General Description

The 843251I-15 is an Ethernet Clock Generator. The 843251I-15

uses an 18pF parallel resonant crystal over the range of 23.2MHz -

30MHz. For Ethernet applications, a 25MHz crystal is used. The

843251I-15 uses IDT’s 3rd generation low phase noise VCO

technology, and can achieve <1ps rms phase jitter performance over

the 1.875MHz – 20MHz integration range. The 843251I-15 is

packaged in a small 8-pin TSSOP, making it ideal for use in systems

with limited board space.

Features

• One differential 3.3V LVPECL output pair

• Crystal oscillator interface, 18pF parallel resonant crystal

(23.2MHz – 30MHz)

• Output frequency range: 116MHz – 150MHz and

580MHz – 750MHz

• VCO range: 580MHz – 750MHz

• RMS phase jitter @ 125MHz, using a 25MHz crystal

(1.875MHz – 20MHz): 0.45ps (typical), 3.3V

• Full 3.3V or 2.5V supply modes

• -40°C to 85°C ambient operating temperature

• Available in lead-free (RoHS 6) package