GENERAL DESCRIPTION
The 840004 is a 4 output LVCMOS/LVTTL 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 26.5625MHz, 18pF parallel resonant crystal, the
following frequencies can be generated based on the 2 frequency
select pins (F_SEL1:0): 212.5MHz, 159.375MHz, 156.25MHz,
106.25MHz, and 53.125MHz. The 840004 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 840004 is packaged in a small 20-pin TSSOP
package.

FEATURES
• Four LVCMOS/LVTTL outputs, 17Ω typical output impedance
• Selectable crystal oscillator interface
or LVCMOS single-ended input
• Supports the following input frequencies: 212.5MHz,
159.375MHz, 156.25MHz, 106.25MHz and 53.125MHz
• VCO range: 560MHz - 700MHz
• RMS phase jitter @ 212.5MHz (637kHz - 10MHz):
0.49ps typical, VDDO = 3.3V
Phase noise:
Offset Noise Power
100Hz ................-88.8 dBc/Hz
1kHz ..............-109.0 dBc/Hz
10kHz ..............-116.1 dBc/Hz
100kHz ..............-117.5 dBc/Hz
• Full 3.3V or mixed 3.3V core/2.5V output supply mode
• 0°C to 70°C ambient operating temperature
• Available in lead-free (RoHS 6) package