Integrated
Circuit
Systems, Inc.
840002AGI www.icst.com/products/hiperclocks.html REV. A MARCH 10, 2005
1
ICS840002I
FEMTOCLOCKS™ C RYSTAL-TO-
LVCMOS/LVTTL FREQUENCY SYNTHESIZER
GENERAL DESCRIPTION
The ICS840002I is a 2 output LVCMOS/LVTTL
Synthesizer optimized to generate Fibre 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_SEL1:0):
212.5MHz, 159.375MHz, 156.25MHz, 106.25MHz, and
53.125MHz. The ICS840002I 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 ICS840002I is packaged in a 16-pin TSSOP package.
HiPerClockS™
ICS
BLOCK DIAGRAM PIN ASSIGNMENT
F_SEL0
nXTAL_SEL
TEST_CLK
OE
MR
nPLL_SEL
VDDA
VDD
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
F_SEL1
GND
GND
Q0
Q1
VDDO
XTAL_IN
XTAL_OUT
ICS840002I
16-Lead TSSOP
4.4mm x 5.0mm x 0.92mm
package body
G Package
Top View
FEATURES
Two LVCMOS outputs @ 3.3V, 17Ω typical output impedance
Selectable crystal oscillator interface
or LVCMOS single-ended input
Output frequency range: 46.66MHz - 233.33MHz
VCO range: 560MHz - 700MHz
Supports the following output frequencies: 212.5MHz,
159.375MHz, 156.25MHz, 106.25MHz and 53.125MHz
RMS phase jitter @ 212.5MHz (637KHz - 10MHz):
0.83ps (typical)
Typical phase noise at 212.5MHz:
Offset Noise Power
100Hz ............... -91.3 dBc/Hz
1KHz ..............-114.3 dBc/Hz
10KHz ..............-120.7 dBc/Hz
100KHz ..............-120.2 dBc/Hz
Power supply modes:
Core/Output
3.3V/3.3V
3.3V/2.5V
2.5V/2.5V
-40°C to 85°C ambient operating temperature
Lead-Free package RoHS compliant
Q0
Q1
OE
F_SEL1:0
nPLL_SEL
nXTAL_SEL
XTAL_IN
XTAL_OUT
TEST_CLK
MR
OSC
Phase
Detector
VCO
M = ÷24 (fixed)
F_SEL1:0
0 0 ÷3
0 1 ÷4
1 0 ÷6
1 1 ÷12 (default)
0
1
1
0
2
N
26.5625MHz
Pullup
Pulldown
Pulldown
Pulldown
Pullup:Pullup
Pulldown
FREQUENCY SELECT FUNCTION TABLE
ycneuqerFtupnI
)zHM(
stupnI
ycneuqerFtuptuO
)zHM(
1LES_F0LES_FeulaVrediviDMeulaVrediviDNeulaVoitaRN/M
5265.62004238 5.212
5265.6 1246 73.951
5265.62104264 2.601
5265.6 12212 521.35
66140.620 4246 2.651