LT1483 Linear Technology, LT1483 Datasheet

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LT1483

Manufacturer Part Number
LT1483
Description
Ultra-Low Power RS485 Low EMI Transceiver with Shutdown
Manufacturer
Linear Technology
Datasheet

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FEATURE
A
TYPICAL
PPLICATI
Battery-Powered RS485/RS422 Applications
Low Power RS485/RS422 Transceiver
Level Translator
Low Power: I
I
1 A Quiescent Current in Shutdown Mode
Controlled Slew Rate Driver for Reduced EMI
Single 5V Supply
Drivers/Receivers Have 10kV ESD Protection
Ground Difference Between Devices on the Data Line
Thermal Shutdown Protection
Power Up/Down Glitch-Free Driver Outputs Permit
Live Insertion or Removal of Transceiver
Driver Maintains High Impedance in Three-State
or with the Power Off
Up to 32 Transceivers on the Bus
Pin Compatible with the LTC485
– 7V to 12V Common-Mode Range Permits 7V
CC
= 500 A Max with Driver Enabled, No Load
RO1
RO2
RE1
DE1
RE2
DE2
DI1
DI2
A
S
CC
O
PPLICATI
= 120 A Max with Driver Disabled
U
D
D
R
R
S
V
GND1
V
GND2
O
CC1
CC2
U
R
R
LTC1483 • TA01
TERM
TERM
Ultra-Low Power RS485 Low EMI
D
The LTC
ceiver designed for data transmission standard RS485
applications with extended common-mode range (– 7V to
12V). It will also meet the requirements of RS422. The
LTC1483 features output drivers with controlled slew rate,
decreasing the EMI radiated from the RS485 lines, and
improving signal fidelity with misterminated lines. The
CMOS design offers significant power savings over its
bipolar counterparts without sacrificing ruggedness against
overload or ESD damage. Typical quiescent current is only
80 A while operating and less than 1 A in shutdown.
The driver and receiver feature three-state outputs, with
the driver outputs maintaining high impedance over the
entire common-mode range. Excessive power dissipation
caused by bus contention or faults is prevented by a
thermal shutdown circuit which forces the driver outputs
into a high impedance state. The receiver has a fail-safe
feature which guarantees a high output state when the
inputs are left open. I/O pins are protected against multiple
ESD strikes of over 10kV.
The LTC1483 is fully specified over the commercial and
extended industrial temperature range and is available in
8-pin DIP and SO packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
ESCRIPTIO
Transceiver with Shutdown
A – B
RO
®
DI
1483 is an ultra-low power differential line trans-
U
LTC1483
1483 TA02
1

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LT1483 Summary of contents

Page 1

... I/O pins are protected against multiple ESD strikes of over 10kV. The LTC1483 is fully specified over the commercial and extended industrial temperature range and is available in 8-pin DIP and SO packages. , LTC and LT are registered trademarks of Linear Technology Corporation TERM A – B ...

Page 2

LTC1483 BSOLUTE (Note 1) Supply Voltage (V ) .............................................. 12V CC Control Input Voltage ..................... – 0. Driver Input Voltage ....................... – 0. Driver Output Voltage ........................................... 14V Receiver ...

Page 3

U SWITCHI G CHARACTERISTICS SYMBOL PARAMETER t Driver Input to Output PLH t Driver Input to Output PHL t Driver Output to Output SKEW Driver Rise or Fall Time Driver Enable to Output High ...

Page 4

LTC1483 W U TYPICAL PERFORMANCE CHARACTERISTICS Driver Differential Output Voltage vs Temperature 2 2.4 2.3 2.2 2.1 2.0 1.9 1.8 1.7 1.6 1.5 – 100 125 –25 TEMPERATURE ( C) 1483 G04 ...

Page 5

TEST CIRCUITS LTC1483 • F01 Figure 1. Driver DC Test Load DIFF Figure 3. Driver/Receiver Timing Test Circuit U W SWITCHI ...

Page 6

LTC1483 U W SWITCHI WAVEFOR OD2 A – B –V OD2 APPLICATIO S I FOR ATIO Basic Theory of Operation Traditionally ...

Page 7

... A max. With the driver in three-state I 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 circuits as described herein will not infringe on existing patent rights. ...

Page 8

... N8 0695 0.189 – 0.197* (4.801 – 5.004 0.150 – 0.157** 0.228 – 0.244 (3.810 – 3.988) (5.791 – 6.197 SO8 0695 LT/GP 1094 10K • PRINTED IN THE USA LINEAR TECHNOLOGY CORPORATION 1994 ...

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