Datasheet

LTC2850/LTC2851/LTC2852
1
285012fe
For more information www.linear.com/LTC2850
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
3.3V 20Mbps RS485/RS422
Transceivers
The LT C
®
2850, LTC2851 and LTC2852 are low power,
20Mbps RS485/RS422 transceivers operating on 3.3V
supplies. The receiver has a one-eighth unit load supporting
up to 256 nodes per bus (C-, I-grade), and a failsafe feature
that guarantees a high output state under conditions of
floating or shorted inputs.
The driver maintains a high output impedance
over the
entire common mode range when disabled or when the
supply is removed. Excessive power dissipation caused by
bus contention or a fault is prevented by current limiting
all outputs and by thermal shutdown.
Enhanced ESD protection allows these parts to withstand
up to ±15kV (human body model) on the transceiver
interface pins without latchup or damage.
LTC2850 at 20Mbps Into 54Ω
n
3.3V Supply Voltage
n
20Mbps Maximum Data Rate
n
No Damage or Latchup Up to ±15kV HBM
n
High Input Impedance Supports 256 Nodes
(C-, I-Grade)
n
Operation Up to 125°C (H-Grade)
n
Guaranteed Failsafe Receiver Operation Over the
Entire Common Mode Range
n
Current Limited Drivers and Thermal Shutdown
n
Delayed Micropower Shutdown: 5µA Maximum
(C-, I-Grade)
n
Power Up/Down Glitch-Free Driver Outputs
n
Low Operating Current: 370µA Typical in
Receive Mode
n
Compatible with TIA/EIA-485-A Specifications
n
Available in 8-Pin and 10-Pin 3mm × 3mm DFN,
8-Pin and 10-Pin MSOP, and 8-Pin and 14-Pin
SO Packages
n
Low Power RS485/RS422 Transceiver
n
Level Translator
n
Backplane Transceiver
V
CC1
GND1
R
RO1
RE1
DE1
DI1
D
R
T
LTC2850
LTC2850
R
T
285012 TA01a
V
CC2
GND2
R
RO2
RE2
DE2
DI2
D
PART NUMBER DUPLEX PACKAGE
LTC2850 Half SO-8, MSOP-8, DFN-8
LTC2851 Full SO-8, MSOP-8, DFN-8
LTC2852 Full SO-14, MSOP-10, DFN-10
20ns/DIV
2V/DIV
285012 TA01b
DI
A
B
A-B
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