ICS8432-101_07 Datasheet, PDF (1/20 Pages) Integrated Device Technology – 700MHZ, DIFFERENTIAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER

700MHZ, DIFFERENTIAL-TO-3.3V
LVPECL FREQUENCY SYNTHESIZER
GENERAL DESCRIPTION
The ICS8432-101 is a general purpose, dual out-
ICS
put Differential-to-3.3V LVPECL high frequency
HiPerClockS™ _{synthesizer and a member of the HiPerClockS™}
family of High Performance Clock Solutions from
ICS. The ICS8432-101 has a selectable TEST_CLK
or CLK, nCLK inputs. The TEST_CLK input accepts LVCMOS
or LVTTL input levels and translates them to 3.3V LVPECL lev-
els. The CLK, nCLK pair can accept most standard differen-
tial input 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 differential or single ended
reference frequency. The VCO and output frequency can be
programmed using the serial or parallel interfaces to the con-
figuration logic. The low phase noise characteristics of the
ICS8432-101 makes it an ideal clock source for Gigabit Ethernet
and SONET applications.
ICS8432-101
FEATURES
• Dual differential 3.3V LVPECL outputs
• Selectable CLK, nCLK or LVCMOS/LVTTL TEST_CLK
• TEST_CLK can accept the following input levels:
LVCMOS or LVTTL
• CLK, nCLK pair can accept the following differential
input levels: LVPECL, LVDS, LVHSTL, SSTL, HCSL
• CLK, nCLK or TEST_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
• 0°C to 70°C ambient operating temperature
• Available in both standard (RoHS 5) and lead-free (RoHS 6)
packages
BLOCK DIAGRAM
PIN ASSIGNMENT
VCO_SEL
CLK_SEL
TEST_CLK
0
CLK
1
nCLK
MR
S_LOAD
S_DATA
S_CLOCK
nP_LOAD
M0:M8
N0:N1
PLL
PHASE DETECTOR
VCO
0
÷1
÷2
÷M
1
÷4
÷8
CONFIGURATION
INTERFACE
LOGIC
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
VEE 8
ICS8432-101
24 CLK
23 TEST_CLK
22 CLK_SEL
21 VCCA
20 S_LOAD
19 S_DATA
18 S_CLOCK
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
IDT^™ / ICS^™ 700MHZ, 3.3V LVPECL FREQUENCY SYNTHESIZER
1
ICS8432DY-101 REV. C APRIL 10, 2007