Integrated
Circuit
Systems, Inc.
ICS843021
F
EMTO
C
LOCKS
™ C
RYSTAL
-
TO
-
3.3V LVPECL C
LOCK
G
ENERATOR
F
EATURES
•
1 differential 3.3V LVPECL output
•
Crystal oscillator interface designed for 22.4MHz - 28MHz,
18pF parallel resonant crystal
•
Output frequency range: 112MHz - 140MHz
•
VCO range: 560MHz to 700MHz
•
Output duty cycle range: 49% - 51%
•
RMS phase jitter @ 125MHz, using a 25MHz crystal
(1.875MHz - 20MHz): 0.37ps (typical)
•
RMS phase noise at 125MHz (typical)
Offset
Noise Power
100Hz ............... -94.2 dBc/Hz
1KHz .............. -122.8 dBc/Hz
10KHz .............. -132.2 dBc/Hz
100KHz .............. -131.3 dBc/Hz
•
3.3V operating supply
•
0°C to 70°C ambient operating temperature
•
Industrial temperature information available upon request
•
Lead-Free package fully RoHS compliant
G
ENERAL
D
ESCRIPTION
The ICS843021 is a Gigabit Ethernet Clock
Generator and a member of the HiPerClocks
TM
HiPerClockS™
family of high performance devices from ICS. The
ICS843021 uses a 25MHz crystal to synthesize
125MHz. The ICS843021 has excellent phase jitter
performance, over the 1.875MHz – 20MHz integration range.
The ICS843021 is packaged in a small 8-pin TSSOP, making it
ideal for use in systems with limited board space.
ICS
F
REQUENCY
T
ABLE
- T
YPICAL
A
PPLICATIONS
Inputs
Crystal Frequency (MHz)
25
26.6
Output Frequency (MHz)
12 5
133
B
LOCK
D
IAGRAM
25MHz
XTAL_IN
P
IN
A
SSIGNMENT
V
CCA
V
EE
XTAL_OUT
XTAL_IN
1
2
3
4
8
7
6
5
V
CC
Q0
nQ0
nc
OSC
XTAL_OUT
Phase
Detector
VCO
÷5
nQ0
Q0
ICS843021
÷25
(fixed)
8-Lead TSSOP
4.40mm x 3.0mm x 0.925mm package body
G Package
Top View
843021AG
www.icst.com/products/hiperclocks.html
1
REV. C MARCH 31, 2005
ICS [ INTEGRATED CIRCUIT SYSTEMS ]
