ICS84321I
260MHZ, CRYSTAL-TO-3.3V DIFFERENTIAL
LVPECL FREQUENCY SYNTHESIZER
Integrated
Circuit
Systems, Inc.
GENERAL DESCRIPTION
FEATURES
The ICS84321I is a general purpose, dual output • Dual differential 3.3V LVPECL outputs
ICS
Crystal-to-3.3V Differential LVPECL High Fre-
quency Synthesizer and a member of the
HiPerClockS™ family of High Performance Clock
Solutions from ICS. The ICS84321I has a select-
• Selectable crystal oscillator interface
or LVCMOS/LVTTLTEST_CLK
HiPerClockS™
• Output frequency range: 103.3MHz to 260MHz
• Crystal input frequency range: 14MHz to 40MHz
• VCO range: 620MHz to 780MHz
able TEST_CLK or crystal inputs. The VCO operates at a fre-
quency range of 620MHz to 780MHz. 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 interfaces to the con-
figuration logic. The low phase noise characteristics of the
ICS84321I make it an ideal clock source for Fibre Channel 1,
Fibre Channel 2, 10 Gigabit Fibre Channel, Gigabit Ethernet
and 10 Gigabit Ethernet applications.
• Parallel or serial interface for programming counter
and output dividers
• RMS period jitter: 3ps (typical)
• RMS phase jitter at 155.52MHz, using a 38.88MHz crystal
(12KHz to 20MHz): 2.5ps (typical)
Phase noise: 155.52MHz
Offset
Noise Power
100Hz ..................-84.1 dBc/Hz
1KHz ................ -109.8 dBc/Hz
10KHz ................ -126.3 dBc/Hz
100KHz ................ -128.7 dBc/Hz
• 3.3V supply voltage
• -40°C to 85°C ambient operating temperature
BLOCK DIAGRAM
VCO_SEL
PIN ASSIGNMENT
XTAL_SEL
TEST_CLK
0
32 31 30 29 28 27 26 25
XTAL1
1
M5
M6
M7
M8
N0
N1
nc
OSC
1
2
3
4
5
6
7
8
24
23
22
21
20
19
18
17
XTAL2
XTAL2
TEST_CLK
XTAL_SEL
VCCA
ICS84321I
10 11 12 13 14 15 16
32-Lead LQFP
S_LOAD
S_DATA
S_CLOCK
MR
PLL
PHASE DETECTOR
÷ 3
MR
÷ 4
÷ 5
÷ 6
0
VEE
VCO
FOUT0
nFOUT0
FOUT1
nFOUT1
9
÷ M
1
S_LOAD
S_DATA
S_CLOCK
nP_LOAD
CONFIGURATION
INTERFACE
LOGIC
TEST
7mm x 7mm x 1.4mm package body
Y Package
TopView
M0:M8
N0:N1
84321AYI
www.icst.com/products/hiperclocks.html
REV. A OCTOBER 10, 2003
1