SY89829UHI

Clock Buffers, Drivers Overview

The SY89829UHI is a high-performance dual 1:10 or single 1:20 LVPECL clock driver manufactured by Micrel. It operates on 2.5V or 3.3V supplies and accepts multiplexed LVDS or LVPECL inputs via the CLK_SEL pin. The device features an internal 100Ω termination for LVDS inputs, eliminating external components. It guarantees AC parameters including a maximum toggle frequency (fMAX) of 2 GHz, within-device skew of 35 ps, and part-to-part skew of 200 ps across the -40°C to +85°C industrial temperature range.

Clock Buffers, Drivers Feature Summary

• Dual 1:10 fanout buffer/translator with synchronous output enable
• Multiplexed inputs supporting redundant clock switchover between LVDS and LVPECL
• Internal 100Ω differential termination for LVDS inputs
• Guaranteed performance up to 2 GHz fMAX with <50ps ch-ch skew

Clock Buffers, Drivers Applications

• High-performance PCs and workstations
• Parallel processor-based systems
• Redundant LVPECL or LVDS bus clock switchover
• Communications infrastructure

Clock Buffers, Drivers Procurement Notes

Verify component authenticity through authorized channels as the device originates from Micrel. Confirm that the ordering suffix 'HI' corresponds to the H64-1 package type with Sn-Pb lead finish and industrial operating range. Ensure compliance with RoHS directives if lead-free variants are required for specific manufacturing processes.

Clock Buffers, Drivers Selection Notes

Select this component when precise timing alignment is critical for driving multiple destinations simultaneously. The integrated mux simplifies redundant clock designs by allowing seamless switching between two reference sources. Verify that the PCB layout supports the 64-pin EPAD-TQFP package and provides adequate thermal dissipation for the exposed pad.

Clock Buffers, Drivers Part Context

This part belongs to the Precision Edge series of high-speed clock distribution devices. Originally developed by Micrel, Inc., it serves as a specialized solution for low-voltage applications requiring large fanout counts without compromising signal integrity or introducing excessive skew compared to standard products.

Clock Buffers, Drivers Replacement Considerations

Check for updated Pb-Free versions such as the SY89829UHY if environmental regulations prohibit lead usage. Ensure any substitute maintains the same 64-pin TQFP footprint and electrical characteristics to avoid redesigning the termination network.

Clock Buffers, Drivers FAQ

How does the device handle input selection?

Input selection is managed via the CLK_SEL pin, which allows the user to choose between LVDS or LVPECL inputs. This enables flexible integration into systems using different signaling standards.

What is the purpose of the synchronous OE pin?

The synchronous Output Enable (OE) pin ensures outputs are only enabled or disabled when they are in the LOW state. This prevents the generation of runt clock pulses during state transitions.

Does the LVDS input require external termination?

No, the LVDS inputs include an internal 100Ω termination across the input pair, which eliminates the need for external termination resistors.