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Электронный компонент: SN65LBC179D

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SN75LBC179, SN65LBC179, SN65LBC179Q
LOW-POWER DIFFERENTIAL LINE DRIVER AND RECEIVER PAIRS
SLLS173C JANUARY 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 Widths as Low
as 30 ns
D
Low Supply Current . . . 5 mA Max
D
Meets or Exceeds the Standard
Requirements of ANSI RS-485 and
ISO 8482:1987(E)
D
Common-Mode Voltage Range of 7 V
to 12 V
D
Positive- and Negative-Output Current
Limiting
D
Driver Thermal Shutdown Protection
D
Pin Compatible With the SN75179B
description
The SN65LBC179, SN65LBC179Q, and
SN75LBC179 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.
The SN65LBC179, SN65LBC179Q, and
SN75LBC179 combine a differential line driver
and differential line receiver and operate from a
single 5-V supply. 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 when 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. The devices also
provide positive- and negative-current limiting
and thermal shutdown for protection from line fault
conditions. The line driver shuts down at a junction
temperature of approximately 172
C.
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.
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.
LinBiCMOS is a trademark of Texas Instruments Incorporated.
logic symbol
logic diagram (positive logic)
Y
Z
B
A
R
D
5
6
7
8
2
3
R
D
B
A
Z
Y
7
8
6
5
2
3
This symbol is in accordance with ANSI/IEEE Std 91-1984
and IEC Publication 617-12.
INPUT
D
OUTPUTS
Y Z
DRIVER
DIFFERENTIAL INPUTS
A B
VID
0.2 V
0.2 V < VID < 0.2 V
VID
0.2 V
Open circuit
OUTPUT
R
H
?
L
H
RECEIVER
H = high level,
L = low level,
? = indeterminate
Function Tables
1
2
3
4
8
7
6
5
V
CC
R
D
GND
A
B
Z
Y
D OR P PACKAGE
(TOP VIEW)
H
L
H
L
L
H
SN75LBC179, SN65LBC179, SN65LBC179Q
LOW-POWER DIFFERENTIAL LINE DRIVER AND RECEIVER PAIRS
SLLS173C JANUARY 1994 REVISED JANUARY 2000
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
description (continued)
The SN65LBC179, SN65LBC179Q, and SN75LBC179 are available in the 8-pin dual-in-line and small-outline
packages. The SN75LBC179 is characterized for operation over the commercial temperature range of 0
C to
70
C. The SN65LBC179 is characterized over the industrial temperature range of 40
C to 85
C. The
SN65LBC179Q is characterized over the extended industrial or automotive temperature range of 40
C to
125
C.
schematics of inputs and outputs
RECEIVER A INPUT
EQUIVALENT OF DRIVER INPUT
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
R Output
12 k
12 k
SN75LBC179, SN65LBC179, SN65LBC179Q
LOW-POWER DIFFERENTIAL LINE DRIVER AND RECEIVER PAIRS
SLLS173C JANUARY 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
0.3 V to 7 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltage range at A, B, Y, or Z (see Note 1)
10 V to 15 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltage range at D or R (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
: SN65LBC179 40
C to 85
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SN65LBC179Q 40
C to 125
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
SN75LBC179 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. Uses 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
725 mW
5.8 mW/
C
464 mW
377 mW
P
1100 mW
8.8 mW/
C
704 mW
572 mW
recommended operating conditions
MIN
NOM
MAX
UNIT
Supply voltage, VCC
4.75
5
5.25
V
High-level input voltage, VIH
D
2
V
Low-level input voltage, VIL
D
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
SN65LBC179
40
85
Operating free-air temperature, TA
SN65LBC179Q
40
125
C
SN75LBC179
0
70
The algebraic convention, in which the least positive (most negative) limit is designated as minimum, is used in this data sheet for differential
input voltage, voltage at any bus terminal (separately or common mode), operating temperature, input threshold voltage, and common-mode
output voltage.
SN75LBC179, SN65LBC179, SN65LBC179Q
LOW-POWER DIFFERENTIAL LINE DRIVER AND RECEIVER PAIRS
SLLS173C JANUARY 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
,
See Figure 1
SN65LBC179,
SN65LBC179Q
1.1
2.2
5
| VOD |
Differential output voltage (see Note 3)
See Figure 1
SN75LBC179
1.5
2.2
5
V
| VOD |
Differential output voltage (see Note 3)
RL = 60
,
See Figure 2
SN65LBC179,
SN65LBC179Q
1.1
2.2
5
V
See Figure 2
SN75LBC179
1.5
2.2
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
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
No load
SN65LBC179,
SN75LBC179
4.2
5
mA
CC
y
SN65LBC179Q
4.2
7
mA
All typical values are at VCC = 5 V and TA = 25
C.
NOTES:
3. The minimum VOD specification of the SN65179 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
MAX
UNIT
td(OD)
Differential-output delay time
RL = 54
See Figure 3
7
18
ns
tt(OD)
Differential transition time
RL = 54
,
See Figure 3
5
20
ns
SN75LBC179, SN65LBC179, SN65LBC179Q
LOW-POWER DIFFERENTIAL LINE DRIVER AND RECEIVER PAIRS
SLLS173C JANUARY 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
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 = 16 mA
0.3
0.5
V
VI = 12 V,
Other inputs at 0 V,
SN65LBC179,
SN75LBC179
0.7
1
mA
VCC = 5 V
SN65LBC179Q
0.7
1.2
mA
VI = 12 V,
Other inputs at 0 V,
SN65LBC179,
SN75LBC179
0.8
1
mA
II
Bus input current
VCC = 0 V
SN65LBC179Q
0.8
1 .2
mA
II
Bus input current
VI = 7 V,
Other inputs at 0 V,
SN65LBC179,
SN75LBC179
0.5
0.8
mA
VCC = 5 V
SN65LBC179Q
0.5
1.0
mA
VI = 7 V,
Other inputs at 0 V,
SN65LBC179,
SN75LBC179
0.5
0.8
mA
VCC = 0 V
SN65LBC179Q
0.5
1.0
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
VID = 1 5 V to 1 5 V
See Figure 4
15
30
ns
tPLH
Propagation delay time, low- to high-level output
VID = 1.5 V to 1.5 V,
See Figure 4
15
30
ns
tsk(p)
Pulse skew (
tPHL tPLH
)
See Figure 4
3
6
ns
tt
Transition time
See Figure 4
3
5
ns
PARAMETER MEASUREMENT INFORMATION
VOD
RL
2
0 V or 3 V
Z
D
Y
RL
2
VOC
Figure 1. Differential and Common-Mode Output Voltage Test Circuit