ICS843204I Datasheet, PDF (1/12 Pages) Integrated Circuit Systems – FEMTOCLOCKS™ CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER

Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS843204I
FEMTOCLOCKS™ CRYSTAL-TO-
3.3V LVPECL FREQUENCY SYNTHESIZER
GENERAL DESCRIPTION
The ICS843204I is a 4 output LVPECL
ICS
Synthesizer optimized to generate Gigabit
HiPerClockS™ _{Ethernet and SONET reference clock fre-}
quencies and is a member of the HiPerClocks^TM
family of high performance clock solutions from
ICS. Using a 19.44MHz and 25MHz, 18pF parallel resonant
crystal, 155.52MHz and 156.25MHz frequencies can be
generated. The ICS843204I uses ICS’ FemtoClock^TM low
phase noise VCO technology and can achieve 1ps or lower
typical RMS phase jitter. The ICS843204I is packaged in a
48-pin TSSOP package.
FEATURES
• Four 3.3V LVPECL outputs
• Selectable crystal oscillator interface
or LVCMOS/LVTTL single-ended input
• Supports the following output frequencies: 155.52MHz
and 156.25MHz
• VCO range: 560MHz - 680MHz
• RMS phase jitter @ 155.52MHz, using a 19.44MHz crystal
(12kHz - 13MHz): 0.86ps (typical)
• RMS phase jitter @ 156.25MHz, using a 19.44MHz crystal
(1.875MHz - 20MHz): 0.52ps (typical)
• Full 3.3V supply mode
• -40°C to 85°C ambient operating temperature
• Available in both standard and lead-free RoHS
compliant packages
BLOCK DIAGRAM
PLL_BYPASS_A
IN_SELA
CLK0
XTAL_IN0 ^25MHz
XTAL_OUT0
OSC
PLL_BYPASS_B
IN_SELB
CLK1
19.44MHz
XTAL_IN1
XTAL_OUT1
OSC
PLL
÷4
156.25MHz
625MHz
PLL
÷4
155.52MHz
622.08MHz
PIN ASSIGNMENT
SELA0
0
1
SELA1
0
1
SELB0
0
1
SELB1
0
1
OEA0
QA0
nQA0
OEA1
QA1
nQA1
OEB0
QB0
nQB0
OEB1
QB1
nQB1
nQA1 1
QA1 2
nQA0 3
QA0 4
nc 5
VCCO_A 6
SELA1 7
SELA0 8
PLL_BYPASS_A 9
nc 10
nc 11
nc 12
nc 13
XTAL_IN1 14
XTAL_OUT1 15
CLK1 16
IN_SEL_B 17
PLL_BYPASS_B 18
VCCO_B 19
nc 20
QB0 21
nQB0 22
QB1 23
nQB1 24
48 IN_SEL_A
47 CLK0
46 XTAL_IN0
45 XTAL_OUT0
44 nc
43 VEE
42 OEA0
41 OEA1
40 VCC
39 VCCA
38 nc
37 nc
36 SELB0
35 VEE
34 OEB0
33 OEB1
32 VCC
31 SELB1
30 VCCA
29 nc
28 nc
27 nc
26 nc
25 nc
ICS843204I
48 Lead TSSOP
6.1mm x 12.5mm x 0.93mm
package body
G 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.
843204AGI
www.icst.com/products/hiperclocks.html
REV. A JANUARY 6, 2006
1