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