SN65LBC180, SN75LBC180
LOW-POWER DIFFERENTIAL LINE DRIVER AND RECEIVER PAIRS
SLLS174B FEBRUARY 1994 REVISED JANUARY 2000
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
D
Designed for High-Speed Multipoint Data
Transmission Over Long Cables
D
Operate With Pulse Durations as Low
as 30 ns
D
Low Supply Current . . . 5 mA Max
D
Meet or Exceed the Requirements of ANSI
Standard RS-485 and ISO 8482:1987(E)
D
3-State Outputs for Party-Line Buses
D
Common-Mode Voltage Range of
7 V to 12 V
D
Thermal Shutdown Protection Prevents
Driver Damage From Bus Contention
D
Positive and Negative Output Current
Limiting
D
Pin Compatible With the SN75ALS180
description
The SN65LBC180 and SN75LBC180 differential
driver and receiver pairs are monolithic integrated
circuits designed for bidirectional data
communication over long cables that take on the
characteristics of transmission lines. They are
balanced, or differential, voltage mode devices
that meet or exceed the requirements of industry
standards ANSI RS-485 and ISO 8482:1987(E).
Both devices are designed using TI's proprietary
LinBiCMOS
TM
with the low power consumption of
CMOS and the precision and robustness of
bipolar transistors in the same circuit.
Both the SN65LBC180 and SN75LBC180
combine a differential line driver and receiver with
3-state outputs and operate from a single 5-V
supply. The driver and receiver have active-high
and active-low enables, respectively, which can
be externally connected to function as a direction
control. The driver differential outputs and the
receiver differential inputs are connected to
separate terminals for full-duplex operation and
are designed to present minimum loading to the
bus whether disabled or powered off (V
CC
= 0).
These parts feature a wide common-mode
voltage range making them suitable for
point-to-point or multipoint data-bus applications.
LinBiCMOS is a trademark of Texas Instruments Incorporated.
Copyright
2000, 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
2
3
4
5
6
7
14
13
12
11
10
9
8
NC
R
RE
DE
D
GND
GND
V
CC
V
CC
A
B
Z
Y
NC
D OR N PACKAGE
(TOP VIEW)
NC No internal connection
logic symbol
logic diagram (positive logic)
EN2
EN1
B
A
Z
Y
R
RE
D
DE
11
12
10
9
2
3
5
4
2
1
1
R
RE
D
DE
B
A
Z
Y
11
12
10
9
2
3
5
4
This symbol is in accordance with ANSI/IEEE Std 91-1984
and IEC Publication 617-12.
INPUT
D
H
L
X
ENABLE
DE
H
H
L
OUTPUTS
Y Z
H L
L H
Z Z
DRIVER
DIFFERENTIAL INPUTS
A B
VID
0.2 V
0.2 V < VID < 0.2 V
VID
0.2 V
X
Open circuit
ENABLE
RE
L
L
L
H
L
OUTPUT
R
H
?
L
Z
H
RECEIVER
H = high level, L = low level, ? = indeterminate, X = irrelevant,
Z = high impedance (off)
Function Tables
SN65LBC180, SN75LBC180
LOW-POWER DIFFERENTIAL LINE DRIVER AND RECEIVER PAIRS
SLLS174B FEBRUARY 1994 REVISED JANUARY 2000
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
description (continued)
The devices also provide positive and negative output-current limiting and thermal shutdown for protection from
line fault conditions. The line driver shuts down at a junction temperature of approximately 172
C.
The SN65LBC180 and SN75LBC180 are available in the 14-pin dual-in-line and small-outline packages. The
SN75LBC180 is characterized for operation over the commercial temperature range of 0
C to 70
C. The
SN65LBC180 is characterized over the industrial temperature range of 40
C to 85
C.
schematics of inputs and outputs
RECEIVER A INPUT
EQUIVALENT OF D, DE, AND RE INPUTS
RECEIVER B INPUT
DRIVER OUTPUT
TYPICAL OF RECEIVER OUTPUT
Output
VCC
VCC
100 k
NOM
3 k
NOM
Input
18 k
NOM
1.1 k
NOM
1.1 k
NOM
3 k
NOM
18 k
NOM
100 k
NOM
Input
VCC
Input
VCC
22 k
VCC
A Output
12 k
12 k
SN65LBC180, SN75LBC180
LOW-POWER DIFFERENTIAL LINE DRIVER AND RECEIVER PAIRS
SLLS174B FEBRUARY 1994 REVISED JANUARY 2000
3
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage range, V
CC
(see Note 1)
0.3 V to 7 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage range, V
I
(A, B)(see Note 1)
10 V to 15 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltage range at D, R, DE, RE (see Note 1)
0.3 V to V
CC
+ 0.5 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous total power dissipation (see Note 2)
Internally limited
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Total power dissipation
See Dissipation Rating Table
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range, T
A
: SN65LBC180 40
C to 85
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SN75LBC180 0
C to 70
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, T
stg
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.
NOTES:
1. All voltage values are with respect to GND.
2. The maximum operating junction temperature is internally limited. Use the dissipation rating table to operate below this temperature.
