ltc1535csw-trpbf Linear Technology Corporation, ltc1535csw-trpbf Datasheet

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ltc1535csw-trpbf

Manufacturer Part Number
ltc1535csw-trpbf
Description
Isolated Rs485 Transceiver
Manufacturer
Linear Technology Corporation
Datasheet
FEATURES
APPLICATIO S
TYPICAL APPLICATIO
UL Rated Isolated RS485: 2500V
UL Recognized
Eliminates Ground Loops
250kBd Maximum Data Rate
Self-Powered with 420kHz Converter
Half- or Full-Duplex
Fail-Safe Output High for Open or
Shorted Receiver Inputs
Short-Circuit Current Limit
Slow Slew Rate Control
68k Input Impedance Allows Up to 128 Nodes
Thermal Shutdown
8kV ESD Protection On Driver Outputs and
Receiver Inputs
Available in 28-Lead SW Package
Isolated RS485 Receiver/Driver
RS485 with Large Common Mode Voltage
Breaking RS485 Ground Loops
Multiple Unterminated Line Taps
** TRANSFORMER
1
2
COOPER (561) 241-7876
LOGIC COMMON
FLOATING RS485 COMMON
®
U
V
10 F
CC
File #E151738
RO
RE
DE
DI
+
1
1
28
27
26
25
1
4
RO
RE
DE
DI
U
V
GND
CC
RMS
ST1
2
3
ST2
CTX02-14659
420kHz
**
DESCRIPTIO
The LTC
line transceiver. Isolated RS485 is ideal for systems where
the ground loop is broken to allow for much larger com-
mon mode voltage ranges. An internal capacitive isolation
barrier provides 2500V
transceiver and the logic level interface. The powered side
contains a 420kHz push-pull converter to power the iso-
lated RS485 transceiver. Internal full-duplex communica-
tion occurs through the capacitive isolation barrier. The
transceiver meets RS485 and RS422 requirements.
The driver and receiver feature three-state outputs, with
the driver maintaining high impedance over the entire
common mode range. The drivers have short-circuit cur-
rent limits in both directions and a slow slew rate select to
minimize EMI or reflections. The 68k
allows up to 128 node connections. A fail-safe feature
defaults to a high output state when the receiver inputs are
open or shorted.
Isolated RS485 Transceiver
1/2 BAT54C
1/2 BAT54C
, LTC and LT are registered trademarks of Linear Technology Corporation.
2
®
1535 is an isolated RS485 full-duplex differential
2
GND2
+
11
R
D
10 F
V
U
14
CC2
RO2
SLO
1535 TA01
A
B
Y
Z
RMS
16
15
17
13
12
18
of isolation between the line
LTC1535
receiver input
TWISTED-PAIR
CABLE
1535fa
1

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ltc1535csw-trpbf Summary of contents

Page 1

... EMI or reflections. The 68k allows up to 128 node connections. A fail-safe feature defaults to a high output state when the receiver inputs are open or shorted. , LTC and LT are registered trademarks of Linear Technology Corporation. ** CTX02-14659 1/2 BAT54C 2 ...

Page 2

... CM –7V V 10V CM DE, DI, RE SLO DE, DI, RE SLO (Note 3) –7V V 12V, (Note 4) CM –7V V 12V – TOP VIEW ORDER PART NUMBER LTC1535CSW 26 DE LTC1535ISW SLO 17 RO2 PACKAGE = 125 C/W JA MIN TYP MAX 4.5 5.5 4.5 7 ...

Page 3

ELECTRICAL CHARACTERISTICS temperature range, otherwise specifications are at T SYMBOL PARAMETER V Receiver Input Open Circuit Voltage IOC V RO Output High Voltage Output Low Voltage OL I Driver Output Leakage OZ V RO2 Output High Voltage ...

Page 4

LTC1535 ELECTRICAL CHARACTERISTICS 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 tested 5V, ...

Page 5

W U TYPICAL PERFOR A CE CHARACTERISTICS Switcher Frequency vs Temperature 600 500 400 300 200 –50 – 100 125 150 TEMPERATURE ( C) 1535 G07 Receiver Output High Voltage vs Temperature ...

Page 6

LTC1535 CTIO S POWER SIDE V (Pin 1): 5V Supply. Bypass to GND with 10 F capaci- CC tor. ST1 (Pin 2): DC Converter Output Transformer. ST2 (Pin 3): DC Converter Output ...

Page 7

TEST CIRCUITS MAX RO BAUD RATE GND 4 1 LOGIC COMMON 1 (Test Configuration for the First Six Typical Performance ...

Page 8

LTC1535 U W SWITCHI WAVEFOR – ...

Page 9

U U APPLICATIO S I FOR ATIO Isolation Barrier and Sampled Communication The LTC1535 uses the SW-28 isolated lead frame package to provide capacitive isolation barrier between the logic interface and the RS485 driver/receiver pair. The barrier provides 2500V of ...

Page 10

LTC1535 U U APPLICATIO S I FOR ATIO Driver Output and Slow Slew Rate Control The LTC1535 uses a proprietary driver output stage that allows a common mode voltage range that extends be- yond the power supplies. Thus, the high ...

Page 11

U U APPLICATIO S I FOR ATIO Table 1. List of Transformers Designed for LTC1535 MANUFACTURER Cooper Cooper Epcos AG (Germany) B78304-A1477-A3 Midcom Pulse FEE (France) Sumida (Japan) Transpower Table 2. Fault Mode Behavior FUNCTION (PINS) DC/DC Converter (2, 3) ...

Page 12

LTC1535 U U APPLICATIO S I FOR ATIO High Voltage Considerations The LTC1535 eliminates ground loops on data communi- cation lines. However, such isolation can bring potentially dangerous voltages onto the circuit board. An example would be accidental faulting to ...

Page 13

U U APPLICATIO S I FOR ATIO DI Y–Z Figure 13. Driver Propagation Delay with Sample Jitter. SLO = Figure 15. Driver Output 5V, SLO = V CC2 Y–Z Figure 17. ...

Page 14

LTC1535 U TYPICAL APPLICATIO LTC1535 DE DI (20a) Noninverting Figure 20. Configuring Receiver for TTL Level Input. Y and Z Outputs Are TTL Compatible with No Modification 2 ST1 ...

Page 15

... DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED .010" (0.254mm) PER SIDE Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. ...

Page 16

... CH0 GND ZS SET 1535 TA03 2 COMMENTS 5% Accurate with No Optoisolator Required 10Mbps, Pin Compatible with LTC485 2.5V Isolated Reference, 3000V Isolation RMS 15kV ESD Protection, Industry Standard Pinout 15kV ESD Protection, Fail-Safe Receiver LT/TP 1103 1K REV A • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 1999 1535fa ...

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