ICS843001-21 Datasheet, PDF (1/15 Pages) Integrated Circuit Systems – FEMTOCLOCKS™ CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER

Integrated
Circuit
Systems, Inc.
ICS843001-21
FEMTOCLOCKS™ CRYSTAL-TO-3.3V LVPECL
FREQUENCY SYNTHESIZER
GENERAL DESCRIPTION
The ICS843001-21 is a a highly versatile, low
ICS
phase noise LVPECL Synthesizer which can
HiPerClockS™ generate low jitter reference clocks for a variety
of communications applications and is a
member of the HiPerClocks^TM family of high
performance clock solutions from ICS. The dual
crystal interface allows the synthesizer to support up to
two communications standards in a given application (i.e.
1GB Ethernet with a 25MHz crystal and 1Gb Fibre Channel
using a 25.5625MHz crystal). The rms phase jitter
performance is typically less than 1ps, thus making the
device acceptable for use in demanding applications such
as OC48 SONET and 10Gb Ethernet. The ICS843001-21
is packaged in a small 24-pin TSSOP package.
FEATURES
• One 3.3V LVPECL output pair and one LVCMOS output
• Selectable crystal oscillator interface
or LVCMOS/LVTTL single-ended input
• VCO range: 560MHz - 700MHz
• Supports the following applications:
SONET, Ethernet, Fibre Channel, Serial ATA, and HDTV
• RMS phase jitter @ 622.08MHz (12kHz - 20MHz):
0.80ps (typical)
Offset
Noise Power
100Hz ............... -60.3 dBc/Hz
1kHz ............... -88.5 dBc/Hz
10kHz ............. -111.9 dBc/Hz
100kHz ............. -113.0 dBc/Hz
• Full 3.3V supply mode
• 0°C to 70°C ambient operating temperature
• Available in both standard and lead-free RoHS-compliant
packages
BLOCK DIAGRAM
3
N2:N0
SEL0 ^Pulldown
SEL1 ^Pulldown
XTAL_IN0
XTAL_OUT0
OSC
00
XTAL_IN1
XTAL_OUT1
OSC
01
TEST_CLK ^Pulldown
10
MR ^Pulldown
3
M2:M0
OE_REF ^Pulldown
843001AG-21
11
Phase
Detector
10
VCO
01
00
M
000 ÷18
001 ÷22
010 ÷24
011 ÷25
100 ÷32 (default)
101 ÷40
N
000 ÷1
001 ÷2
010 ÷3
011 ÷4 (default)
100 ÷5
101 ÷6
110 ÷8
111 ÷10
PIN ASSIGNMENT
VCCO_CMOS 1
N0 2
N1 3
N2 4
VCCO_PECL 5
Q0 6
nQ0 7
VEE 8
VCCA 9
VCC 10
XTAL_OUT1 11
XTAL_IN1 ¹²
24 REF_CLK
23 VEE
22 REF_OE
21 M2
20 M1
19 M0
18 MR
17 SEL1
16 ^SEL0
15 TEST_CLK
14 XTAL_IN0
13 XTAL_OUT0
ICS843001-21
24-Lead TSSOP
4.40mm x 7.8mm x 0.92mm
package body
G Package
Top View
Q0
nQ0
www.icst.com/products/hiperclocks.html
1
REF_CLK
REV. A OCTOBER 26, 2005