LTC2856-1 Datasheet, PDF (1/20 Pages) Linear Technology – 20Mbps and Slew Rate Limited 15kV RS485/RS422 Transceivers

FEATURES
■ _{20Mbps or Low EMI 250kbps Maximum Data Rate}
■ _{No Damage or Latchup to ESD: ±15kV HBM}
■ _{High Input Impedance Supports 256 Nodes}
(C, I-Grade)
■ _{Operation Up to 125°C (H-Grade)}
■ _{Guaranteed Failsafe Receiver Operation Over the}
Entire Common Mode Range
■ _{Current Limited Drivers and Thermal Shutdown}
■ _{Delayed Micropower Shutdown: 5μA Maximum}
(C, I-Grade)
■ _{Power Up/Down Glitch-Free Driver Outputs}
■ _{Low Operating Current: 900μA Maximum in Receive}
Mode
■ _{Compatible with TIA/EIA-485-A Specifications}
■ _{Available in 8-Lead and 10-Lead 3mm × 3mm DFN}
and 8-Lead and 10-Lead MSOP Packages
APPLICATIONS
■ _{Low Power RS485/RS422 Transceiver}
■ _{Level Translator}
■ _{Backplane Transceiver}
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
LTC2856-1/LTC2856-2
LTC2857-1/LTC2857-2
LTC2858-1/LTC2858-2
20Mbps and Slew Rate
Limited 15kV RS485/RS422
Transceivers
DESCRIPTION
The LTC^®2856-1, LTC2856-2, LTC2857-1, LTC2857-2,
LTC2858-1 and LTC2858-2 are low power, RS485/RS422
transceivers operating on 5V supplies at maximum data
rates of 20Mbps or 250kbps for low EMI. 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
±15kV (human body model) on the transceiver interface
pins without latchup or damage.
PART
NUMBER
LTC2856-1
LTC2856-2
LTC2857-1
LTC2857-2
LTC2858-1
LTC2858-2
MAX DATA
RATE (Mbps)
20
0.25
20
0.25
20
0.25
DUPLEX
Half
Half
Full
Full
Full
Full
PACKAGE
MSOP-8, DFN-8
MSOP-8, DFN-8
MSOP-8, DFN-8
MSOP-8, DFN-8
MSOP-10, DFN-10
MSOP-10, DFN-10
TYPICAL APPLICATION
LTC2856-1
RO1
R
RE1
DE1
DI1
D
V_CC1
R_T
GND1
LTC2856-1
RO2
R
RE2
R_T
V_CC2
DE2
DI2
D
GND2
285678 TA01a
LTC2858-1 at 20Mbps
DI
Y
Z
Y-Z
20ns/DIV
2856 TA01b
285678fe
1