MAX3045BCUE+

Overview

The MAX3045BCUE+ is a quad RS-485/RS-422 transmitter designed for digital data transmission over twisted-pair balanced lines. It operates from a single +5V supply (4.75V to 5.25V) and supports data rates up to 20Mbps. The device features ±10kV Human Body Model ESD protection on all outputs and withstands ±4kV Electrical Fast Transient/Burst stress per IEC 1000-4-4. It includes hot-swap capability to prevent false transitions during power-up or insertion. The component is housed in a 16-pin TSSOP package with an operating temperature range of 0°C to +70°C.

Feature Summary

• Hot-swap capability prevents erroneous data transfer during board insertion or power-up sequences.
• Robust output protection against electrostatic discharge and electrical fast transients.
• Low-power shutdown mode significantly reduces current consumption when disabled.
• Pin-compatible with industry-standard 'SN75174 and 'DS26LS31C devices.

Applications

• Telecommunications equipment
• Industrial motor control systems
• Transmitter applications requiring ESD sensitivity
• Hand-held industrial equipment
• Industrial PLC networks

Procurement Notes

Verify the specific suffix 'BCUE+' corresponds to the commercial temperature range and tape-and-reel packaging format required for your assembly process. Confirm that the ordering information matches the exact pinout and enable logic defined for the MAX3045B variant within the official datasheet.

Selection Notes

Select this component when high-speed data rates up to 20Mbps are required alongside robust transient immunity. Ensure the application environment remains within the 0°C to +70°C commercial temperature limits. Verify that the system utilizes a single +5V supply compatible with the specified voltage range.

Part Context

This part belongs to the MAX3040–MAX3045 family of quad 5V RS-485/RS-422 transmitters. The MAX3045B specifically denotes the 20Mbps speed grade, distinguishing it from the 2.5Mbps and 250kbps variants in the same series. It serves as a low-power, ESD-protected upgrade to legacy interface standards.

Replacement Considerations

The MAX3045BEUE+ is the extended temperature (-40°C to +85°C) equivalent. For lower data rate requirements, consider the MAX3044CUE+ (2.5Mbps). Legacy replacements include the SN75174 and DS26LS31C, though these lack the integrated ESD protection and hot-swap features.

FAQ

How does the hot-swap feature function during power-up?

The hot-swap inputs hold the transmitter enable pins in a disabled state while VCC ramps up, preventing false transitions on the data cable caused by leakage currents or parasitic capacitance before the processor initializes.

What is the difference between the MAX3045B and MAX3044?

The MAX3045B is optimized for data transfer rates up to 20Mbps, whereas the MAX3044 is slew-rate limited to 2.5Mbps to minimize EMI and reflections on improperly terminated cables.

How is the device enabled or disabled?

For the MAX3045B, all four transmitters are enabled when EN is logic high and EN_ is logic low. They enter a low-power shutdown state when EN is pulled low and EN_ is driven high.