ICS8432I-51 Datasheet, PDF (1/16 Pages) Integrated Circuit Systems – 700MHZ, CRYSTAL-TO-3.3V DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER

Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS8432I-51
700MHZ, CRYSTAL-TO-3.3V DIFFERENTIAL
LVPECL FREQUENCY SYNTHESIZER
GENERAL DESCRIPTION
The ICS8432I-51 is a general purpose, dual output
,&6
Crystal-to-3.3V Differential LVPECL High Fre-
HiPerClockS™ _{quency Synthesizer and a member of the}
HiPerClockS™ family of High Performance Clock
Solutions from ICS. The ICS8432I-51 has a select-
able TEST_CLK or crystal input. 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 refer-
ence 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 ICS8432I-51 make it an ideal clock source for Gigabit
Ethernet, Fibre Channel 1 and 2, and Infiniband applications.
FEATURES
• Dual differential 3.3V LVPECL outputs
• Selectable crystal oscillator interface or
LVCMOS/LVTTL TEST_CLK
• Output frequency range: 31.25MHz to 700MHz
• Crystal input frequency range: 12MHz to 25MHz
• VCO range: 250MHz to 700MHz
• Parallel or serial interface for programming counter
and output dividers
• RMS period jitter: 3.5ps (maximum)
• Cycle-to-cycle jitter: 25ps (maximum)
• 3.3V supply voltage
• -40°C to 85°C ambient operating temperature
• Replaces the ICS8432I-01
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
VCO
0
÷1
÷2
÷M
÷4
1
÷8
CONFIGURATION
INTERFACE
LOGIC
PIN ASSIGNMENT
FOUT0
nFOUT0
FOUT1
nFOUT1
TEST
32 31 30 29 28 27 26 25
M5 1
M6 2
M7 3
M8 4
N0 5
N1 6
nc 7
ICS8432I-51
24 XTAL2
23 TEST_CLK
22 XTAL_SEL
2 1 VCCA
20 S_LOAD
19 S_DATA
18 S_CLOCK
VEE 8
17 MR
9 10 11 12 13 14 15 16
32-Lead LQFP
7mm x 7mm x 1.4mm package body
Y Package
Top View
The Preliminary Information presented herein represents a product in prototyping or pre-production. The noted characteristics are based on initial
product characterization. Integrated Circuit Systems, Incorporated (ICS) reserves the right to change any circuitry or specifications without notice.
8432BYI-51
www.icst.com/products/hiperclocks.html
REV. A MAY 28, 2003
1