
84320AY-01
www.idt.com
REV. D JULY 26, 2010
1
ICS84320-01
780MHZ, CRYSTAL-TO-3.3V DIFFERENTIAL
LVPECL FREQUENCY SYNTHESIZER
GENERAL DESCRIPTION
The ICS84320-01 is a general purpose, dual output Crystal-
to-3.3V Differential LVPECL High Frequency Synthesizer. The
ICS84320-01 has a selectable TEST_CLK or crystal
inputs. The VCO operates at a frequency range of 620MHz to
780MHz. The VCO frequencyis programmed in steps equal
to the value of the input reference or crystal frequency. The
VCO and output frequencycan be programmed using the
serial or parallel interfaces tothe configuration logic. The low
phase noise characteristicsof the ICS84320-01 make it an
ideal clock source for 10 Gigabit Ethernet, SONET, and
Serial Attached SCSI applications.
BLOCK DIAGRAM
PIN ASSIGNMENT
FEATURES
Dual differential 3.3V LVPECL outputs
Selectable crystal oscillator interface
or LVCMOS/LVTTL TEST_CLK
Output frequency range: 77.5MHz to 780MHz
Crystal input frequency range: 14MHz to 40MHz
VCO range: 620MHz to 780MHz
Parallel or serial interface for programming counter
and output dividers
Duty cycle: 49% - 51% (N > 1)
RMS period jitter: 2ps (typical)
RMS phase jitter at 155.52MHz, using a 38.88MHz crystal
(12kHz to 20MHz): 2.5ps (typical)
Offset
Noise Power
100Hz ................. -90.5 dBc/Hz
1kHz ............... -114.2 dBc/Hz
10kHz ............... -123.6 dBc/Hz
100kHz ............... -128.1 dBc/Hz
3.3V supply voltage
0°C to 70°C ambient operating temperature
Available in both standard (RoHS 5) and lead-free RoHS (6)
packages
32 31 30 29 28 27 26 25
9
10 11 12 13 14 15 16
1
2
3
4
5
6
7
8
24
23
22
21
20
19
18
17
XTAL2
TEST_CLK
XTAL_SEL
VCCA
S_LOAD
S_DATA
S_CLOCK
MR
M5
M6
M7
M8
N0
N1
nc
VEE
V
EE
nFOUT0
FOUT0
V
CCO
nFOUT1
FOUT1
V
CC
TEST
XTAL1
nP_LOAD
VCO_SEL
M0
M1
M2
M3
M4
32-Lead LQFP
7mm x 7mm x 1.4mm package body
Y Package
Top View
ICS84320-01
OSC
VCO_SEL
XTAL_SEL
TEST_CLK
XTAL1
XTAL2
S_LOAD
S_DATA
S_CLOCK
nP_LOAD
M0:M8
N0:N1
VCO
PLL
FOUT0
nFOUT0
FOUT1
nFOUT1
TEST
CONFIGURATION
INTERFACE
LOGIC
÷ M
0
1
0
1
PHASE DETECTOR
÷ 1
÷ 2
÷ 4
÷ 8
MR
÷ N
32-Lead VFQFN
5mm x 5mm x 0.925 package body
K Package
Top View