LTC2859IDD Datasheet, PDF (1/16 Pages) Linear Technology – 20Mbps RS485 Transceivers with Integrated Switchable Termination

FEATURES
LTC2859/LTC2861
20Mbps RS485 Transceivers
with Integrated Switchable
Termination
DESCRIPTION
■ _{Integrated, Logic-Selectable 120Ω Termination}
Resistor
■ _{20Mbps Max Data Rate}
■ _{No Damage or Latchup to ESD: ±15kV HBM}
■ _{High Input Impedance Supports 256 Nodes}
■ _{250kbps Low-EMI Mode}
■ _{Guaranteed Failsafe Receiver Operation Over the}
Entire Common Mode Range
■ _{Current Limited Drivers and Thermal Shutdown}
■ _{Delayed Micropower Shutdown (5μA Max)}
■ _{Power Up/Down Glitch-Free Driver Outputs}
■ _{Low Operating Current (900μA Max in Receive Mode)}
■ _{Meets All TIA/EIA-485-A Specifications}
■ _{Available in 10-Pin 3mm × 3mm DFN, 12-Pin}
4mm × 3mm DFN and 16-Pin SSOP Packages
APPLICATIONS
■ _{Low Power RS485/RS422 Transceiver}
■ _{Level Translator}
■ _{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 floating 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
Y–Z
2V/DIV
20ns/DIV
285961 TA02
285961fb
1