ICS843004-02 Datasheet, PDF (1/12 Pages) Integrated Circuit Systems – CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER

Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS843004-02
CRYSTAL-TO-3.3V LVPECL
FREQUENCY SYNTHESIZER
GENERAL DESCRIPTION
The ICS843004-02 is a 4 output LVPECL
ICS
Synthesizer optimized to generate clock
HiPerClockS™ _{frequencies for a variety of high performance}
applications and is a member of the
HiPerClocks^TM family of high performance clock
solutions from ICS. This device can select its input reference
clock from either a crystal input or a single-ended clock signal
and can be configured to generate a number of different output
frequencies via the 3 frequency select pins (F_SEL2:0). The
ICS843004-02 uses ICS’ 3rd generation low phase noise VCO
technology and can achieve 1ps or lower typical rms phase
jitter. This ensures that it will easily meet clocking requirements
for high-speed communication protocols such as 10 and 12
Gigabit Ethernet, 10 Gigbit Fibre Channel, and SONET. This
device is also suitable for next generation serial I/O
technologies like serial ATA and SCSI and is conveniently
packaged in a small 24-pin TSSOP package.
FUNCTION TABLE
F_SEL2
0
0
0
0
1
1
1
1
Inputs
F_SEL1
0
0
1
1
0
0
1
1
F_SEL0
0
1
0
1
0
1
0
1
M Divider
Value
18
24
24
32
32
32
32
40
N Divider
Value
3
4
8
1
2
4
8
8
BLOCK DIAGRAM
nPLL_SEL ^Pulldown
XTAL_IN
XTAL_OUT
OSC
0
TEST_CLK ^Pulldown
1
Phase
Detector
VCO
FEATURES
• Four 3.3V LVPECL outputs
• Selectable crystal oscillator interface
or LVCMOS/LVTTL single-ended input
• Crystal input range: 14MHz - 37.78MHz
• VCO Range: 560MHz - 680MHz
• Supports the following applications:
SONET, Ethernet, Serial ATA, SCSI and HDTV
• RMS phase jitter @ 155.52MHz (12kHz - 20MHz):
0.91ps (typical)
Offset
Noise Power
100Hz ............... -97.1 dBc/Hz
1kHz .............. -121.6 dBc/Hz
10kHz .............. -124.9 dBc/Hz
100kHz .............. -125.1 dBc/Hz
• Full 3.3V supply mode
• 0°C to 70°C ambient operating temperature
PIN ASSIGNMENT
nQ1 1
Q1 2
VCCo 3
Q0 4
24 nQ2
23 Q2
22 VCCO
21 Q3
nQ0 5
MR 6
nPLL_SEL 7
nc 8
nc 9
VCCA 1 0
F_SEL0 11
VCC ¹²
20 nQ3
19 F_SEL2
18 nXTAL_SEL
17 TEST_CLK
16 VEE
15 XTAL_IN
14 XTAL_OUT
13 F_SEL1
ICS843004-02
24-Lead TSSOP
4.40mm x 7.8mm x 0.92mm
N
÷1
÷2
0
÷3
÷4 (default)
package body
Q0 _{G Package}
nQ0
Top View
Q1
÷8
nQ1
1
nXTAL_SEL ^Pulldown
MR ^Pulldown
3
F_SEL0:2
M
÷18
÷24
÷32 (default)
÷40
Q2
nQ2
Q3
nQ3
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.
843004AG-02
www.icst.com/products/hiperclocks.html
REV. A JULY 20, 2005
1