ICS84321I Datasheet, PDF (1/16 Pages) Integrated Circuit Systems – 260MHZ, CRYSTAL-TO-3.3V DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER

Integrated
Circuit
Systems, Inc.
ICS84321I
260MHZ, CRYSTAL-TO-3.3V DIFFERENTIAL
LVPECL FREQUENCY SYNTHESIZER
GENERAL DESCRIPTION
ICS
The ICS84321I is a general purpose, dual output
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 ICS84321I has a select-
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.
FEATURES
• Dual differential 3.3V LVPECL outputs
• Selectable crystal oscillator interface
or LVCMOS/LVTTL TEST_CLK
• Output frequency range: 103.3MHz to 260MHz
• Crystal input frequency range: 14MHz to 40MHz
• VCO range: 620MHz to 780MHz
• 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
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
÷3
VCO
0 ^÷4
÷5
÷M
1
÷6
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
ICS84321I
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
84321AYI
www.icst.com/products/hiperclocks.html
1
REV. A OCTOBER 10, 2003