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
950 mW
7.6 mW/
C
608 mW
494 mW
N
1150 mW
9.2 mW/
C
736 mW
598 mW
recommended operating conditions
MIN
NOM
MAX
UNIT
Supply voltage, VCC
4.75
5
5.25
V
High-level input voltage, VIH
D, DE, and RE
2
V
Low-level input voltage, VIL
D, DE, and RE
0.8
V
Differential input voltage, VID
6
6
V
Voltage at any bus terminal (separately or common mode), VO, VI, or VIC
A, B, Y, or Z
7
12
V
High level output current IOH
Y or Z
60
mA
High-level output current, IOH
R
8
mA
Low level output current IOL
Y or Z
60
mA
Low-level output current, IOL
R
8
mA
Operating free air temperature TA
SN65LBC180
40
85
C
Operating free-air temperature, TA
SN75LBC180
0
70
C
The algebraic convention where the least positive (more negative) limit is designated minimum, is used in this data sheet for the differential input
voltage, voltage at any bus terminal, operating temperature, input threshold voltage, and common-mode output voltage.
SN65LBC180, SN75LBC180
LOW-POWER DIFFERENTIAL LINE DRIVER AND RECEIVER PAIRS
SLLS174B FEBRUARY 1994 REVISED JANUARY 2000
4
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
DRIVER SECTION
electrical characteristics over recommended operating conditions (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
VIK
Input clamp voltage
II = 18 mA
1.5
V
RL = 54
,
SN65LBC180
1.1
2.5
5
| VOD |
Differential output voltage magnitude
L
,
See Figure 1
SN75LBC180
1.5
2.5
5
V
| VOD |
g
g
(see Note 3)
RL = 60
,
SN65LBC180
1.1
2
5
V
L
,
See Figure 2
SN75LBC180
1.5
2
5
| VOD |
Change in magnitude of differential output
voltage (see Note 4)
See Figures 1 and 2
0.2
V
VOC
Common-mode output voltage
1
2.5
3
V
| VOC |
Change in magnitude of common-mode output
voltage (see Note 4)
RL = 54
,
See Figure 1
0.2
V
IO
Output current with power off
VCC = 0,
VO = 7 V to 12 V
100
A
IOZ
High-impedance-state output current
VO = 7 V to 12 V
100
A
IIH
High-level input current
VI = 2.4 V
100
A
IIL
Low-level input current
VI = 0.4 V
100
A
IOS
Short-circuit output current
7 V
VO
12 V
250
mA
ICC
Supply current
Receiver disabled
Outputs enabled
5
mA
ICC
Supply current
Receiver disabled
Outputs disabled
3
mA
All typical values are at VCC = 5 V and TA = 25
C.
NOTES:
3. The minimum VOD specification of the SN65LBC180 may not fully comply with ANSI RS-485 at operating temperatures below 0
C.
System designers should take the possibly lower output signal into account in determining the maximum signal-transmission
distance.
4.
| VOD | and
| VOC | are the changes in the steady-state magnitude of VOD and VOC, respectively, that occur when the input is
changed from a high level to a low level.
switching characteristics, V
CC
= 5 V, T
A
= 25
C
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
td(OD)
Differential output delay time
RL = 54
See Figure 3
7
12
18
ns
tt(OD)
Differential output transition time
RL = 54
,
See Figure 3
5
10
20
ns
tPZH
Output enable time to high level
RL = 110
,
See Figure 4
35
ns
tPZL
Output enable time to low level
RL = 110
,
See Figure 5
35
ns
tPHZ
Output disable time from high level
RL = 110
,
See Figure 4
50
ns
tPLZ
Output disable time from low level
RL = 110
,
See Figure 5
35
ns
SN65LBC180, SN75LBC180
LOW-POWER DIFFERENTIAL LINE DRIVER AND RECEIVER PAIRS
SLLS174B FEBRUARY 1994 REVISED JANUARY 2000
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
RECEIVER SECTION
electrical characteristics over recommended operating conditions (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
VIT +
Positive-going input threshold voltage
IO = 8 mA
0.2
V
VIT
Negative-going input threshold voltage
IO = 8 mA
0.2
V
Vhys
Hysteresis voltage ( VIT + VIT )
45
mV
VIK
Enable-input clamp voltage
II = 18 mA
1.5
V
VOH
High-level output voltage
VID = 200 mV,
IOH = 8 mA
3.5
4.5
V
VOL
Low-level output voltage
VID = 200 mV,
IOL = 8 mA
0.3
0.5
V
IOZ
High-impedance-state output current
VO = 0 V to VCC
20
A
IIH
High-level enable-input current
VIH = 2.4 V
50
A
IIL
Low-level enable-input current
VIL = 0.4 V
100
A
VI = 12 V,
Other input at 0 V
VCC = 5 V,
0.7
1
II
Bus input current
VI = 12 V,
Other input at 0 V
VCC = 0 V,
0.8
1
mA
II
Bus input current
VI = 7 V,
Other input at 0 V
VCC = 5 V,
0.5
0.8
mA
VI = 7 V,
Other input at 0 V
VCC = 0 V,
0.5
0.8
ICC
Supply current
Driver disabled
Outputs enabled
5
mA
ICC
Supply current
Driver disabled
Outputs disabled
3
mA
switching characteristics, V
CC
= 5 V, T
A
= 25
C
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
tPHL
Propagation delay time, high- to low-level output
11
22
33
ns
tPLH
Propagation delay time, low- to high-level output
V
1 5 V to 1 5 V
See Figure 6
11
22
33
ns
tsk(p)
Pulse skew (
tPHL tPLH
)
VID = 1.5 V to 1.5 V,
See Figure 6
3
6
ns
tt
Transition time
5
8
ns
tPZH
Output enable time to high level
35
ns
tPZL
Output enable time to low level
See Figure 7
30
ns
tPHZ
Output disable time from high level
See Figure 7
35
ns
tPLZ
Output disable time from low level
30
ns
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