ICS843020-01 Datasheet, PDF (1/20 Pages) Integrated Circuit Systems – FEMTOCLOCKS-TM 680MHZ, CRYSTAL-TO- 3.3V DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER

Integrated
Circuit
Systems, Inc.
ICS843020-01
FEMTOCLOCKS™ 680MHZ, CRYSTAL-TO-
3.3V DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER
GENERAL DESCRIPTION
ICS
The ICS843020-01 is a general purpose, dual out-
put Crystal-to-3.3V Differential LVPECL High Fre-
HiPerClockS™ _{quency Synthesizer and a member of the}
FemtoClocks™ family of High Performance Clock
Solutions from ICS. The ICS843020-01 is based
on ICS’ 3^rd generation VCO technology and is capable of sub-
1ps RMS Phase Jitter performance, making it ideal for use in
10 Gigabit Ethernet, 10 Gigabit Fibre Channel, SONET and
Serial ATA applications.
The ICS843020-01 is a highly flexible programmable synthe-
sizer capable of generating output frequencies over a range of
70MHz to 680MHz. The output frequency can be programmed
in small step sizes as low as 250kHz when using a 16MHz
crystal, ÷8 input divider, and output divider = ÷8.
FEATURES
• Dual differential 3.3V LVPECL outputs
• Selectable crystal oscillator interface
or LVCMOS/LVTTL TEST_CLK
• Output frequency range: 70MHz to 680MHz
• Crystal input frequency range: 12MHz to 32MHz
• VCO range: 560MHz to 680MHz
• Parallel or serial interface for programming feedback
and output dividers
• Input P_DIV under parallel load control
• RMS phase jitter at 156.25MHz (1.875MHz to 20MHz):
0.49ps (typical), P_DIV = ÷1
• 3.3V supply voltage
• 0°C to 70°C ambient operating temperature
• Lead-Free package fully RoHS compliant
BLOCK DIAGRAM
VCO_SEL
XTAL_SEL
TEST_CLK
XTAL_IN
XTAL_OUT
P_DIV
OSC
0
1
÷P
0 ÷8
Float ÷1 (default)
1 ÷4
MR
S_LOAD
S_DATA
S_CLOCK
nP_LOAD
M0:M8
N0:N1
PLL
PHASE DETECTOR
÷N
÷1
VCO
0 ^÷2
÷4
÷M
1
÷8
CONFIGURATION
INTERFACE
LOGIC
PIN ASSIGNMENT
FOUT0
nFOUT0
FOUT1
nFOUT1
M5
M6
M7
M8
N0
N1
P_DIV
VEE
32 31 30 29 28 27 26 25
1
24
2
23
3
22
4 _ICS843020-01 21
5
20
6
19
7
18
8
17
9 10 11 12 13 14 15 16
XTAL_OUT
TEST_CLK
XTAL_SEL
VCCA
S_LOAD
S_DATA
S_CLOCK
MR
TEST
32-Lead LQFP
7mm x 7mm x 1.4mm package body
Y Package
Top View
843020AY-01
www.icst.com/products/hiperclocks.html
1
REV. B APRIL 14, 2005