PRELIMINARY
ICS8422002I-01
Integrated
Circuit
Systems, Inc.
FEMTOCLOCKS™ CRYSTAL-TO-
LVHSTL FREQUENCY SYNTHESIZER
GENERAL DESCRIPTION
FEATURES
The ICS8422002I-01 is a 2 output LVHSTL • Two LVHSTL outputs (VOHmax = 1.2V)
ICS
HiPerClockS™
Synthesizer optimized to generate Ethernet
• Selectable crystal oscillator interface
reference clock frequencies and is a member of
or LVCMOS/LVTTL single-ended input
the HiPerClocksTM family of high performance
clock solutions from ICS. Using a 25MHz 18pF
• Supports the following output frequencies: 156.25MHz,
125MHz, 62.5MHz
parallel resonant crystal, the following frequencies can be
generated based on the 2 frequency select pins (F_SEL[1:0]):
156.25MHz, 125MHz and 62.5MHz. The ICS8422002I-01
uses ICS’ 3rd generation low phase noise VCO technology
and can achieve 1ps or lower typical rms phase jitter, easily
meeting Ethernet jitter requirements.The ICS8422002I-01 is
packaged in a small 20-pin TSSOP package.
• VCO range: 560MHz - 680MHz
• RMS phase jitter @ 156.25MHz, using a 25MHz crystal
(1.875MHz - 20MHz): 0.44ps (typical)
• Power supply modes:
Core/Output
3.3V/1.8V
2.5V/1.8V
• -40°C to 85°C ambient operating temperature
• Available in both standard and lead-free RoHS compliant
packages
FREQUENCY SELECT FUNCTION TABLE
PIN ASSIGNMENT
nc
VDDO
Q0
VDDO
1
20
19
18
17
16
15
14
13
12
11
Q1
2
Output Frequency
M Divider N Divider
nQ1
3
(25MHz Ref.)
F_SEL1 F_SEL0
GND
VDD
nQ0
MR
Value
Value
4
5
0
0
1
1
0
1
0
1
25
4
156.25
125
nXTAL_SEL
TEST_CLK
XTAL_IN
XTAL_OUT
F_SEL1
nPLL_SEL
nc
VDDA
F_SEL0
VDD
6
7
8
9
25
25
5
10
62.5
not used
not used
10
ICS8422002I-01
20-Lead TSSOP
6.5mm x 4.4mm x 0.92mm
BLOCK DIAGRAM
F_SEL[1:0]
package body
G Package
Top View
Pulldown
2
Pulldown
nPLL_SEL
Q0
F_SEL[1:0]
0 0 ÷4
nQ0
Pulldown
TEST_CLK
1
0
1
0
0 1 ÷5
25MHz
XTAL_IN
1 0 ÷10
1 1 Not Used
Q1
Phase
Detector
VCO
OSC
nQ1
XTAL_OUT
Pulldown
nXTAL_SEL
M = 25 (fixed)
Pulldown
MR
The Preliminary Information presented herein represents a product in prototyping or pre-production.The noted characteristics are based on initial
product characterization. Integrated Circuit Systems, Incorporated (ICS) reserves the right to change any circuitry or specifications without notice.
8422002AGI-01
www.icst.com/products/hiperclocks.html
REV.B NOVEMBER 14, 2005
1