General Description
The 843242 is a two differential output LVPECL Synthesizer
designed to generate Ethernet reference clock frequencies. Using a
31.25MHz or 26.041666MHz, 18pF parallel resonant crystal, the
following frequencies can be generated based on the settings of 4
frequency select pins (SELA[1:0], SELB[1:0]): 625MHz, 312.5MHz,
156.25MHz, and 125MHz.
The two banks have their own dedicated frequency select pins and
can be independently set for the frequencies mentioned above. The
843242 IDT’s 3rd generation low phase noise VCO technology and
can achieve 1ps or lower typical rms phase jitter, easily meeting
Ethernet jitter requirements. The 843242 is packaged in a small
16-pin TSSOP package.

Features
• Two differential LVPECL output pairs
• Using a 31.25MHz or 26.041666MHz crystal, the two output
banks can be independently set for 625MHz, 312.5MHz,
156.25MHz or 125MHz
• Crystal oscillator interface
• RMS Phase Jitter @ 625MHz, (1.875MHz – 20MHz) using a
25MHz crystal: 0.4ps (typical)
• Full 3.3V supply mode
• 0°C to 70°C ambient operating temperature
• Lead-free (RoHS 6) packaging