ICS8422002I Datasheet, PDF (1/13 Pages) Integrated Circuit Systems – FEMTOCLOCKS™ CRYSTAL-TO-LVHSTL FREQUENCY SYNTHESIZER

Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS8422002I
FEMTOCLOCKS™ CRYSTAL-TO-
LVHSTL FREQUENCY SYNTHESIZER
GENERAL DESCRIPTION
The ICS8422002I is a 2 output LVHSTL
ICS
Synthesizer optimized to generate Fibre
HiPerClockS™ _{Channel reference clock frequencies and is a}
member of the HiPerClocks^TM family of high
performance clock solutions from ICS. Using
a 26.5625MHz 18pF parallel resonant crystal, the following
frequencies can be generated based on the 2 frequency
select pins (F_SEL[1:0]): 212.5MHz, 187.5MHz,
159.375MHz, 106.25MHz and 53.125MHz. The
ICS8422002I uses ICS’ 3^rd generation low phase noise
VCO technology and can achieve 1ps or lower typical rms
phase jitter, easily meeting Fibre Channel jitter
requirements. The ICS8422002I is packaged in a 20-pin
TSSOP package.
FEATURES
• Two LVHSTL outputs (VOHmax = 1.2V)
• Selectable crystal oscillator interface
or LVCMOS/LVTTL single-ended input
• Supports the following output frequencies: 212.5MHz,
187.5MHz, 159.375MHz, 106.25MHz, 53.125MHz
• VCO range: 560MHz - 680MHz
• RMS phase jitter @ 212.5MHz, using a 26.5625MHz crystal
(637kHz - 10MHz): 0.59ps (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
Input
Frequency
(MHz)
26.5625
26.5625
26.5625
26.5625
23.4375
F_SEL1 F_SEL0
0
0
0
1
1
0
1
1
0
0
Inputs
M Divider N Divider
Value
Value
24
3
24
4
24
6
24
12
24
3
Output
M/N
Frequency
Divider Value ^(MHz)
8
212.5
6
159.375
4
106.25
2
53.125
8
187.5
BLOCK DIAGRAM
F_SEL[1:0] ^Pulldown
nPLL_SEL ^Pulldown
TEST_CLK ^Pulldown
1
26.5625MHz
XTAL_IN
OSC
0
XTAL_OUT
nXTAL_SEL ^Pulldown
2
Phase
Detector
1
VCO
0
F_SEL[1:0]
0 0 ÷3
0 1 ÷4
1 0 ÷6
1 1 ÷12
PIN ASSIGNMENT
nc ₁
2 0 ^VDDO
VDDO ₂
19 ^Q1
Q0 _{3 18} nQ1
nQ0 4 17 GND
MR 5
16 ^VDD
nPLL_SEL 6 15 nXTAL_SEL
nc 7 14 TEST_CLK
VDDA 8
13 ^XTAL_IN
F_SEL0 9 12 XTAL_OUT
VDD 10 11 F_SEL1
ICS8422002I
20-Lead TSSOP
6.5mm x 4.4mm x 0.92mm
package body
G Package
Top View
Q0
nQ0
Q1
nQ1
M = 24 (fixed)
MR ^Pulldown
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
www.icst.com/products/hiperclocks.html
REV. B NOVEMBER 14, 2005
1