MAX1485CUB+T

Drivers, Receivers, Transceivers Overview

The MAX1485CUB+T is a software-selectable, half-/full-duplex RS-485/RS-422 transceiver housed in a 10-pin µMAX package. It operates on a single +5V supply with a typical quiescent current of 300µA. The device features slew-rate-limited drivers that minimize EMI and reduce reflections, supporting error-free data transmission up to 250kbps. It includes one driver and one receiver with a 1/8-unit-load input impedance, allowing up to 256 transceivers on the bus. The C suffix indicates an operating temperature range of 0°C to +70°C.

Drivers, Receivers, Transceivers Feature Summary

• Software-selectable half-/full-duplex operation via the H/F pin
• Slew-rate limiting for minimized EMI and reduced signal reflections
• 1/8-unit-load receiver input impedance enabling high node counts
• Output short-circuit current limiting and thermal shutdown protection

Drivers, Receivers, Transceivers Applications

• Low-power RS-422/RS-485 communications
• Level translators
• Hand-held equipment
• Battery-powered equipment
• Transceiver for EMI-sensitive applications

Drivers, Receivers, Transceivers Procurement Notes

Verify the component designation matches the specific commercial grade (C suffix) and packaging format (T suffix for tape and reel). Confirm RoHS compliance status through official manufacturer documentation or authorized distributors. Ensure the ordering information aligns with the required temperature range and package type for the intended application environment.

Drivers, Receivers, Transceivers Selection Notes

Select this component when space constraints require the smallest 10-pin package available. It is suitable for designs needing software-configurable duplex modes without external logic gates. The slew-rate limitation makes it appropriate for environments where electromagnetic interference must be minimized. Verify that the 250kbps maximum data rate meets system requirements.

Drivers, Receivers, Transceivers Part Context

This part belongs to the MAX1481/MAX1484/MAX1485/MAX1486 family of high-speed transceivers. While functionally similar to industry-standard parts like the MAX491, it offers distinct advantages in size and configurability. The MAX1485 specifically provides selectable duplex operation, differentiating it from fixed full-duplex variants within the same series.

Drivers, Receivers, Transceivers FAQ

How is the half-/full-duplex mode selected?

The mode is selected by connecting the H/F pin to VCC for half-duplex operation or to GND for full-duplex operation.

What is the maximum number of transceivers supported on the bus?

Due to the 1/8-unit-load receiver input impedance, up to 256 transceivers can be connected on the bus.

Does the MAX1485 include a low-power shutdown mode?

No, the low-power shutdown mode is a feature exclusive to the MAX1481 variant within this family.