ltc1535csw-trpbf Linear Technology Corporation, ltc1535csw-trpbf Datasheet - Page 4

• Manufacturer Part Number: ltc1535csw-trpbf
• Description: Isolated Rs485 Transceiver
• Manufacturer: Linear Technology Corporation

LTC1535
Note 1: Absolute Maximum Ratings are those values beyond which the
life of a device may be impaired.
Note 2: RS422 50 specification based on RS485 27 test.
Note 3: I
GND2 V
Note 4: Input fault conditions on the RS485 receiver are detected with a
fixed receiver offset. The offset is such that an input short or open will
result in a high data output.
Note 5: The low voltage detect faults when V
and reenables when greater than V
through the weak driver output on RE.
Note 6: Value derived from 1 second test.
4
ELECTRICAL CHARACTERISTICS
TYPICAL PERFOR A CE CHARACTERISTICS
500
400
300
200
100
130
120
110
100
90
80
70
60
50
–50 –25
–50 –25
Maximum Baud Rate vs
Temperature
V
Temperature
IN
CC
V
SLO = V
R
V
CC2
CC
L
CC
is tested at V
Supply Current vs
= 54
= V
= 5V
CC2
5.25V.
CC2
0
0
TEMPERATURE ( C)
TEMPERATURE ( C)
= 4.5V
25
25
CC2
50
50
COOPER
CTX02-14659
TRANSFORMER
R
R
R
= 5V, guaranteed by design from
L
L
L
= 54
= 120
= OPEN
75
75
UVH
100 125 150
100 125 150
W
. The fault can be monitored
1535 G04
1535 G01
CC2
U
or V
CC
drops below V
65
60
55
50
45
40
35
30
25
90
80
70
60
50
40
30
20
10
–50 –25
–50 –25
Driver Differential Output Rise/
Fall Time vs Temperature
V
Temperature
CC2
V
SLO = V
R
f
SLO = 0V
R
DI
CC2
L
L
= 54
= f
= 54
Supply Current vs
= 5V, 4.5V
MAX
CC2
0
0
UVL
TEMPERATURE ( C)
TEMPERATURE ( C)
V
V
V
25
25
CC2
CC2
CC2
= 6V
= 5V
= 4.5V
50
50
Note 7: The input signals are internally sampled and encoded. The internal
sample rate determines the data output jitter since the internal sampling is
asynchronous with respect to the external data. Nominally, a 4MHz
internal sample rate gives 250ns of sampling uncertainty in the input
signals.
Note 8: The maximum baud rate is 250kBd with 10% sampling jitter.
Lower baud rates have lower jitter.
Note 9: Start-up time is the time for communication to recover after a fault
condition. Data time-out is the time a fault is indicated on RE after data
communication has stopped.
Note 10. I
75
75
100 125 150
100 125 150
CC
measured with no load, ST1 and ST2 floating.
1535 G05
1535 G02
800
700
600
500
400
300
200
6.5
6.0
5.5
5.0
4.5
–50 –25
–50 –25
V
Temperature
Driver Differential Output Rise/
Fall Time vs Temperature
CC2
f
SLO = 0V
COOPER
CTX02-14659
TRANSFORMER
SLO = 0V
R
DI
L
= 250kHz
= 54
Supply Voltage vs
0
0
TEMPERATURE ( C)
TEMPERATURE ( C)
R
R
R
L
L
L
25
25
= OPEN, V
= 54 , V
= 54 , V
V
V
50
50
CC2
CC2
= 5V
= 4.5V
CC
CC
CC
75
75
= 5V
= 4.5V
= 5V
100 125 150
100 125 150
1535 G03
1535 G06
1535fa