SN65LBC182
SN75LBC182
SLLS500A - MAY 2001 - REVISED MARCH 2005
DIFFERENTIAL BUS TRANSCEIVER
A
DE
B
RE
D
R
functional block diagram
3
4
2
1
6
7
1
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FEATURES
D
One-Fourth Unit Load Allows up to 128
Devices on a Bus
D
ESD Protection for Bus Terminals:
-
15-kV Human Body Model
-
8-kV IEC61000-4-2, Contact Discharge
-
15-kV IEC61000-4-2, Air-Gap Discharge
D
Meets or Exceeds the Requirements of ANSI
Standard TIA/EIA-485-A and ISO 8482: 1987(E)
D
Controlled Driver Output-Voltage Slew Rates
Allow Longer Cable Stub Lengths
D
Designed for Signaling Rates
Up to 250-kbps
D
Low Disabled Supply Current . . . 250
A Max
D
Thermal Shutdown Protection
D
Open-Circuit Fail-Safe Receiver Design
D
Receiver Input Hysteresis . . . 70 mV Typ
D
Glitch-Free Power-Up and Power-Down
Protection
APPLICATIONS
D
Utility Meters
D
Industrial Process Control
D
Building Automation
DESCRIPTION
The SN65LBC182 and SN75LBC182 are differential
data line transceivers with a high level of ESD protection
in the trade-standard footprint of the SN75176. They are
designed for balanced transmission lines and meet
ANSI standard TIA/EIA-485-A and ISO 8482. The
SN65LBC182 and SN75LBC182 combine a 3-state,
differential line driver and 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, which can be externally
connected together to function as a direction control.
The driver outputs and the receiver inputs connect
internally to form a differential input/output (I/O) bus port
that is designed to offer minimum loading to the bus.
This port operates over a wide range of common-mode
voltage, making the device suitable for party-line
applications. The device also includes additional
features for party-line data buses in electrically noisy
environment applications such as industrial process
control or power inverters.
The SN75LBC182 and SN65LBC182 bus pins also
exhibit a high input resistance equivalent to one-fourth
unit load allowing connection of up to 128 similar
devices on the bus. The high ESD tolerance protects
the device for cabled connections. (For an even higher
level of protection, see the SN65/75LBC184, literature
number SLLS236.)
The differential driver design incorporates
slew-rate-controlled outputs sufficient to transmit data
up to 250 kbps. Slew-rate control allows longer
unterminated cable runs and longer stub lengths from
the main backbone than possible with uncontrolled
voltage transitions. The receiver design provides a
fail-safe output of a high level when the inputs are left
floating (open circuit). Very low device supply current
can be achieved by disabling the driver and the receiver.
The SN65LBC182 is characterized for operation from
-40
C to 85
C, and the SN75LBC182 is characterized
for operation from 0
C to 70
C.
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.
The signaling rate of a line, is the number of voltage transitions that are made per second expressed in the units bps (bits per second).
Copyright
2001, Texas Instruments Incorporated
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.
SN65LBC182
SN75LBC182
SLLS500A - MAY 2001 - REVISED MARCH 2005
2
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schematic of inputs and outputs
A Port
Only
12
A
Nominal
A or B
I/O
B Port
Only
12
A
Nominal
72 k
16 k
16 k
VCC
1
2
3
4
5
6
7
8
A
R
B
DE
GND
D
RE
VCC
SN65LBC182D (Marked as 6LB182)
SN75LBC182D (Marked as 7LB182)
SN65LBC182P (Marked as 65LBC182)
SN75LBC182P (Marked as 75LBC182)
(TOP VIEW)
Function Tables
DRIVER
INPUT
D
ENABLE
DE
OUTPUTS
INPUT
D
ENABLE
DE
A
B
H
H
H
L
L
H
L
H
X
L
Z
Z
Open
H
H
L
RECEIVER
DIFFERENTIAL
INPUTS
ENABLE
RE
OUTPUT
R
VID
0.2 V
-0.2V
<
VID
<
0.2 V
VID
-0.2 V
X
Open
L
L
L
H
L
H
?
