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Электронный компонент: SN75LBC179A

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SN65LBC179A, SN75LBC179A
LOW-POWER DIFFERENTIAL LINE DRIVER AND RECEIVER PAIRS
SLLS377C MAY 2000 REVISED JUNE 2001
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
D
High-Speed Low-Power LinBiCMOS
Circuitry Designed for Signaling Rates
of
up to 30 Mbps
D
Bus-Pin ESD Protection Exceeds 12 kV
HBM
D
Very Low Disabled Supply-Current
Requirements . . . 700
A Max
D
Common-Mode Voltage Range of 7 V
to 12 V
D
Low Supply Current . . . 15 mA Max
D
Compatible With ANSI Standard
TIA/EAI-485-A and ISO8482: 1987(E)
D
Positive and Negative Output Current
Limiting
D
Driver Thermal Shutdown Protection
description
The SN65LBC179A and SN75LBC179A
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 are compatible with ANSI standard
TIA/EIA-485-A and ISO 8482:1987(E). The A
version offers improved switching performance
over its predecessors without sacrificing
significantly more power.
The SN65LBC179A and SN75LBC179A combine
a differential line driver and differential input 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 positive and negative 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 SN65LBC179A is characterized over the industrial temperature range of 40
C to 85
C. The
SN75LBC179A is characterized for operation over the commercial temperature range of 0
C to 70
C.
Signaling rate by TIA/EIA-485-A definition restrict transition times to 30% of the bit length, and much higher signaling rates may be achieved
without this requirement as displayed in the TYPICAL CHARACTERISTICS of this device.
Copyright
2001, 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.
logic diagram (positive logic)
R
D
B
A
Z
Y
7
8
6
5
2
3
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
SN65LBC179AD (Marked as BL179A)
SN65LBC179AP (Marked as 65LBC179A)
SN75LBC179AD (Marked as LB179A)
SN75LBC179AP (Marked as 75LBC179A)
(TOP VIEW)
H
L
Open
H
L
H
L
H
L
SN65LBC179A, SN75LBC179A
LOW-POWER DIFFERENTIAL LINE DRIVER AND RECEIVER PAIRS
SLLS377C MAY 2000 REVISED JUNE 2001
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
AVAILABLE OPTIONS
PACKAGE
TA
SMALL OUTLINE
(D)
PLASTIC
DUAL-IN-LINE
0
C to 70
C
SN75LBC179AD
SN75LBC179AP
40
C to 85
C
SN65LBC179AD
SN65LBC179AP
schematics of inputs and outputs
1 k
8 V
Input
VCC
Input
100 k
4 k
18 k
4 k
16 V
16 V
Input
100 k
4 k
18 k
4 k
16 V
16 V
VCC
VCC
16 V
16 V
Output
VCC
Output
VCC
D Inputs
A Input
B Input
Y AND Z Outputs
R Output
40
8 V
100 k
Receiver
Receiver
SN65LBC179A, SN75LBC179A
LOW-POWER DIFFERENTIAL LINE DRIVER AND RECEIVER PAIRS
SLLS377C MAY 2000 REVISED JUNE 2001
3
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
absolute maximum ratings
Supply voltage range, V
CC
(see Note 1)
0.3 V to 6 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
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrostatic discharge: Bus terminals and GND, Class 3, A: (see Note 2)
12 kV
. . . . . . . . . . . . . . . . . . . . . . . .
Bus terminals and GND, Class 3, B: (see Note 2)
400 V
. . . . . . . . . . . . . . . . . . . . . . . .
All terminals, Class 3, A:
4 kV
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
All terminals, Class 3, B:
400 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous total power dissipation (see Note 3)
Internally limited
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Total power dissipation
See Dissipation Rating Table
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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, except differential I/O bus voltages, are with respect to GND.
