MAX3268CUB

Overview

The MAX3268CUB is a 1.25Gbps limiting amplifier designed for Gigabit Ethernet and Fibre Channel optical receiver systems. It operates from a +3.0V to +5.5V supply voltage and accepts a wide range of input voltages while providing constant-level output voltages with controlled edge speeds. The device features standards-compliant positive-referenced emitter-coupled logic (PECL) data outputs and is housed in a tiny 10-pin µMAX package with an exposed paddle, making it ideal for small-form-factor receivers.

Feature Summary

• Provides standards-compliant PECL data outputs suitable for small-form-factor applications
• Integrates RMS power detectors with programmable loss-of-signal indication
• Includes an optional squelch function that mutes the data output signal when input voltage falls below a programmable threshold
• Features excellent jitter performance and low deterministic jitter

Applications

• Gigabit Ethernet Optical Receivers
• Fibre Channel Optical Receivers
• ATM Optical Receivers
• System Interconnect

Procurement Notes

Verify the specific ordering suffix 'CUB' corresponds to the 10-pin µMAX package with an exposed paddle and the 0°C to +70°C temperature range. Confirm that the lead-free variant requires the '+' suffix (MAX3268CUB+). Ensure the application design accounts for the PECL output termination requirements specified in the datasheet.

Selection Notes

Select this component when a compact 10-pin footprint is required for optical receivers operating at 1.25Gbps. Choose this part over the TSSOP variants if space constraints dictate the use of the µMAX package. Verify that the system supports PECL output signaling rather than CML, which is provided by other members of the family.

Part Context

This component belongs to the MAX3264/MAX3265/MAX3268/MAX3269/MAX3765/MAX3768 family of limiting amplifiers. While the MAX3264/3265/3765 utilize CML outputs and a 16-pin TSSOP package, the MAX3268/3269/3768 variants specifically feature PECL outputs and are available in the smaller 10-pin µMAX package.

Replacement Considerations

The MAX3269CUB is a compatible alternative within the same package offering 2.5Gbps operation. The MAX3768CUB provides identical pinout and functionality but may differ in specific electrical characteristics or manufacturing revisions.