Document Outline
- features
- description
- logic symbol
- logic diagram (positive logic)
- schematic diagrams of inputs and outputs
- absolute maximum ratings over operating free-air temperature (unless ot\
herwise noted)
- recommended operating conditions
- electrical characteristics over recommended ranges of supply voltage and\
operating free-air temperature (unless otherwise noted)
- switching characteristics, V switching characteristics, V CC = 5 V
- PARAMETER MEASUREMENT INFORMATION
- TYPICAL CHARACTERISTICS
- TYPICAL CHARACTERISTICS
- MECHANICAL DATA
- FK (S-CQCC-N**) LEADLESS CERAMIC CHIP CARRIER
- J (R-GDIP-T**) CERAMIC DUAL-IN-LINE PACKAGE
- W (R-GDFP-F16) CERAMIC DUAL FLATPACK
- IMPORTANT NOTICE
SN55LBC172
QUADRUPLE LOW-POWER DIFFERENTIAL LINE DRIVER
SGLS084C MARCH 1995 REVISED JANUARY 2003
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
D
Meets Standard EIA-485
D
Designed for High-Speed Multipoint
Transmission on Long Bus Lines in Noisy
Environments
D
Supports Data Rates up to and Exceeding
Ten Million Transfers Per Second
D
Common-Mode Output Voltage Range of
7 V to 12 V
D
Positive- and Negative-Current Limiting
D
Low Power Consumption . . . 1.5 mA Max
(Output Disabled)
description
The SN55LBC172 is a monolithic quadruple
differential line driver with 3-state outputs. This
device is designed to meet the requirements of the
Electronics Industry Association (EIA) standard
RS-485. The SN55LBC172 is optimized for
balanced multipoint bus transmission at data
rates up to and exceeding 10 million bits per
second. The driver features wide positive and
negative common-mode output voltage ranges,
current limiting, and thermal-shutdown circuitry,
making it suitable for party-line applications in
noisy environments. The device is designed using
the LinBiCMOS
process, facilitating ultralow
power consumption and inherent robustness.
The SN55LBC172 provides positive- and negative-current limiting and thermal shutdown for protection from
line fault conditions on the transmission bus line. This device offers optimum performance when used with the
SN55LBC173M quadruple line receiver.
ORDERING INFORMATION
TA
PACKAGE
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
LCCC FK
Tube
SNJ55LBC172FK
SNJ55LBC172FK
55
C to 125
C
CDIP J
Tube
SNJ55LBC172J
SNJ55LBC172J
CFP W
Tube
SNJ55LBC172W
SNJ55LBC172W
Package drawings, standard packing quantities, thermal data, symbolization, and PCB design
guidelines are available at www.ti.com/sc/package.
Copyright
19952003, 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
8
16
15
14
13
12
11
10
9
1A
1Y
1Z
G
2Z
2Y
2A
GND
V
CC
4A
4Y
4Z
G
3Z
3Y
3A
J OR W PACKAGE
(TOP VIEW)
NC No internal connection
FK PACKAGE
(TOP VIEW)
19
20
1
3
2
17
18
16
15
14
13
12
11
9
10
5
4
6
7
8
4Y
4Z
NC
G
3Z
1Z
G
NC
2Z
2Y
1Y
1A
NC
4A
GND
NC
3A
3Y
2A
V
CC
LinBiCMOS is a trademark of 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.
SN55LBC172
QUADRUPLE LOW-POWER DIFFERENTIAL LINE DRIVER
SGLS084C MARCH 1995 REVISED JANUARY 2003
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
FUNCTION TABLE
(each driver)
INPUT
ENABLES
OUTPUTS
A
G
G
Y
Z
H
H
X
H
L
L
H
X
L
H
H
X
L
H
L
L
X
L
L
H
X
L
H
Z
Z
H = high level, L = low level, X = irrelevant,
Z = high impedance (off)
logic symbol
4A
3A
2A
1A
G
G
4Z
4Y
3Z
3Y
2Z
2Y
1Z
1Y
13
14
11
10
5
6
3
2
15
9
7
1
12
4
1
EN
This symbol is in accordance with ANSI/IEEE Std 91-1984
and IEC Publication 617-12.
