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ICS840002I fiches techniques PDF

Integrated Circuit Systems - CRYSTAL-TO LVCMOS/LVTTL FREQUENCY SYNTHESIZER

Numéro de référence ICS840002I
Description CRYSTAL-TO LVCMOS/LVTTL FREQUENCY SYNTHESIZER
Fabricant Integrated Circuit Systems 
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ICS840002I fiche technique
Integrated
Circuit
Systems, Inc.
ICS840002I
FEMTOCLOCKS™CRYSTAL-TO-
LVCMOS/LVTTL FREQUENCY SYNTHESIZER
GENERAL DESCRIPTION
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 HiPerClocksTM 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
www.DataShee5t43U.1.c2o5mMHz.The ICS840002I uses ICS’ 3rd 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.
FREQUENCY SELECT FUNCTION TABLE
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
Input Frequency
(MHz)
26.5625
26.5625
26.5625
26.5625
26.04166
F_SEL1
0
0
1
1
0
F_SEL0
0
1
0
1
1
Inputs
M Divider Value N Divider Value
24 3
24 4
24 6
24 12
24 4
M/N Ratio Value
8
6
4
2
6
Output Frequency
(MHz)
212.5
159.375
106.25
53.125
156.25
BLOCK DIAGRAM
OE Pullup
F_SEL1:0 Pullup:Pullup
nPLL_SEL Pulldown
nXTAL_SEL Pulldown
XTAL_IN 26.5625MHz
OSC 0
XTAL_OUT
TEST_CLK Pulldown
1
2
Phase
Detector
VCO
F_SEL1:0
1N
0 0 ÷3
0 1 ÷4
0 1 0 ÷6
1 1 ÷12 (default)
M = ÷24 (fixed)
PIN ASSIGNMENT
F_SEL0 1 16 F_SEL1
nXTAL_SEL 2 15 GND
TEST_CLK 3 14 GND
OE 4 13 Q0
MR 5 12 Q1
nPLL_SEL 6
1 1 VDDO
VDDA 7
10 XTAL_IN
VDD 8
9 XTAL_OUT
Q0
ICS840002I
16-Lead TSSOP
Q1 4.4mm x 5.0mm x 0.92mm
package body
G Package
Top View
MR Pulldown
840002AGI
www.icst.com/products/hiperclocks.html
1
REV. A MARCH 10, 2005

PagesPages 13
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