Integrated
Circuit
Systems, Inc.
ICS840002I
F
EMTO
C
LOCKS
™ C
RYSTAL
-
TO
-
LVCMOS/LVTTL F
REQUENCY
S
YNTHESIZER
F
EATURES
• 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
G
ENERAL
D
ESCRIPTION
The ICS840002I is a 2 output LVCMOS/LVTTL
ICS
Synthesizer optimized to generate Fibre Channel
HiPerClockS™
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.
F
REQUENCY
S
ELECT
F
UNCTION
T
ABLE
Input Frequency
(MHz)
26.5625
26.5625
26.5625
26.5625
26.04166
Inputs
F_SEL1
0
0
1
1
0
F_SEL0
0
1
0
1
1
M Divider Value
24
24
24
24
24
N Divider Value
3
4
6
12
4
M/N Ratio Value
8
6
4
2
6
Output Frequency
(MHz)
212.5
159.375
106.25
53.125
156.25
B
LOCK
D
IAGRAM
OE
Pullup
F_SEL1:0 Pullup:Pullup
nPLL_SEL Pulldown
nXTAL_SEL
Pulldown
P
IN
A
SSIGNMENT
2
F_SEL0
nXTAL_SEL
TEST_CLK
OE
MR
nPLL_SEL
V
DDA
V
DD
Q0
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
F_SEL1
GND
GND
Q0
Q1
V
DDO
XTAL_IN
XTAL_OUT
XTAL_IN 26.5625MHz
OSC
XTAL_OUT
TEST_CLK Pulldown
0
F_SEL1:0
1
Phase
Detector
00
01
10
11
1
VCO
0
N
÷3
÷4
÷6
÷12
(default)
ICS840002I
16-Lead TSSOP
4.4mm x 5.0mm x 0.92mm
package body
G Package
Top View
Q1
M = ÷24 (fixed)
MR
840002AGI
Pulldown
www.icst.com/products/hiperclocks.html
REV. A MARCH 10, 2005
1
ICS [ INTEGRATED CIRCUIT SYSTEMS ]
