What this 155.52 MHz oscillator brings to the clock tree
The Texas Instruments LMK61E0-155M52SIAR is a clock oscillator delivering a fixed 155.52 MHz output — the standard reference frequency for Synchronous Ethernet (SyncE) and SONET/SDH line cards. Housed in a 6-QFM (7x5) package, it operates from a 3.135 V to 3.465 V supply rail and draws 162 mA typical.
Supplied in Tape & Reel (TR) packaging, consistent with high-volume pick-and-place assembly.
The 6-QFM (7x5) surface-mount module has a 7 mm × 5 mm footprint — a compact outline that fits into the same land pattern as standard 7×5 mm clock oscillators, easing layout reuse.