PRELIMINARY
FEMTOCLOCKS™ CRYSTAL-TO-
ICS8422002I-01
LVHSTL FREQUENCY SYNTHESIZER
General Description
Features
The ICS8422002I-01 is a 2 output LVHSTL
Synthesizer optimized to generate Ethernet
• Two LVHSTL outputs (VOHmax = 1.2V)
S
IC
• Selectable crystal oscillator interface or
HiPerClockS™
reference clock frequencies and is a member of the
LVCMOS/LVTTL single-ended input
TM
HiPerClocks family of high performance clock
• Supports the following output frequencies: 156.25MHz,
solutions from IDT. Using a 25MHz 18pF parallel
125MHz, 62.5MHz
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 IDT’s 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 (RoHS 5) and lead-free (RoHS 6)
packages
Pin Assignment
nc
VDDO
Q0
1
2
20
19
VDDO
Q1
3
4
18 nQ1
nQ0
17
16
15
14
13
GND
MR
nPLL_SEL
nc
5
6
7
VDD
nXTAL_SEL
REF_CLK
XTAL_IN
VDDA
F_SEL0
VDD
8
9
10
12 XTAL_OUT
F_SEL1
11
ICS422002I-01
20-Lead TSSOP
6.5mm x 4.4mm x 0.925mm package body
G Package
Block Diagram
Top View
2
Pulldown
Pulldown
F_SEL[1:0]
nPLL_SEL
Q0
F_SEL[1:0]
nQ0
Pulldown
25MHz
0 0 ÷4
REF_CLK
XTAL_IN
1
0
1
0
0 1 ÷5
1 0 ÷10
1 1 Not Used
Q1
Phase
Detector
VCO
OSC
nQ1
XTAL_OUT
nXTAL_SEL
Pulldown
Pulldown
M = 25 (fixed)
MR
The Preliminary Information presented herein represents a product in pre-production. The noted characteristics are based on initial product characterization and/or qualification.
Integrated Device Technology, Incorporated (IDT) reserves the right to change any circuitry or specifications without notice.
IDT™ / ICS™ LVHSTL FREQUENCY SYNTHESIZER
1
ICS8422002AGI-01 REV. C NOVEMBER 1, 2007