SY89218UHY

Clock Buffers, Drivers Overview

The SY89218UHY is a precision, high-speed clock divider and LVDS fanout buffer operating on a 2.5V supply. It features four independently controlled output banks providing a total of 15 LVDS outputs. The device supports a 2:1 multiplexer for two differential inputs (IN0, IN1) and allows each bank to be configured for pass-through (÷1), ÷2, or ÷4 division ratios. It handles input signals as small as 100mV via an integrated 3-pin termination architecture compatible with AC- or DC-coupled CML, PECL, and LVDS sources. Maximum operating frequency reaches 1.5GHz with less than 35ps within-bank skew.

Clock Buffers, Drivers Feature Summary

• Four independent LVDS output banks with programmable ÷1, ÷2, and ÷4 divide ratios
• Integrated 3-pin input termination accepting AC/DC coupled signals down to 100mV swing
• Ultra-low jitter performance: <1ps RMS random jitter and <10ps PP total jitter
• Fail-safe input circuitry prevents output oscillation during signal loss

Clock Buffers, Drivers Applications

• SONET/SDH systems
• Fibre Channel networks
• Gigabit Ethernet interfaces

Clock Buffers, Drivers Procurement Notes

Verify the package marking includes a Pb-Free bar-line indicator to confirm lead finish compliance. Confirm the specific suffix 'HY' corresponds to the T64-1 industrial temperature range variant. Ensure the design accounts for the internal 25kΩ pull-up resistors on control pins like /MR, EN, and CLK_SEL.

Clock Buffers, Drivers Selection Notes

Select this component when low-skew distribution across multiple banks is required alongside flexible clock division. The integrated input termination simplifies interface design for various logic families without external resistor networks. Verify that the 2.5V ±5% power supply constraint aligns with the system voltage rails.

Clock Buffers, Drivers Part Context

This part belongs to Micrel’s Precision Edge product family, designed for high-performance clock distribution. It serves as the LVDS-compatible counterpart to the SY89221U, which utilizes LVPECL outputs. Both devices share similar functional architectures including the 2:1 MUX and divider banks.

Clock Buffers, Drivers Replacement Considerations

The SY89221U is a related device offering identical functionality but with LVPECL outputs instead of LVDS. Designers must verify output compatibility with downstream receivers before substituting between these variants.