2. Tested in accordance with MILSTD883C, Method 3015.7
3. 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
8.08 mW/
C
640 mW
520 mW
This is the inverse of the junction-to-ambient thermal resistance when board-mounted and with no air flow.
recommended operating conditions
MIN
NOM
MAX
UNIT
Supply voltage, VCC
4.75
5
5.25
V
High-level input voltage, VIH
D
2
VCC
V
Low-level input voltage, VIL
D
0
0.8
V
Differential input voltage, VID (see Note 4)
12
12
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
SN65LBC179A
40
85
C
Operating free-air temperature, TA
SN75LBC179A
0
70
C
The algebraic convention, in which the least positive (most negative) limit is designated as minimum, is used in this data sheet.
NOTE 4: Differential input/output bus voltage is measured at the noninverting terminal with respect to the inverting terminal.
SN65LBC179A, SN75LBC179A
LOW-POWER DIFFERENTIAL LINE DRIVER AND RECEIVER PAIRS
SLLS377C MAY 2000 REVISED JUNE 2001
4
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
driver 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
0.8
V
RL = 54
,
SN65LBC179A
1
1.5
3
L
,
See Figure 1
SN75LBC179A
1.1
1.5
3
| VOD |
Differential output voltage
RL = 60
,
7 <V( ) < 12
SN65LBC179A
1
1.5
3
V
7 <V(tot) < 12,
See Figure 2
SN75LBC179A
1.1
1.5
3
| VOD |
Change in magnitude of differential
output voltage (see Note 5)
See Figures 1 and 2
0.2
0.2
V
VOC(SS)
Steady-state common-mode output voltage
1.8
2.4
2.8
V
VOC (SS)
Change in steady-state common-mode output
voltage (see Note 5)
See Figure 1
0.1
0.1
V
IO
Output current with power off
VCC = 0,
VO = 7 V to 12 V
10
1
10
A
IIH
High-level input current
VI = 2.V
100
A
IIL
Low-level input current
VI = 0.8 V
100
A
IOS
Short-circuit output current
7 V
VO
12 V
250
70
250
mA
ICC
Supply current
No load,
VI = 0 or VCC
8.5
15
mA
All typical values are at VCC = 5 V, TA = 25
C.
NOTE 5:
| 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.
driver switching characteristics over recommended operating conditions (unless otherwise
noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
tPLH
Propagation delay time, low-to-high-level output
2
6
12
ns
tPHL
Propagation delay time, high-to-low-level output
R
54
C
50 F
2
6
12
ns
tsk(p)
Pulse skew ( | tPHL tPLH | )
RL = 54
,
See Figure 3
CL = 50 pF,
0.3
1
ns
tr
Differential output signal rise time
See Figure 3
4
7.5
11
ns
tf
Differential output signal fall time
4
7.5
11
ns
SN65LBC179A, SN75LBC179A
LOW-POWER DIFFERENTIAL LINE DRIVER AND RECEIVER PAIRS
SLLS377C MAY 2000 REVISED JUNE 2001
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
RECEIVER SECTION
receiver 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 )
IO = 8 mA
50
mV
VOH
High-level output voltage
VID = 200 mV, IOH = 8 mA, See Figure 1
4
4.9
V
VOL
Low-level output voltage
VID = 200 mV, IOL = 8 mA, See Figure 1
0.1
0.8
V
VIH = 12 V, VCC = 5 V
0.4
1
II
Bus input current
VIH = 12 V, VCC = 0
Other input at 0 V
0.5
1
mA
II
Bus input current
VIH = 7 V, VCC = 5 V
Other input at 0 V
0.8
0.4
mA
VIH = 7 V, VCC = 0
0.8
0.3
receiver switching characteristics over recommended operating conditions (unless otherwise
noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
tPLH
Propagation delay time, low-to-high-level output
7
13
20
ns
tPHL
Propagation delay time, high-to-low-level output
VID = 1.5 V to 1.5 V,
See Figure 4
7
13
20
ns
tsk(p)
Pulse skew ( | tPLH tPHL | )
0.5
1.5
ns
tr
Rise time, output
See Figure 4
2.1
3.3
ns
tf
Fall time, output
See Figure 4
2.1
3.3
ns
PARAMETER MEASUREMENT INFORMATION
VOD
0 V or 3 V
Z
D
Y
VOC
27
27
Figure 1. Driver V
OD
and V
OC