refer to EIA Standard RS-485 for exact conditions. The RS-422-A limit does not apply for
a combined driver and receiver terminal.
switching characteristics, V
= 5 V, T = 25°C
A
CC
PARAMETER
TEST CONDITIONS
MIN
TYP
15
MAX
22
UNIT
ns
t
t
t
t
t
t
Differential output delay time
d(OD)
t(OD)
PZH
PZL
R
= 54 Ω,
See Figure 3
L
Differential output transition time
Output enable time to high level
Output enable time to low level
Output disable time from high level
Output disable time from low level
20
30
ns
R
R
R
R
= 110 Ω,
= 110 Ω,
= 110 Ω,
= 110 Ω,
See Figure 4
See Figure 5
See Figure 4
See Figure 5
85
120
60
ns
L
L
L
L
40
ns
150
20
250
30
ns
PHZ
PLZ
ns
2–4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN95176B
DIFFERENTIAL BUS TRANSCEIVER
SGLS026A – MARCH 1989 – REVISED JUNE 1995
SYMBOL EQUIVALENTS
RS-422-A
DATA SHEET PARAMETER
RS-485
V
O
V
V
V V
oa, ob
oa, ob
|V
|V
|
|
V
V
o
OD1
o
V (R = 100 Ω)
V (R = 54 Ω)
t L
OD2
t
L
V (Test Termination
t
Measurement 2)
|V
|
None
OD3
∆|V
|
| |V | – |V ||
| |V – |V ||
t t
OD
t
t
V
OC
|V
os
|
|V |
os
∆|V
|
|V – V
os os
|
|V – V |
os os
OC
I
|I |, |I
|
|
None
I , I
OS
sa sb
I
O
|I |, |I
xa xb
ia ib
RECEIVER SECTION
electrical characteristics over recommended ranges of common-mode input voltage, supply
voltage, and operating free-air temperature (unless otherwise noted)
†
PARAMETER
TEST CONDITIONS
MIN TYP
MAX
UNIT
V
V
IT+
V
IT–
V
hys
V
IK
Positive-going input threshold voltage
Negative-going input threshold voltage
V
V
= 2.7 V,
= 0.5 V,
I
= –0.4 mA
= 8 mA
0.2
O
O
O
‡
–0.2
I
V
O
Input hysteresis voltage (V
Enable clamp voltage
– V
)
IT–
50
mV
V
IT+
I = –18 mA
I
–1.5
V
= 200 mV,
I
I
= –400 µA,
ID
See Figure 2
OH
V
OH
V
OL
High-level output voltage
Low-level output voltage
2.7
V
V
= –200 mV,
= 8 mA,
ID
See Figure 2
OL
0.45
V
I
High-impedance-state output current
Line input current
V
= 0.4 V to 2.4 V
±20
1
µA
mA
OZ
O
V = 12 V
Other input = 0 V,
See Note 5
I
I
I
V = –7 V
I
–0.8
20
I
I
High-level enable input current
Low-level enable input current
Input resistance
V
V
= 2.7 V
= 0.4 V
µA
µA
kΩ
mA
IH
IH
–100
IL
IL
r
V = 12 V
I
12
i
I
Short-circuit output current
–15
–85
70
OS
Outputs enabled
Outputs disabled
42
26
I
Supply current (total package)
No load
mA
CC
35
†
‡
All typical values are at V
= 5 V, T = 25°C.
A
CC
The algebraic convention, in which the less-positive (more-negative) limit is designated minimum, is used in this data sheet for common-mode
input voltage and threshold voltage levels only.
NOTE 5: This applies for both power on and power off. Refer to EIA Standard RS-485 for exact conditions.
2–5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN95176B
DIFFERENTIAL BUS TRANSCEIVER
SGLS026A – MARCH 1989 – REVISED JUNE 1995
switching characteristics, V
= 5 V, C = 15 pF, T = 25°C
L A
CC
PARAMETER
TEST CONDITIONS
MIN
TYP
21
MAX
35
UNIT
ns
t
t
t
t
t
t
Propagation delay time, low- to high-level output
Propagation delay time, high- to low-level output
Output enable time to high level
PLH
PHL
PZH
PZL
PHZ
PLZ
V
ID
= 0 to 3 V, See Figure 6
23
35
ns
10
20
ns
See Figure 7
See Figure 7
Output enable time to low level
12
20
ns
Output disable time from high level
Output disable time from low level
20
35
ns
17
25
ns
PARAMETER MEASUREMENT INFORMATION
R
L
L
2
V
ID
V
OD2
V
OH
R
2
V
OC
+I
OL
–I
OH
V
OL
Figure 1. Driver V
and V
Figure 2. Receiver V
and V
OL
OD
OC
OH
3 V
0 V
Input
1.5 V
1.5 V
C
= 50 pF
L
(see Note B)
R
= 54 Ω
L
t
t
d(OD)
d(OD)
Output
Generator
(see Note A)
50 Ω
≈ 2.5 V
90%
10%
50%
t(OD)
Output
50%
3 V
≈ – 2.5 V
t
t(OD)
t
TEST CIRCUIT
VOLTAGE WAVEFORMS
NOTES: A. The input pulse is supplied by a generator having the following characteristics: PRR ≤ 1 MHz, 50% duty cycle, t ≤ 6 ns, t ≤ 6 ns,
r
f
Z
C
= 50 Ω.
