SY56028XRMG

Clock Buffers, Drivers Overview

The SY56028XRMG is a fully differential, low voltage CML 4:1 multiplexer with input equalization and an integrated 1:2 fanout buffer. It processes clock signals up to 4.5GHz or data patterns up to 6.4Gbps. The device operates from a 2.5V ±5% core supply (VCC) and a selectable 1.2V, 1.8V, or 2.5V ±5% output supply (VCCO). It features Micrel’s unique 3-pin input termination architecture for DC-coupled LVPECL, CML, or LVDS signals, and includes an internal voltage reference for AC-coupled applications. The part is guaranteed over the industrial temperature range of –40°C to +85°C.

Clock Buffers, Drivers Feature Summary

• Supports throughput rates up to 6.4Gbps with propagation delay under 360ps and within-device skew less than 15ps.
• Features ultra-low jitter performance with random jitter below 0.8ps RMS and deterministic jitter below 10ps peak-to-peak.
• Includes a three-level EQ input for adjustable signal equalization based on transmission line length.
• Accepts differential input voltages as small as 200mV (400mVpp) applied before FR4 transmission lines.

Clock Buffers, Drivers Applications

• Data distribution systems
• SONET clock and data distribution
• Fiber Channel clock and data distribution
• Gigabit Ethernet clock and data distribution

Clock Buffers, Drivers Procurement Notes

Verify that the component matches the specific package type and lead finish requirements for your design. Confirm the operating temperature range aligns with your system's environmental specifications. Ensure power supply decoupling capacitors are placed close to the VCC and VCCO pins as recommended in the datasheet to maintain signal integrity and stable operation.

Clock Buffers, Drivers Selection Notes

Select this component when a high-speed CML multiplexer with integrated fanout and equalization is required. Ensure the design accommodates separate VCC and VCCO supplies, as the output swing depends on the VCCO voltage level. Verify that the input signal levels and transmission line characteristics match the supported interface types, such as LVPECL, CML, or LVDS, for optimal performance.

Clock Buffers, Drivers Part Context

The SY56028XRMG belongs to Micrel’s Precision Edge product line, which focuses on high-speed timing and signal processing solutions. This specific part number indicates the Industrial temperature grade version packaged in a 32-pin QFN format with NiPdAu lead finish. It is designed for demanding communication infrastructure applications requiring precise signal routing and low jitter performance.

Clock Buffers, Drivers Replacement Considerations

Check for direct pin-compatible replacements within the same family if different packaging options like tape and reel are needed. Verify that any substitute maintains the same CML output standards and equalization capabilities to ensure compatibility with existing circuit designs without requiring schematic changes.

Clock Buffers, Drivers FAQ

How does the EQ input affect the device operation?

The EQ input provides three-level control for input equalization. A LOW state corresponds to a 9-inch FR4 stripline, FLOAT to 18 inches, and HIGH to 27 inches, allowing the device to compensate for signal loss over different transmission line lengths.

What is the recommended output termination for VCCO at 1.2V?

For a VCCO of 1.2V, the outputs should be terminated with 50 Ohms to 1.2V. Using 100 Ohms differentially across the outputs is not recommended for this voltage level.

Can the device handle AC-coupled inputs?

Yes, the SY56028XRMG supports AC-coupled inputs. An internal voltage reference is provided for input bias, and the VT pin should be bypassed with a 0.1µF low ESR capacitor to VCC for AC coupling applications.