LTC485IN8.#PBF Linear Technology, LTC485IN8.#PBF Datasheet

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LTC485IN8.#PBF

Manufacturer Part Number
LTC485IN8.#PBF
Description
IC, TRANSCEIVER RS485, DIP8, 485
Manufacturer
Linear Technology
Datasheet

Specifications of LTC485IN8.#PBF

Device Type
Differential
No. Of Drivers
1
Supply Voltage Range
4.75V To 5.25V
Driver Case Style
DIP
No. Of Pins
8
Operating Temperature Range
-40°C To +85°C
Svhc
No SVHC (15-Dec-2010)
Interface Type
RS422, RS485
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
FEATURES
APPLICATIO S
TYPICAL APPLICATIO
Low Power RS485/RS422 Transceiver
Level Translator
Low Power: I
Designed for RS485 Interface Applications
Single 5V supply
– 7V to 12V Bus Common Mode Range Permits
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
Combined Impedance of a Driver Output and
Receiver Allows Up to 32 Transceivers on the Bus
70mV Typical Input Hysteresis
30ns Typical Driver Propagation Delays
with 5ns Skew
Pin Compatible with 60V Protected LT1785 and
52Mbps LTC1685
7V Ground Difference Between Devices on the Bus
RO1
RO2
RE1
DE1
RE2
DE2
DI1
DI2
CC
= 300 A Typ
U
D
D
R
R
V
GND1
V
GND2
CC1
CC2
U
LTC485 • TA01
Rt
Rt
DESCRIPTIO
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 design offers significant power savings over its
bipolar counterpart without sacrificing ruggedness against
overload of 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.
The receiver has a fail-safe feature which guarantees a
high output state when the inputs are left open.
The LTC485 is fully specified over the commercial and
extended industrial temperature range.
, LTC and LT are registered trademarks of Linear Technology Corporation.
A
B
®
485 is a low power differential bus/line trans-
Interface Transceiver
U
Driver Outputs
Low Power RS485
LTC485
LTC485 • TA02
LTC485ff
1

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LTC485IN8.#PBF Summary of contents

Page 1

... The receiver has a fail-safe feature which guarantees a high output state when the inputs are left open. The LTC485 is fully specified over the commercial and extended industrial temperature range. , LTC and LT are registered trademarks of Linear Technology Corporation LTC485 • TA01 ...

Page 2

LTC485 BSOLUTE (Note 1) Supply Voltage ....................................................... 12V Control Input Voltages ................... – 0. Driver Input Voltage ....................... – 0. Driver Output Voltage ........................................... 14V Receiver Input Voltage .......................................... ...

Page 3

U SWITCHI G CHARACTERISTICS temperature range, otherwise specifications are at T SYMBOL PARAMETER I Supply Current CC I Driver Short-Circuit Current, V OSD1 OUT I Driver Short-Circuit Current, V OSD2 OUT I Receiver Short-Circuit Current OSR t Driver Input to ...

Page 4

LTC485 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 – 125 75 100 TEMPERATURE (°C) LTC485 • TPC03 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 be ...

Page 6

LTC485 U W SWITCHI WAVEFOR OD2 A, B –V OD2 ...

Page 7

U U APPLICATIO S I FOR ATIO Basic Theory of Operation Previous RS485 transceivers have been designed using bipolar technology because the common-mode range of the device must extend beyond the supplies and the device must be immune to ESD ...

Page 8

LTC485 U U APPLICATIO S I FOR ATIO The LTC485 output stage will maintain a high impedance state until the breakdown of the N-channel or P-channel is reached when going positive or negative respectively. The output will be clamped to ...

Page 9

U U APPLICATIO S I FOR ATIO LTC485 Line Length vs Data Rate The maximum line length allowable for the RS422/RS485 standard is 4000 feet. A LTC485 B 4000 FT 26AWG NOISE TWISTED PAIR TTL GENERATOR IN Figure 14. Line ...

Page 10

LTC485 TYPICAL APPLICATIO S PACKAGE DESCRIPTIO CORNER LEADS OPTION 0.045 – 0.068 (1.143 – 1.727) FULL LEAD OPTION 0.300 BSC (0.762 BSC) 0.008 – 0.018 (0.203 – 0.457) NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE OR TIN PLATE LEADS 10 ...

Page 11

... FLASH SHALL NOT EXCEED 0.010" (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 12

... Industry-Standard Pinout, 500ps Propagation Delay Skew LTC490/LTC491 Pin Compatible Highest Speed, LTC486/LTC487 Pin Compatible 15kV ESD, LTC490 Pin Compatible 15kV ESD, Fail-Safe (LT1785A) 15kV ESD, Fail-Safe (LT1791A) www.linear.com LTC485ff LT/LCG 1101 1.5K REV F • PRINTED IN THE USA LINEAR TECHNOLOGY CORPORATION 1994 ...

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