O
L
B.
includes probe and jig capacitance.
Figure 3. Driver Test Circuit and Voltage Waveforms
Output
3 V
0 V
S1
Input
1.5 V
1.5 V
0 V or 3 V
0.5 V
t
PZH
C
= 50 pF
R
= 110 Ω
L
L
V
OH
(see Note B)
Generator
(see Note A)
Output
50 Ω
2.3 V
t
V
≈ 0 V
off
PHZ
TEST CIRCUIT
VOLTAGE WAVEFORMS
NOTES: A. The input pulse is supplied by a generator having the following characteristics: PRR ≤ 1 MHz, 50% duty cycle, t ≤ 6 ns, t ≤ 6 ns,
r
f
Z
C
= 50 Ω.
O
L
B.
includes probe and jig capacitance.
Figure 4. Driver Test Circuit and Voltage Waveforms
2–6
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN95176B
DIFFERENTIAL BUS TRANSCEIVER
SGLS026A – MARCH 1989 – REVISED JUNE 1995
PARAMETER MEASUREMENT INFORMATION
5 V
3 V
0 V
Input
1.5 V
1.5 V
R
= 110 Ω
L
S1
Output
3 V or 0 V
t
PZL
t
C
= 50 pF
PLZ
L
(see Note B)
5 V
Generator
(see Note A)
50 Ω
2.3 V
0.5 V
Output
V
OL
TEST CIRCUIT
VOLTAGE WAVEFORMS
NOTES: A. The input pulse is supplied by a generator having the following characteristics: PRR ≤ 1 MHz, 50% duty cycle, t ≤ 6 ns, t ≤ 6 ns,
r
f
Z
C
= 50 Ω.
O
L
B.
includes probe and jig capacitance.
Figure 5. Driver Test Circuit and Voltage Waveforms
3 V
0 V
Input
1.5 V
1.5 V
Output
Generator
(see Note A)
51 Ω
1.5 V
0 V
C
= 15 pF
(see Note B)
L
t
t
PLH
PHL
V
OH
Output
1.3 V
1.3 V
V
OL
TEST CIRCUIT
VOLTAGE WAVEFORMS
NOTES: A. The input pulse is supplied by a generator having the following characteristics: PRR ≤ 1 MHz, 50% duty cycle, t ≤ 6 ns, t ≤ 6 ns,
r
f
Z
C
= 50 Ω.
O
L
B.
includes probe and jig capacitance.
Figure 6. Receiver Test Circuit and Voltage Waveforms
2–7
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN95176B
DIFFERENTIAL BUS TRANSCEIVER
SGLS026A – MARCH 1989 – REVISED JUNE 1995
PARAMETER MEASUREMENT INFORMATION
S1
1.5 V
S2
2 kΩ
–1.5 V
5 V
1N916 or Equivalent
5 kΩ
CL = 15 pF
(see Note B)
Generator
(see Note A)
50 Ω
S3
TEST CIRCUIT
3 V
3 V
1.5 V
S1 to –1.5 V
Input
Input
1.5 V
S1 to 1.5 V
S2 Open
S3 Closed
0 V
0 V S2 Closed
t
S3 Open
PZH
t
PZL
V
OH
≈ 4.5 V
1.5 V
Output
Input
Output
1.5 V
3 V
0 V
V
OL
3 V
S1 to 1.5 V
S2 Closed
S3 Closed
S1 to –1.5 V
S2 Closed
S3 Closed
Input
1.5 V
1.5 V
0 V
0 V
t
PHZ
t
PLZ
V
OH
≈ 1.3 V
0.5 V
Output
0.5 V
Output
V
OL
≈ 1.3 V
VOLTAGE WAVEFORMS
NOTES: A. The input pulse is supplied by a generator having the following characteristics: PRR ≤ 1 MHz, 50% duty cycle, t ≤ 6 ns, t ≤ 6 ns,
r
f
Z
C
= 50 Ω.
