ICS8432I-101
700MHZ,
DIFFERENTIAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER
Integrated
Circuit
Systems, Inc.
GENERAL DESCRIPTION
FEATURES
The ICS8432I-101 is a general purpose, dual out- • Dual differential 3.3V LVPECL outputs
ICS
put Differential-to-3.3V LVPECL high frequency
• Selectable CLK, nCLK or LVCMOS/LVTTLTEST_CLK
HiPerClockS™
synthesizer and a member of the HiPerClockS™
family of High Performance Clock Solutions from
ICS. The ICS8432I-101 has a selectable
• TEST_CLK can accept the following input levels:
LVCMOS or LVTTL
TEST_CLK or CLK, nCLK inputs.TheTEST_CLK input accepts
LVCMOS or LVTTL input levels and translates them to 3.3V
LVPECL levels.The CLK, nCLK pair can accept most standard
differential input levels.TheVCO operates at a frequency range
of 250MHz to 700MHz.The VCO frequency is programmed in
steps equal to the value of the input differential or single ended
reference frequency. The VCO and output frequency can be
programmed using the serial or parallel interfaces to the
configuration logic.The low phase noise characteristics of the
ICS8432I-101 makes it an ideal clock source for Gigabit
Ethernet and SONET applications.
• CLK, nCLK pair can accept the following differential
input levels: LVPECL, LVDS, LVHSTL, SSTL, HCSL
• CLK, nCLK orTEST_CLK maximum input frequency: 40MHz
• Output frequency range: 25MHz to 700MHz
• VCO range: 250MHz to 700MHz
• Accepts any single-ended input signal on CLK input
with resistor bias on nCLK input
• Parallel interface for programming counter
and output dividers
• RMS period jitter: 5ps (maximum)
• Cycle-to-cycle jitter: 25ps (maximum)
• 3.3V supply voltage
• -40°C to 85°C ambient operating temperature
• Lead-Free package fully RoHS compliant
BLOCK DIAGRAM
PIN ASSIGNMENT
VCO_SEL
CLK_SEL
TEST_CLK
0
32 31 30 29 28 27 26 25
CLK
nCLK
1
M5
M6
M7
M8
N0
N1
nc
1
2
3
4
5
6
7
8
24
23
22
21
20
19
18
17
CLK
TEST_CLK
CLK_SEL
VCCA
ICS8432I-101
S_LOAD
S_DATA
S_CLOCK
MR
PLL
PHASE DETECTOR
MR
0
VEE
÷1
÷2
÷4
÷8
VCO
FOUT0
nFOUT0
FOUT1
nFOUT1
9
10 11 12 13 14 15 16
÷ M
1
S_LOAD
S_DATA
S_CLOCK
nP_LOAD
CONFIGURATION
INTERFACE
LOGIC
TEST
32-Lead LQFP
7mm x 7mm x 1.4mm package body
M0:M8
N0:N1
Y Package
TopView
8432DYI-101
www.icst.com/products/hiperclocks.html
REV. A MAY 23, 2005
1