ICS8442I Datasheet, PDF (1/15 Pages) Integrated Circuit Systems – 700MHZ, CRYSTAL OSCILLATOR-TO-DIFFERENTIAL LVDS FREQUENCY SYNTHESIZER

Integrated
Circuit
Systems, Inc.
ICS8442I
700MHZ, CRYSTAL OSCILLATOR-TO-DIFFERENTIAL
LVDS FREQUENCY SYNTHESIZER
GENERAL DESCRIPTION
FEATURES
ICS
HiPerClockS™
The ICS8442I is a general purpose, dual output
Crystal-to-Differential LVDS High Frequency
Synthesizer and a member of the HiPerClockS™
family of High Performance Clock Solutions from
• Dual differential LVDS outputs
• Selectable crystal oscillator interface or
LVCMOS/LVTTL TEST_CLK
ICS. The ICS8442I has a selectable TEST_CLK • Output frequency range: 31.25MHz to 700MHz
or crystal input. The TEST_CLK input accepts LVCMOS or
LVTTL input levels and translates them to LVDS levels. The ^{• Crystal input frequency range: 10MHz to 25MHz}
VCO operates at a frequency range of 250MHz to 700MHz. • VCO range: 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 ^{• Parallel or serial interface for programming counter}
frequency can be programmed using the serial or parallel
and output dividers
interface to the configuration logic. The low phase noise _{• RMS period jitter: 3.5ps (typical)}
characteristics of the ICS8442I makes it an ideal clock source
for Gigabit Ethernet and Sonet applications.
• Cycle-to-cycle jitter: 18ps (typical)
• 3.3V supply voltage
• -40°C to 85°C ambient operating temperature
BLOCK DIAGRAM
VCO_SEL
XTAL_SEL
TEST_CLK
XTAL_IN
XTAL_OUT
0
OSC ¹
MR
S_LOAD
S_DATA
S_CLOCK
nP_LOAD
M0:M8
N0:N1
PLL
PHASE DETECTOR
÷1
VCO
÷2
0
÷4
÷M
1
÷8
CONFIGURATION
INTERFACE
LOGIC
PIN ASSIGNMENT
FOUT0
nFOUT0
FOUT1
nFOUT1
M5
M6
M7
M8
N0
N1
nc
GND
32 31 30 29 28 27 26 25
1
24
2
23
3
22
4
ICS8442I ²¹
5
20
6
19
7
18
8
17
9 10 11 12 13 14 15 16
XTAL_OUT
TEST_CLK
XTAL_SEL
VDDA
S_LOAD
S_DATA
S_CLOCK
MR
TEST
32-Lead LQFP
7mm x 7mm x 1.4mm package body
Y Package
Top View
8442AYI
www.icst.com/products/hiperclocks.html
1
REV. C MAY 10, 2005