O
L
B.
includes probe and jig capacitance.
Figure 7. Receiver Test Circuit and Voltage Waveforms
2–8
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN95176B
DIFFERENTIAL BUS TRANSCEIVER
SGLS026A – MARCH 1989 – REVISED JUNE 1995
TYPICAL CHARACTERISTICS
DRIVER
HIGH-LEVEL OUTPUT VOLTAGE
vs
DRIVER
LOW-LEVEL OUTPUT VOLTAGE
vs
HIGH-LEVEL OUTPUT CURRENT
LOW-LEVEL OUTPUT CURRENT
5
4.5
4
5
4.5
4
V
= 5 V
V
= 5 V
CC
CC
T
A
= 25°C
T
= 25°C
A
3.5
3
3.5
3
2.5
2
2.5
2
1.5
1
1.5
1
0.5
0
0.5
0
0
20
40
60
80
100
120
0
–20
OH
–40
–60
–80
–100 –120
I
– High-Level Output Current – mA
I
– Low-Level Output Current – mA
OL
Figure 8
Figure 9
DRIVER
DIFFERENTIAL OUTPUT VOLTAGE
vs
OUTPUT CURRENT
4
3.5
3
V
T
= 5 V
CC
= 25°C
A
2.5
2
1.5
1
0.5
0
0
10 20 30 40 50 60 70 80 90 100
I
O
– Output Current – mA
Figure 10
2–9
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN95176B
DIFFERENTIAL BUS TRANSCEIVER
SGLS026A – MARCH 1989 – REVISED JUNE 1995
TYPICAL CHARACTERISTICS
RECEIVER
HIGH-LEVEL OUTPUT VOLTAGE
vs
RECEIVER
HIGH-LEVEL OUTPUT VOLTAGE
vs
FREE-AIR TEMPERATURE
HIGH-LEVEL OUTPUT CURRENT
5
5
V
= 5 V
CC
V
T
A
= 0.2 V
ID
= 25°C
4.5
4.5
V
ID
= 200 mV
I
= –440 µA
OH
4
4
3.5
3.5
3
3
2.5
2.5
V
CC
= 5.25 V
2
2
V
CC
= 5 V
1.5
1.5
V
CC
= 4.75 V
1
1
0.5
0.5
0
0
–40 –20
0
20
40
60
80
100 120
0
–5 –10 –15 –20 –25 –30 –35 –40 –45 –50
T
A
– Free-Air Temperature – °C
I
– High-Level Output Current – mA
OH
Figure 11
Figure 12
RECEIVER
RECEIVER
LOW-LEVEL OUTPUT VOLTAGE
vs
LOW-LEVEL OUTPUT VOLTAGE
vs
LOW-LEVEL OUTPUT CURRENT
FREE-AIR TEMPERATURE
0.6
0.6
0.5
0.4
0.3
0.2
0.1
0
V
T
A
= 5 V
= 25°C
CC
V
V
I
= 5 V
= –200 mV
= 8 mA
CC
ID
OL
0.5
0.4
0.3
0.2
0.1
0
0
5
10
15
20
25
30
–40 –20
0
20
40
60
80
100 120
I
– Low-Level Output Current – mA
T
A
– Free-Air Temperature – °C
OL
Figure 13
Figure 14
2–10
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN95176B
DIFFERENTIAL BUS TRANSCEIVER
SGLS026A – MARCH 1989 – REVISED JUNE 1995
TYPICAL CHARACTERISTICS
RECEIVER
OUTPUT VOLTAGE
vs
RECEIVER
OUTPUT VOLTAGE
vs
ENABLE VOLTAGE
ENABLE VOLTAGE
5
4
3
2
1
0
6
5
4
3
2
1
0
V
= –0.2 V
V
= 0.2 V
ID
Load = 1 kΩ to V
ID
Load = 8 kΩ to GND
= 25°C
V
= 5.25 V
= 4.75 V
CC
CC
T
A
T
A
= 25°C
V
= 5.25 V
= 4.75 V
CC
V
CC
V
= 5 V
CC
V
CC
= 5 V
V
CC
0
0.5
1
1.5
2
2.5
3
0
0.5
1
I(en)
1.5
2
2.5
3
V
– Enable Voltage – V
V
I(en)
– Enable Voltage – V
Figure 15
Figure 16
APPLICATION INFORMATION
SN95176B
SN95176B
R
R
T
T
Up to 32
Transceivers
Figure 17. Typical Application Circuit
NOTE A: The line should terminate at both ends in its characteristic impedance (R = Z ). Stub lengths off the main line should be kept as
T
O
short as possible.
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