General Description
The 8433625 is a 3 differential output LVPECL Synthesizer designed
to generate Ethernet reference clock frequencies. Using a 25MHz or
26.041666MHz, 18pF parallel resonant crystal, the following
frequencies can be generated based on the settings of 4 frequency
select pins (DIV_SELA[1:0], DIV_SELB[1:0]): 625MHz, 312.5MHz,
156.25MHz, and 125MHz. The 8433625 has 2 output banks, Bank A
with 1 differential LVPECL output pair and Bank B with 2 differential
LVPECL output pairs.
The two banks have their own dedicated frequency select pins and
can be independently set for the frequencies mentioned above. The
8433625 uses 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 8433625 is packaged in a small
24-pin TSSOP package.

Features
• Three 3.3V LVPECL outputs on two banks, A Bank with one
LVPECL pair and B Bank with 2 LVPECL output pairs
• Using a 25MHz or 26.041666 crystal, the two output banks can be
independently set for 625MHz, 312.5MHz, 156.25MHz or 125MHz
• Selectable crystal oscillator interface
or LVCMOS/LVTTL single-ended input
• VCO range: 520MHz – 680MHz
• RMS phase jitter @ 156.25MHz (1.875MHz - 20MHz):
0.3ps (typical)
• Full 3.3V supply mode
• 0°C to 70°C ambient operating temperature
• Available in lead-free (RoHS 6) package