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