LTC1535CSW Linear Technology, LTC1535CSW Datasheet

IC LINE TRANSCEIVER 28-SOIC

LTC1535CSW

Manufacturer Part Number
LTC1535CSW
Description
IC LINE TRANSCEIVER 28-SOIC
Manufacturer
Linear Technology
Type
Transceiverr
Datasheet

Specifications of LTC1535CSW

Number Of Drivers/receivers
1/1
Protocol
RS485
Voltage - Supply
4.5 V ~ 5.5 V
Mounting Type
Surface Mount
Package / Case
28-SOIC (7.5mm Width)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
Q1471168

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LTC1535CSW
Manufacturer:
LINEAR
Quantity:
2 945
Part Number:
LTC1535CSW
Quantity:
2 928
Part Number:
LTC1535CSW
Manufacturer:
LT
Quantity:
20 000
Part Number:
LTC1535CSW#PBF
Manufacturer:
LT
Quantity:
6 592
Part Number:
LTC1535CSW#PBF
Manufacturer:
LINEAR/凌特
Quantity:
20 000
Part Number:
LTC1535CSW#TRPBF
Manufacturer:
EXAR
Quantity:
1 150
FEATURES
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APPLICATIONS
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TYPICAL APPLICATION
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
68kΩ 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
** COOPER (888) 414-2645
1
LOGIC COMMON
2
FLOATING RS485 COMMON
®
V
10μF
CC
File #E151738
RO
RE
DE
DI
+
1
1
28
27
26
25
1
4
RO
RE
DE
DI
V
GND
CC
RMS
ST1
2
3
ST2
CTX02-14659
420kHz
**
DESCRIPTION
1/2 BAT54C
1/2 BAT54C
The LTC
line transceiver. Isolated RS485 is ideal for systems where
the ground loop is broken to allow for much larger common
mode voltage ranges. An internal capacitive isolation barrier
provides 2500V
and the logic level interface. The powered side contains a
420kHz push-pull converter to power the isolated RS485
transceiver. Internal full-duplex communication 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
current limits in both directions and a slow slew rate select
to minimize EMI or refl ections. The 68kΩ receiver input
allows up to 128 node connections. A fail-safe feature
defaults to a high output state when the receiver inputs
are open or shorted.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Isolated RS485 Transceiver
2
®
1535 is an isolated RS485 full-duplex differential
2
GND2
+
11
R
D
RMS
10μF
V
14
of isolation between the line transceiver
CC2
RO2
SLO
1535 TA01
A
B
Y
Z
16
15
17
13
12
18
LTC1535
TWISTED-PAIR
CABLE
1535fb
1

Related parts for LTC1535CSW

LTC1535CSW Summary of contents

Page 1

... A fail-safe feature defaults to a high output state when the receiver inputs are open or shorted. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. ** ...

Page 2

... ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL LTC1535CSW#PBF LTC1535CSW#TRPBF LTC1535ISW#PBF LTC1535ISW#TRPBF Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi label on the shipping container. For more information on lead free part marking, go to: For more information on tape and reel specifi ...

Page 3

ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are at T SYMBOL PARAMETER V V Supply Range Supply Range CC2 CC2 I V Supply Current Supply Current CC2 CC2 V Differential Driver Output ...

Page 4

LTC1535 ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are at T SYMBOL PARAMETER t Data Sample Jitter SJ f Max Baud Rate MAX t Driver Input to Output PLH t Driver Input to Output PHL Driver Rise ...

Page 5

TYPICAL PERFORMANCE CHARACTERISTICS V Supply Current CC vs Temperature 130 COOPER CC CTX02-14659 120 TRANSFORMER 110 R = 54Ω L 100 120Ω OPEN –50 –25 0 ...

Page 6

LTC1535 TYPICAL PERFORMANCE CHARACTERISTICS Receiver Output High Voltage vs Temperature 4 8mA 4 4.5V CC 3.5 3.0 –50 – 100 125 150 TEMPERATURE (°C) 1535 G10 Driver Output ...

Page 7

PIN FUNCTIONS POWER SIDE V (Pin 1): 5V Supply. Bypass to GND with 10μF CC capacitor. ST1 (Pin 2): DC Converter Output Transformer. ST2 (Pin 3): DC Converter Output Transformer. GND (Pin 4): Ground. ...

Page 8

LTC1535 TEST CIRCUIT 10μ MAX RO BAUD RATE GND 4 1 LOGIC COMMON 1 Figure 1. Self-Oscillation at Maximum Data Rate (Test ...

Page 9

SWITCHING TIME WAVEFORMS – OD2 A – B –V OD2 ...

Page 10

LTC1535 APPLICATIONS INFORMATION 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 isolation. Communication between RMS ...

Page 11

APPLICATIONS INFORMATION Driver Output and Slow Slew Rate Control The LTC1535 uses a proprietary driver output stage that allows a common mode voltage range that extends beyond the power supplies. Thus, the high impedance state is maintained over the full ...

Page 12

LTC1535 APPLICATIONS INFORMATION Table 1. List of Transformers Designed for LTC1535 MANUFACTURER Cooper Cooper Epcos AG (Germany) (USA) Midcom Minntronix Pulse FEE (France) Sumida (Japan) Transpower Table 2. Fault Mode Behavior FUNCTION (PINS) DC/DC Converter ( ...

Page 13

APPLICATIONS INFORMATION High Voltage Considerations The LTC1535 eliminates ground loops on data commun- ication lines. However, such isolation can bring potentially dangerous voltages onto the circuit board. An example would be accidental faulting to 117V AC at some point on ...

Page 14

LTC1535 APPLICATIONS INFORMATION DI Y-Z Figure 13. Driver Propagation Delay with Sample Jitter. SLO = Figure 15. Driver Output. = 5V, SLO = 27Ω, V CC2 Y-Z Figure 17. Driver Differential Output. = 5V, ...

Page 15

TYPICAL APPLICATION RO RE LTC1535 DE DI (20a) Noninverting Figure 20. Confi guring Receiver for TTL Level Input. Y and Z Outputs Are TTL Compatible with No Modifi cation 2 ST1 10μ ...

Page 16

LTC1535 PACKAGE DESCRIPTION 28-Lead Plastic Small Outline Isolation Barrier (Wide .300 Inch) .291 – .299** (7.391 – 7.595) .010 – .029 45° (0.254 – 0.737) .009 – .013 (0.229 – 0.330) NOTE 2 .016 – .050 (0.406 – 1.270) NOTE: ...

Page 17

... Revise Figure 1. Update Tables 1 and 3 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 representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. LTC1535 ...

Page 18

... TA05 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 1209 REV B • PRINTED IN USA © LINEAR TECHNOLOGY CORPORATION 2009 1535fb ...

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