LTC2857IMS8-2#PBF

Drivers, Receivers, Transceivers Overview

The LTC2857IMS8-2#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. Enhanced ESD protection withstands ±15kV (HBM) without latchup. Key electrical parameters include a maximum shutdown current of 5µA, a receive mode operating current of 900µA maximum, and driver short-circuit current limits of ±250mA. It includes thermal shutdown and glitch-free power-up outputs.

Drivers, Receivers, Transceivers Feature Summary

• Slew rate limited driver outputs designed to control high-frequency EMI emissions.
• Guaranteed failsafe receiver operation ensuring a logic-high state during floating or shorted inputs.
• High input impedance receiver allowing connection of up to 256 nodes on the bus.
• Integrated current limiting and thermal shutdown to prevent damage from bus contention.

Drivers, Receivers, Transceivers Applications

• Low power RS485/RS422 transceivers
• Level translator circuits
• Backplane transceivers

Drivers, Receivers, Transceivers Procurement Notes

Verify the specific suffix #PBF indicates lead-free packaging compliant with RoHS standards. Confirm the IMS8 designation corresponds to the 8-lead MSOP package type. Ensure the -2 suffix matches the required 250kbps slew-rate-limited specification rather than the standard 20Mbps variant. Cross-reference the manufacturer part number with official Analog Devices documentation to validate authenticity.

Drivers, Receivers, Transceivers Selection Notes

Select this component when designing systems requiring full-duplex communication with strict electromagnetic interference constraints. The -2 suffix provides a reduced data rate capability specifically intended to minimize radiated emissions compared to the -1 variant. Verify that the 5V supply voltage aligns with the system's power architecture and that the 8-lead MSOP package fits the available PCB footprint.

Drivers, Receivers, Transceivers Part Context

This device belongs to the LTC285x family of rugged transceivers, which also includes half-duplex variants like the LTC2856 and higher-pin-count versions like the LTC2858. The family shares common features such as 15kV ESD protection and low power consumption. The LTC2857 specifically addresses full-duplex requirements without separate enable pins for the driver and receiver.

Drivers, Receivers, Transceivers Replacement Considerations

LTC2857IMS8-1#PBF: Identical package and temperature range but supports 20Mbps data rates without slew limiting.