L
Z
H
AVAILABLE OPTIONS
PACKAGE
TA
PLASTIC SMALL-OUTLINE
(JEDEC MS-012)
PLASTIC DUAL-IN-LINE PACKAGE
(JEDEC MS-001)
0
C to 70
C
SN75LBC182D
SN75LBC182P
- 40
C to 85
C
SN65LBC182D
SN65LBC182P
Add R suffix for taped and reel.
For the most current package and ordering information, see the Package Option Addendum at the end of this document,
or see the TI web site at www.ti.com.
SN65LBC182
SN75LBC182
SLLS500A - MAY 2001 - REVISED MARCH 2005
3
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absolute maximum ratings
over operating free-air temperature range unless otherwise noted
Supply voltage range, (see Note 1) V
CC
-0.5 V to 7 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltage range at any bus terminal (A or B)
-15 V to 15 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage, V
I
(D, DE, R or RE)
-0.3 V to 7 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Receiver output current, I
O
20 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrostatic discharge: Human body model (see Note 2)
A, B, GND
15 kV
. . . . . . . . . . . . . . . . . . . . . .
All pins
3 kV
. . . . . . . . . . . . . . . . . . . . . . . . . .
Contact discharge (IEC61000-4-2)
A, B, GND
8 kV
. . . . . . . . . . . . . . . . . . . . . . .
Air discharge (IEC61000-4-2)
A, B, GND
15 kV
. . . . . . . . . . . . . . . . . . . . . .
Continuous total power dissipation
See Dissipation Rating Table
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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. All voltage values, except differential I/O bus voltages, are with respect to network ground terminal.
2. Tested in accordance with JEDEC Standard 22, Test Method A114-A.
DISSIPATION RATING TABLE
PACKAGE
TA
25
C
POWER RATING
DERATING FACTOR
ABOVE TA = 25
C
TA = 70
C
POWER RATING
TA = 85
C
POWER RATING
D
725 mW
5.8 mW/
C
464 mW
377 mW
P
1150 mW
9.2 mW/
C
736 mW
598 mW
This is the inverse of the junction-to-ambient thermal resistance when board-mounted and with no air flow.
NOTE: The maximum operating junction temperature is internally limited. Use the dissipation rating table
to operate below this temperature
recommended operating conditions
MIN
NOM
MAX
UNIT
Supply voltage, VCC
4.75
5
5.25
V
Voltage at any bus I/O terminal (separately or common mode) VI or VIC
-7
12
V
High-level input voltage, VIH
D, DE, RE
2
V
Low-level input voltage, VIL
D, DE, RE
0.8
V
Differential input voltage, VID (see Note 3)
-12
12
V
Output current, IO
Driver
-60
60
mA
Output current, IO
Receiver
-8
4
mA
Operating free-air temperature, TA
SN65LBC182
-40
85
C
Operating free-air temperature, TA
SN75LBC182
0
70
C
NOTE 3: Differential input/output bus voltage is measured at the noninverting terminal A with respect to the inverting terminal B.
