GENERAL DESCRIPTION
The 8421002I-01 is a 2 output HSTL Synthesizer optimized to
generate Ethernet reference clock frequencies and is a member of
the HiPerClocksTM family of high performance clock solutions from
IDT. Using a 25MHz, 18pF parallel resonant crystal, the following
frequencies can be generated based on the 2 frequency select pins
(F_SEL[1:0]): 156.25MHz, 125MHz and 62.5MHz. The 8421002I-01
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 8421002I-01 is packaged in a small 20-pin
TSSOP package.

FEATURES
• Two HSTL outputs (VOHmax = 1.5V)
• Selectable crystal oscillator interface
or LVCMOS/LVTTL single-ended input
• Supports the following output frequencies: 156.25MHz,
125MHz, 62.5MHz
• VCO range: 560MHz - 680MHz
• RMS phase jitter @ 156.25MHz, using a 25MHz crystal
(1.875MHz - 20MHz): 0.44ps (typical)
• Power supply modes:
Core/Output
3.3V/1.8V
2.5V/1.8V
• -40°C to 85°C ambient operating temperature
• Available in lead-free (RoHS 6) compliant package