ICS84324 Datasheet, PDF (1/14 Pages) Integrated Circuit Systems – CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER WITH FANOUT BUFFER

Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS84324
CRYSTAL-TO-3.3V LVPECL
FREQUENCY SYNTHESIZER WITH FANOUT BUFFER
GENERAL DESCRIPTION
The ICS84324 is a Crystal-to-3.3V LVPECL Fre-
,&6
quency Synthesizer with Fanout Buffer and a mem-
HiPerClockS™ _{ber of the HiPerClockS™ family of High Performance}
Clock Solutions from ICS. Output frequency can be
programmed using frequency select pins. The low
phase noise characteristics of the ICS84324 make it an ideal clock
source for Fibre Channel 1 and Gigabit Ethernet applications.
FUNCTION TABLE
Inputs
XTAL Output Frequency
MR F_SEL1 F_SEL0
F_OUT
1
X
X
LOW
0
0
0
25.5MHz
53.125MHz
0
0
1 25.5MHz
106.25MHz
0
1
0
25MHz
62.5MHz
0
1
1
25MHz
125MHz
FEATURES
• 6 differential 3.3V LVPECL outputs
• Crystal oscillator interface
• Output frequency range: 53.125MHz to 125MHz
• Crystal input frequency: 25MHz and 25.5MHz
• RMS phase jitter at 106.25MHz, using a 25.5MHz crystal
(637KHz to 10Mhz): 2.69ps
• Phase noise:
Offset
Noise Power
100Hz ................. -96 dBc/Hz
1KHz ................. -115 dBc/Hz
10KHz ................. -125 dBc/Hz
100KHz ................. -127 dBc/Hz
• 3.3V supply voltage
• 0°C to 70°C ambient operating temperature
• Industrial termperature information available upon request
BLOCK DIAGRAM
PIN ASSIGNMENT
XTAL1
XTAL2
OSC
PLL
Feedback
Divider
F_SEL1 MR
0
Output
/^{6 Q0:Q5}
1
Divider
/^{6 nQ0:nQ5}
Q0 1
nQ0 2
Q1 3
nQ1 4
Q2 5
nQ2 6
Q3 7
nQ3 8
Q4 9
nQ4 10
Q5 11
nQ5 12
2 4 VCCO
23 F_SEL0
22 F_SEL1
21 MR
20 XTAL1
19 XTAL2
1 8 VEE
1 7 VCCA
16 VCC
15 PLL_SEL
1 4 VEE
1 3 VCCO
PLL_SEL
F_SEL0
ICS84324
24-Lead, 300-MIL SOIC
7.5mm x 15.33mm x 2.3mm body package
M 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.
84324EM
www.icst.com/products/hiperclocks.html
REV. A SEPTEMBER 18, 2003
1