The Microchip SY100EL33LZG-TR is a single-element divide-by-4 prescaler in the 100EL series, built for high-speed clock and data-division applications. It accepts a 4.2 GHz maximum count rate, making it suitable for PLL feedback dividers, SERDES reference paths, and RF/IF clock trees in telecom infrastructure, test equipment, and high-speed data converters. The part operates from a 3.3 V to 5 V supply, bridging legacy 5 V ECL systems and modern 3.3 V logic families. The asynchronous reset (active-low, per the 100EL convention) clears the divider immediately, independent of the clock edge — useful for deterministic power-up states or gated reset sequences.
The device triggers on both positive and negative clock edges, which is typical for ECL/PECL dividers and simplifies interfacing with differential clock sources (LVPECL, CML). The asynchronous reset is a glitch-sensitive line — if the reset input is left floating or driven by a slow-edge signal, the divider may exhibit metastable behavior at power-up. In practice, tie the reset to a clean logic-high through a pull-up resistor if unused, or sequence it from a supervisory IC that holds reset during supply ramp. The 3.3 V to 5 V supply range means the same part can be used in both 3.3 V PECL and 5 V ECL environments, but the input thresholds scale with VCC — verify the logic levels of the driving source against the datasheet's VOH/VOL tables for your supply voltage.
Sourcing and lifecycle — what to expect
Microchip continues to manufacture this series, so no last-time-buy or end-of-life risk is currently flagged.