
DATA SHEET
ICS840022AKI-02 REVISION B SEPTEMBER 27, 2010
1
2010 Integrated Device Technology, Inc.
FemtoClock Crystal-to-LVCMOS/LVTTL
Clock Generator
ICS840022I-02
General Description
The ICS840022I-02 is a Gigabit Ethernet Clock Generator. The
ICS840022I-02 uses a 25MHz crystal to synthesize 125MHz or
62.5MHz. The ICS840022I-02 has excellent phase jitter
performance, over the 12kHz – 20MHz integration range. The
ICS840022I-02 is packaged in a small 16-pin VFQFN, making it
ideal for use in systems with limited board space.
Features
One LVCMOS/LVTTL outputs, 20 output impedance
Crystal oscillator interface designed for 25MHz,
18pF parallel resonant crystal
Output frequencies: 125MHz or 62.5MHz
RMS phase jitter at 125MHz using a 25MHz crystal
(12kHz - 20MHz): 0.57ps (typical)
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
Function Table
Inputs
Output Frequency Range (with a 25MHz crystal)
FREQ_SEL
0
125MHz
1
62.5MHz
OSC
Phase
Detector
VCO
M = ÷25 (fixed)
0
1
÷10
÷5
Q
XTAL_IN
XTAL_OUT
FREQ_SEL Pulldown
PWR_DN Pullup
25MHz
5
6
7
8
16 15 14 13
1
2
3
4
12
11
10
9
PWR_DN
XTAL_OUT
XTAL_IN
GND
Q
nc
VDDO
VDD
GND
nc
FREQ_SEL
GND
nc
GND
V
DD
ICS840022I-02
16 Lead VFQFN
3mm x 3mm x 0.925 package body
K Package
Top View
Pin Assignment
Block Diagram