SY89809ALTZ

Clock Buffers, Drivers Overview

The SY89809ALTZ is a high-performance bus clock driver featuring nine differential HSTL output pairs. Designed for low-voltage applications, it operates with a 3.3V core supply and a 1.8V output supply to reduce power consumption. The device accepts multiplexed inputs from either HSTL or LVPECL logic levels via the CLK_SEL pin. It supports maximum clock frequencies up to 750MHz while maintaining low part-to-part skew of 100ps typical and pin-to-pin skew of 15ps typical. The Output Enable function is synchronous to prevent runt clock pulses.

Clock Buffers, Drivers Feature Summary

• Nine differential HSTL output pairs driving 50Ω-to-ground loads without offset voltage
• Multiplexed input selection between HSTL and LVPECL using the LVTTL-compatible CLK_SEL pin
• Synchronous Output Enable (OE) prevents glitching by disabling outputs only during the LOW state
• Low skew performance with 15ps typical pin-to-pin skew and 100ps typical part-to-part skew

Clock Buffers, Drivers Applications

• High-performance PCs
• Workstations
• Parallel processor-based systems
• Other high-performance computing environments
• Communications equipment

Clock Buffers, Drivers Procurement Notes

Verify the specific ordering suffix when sourcing components. The 'ALTZ' designation indicates a commercial operating temperature range and a Pb-Free package with Matte-Sn lead finish. Confirm whether the required inventory is in Tape and Reel format (suffix TR) or standard packaging, as this affects handling procedures but does not alter the electrical functionality.

Clock Buffers, Drivers Selection Notes

Select this component for designs requiring precise alignment of ultra-low skew signals across multiple destinations. Ensure the design accommodates separate 3.3V and 1.8V power rails, as the core and output supplies are distinct. Verify that input signal swings meet the specified requirements for both HSTL and LVPECL modes, and confirm that termination resistors are placed correctly at the load side for the HSTL outputs.

Clock Buffers, Drivers Part Context

This device belongs to the Precision Edge family of clock drivers manufactured by Micrel, which was acquired by Microchip Technology. The SY89809AL series provides high-speed clock distribution solutions optimized for low-voltage digital systems. The ALTZ variant specifically denotes the commercial grade version housed in a 32-pin TQFP package suitable for surface-mount assembly.

Clock Buffers, Drivers Replacement Considerations

Public confirmed substitute part numbers: None.