843022I-02 Datasheet, PDF (1/17 Pages) Integrated Device Technology – FemtoClock® Crystal-to-3.3V, 2.5V LVPECL Clock Generator

FemtoClock^® Crystal-to-3.3V, 2.5V LVPECL
Clock Generator
843022I-02
DATA SHEET
GENERAL DESCRIPTION
The 843022I-02 is a Gigabit Ethernet Clock Generator. The
843022I-02 uses a 25MHz crystal to synthesize 125MHz
or 62.5MHz. The 843022I-02 has excellent phase jitter per-
formance, over the 12kHz – 20MHz integration range. The
843022I-02 is packaged in a small 16-pin VFQFN, making it ideal
for use in systems with limited board space.
FEATURES
• One differential 3.3V or 2.5V LVPECL output
• Crystal oscillator interface designed for 25MHz,
18pF parallel resonant crystal
• Output frequencies: 125MHz or 62.5MHz (selectable)
• RMS phase jitter @ 125MHz, using a 25MHz crystal
(12kHz - 20MHz): 0.57ps (typical)
• Full 3.3V or 2.5V operating supply
• -40°C to 85°C ambient operating temperature
• Available in lead-free (RoHS 6) packaging
• For functional replacement part use 8T49N241
FUNCTION TABLE
Inputs
FREQ_SEL
0
1
Output Frequencies
(with a 25MHz crystal)
125MHz
62.5MHz
BLOCK DIAGRAM
FREQ_SEL ^Pulldown
XTAL_IN ^25MHz
XTAL_OUT
OSC
Phase
Detector
VCO
PWR_DN ^Pullup
M = ÷25 (fixed)
÷5 0
÷10 1
PIN ASSIGNMENT
16 15 14 13
PWR_DN 1
12 Q
XTAL_OUT 2
11 ^nQ
XTAL_IN 3
10 VCCO
VEE 4
9 VCC
5678
Q
nQ
843022I-02
16-Lead VFQFN
3mm x 3mm x 0.925 package body
K Package
Top View
843022I-02 REVISION A 11/4/15
1
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