LTC485 Linear Technology Corporation, LTC485 Datasheet

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LTC485

Manufacturer Part Number
LTC485
Description
Low Power RS485 Interface Transceiver
Manufacturer
Linear Technology Corporation
Datasheet

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FEATURE
A
TYPICAL
PPLICATI
ESD Protection over 10kV
Low Power: I
28ns Typical Driver Propagation Delays with
4ns Skew
Designed for RS485 or RS422 Applications
Single 5V Supply
– 7V to 12V Bus Common-Mode Range Permits 7V
Ground Difference Between Devices on the Bus
Thermal Shutdown Protection
Power-Up/Down Glitch-Free Driver Outputs
Driver Maintains High Impedance in Three-State or
with the Power Off
Combined Impedance of a Driver Output and
Receiver Allows up to 32 Transceivers on the Bus
60mV Typical Input Hysteresis
Pin Compatible with the SN75176A, DS75176A, and
SN75LBC176
Low Power RS485/RS422 Transceiver
Level Translator
S
A
CC
O
PPLICATI
= 1.8mA Typ
U
RO
DI
S
4
1
DRIVER
DE
RECEIVER
O
3
RE
2
U
LTC1485
5V
8
5
6
7
120
4000 FT 24 GAUGE TWISTED PAIR
D
The LTC
ceiver designed for multipoint data transmission standard
RS485 applications with extended common-mode range
(12V to – 7V). It also meets the requirements of RS422.
The CMOS with Schottky design offers significant power
savings over its bipolar counterpart without sacrificing
ruggedness against overload or ESD damage.
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. I/O pins are protected against
multiple ESD strikes of over 10kV.
The receiver has a fail-safe feature which guarantees a
high output state when the inputs are left open.
Both AC and DC specifications are guaranteed from – 40 C
to 85 C and 4.75V to 5.25V supply voltage range.
, LTC and LT are registered trademarks of Linear Technology Corporation.
ESCRIPTIO
Differential Bus Transceiver
120
®
1485 is a low power differential bus/line trans-
6
7
LTC1485
5V
8
5
U
RECEIVER
DRIVER
RE
2
DE
3
1485 TA01
1
4
RO
DI
LTC1485
1

LTC485 Summary of contents

Page 1

... ESD strikes of over 10kV. The receiver has a fail-safe feature which guarantees a high output state when the inputs are left open. Both AC and DC specifications are guaranteed from – and 4.75V to 5.25V supply voltage range. , LTC and LT are registered trademarks of Linear Technology Corporation LTC1485 6 ...

Page 2

LTC1485 BSOLUTE (Note 1) Supply Voltage (V ) .............................................. 12V CC Control Input Voltages ................... – 0. Control Input Currents ........................ – 50mA to 50mA Driver Input Voltages ..................... – 0.5V ...

Page 3

U S WITCHI G C HARA TERISTICS (Notes 2, 3), unless otherwise noted. CC SYMBOL PARAMETER t Driver Input to Output PLH t Driver Input to Output PHL t Driver Output to Output SKEW t , ...

Page 4

LTC1485 W U TYPICAL PERFOR A Receiver Output Low Voltage vs Temperature 0 8mA 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 –50 – 100 125 TEMPERATURE ( C) 1485 G04 Driver Output ...

Page 5

CTIO S RO (Pin 1): Receiver Output. If the receiver output is enabled (RE low), then if A > 200mV, RO will be high < 200mV, then RO will ...

Page 6

LTC1485 WITCHI WAVEFOR – 10% – A A OD2 ...

Page 7

WITCHI TI E WAVEFOR PPLICATI S I FOR ATIO Typical Application A typical connection of the LTC1485 is shown in Figure ...

Page 8

LTC1485 PPLICATI S I FOR ATIO Thermal Shutdown The LTC1485 has a thermal shutdown feature which protects the part from excessive power dissipation. If the outputs of the driver are accidentally shorted to a power supply ...

Page 9

PPLICATI S I FOR ATIO PROBE HERE R DX DRIVER 120 470 Figure 12. Termination Effects AC Cable Termination Cable termination resistors are necessary to prevent un- wanted ...

Page 10

LTC1485 PPLICATI S I FOR ATIO The termination resistors are used to generate a DC bias which forces the receiver output to a known state, in this case a logic 0. The first method consumes about ...

Page 11

... MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm). 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 12

... Fits 75179 Pinout, Only 300 A I Fits 75176 Pinout 499-3977 0.189 – 0.197* (4.801 – 5.004 0.150 – 0.157* (3.810 – 3.988 0.004 – 0.010 (0.101 – 0.254) 0.050 (1.270) BSC SO8 0294 LT/GP 0795 2K REV A • PRINTED IN THE USA LINEAR TECHNOLOGY CORPORATION 1995 ...

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