LTC2858HMS-1#PBF

Drivers, Receivers, Transceivers Overview

The LTC2858HMS-1#PBF is a low-power, full-duplex RS485/RS422 transceiver operating on a 5V supply. It supports maximum data rates of 20Mbps or 250kbps for low EMI applications. The device features a one-eighth unit load receiver input resistance exceeding 96kΩ (C, I-Grade), supporting up to 256 nodes per bus. Enhanced ESD protection withstands ±15kV human body model without latchup. Supply current in receive mode is typically 540µA with a maximum of 900µA. Shutdown current is limited to 5µA for C and I grades. The driver maintains high output impedance when disabled.

Drivers, Receivers, Transceivers Feature Summary

• Full-duplex operation with independent transmit and receive channels
• Enhanced ESD protection rated at ±15kV HBM on interface pins
• High input impedance receiver supporting up to 256 nodes on the bus
• Guaranteed failsafe receiver operation ensuring logic-high output during floating inputs

Drivers, Receivers, Transceivers Applications

• Low power RS485/RS422 transceivers
• Level translators
• Backplane transceivers

Drivers, Receivers, Transceivers Procurement Notes

Verify the specific temperature grade suffix matches the required operational range. Confirm the package type corresponds to the design footprint. Ensure the ordering suffix indicates lead-free composition if required by assembly specifications. Cross-reference the datasheet revision to confirm pinout compatibility with existing designs.

Drivers, Receivers, Transceivers Selection Notes

Select this component for applications requiring full-duplex communication with high node density. The one-eighth unit load allows connecting more devices than standard RS485 limits. Choose the H-grade variant for extended temperature ranges up to 125°C. Consider the slew-rate limited version if electromagnetic interference reduction is critical.

Drivers, Receivers, Transceivers Part Context

This part belongs to the LTC285x family of low-power transceivers. It shares architectural similarities with the half-duplex LTC2856 and the enable-less LTC2857 variants. All members offer robust fault protection and operate on standard 5V supplies. The family provides options for different duplex modes and data rate constraints.

Drivers, Receivers, Transceivers Replacement Considerations

LTC2858-2#PBF offers the same package and functionality but with a 250kbps slew-rate limited data rate for lower EMI.

Drivers, Receivers, Transceivers FAQ

What is the receiver input resistance value?

The receiver input resistance is guaranteed to be greater than 96kΩ for C and I grades, representing a one-eighth unit load.

How does the device handle floating inputs?

The failsafe feature guarantees a logic-high output state when inputs are floating or shorted for more than approximately 3µs.

What is the maximum ESD rating?

The transceiver interface pins can withstand ±15kV human body model ESD stress without damage or latchup.