DATA SHEET
ICS8442
Integrated
ICS8442
700MHZ, CRYSTAL OSCILLATOR-TO-DIFFERENTIAL
Circuit
700MHZ, CRYSTAL OSCILLATOR-TO-DIFFERENTIAL
Systems, SYNTHESIZER
LVDS FREQUENCY Inc.
LVDS FREQUENCY SYNTHESIZER
GENERAL DESCRIPTION
FEATURES
The ICS8442 is a general purpose, dual output
Crystal-to-Differential LVDS High Frequency
HiPerClockS™
Synthesizer and a member of the HiPerClockS™
family of High Performance Clock Solutions from
ICS. The ICS8442 has a selectable TEST_CLK
or crystal input. The TEST_CLK input accepts LVCMOS or
LVTTL input levels and translates them to LVDS levels. The
VCO operates at a frequency range of 250MHz to 700MHz.
The VCO frequency is programmed in steps equal to the value
of the input reference or crystal frequency. The VCO and output
frequency can be programmed using the serial or parallel
interface to the configuration logic. The low phase noise
characteristics of the ICS8442 makes it an ideal clock source
for Gigabit Ethernet and Sonet applications.
• Dual differential LVDS outputs
ICS
• Selectable crystal oscillator interface or
LVCMOS/LVTTL TEST_CLK
• Output frequency range: 31.25MHz to 700MHz
• Crystal input frequency range: 10MHz to 25MHz
• VCO range: 250MHz to 700MHz
• Parallel or serial interface for programming counter
and output dividers
• RMS period jitter: 2.7ps (typical)
• Cycle-to-cycle jitter: 18ps (typical)
• 3.3V supply voltage
• 0°C to 85°C ambient operating temperature
• Lead-Free package fully RoHS compliant
BLOCK DIAGRAM
PIN ASSIGNMENT
XTAL_IN
nP_LOAD
M0
M1
M2
M3
M4
XTAL_SEL
TEST_CLK
VCO_SEL
VCO_SEL
0
32 31 30 29 28 27 26 25
XTAL_IN
1
M5
VCO
÷M
1
÷4
÷8
S_LOAD
6
19
S_DATA
7
18
S_CLOCK
GND
8
17
MR
9 10 11 12 13 14 15 16
GND
nFOUT0
FOUT0
VDD
nFOUT1
TEST
32-Lead LQFP
7mm x 7mm x 1.4mm package body
Y Package
Top View
M0:M8
N0:N1
8442AY
20
ICS8442
FOUT1
CONFIGURATION
INTERFACE
LOGIC
VDDA
5
VDD
FOUT0
nFOUT0
FOUT1
nFOUT1
21
TEST
S_LOAD
S_DATA
S_CLOCK
nP_LOAD
0
XTAL_SEL
4
nc
÷2
MR
22
N1
÷1
TEST_CLK
3
N0
PHASE DETECTOR
XTAL_OUT
23
M8
PLL
24
2
M7
XTAL_OUT
1
M6
OSC
www.icst.com/products/hiperclocks.html
IDT™ / ICS™ 700MHZ, CRYSTAL OSCILLATOR-TO-DIFFERENTIAL LVDS FREQUENCY SYNTHESIZER
1
1
REV. D MAY 10, 2005
ICS8442