Pin numbers shown are for the J or W package.
logic diagram (positive logic)
4A
3A
2A
1A
G
G
15
9
7
1
12
4
4Z
4Y
3Z
3Y
2Z
2Y
1Z
1Y
13
14
11
10
5
6
3
2
4A
3A
2A
1A
G
G
15
9
7
1
12
4
4Z
4Y
3Z
3Y
2Z
2Y
1Z
1Y
13
14
11
10
5
6
3
2
SN55LBC172
QUADRUPLE LOW-POWER DIFFERENTIAL LINE DRIVER
SGLS084C MARCH 1995 REVISED JANUARY 2003
3
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
schematic diagrams of inputs and outputs
Input
50
A
VCC
Driver
Output
VCC
200
ALL INPUTS
Y OR Z OUTPUT
+
SN55LBC172
QUADRUPLE LOW-POWER DIFFERENTIAL LINE DRIVER
SGLS084C MARCH 1995 REVISED JANUARY 2003
4
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
absolute maximum ratings over operating free-air temperature (unless otherwise noted)
Supply voltage range, V
CC
(see Note 1)
0.3 V to 7 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output voltage range, V
O
10 V to 15 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage range, V
I
0.3 V to 7 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous power dissipation
Internally limited
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range, T
A
55
C to 125
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, T
stg
65
C to 150
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds
65
C to 150
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.
The maximum operating junction temperature is internally limited. Use the dissipation rating table to operate below this temperature.
NOTE 1: All voltage values are with respect to GND.
DISSIPATION RATING TABLE
PACKAGE
TA
25
C
POWER RATING
DERATING FACTOR
ABOVE TA=125
C
TA = 125
C
POWER RATING
FK
1375 mW
11.0 mW/
C
275 mW
J
1375 mW
11.0 mW/
C
275 mW
W
1000 mW
8.0 mW/
C
200 mW
recommended operating conditions
MIN
NOM
MAX
UNIT
Supply voltage, VCC
4.75
5
5.25
V
High-level input voltage, VIH
2
V
Low-level input voltage, VIL
0.8
V
Output voltage at any bus terminal (separately or common mode) VO
Y or Z
12
V
Output voltage at any bus terminal (separately or common mode), VO
Y or Z
7
V
High-level output current, IOH
Y or Z
60
mA
Low-level output current, IOL
Y or Z
60
mA
Continuous total power dissipation
See Dissipation Rating Table
Operating free-air temperature, TA
55
125
C
SN55LBC172
QUADRUPLE LOW-POWER DIFFERENTIAL LINE DRIVER
SGLS084C MARCH 1995 REVISED JANUARY 2003
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
electrical characteristics over recommended ranges of supply voltage and operating free-air
temperature (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
VIK
Input clamp voltage
II = 18 mA
1.5
V
|VOD|
Differential output voltage
RL = 54
,
See Figure 1
1.1
1.8
5
V
|VOD|
Differential output voltage
RL = 60
,
See Figure 2
1.1
1.7
5
V
|VOD|
Change in magnitude of differential output voltage
0.2
V
VOC
Common mode output voltage
RL = 54
See Figure 1
3
V
VOC
Common-mode output voltage
RL = 54
,
See Figure 1
1
V
|VOC|
Change in magnitude of common-mode output voltage
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
VO
=
7 V to 12 V
250
mA
ICC
Supply current (all drivers)
No load
Outputs enabled
7
mA
ICC
Supply current (all drivers)
No load
Outputs disabled
1.5
mA
All typical values are at VCC = 5 V and TA = 25
C.
The minimum VOD specification does not fully comply with EIA-485 at operating temperatures below 0
C. The lower output signal should be used
to determine the maximum signal transmission distance.
|VOD| and
|VOC| are the changes in 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
PARAMETER
TEST CONDITIONS
TA
MIN
TYP
MAX
UNIT
td(OD) Differential output delay time
RL = 54
See Figure 3
25
C
2
11
20
ns
td(OD) Differential output delay time
RL = 54
,
See Figure 3
55
C to 125
C
2
40
ns
tt(OD)
Differential output transition time
RL = 54
See Figure 3
25
C
10
15
25
ns
tt(OD)
Differential output transition time
RL = 54
,
See Figure 3
55
C to 125
C
4
60
ns
tPZH
Output enable time to high level
RL = 110
See Figure 4
25
C
30
ns
tPZH
Output enable time to high level
RL = 110
,
See Figure 4
55
C to 125
C
40
ns
tPZL
Output enable time to low level
RL = 110
See Figure 5
25
C
30
ns
tPZL
Output enable time to low level
RL = 110
,
See Figure 5
55
C to 125
C
40
ns
tPHZ
Output disable time from high level
RL = 110
See Figure 4
25
C
60
ns
tPHZ
Output disable time from high level
RL = 110
,
See Figure 4
55
C to 125
C
115
ns
tPLZ
Output disable time from low level
RL = 110
See Figure 5
25
C
30
ns
tPLZ
Out ut disable time from low level
RL = 110
,
See Figure 5
55
C to 125
C
55
ns
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