LTC2857HMS8-2#PBF

Drivers, Receivers, Transceivers Overview

The LTC2857HMS8-2#PBF is a low-power, full-duplex RS485/RS422 transceiver manufactured by Analog Devices Inc. It operates on a single 5V supply and supports maximum data rates of either 20Mbps or 250kbps for low EMI applications. The device features a one-eighth unit load receiver input resistance exceeding 96kΩ, supporting up to 256 nodes per bus. It includes enhanced ESD protection rated at ±15kV (human body model) without latchup or damage. The component provides current-limited drivers and thermal shutdown protection against excessive power dissipation. It is housed in an 8-lead MSOP package.

Drivers, Receivers, Transceivers Feature Summary

• Full-duplex communication capability with independent driver and receiver channels
• Slew rate limiting functionality available for reduced electromagnetic interference emissions
• High input impedance receiver design allowing extensive network node expansion
• Integrated failsafe mechanism ensuring logic-high output during floating or shorted input conditions

Drivers, Receivers, Transceivers Applications

• Low EMI industrial communication networks requiring controlled signal edge rates
• Backplane transceiver systems utilizing standard RS485/RS422 protocols
• Level translation interfaces between microcontrollers and differential bus lines
• Multi-drop serial communication buses requiring high node density support

Drivers, Receivers, Transceivers Procurement Notes

Verify the specific suffix designation when ordering to ensure correct speed grade selection. The part number indicates a fixed slew-rate limited variant intended for lower frequency operation compared to the standard high-speed counterpart. Confirm package type and temperature range requirements match the application environment specifications before procurement.

Drivers, Receivers, Transceivers Selection Notes

Select this variant specifically when low electromagnetic interference is a primary design constraint. The internal slew rate limitation restricts the maximum data rate to 250kbps, making it unsuitable for high-speed 20Mbps applications. Ensure the system timing requirements align with the slower transition times inherent to this specific speed grade configuration.

Drivers, Receivers, Transceivers Part Context

This component belongs to the LTC2857 family of low-power RS485/RS422 transceivers. The family differentiates variants primarily by maximum data rate capabilities and duplex mode configurations. The -2 suffix denotes the specific speed grade within the full-duplex product line, distinguishing it from the higher bandwidth -1 variant while maintaining identical pinout and functional interface characteristics.

Drivers, Receivers, Transceivers Replacement Considerations

LTC2857HMS8-1#PBF offers identical packaging and electrical interface but supports 20Mbps data rates instead of the slew-limited 250kbps rate.