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LTC2859 Datasheet, PDF (1/16 Pages) Linear Technology – 20Mbps RS485 Transceivers with Integrated Switchable Termination | |||
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FEATURES
LTC2859/LTC2861
20Mbps RS485 Transceivers
with Integrated Switchable
Termination
DESCRIPTION
â Integrated, Logic-Selectable 120Ω Termination
Resistor
â 20Mbps Max Data Rate
â No Damage or Latchup to ESD: ±15kV HBM
â High Input Impedance Supports 256 Nodes
â 250kbps Low-EMI Mode
â Guaranteed Failsafe Receiver Operation Over the
Entire Common Mode Range
â Current Limited Drivers and Thermal Shutdown
â Delayed Micropower Shutdown (5μA Max)
â Power Up/Down Glitch-Free Driver Outputs
â Low Operating Current (900μA Max in Receive Mode)
â Meets All TIA/EIA-485-A Speciï¬cations
â Available in 10-Pin 3mm à 3mm DFN, 12-Pin
4mm à 3mm DFN and 16-Pin SSOP Packages
APPLICATIONS
â Low Power RS485/RS422 Transceiver
â Level Translator
â Backplane Transceiver
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
The LTC®2859 and LTC2861 are low power, 20Mbps
RS485/422 transceivers operating on 5V supplies. The
receiver includes a logic-selectable 120Ω termination,
one-eighth unit load supporting up to 256 nodes per bus,
and a failsafe feature that guarantees a high output state
under conditions of ï¬oating or shorted inputs.
The driver features a logic-selectable low-EMI 250kbps
operating mode, and 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 a thermal shutdown.
Enhanced ESD protection allows the LTC2859 and LTC2861
to withstand ±15kV (human body model) on the transceiver
interface pins without latchup or damage.
PRODUCT SELECTION GUIDE
PART NUMBER
LTC2859
LTC2861
DUPLEX
Half
Full
PACKAGE
DFN-10
SSOP-16, DFN-12
TYPICAL APPLICATION
RO
R
RE
TE
DE
DI
D
SLO
LTC2859
120Ω
LTC2859
120Ω
LTC2859
R
RO
RE
TE
DE
D
DI
SLO
2859/61 TA01
120Ω
R
D
RO RE TE DE DI SLO
LTC2859 at 20Mbps
DI
Y
Z
YâZ
2V/DIV
20ns/DIV
285961 TA02
285961fb
1
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