ICS8442 Datasheet, PDF (1/15 Pages) Integrated Circuit Systems – 700MHZ, CRYSTAL OSCILLATOR-TO-DIFFERENTIAL LVDS FREQUENCY SYNTHESIZER

Integrated
Circuit
Systems, Inc.
ICS8442
700MHZ, CRYSTAL OSCILLATOR-TO-DIFFERENTIAL
LVDS FREQUENCY SYNTHESIZER
GENERAL DESCRIPTION
ICS
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 inter-
face to the configuration logic.The low phase noise characteris-
tics of the ICS8442 makes it an ideal clock source for Gigabit
Ethernet and Sonet applications.
FEATURES
• Dual differential LVDS outputs
• 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 available
BLOCK DIAGRAM
VCO_SEL
XTAL_SEL
TEST_CLK
XTAL1
XTAL2
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
÷8
1
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
ICS8442
21
5
20
6
19
7
18
8
17
9 10 11 12 13 14 15 16
XTAL1
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
8442AY
www.icst.com/products/hiperclocks.html
1
REV. C JULY 8, 2004