20Mbps and Slew Rate Limited 15kV RS485/RS422 Transceiver

The LTC2856-1, 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 fail-safe 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 latch-up or damage.

Part Number

MAX Data Rate (Mbps)

Duplex

Package

LTC2856-1

20

Half

MSOP-8, DFN-8

LTC2856-2

0.25

Half

MSOP-8, DFN-8

LTC2857-1

20

Full

MSOP-8, DFN-8

LTC2857-2

0.25

Full

MSOP-8, DFN-8

LTC2858-1

20

Full

MSOP-10, DFN-10

LTC2858-2

0.25

Full

MSOP-10, DFN-10

Applications

* Low Power RS485/RS422 Transceiver

* Level Translator

* Backplane Transceiver

* 20Mbps or Low EMI 250kbps Maximum Data Rate

* No Damage or Latch-up to ESD: ±15kV HBM

* High Input Impedance Supports 256 Nodes (C, I-Grade)

* Operation Up to 125°C (H-Grade)

* Guaranteed Fail-safe Receiver Operation Over the Entire Common Mode Range

* Current Limited Drivers and Thermal Shutdown