MAX3055ASD

Overview

The MAX3055ASD is a ±80V fault-protected CAN transceiver designed for 125kbps data rates. It operates on a single +5V supply (4.75V to 5.25V) and supports an extended battery voltage range of -0.3V to +80V. The device features built-in slope control for unshielded cable applications and guarantees full wake-up capability during failure modes. It includes thermal shutdown, overcurrent protection, and three low-power modes accessible via STB and EN pins. The component is housed in a 14-pin SO package and functions within a temperature range of -40°C to +125°C.

Feature Summary

• Supports single-wire transmission mode with ground offset voltages up to 1.5V
• Provides ±80V fault protection and tolerance on CANH and CANL bus lines
• Includes built-in slope control to minimize EMI and allow use of unshielded cables
• Features low-current sleep and standby modes with wake-up through bus lines

Applications

• Industrial HVAC systems
• Controller Area Network (CAN) physical layer interfaces
• Automotive electronic control units

Procurement Notes

Verify the specific ordering suffix against official documentation to confirm lead-free status and RoHS compliance. Confirm that the package type matches the required 14-SO footprint. Ensure the operating temperature range aligns with the system's environmental requirements before finalizing procurement.

Selection Notes

Select the MAX3055ASD specifically for applications requiring a 125kbps data rate. Unlike the MAX3054, this variant includes slew-rate limiting suitable for longer or unshielded twisted-pair cables. Verify compatibility with the host controller's logic levels and ensure the external termination resistors are correctly connected to the RTH and RTL pins for proper biasing.

Part Context

The MAX3055ASD belongs to the MAX3054/MAX3055/MAX3056 family of fault-protected CAN transceivers manufactured by Analog Devices/Maxim Integrated. This family shares pinout and functional compatibility with industry-standard parts like the TJA1054. The MAX3055 specifically targets the 125kbps segment of the CAN protocol spectrum.

Replacement Considerations

The MAX3055ASD is pin and functionally compatible with the NXP TJA1054. When substituting, verify that the replacement part supports the same ±80V fault tolerance and 125kbps data rate specifications.

FAQ

How does the MAX3055 handle bus failures?

The device detects various wiring failures (such as shorts to battery, ground, or VCC) and switches to single-wire mode to maintain communication. It also provides a wake-up capability during these failure modes.

What is the purpose of the INH pin?

The INH pin is an output used to deactivate an external voltage regulator. It goes high during wake-up or power-up events to allow the regulator to be shut down during sleep mode, reducing overall power consumption.

Does the MAX3055 support unshielded cables?

Yes, the MAX3055 includes a built-in slope-control feature that limits the slew rate. This minimizes electromagnetic interference (EMI) and reduces reflections, allowing for reliable operation with unshielded twisted-pair cables.