SN65LBC182
SN75LBC182
SLLS500A - MAY 2001 - REVISED MARCH 2005
4
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driver electrical characteristics over recommended operating conditions
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
VIK
Input clamp voltage
II = -18 mA
-1.5
V
VO
Output voltage
IO = 0
0
VCC
V
|VOD|
Differential output voltage
RL = 54
,
See Figure 1
1.5
2.2
VCC
V
|VOD|
Differential output voltage
Vtest = -7 V to 12 V,
See Figure 2
1.5
2.2
VCC
V
VOD
Change in magnitude of differential output voltage
See Figure 1
-0.2
0.2
VOC(SS)
Steady-state common-mode output voltage
See Figure 1
1
3
V
VOC(SS)
Change in steady-state common-mode output
voltage
See Figures 1 and 4
-0.2
0.2
V
VOC(PP)
Peak-to-peak change in common-mode output
voltage during state transitions
See Figures 1 and 4
0.8
V
IOZ
High-impedance output current
See receiver input currents
IIH
High-level input current (D, DE)
VI = 2.4 V
50
A
IIL
Low-level input current (D, DE)
VI = 0.4 V
-50
A
IOS
Short-circuit output current
VO = -7 V to 12 V
-250
250
mA
ICC
Supply current
SN75LBC182
No load, DE at VCC,
RE at VCC
12
25
mA
ICC
Supply current
SN65LBC182
No load, DE at VCC,
RE at VCC
12
30
mA
All typical values are at VCC = 5 V and TA = 25
C.
driver switching characteristics over recommended operating conditions (unless otherwise
noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
tr
Differential output signal rise time
0.25
0.72
1.2
tf
Differential output signal fall time
RL = 54
,
CL = 50 pF,
0.25
0.73
1.2
tPLH
Propagation delay time, low-to-high-level output
RL = 54
,
See Figure 3
CL = 50 pF,
1.3
s
tPHL
Propagation delay time, high-to-low-level output
See Figure 3
1.3
s
tsk(p)
Pulse skew (tPHL - tPLH)
0.075
0.15
tPZH
Output enable time to high level
RL = 110
,
See Figure 5
3.5
s
tPHZ
Output disable time from high level
RL = 110
,
See Figure 5
3.5
s
tPZL
Output enable time to low level
RL = 110
,
See Figure 6
3.5
s
tPLZ
Output disable time from low level
RL = 110
,
See Figure 6
3.5
s
SN65LBC182
SN75LBC182
SLLS500A - MAY 2001 - REVISED MARCH 2005
5
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receiver electrical characteristics over recommended operating conditions (unless otherwise
noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
VIT+
Positive-going input threshold voltage
0.2
V
VIT-
Negative-going input threshold voltage
-0.2
V
Vhys
Hysteresis voltage (VIT+ - VIT-)
70
mV
VIK
Enable-input clamp voltage
II = -18 mA
-1.5
V
VOH
High-level output voltage
VID = 200 mV, IO = -8 mA,
See Figure 7
2.8
V
VOL
Low-level output voltage
VID = 200 mV, IO = 4 mA,
See Figure 7
0.4
V
IOZ
High-impedance-state output current
VO = 0.4 to 2.4 V
1
A
VIH = 12 V, VCC = 5 V
250
II
Bus input current
VIH = 12 V, VCC = 0 V
Other input at 0 V
250
A
II
Bus input current
VIH = -7 V, VCC = 5 V
Other input at 0 V
-200
A
VIH = -7 V, VCC = 0 V
-200
IIH
High-level input current (RE)
VIH = 2 V
50
A
IIL
Low-level input current (RE)
VIL = 0.8 V
-50
A
ICC
Supply current
No load
DE at 0 V, RE at 0 V
3.5
mA
ICC
Supply current
No load
DE at 0 V, RE at VCC
175
250
A
All typical values are at VCC = 5 V and TA = 25
C.
receiver switching characteristics over recommended operating conditions (unless otherwise
noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
tr
Differential output signal rise time
20
tf
Differential output signal fall time
CL = 50 pF,
See Figure 7
20
ns
tPLH
Propagation delay time, low-to-high-level output
CL = 50 pF,
See Figure 7
150
ns
tPHL
Propagation delay time, high-to-low-level output
150
tPZH
Output enable time to high level
100
ns
tPZL
Output enable time to low level
See Figure 8
100
ns
tPHZ
Output disable time from high level
See Figure 8
100
ns
tPLZ
Output disable time from low level
100
ns
tsk(p)
Pulse skew
tPHL - tPLH
50
ns
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