General Description
The 840002I-01 is a two output LVCMOS/LVTTL Synthesizer
optimized to generate Ethernet reference clock frequencies. Using a
25MHz 18pF parallel resonant crystal, the following frequencies can
be generated based on the two frequency select pins (F_SEL[1:0]):
156.25MHz, 125MHz, and 62.5MHz. The 840002I-01 uses IDT’s 3RD
generation low phase noise VCO technology and can achieve 1ps or
lower typical random rms phase jitter, easily meeting Ethernet jitter
requirements. The 840002I-01 is packaged in a small 16-pin TSSOP
package.

Features
• Two LVCMOS/LVTTL outputs@ 3.3V,
17 typical output impedance
• Selectable crystal oscillator interface or LVCMOS/LVTTL
single-ended TEST_CLK
• Supports the following output frequencies: 156.25MHz, 125MHz
and 62.5MHz
• Output frequency range: 56MHz to 175MHz
• VCO range: 560MHz to 700MHz
• Output skew: 12ps (maximum)
• RMS phase jitter at 156.25MHz, (1.875MHz to 20MHz):
0.47ps (typical)
Phase Noise:
Offset Noise Power
100Hz................ -97.4 dBc/Hz
1kHz .................. -120.2 dBc/Hz
10kHz ................ -127.6 dBc/Hz
100kHz .............. -126.1 dBc/Hz
• Power Supply Modes:
Core / Output
3.3V / 3.3V
3.3V / 2.5V
2.5V / 2.5V
• -40°C to 85°C ambient operating temperature
• Available in lead-free (RoHS 6) package