ICS844001-21 Datasheet, PDF (1/17 Pages) Integrated Device Technology – FEMTOCLOCKS™ CRYSTAL-TO-LVDS FREQUENCY SYNTHESIZER

PRELIMINARY
FEMTOCLOCKS™ CRYSTAL-TO-LVDS
FREQUENCY SYNTHESIZER
GENERAL DESCRIPTION
The ICS844001-21 is a a highly versatile, low
ICS
phase noise LVDS Synthesizer which can generate
HiPerClockS™ _{l o w j i t t e r r e fe r e n c e c l o ck s fo r a va r i e t y o f}
communications applications and is a member of
the HiPerClocks^TM family of high performance clock
solutions from IDT. 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 ICS844001-21 is
packaged in a small 24-pin TSSOP package.
ICS844001-21
FEATURES
• One differential LVDS output pair and
one LVCMOS reference 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):
0.92ps (typical)
• Full 3.3V supply mode
• 0°C to 70°C ambient operating temperature
• Available in both standard (RoHS 5) and lead-free (RoHS 6)
packages
BLOCK DIAGRAM
3
N2:N0
SEL0 ^Pulldown
SEL1 ^Pulldown
XTAL_IN0
XTAL_OUT0
OSC 0 0
XTAL_IN1
XTAL_OUT1
OSC
01
REF_CLK ^Pulldown
10
11
MR ^Pulldown
3
M2:M0
REF_OE ^Pulldown
11
Phase
Detector
10
VCO
01
00
M
000 ÷18
001 ÷22
010 ÷24
011 ÷25
100 ÷32 (default)
101 ÷40
110 ÷40
111 ÷40
N
000 ÷1
001 ÷2
010 ÷3
011 ÷4 (default)
100 ÷5
101 ÷6
110 ÷8
111 ÷10
PIN ASSIGNMENT
VDDO_CMOS 1
N0 2
N1 3
N2 4
VDDO_LVDS 5
Q0 6
Q
nQ0 7
nQ
GND 8
VDDA 9
VDD 10
XTAL_OUT1 11
XTAL_IN1 ¹²
24 REF_OUT
23 GND
22 REF_OE
21 M2
20 M1
19 M0
18 MR
17 SEL1
16 ^SEL0
15 REF_CLK
14 XTAL_IN0
13 XTAL_OUT0
ICS844001-21
24-Lead TSSOP
4.40mm x 7.8mm x 0.92mm
package body
G Package
Top View
REF_OUT
The Preliminary Information presented herein represents a product in pre-production. The noted characteristics are based on initial product characterization
and/or qualification. Integrated Device Technology, Incorporated (IDT) reserves the right to change any circuitry or specifications without notice.
IDT^™ / ICS^™ INSERT PRODUCT NAME
1
ICS844001AG-21 REV. A SEPTEMBER 14, 2007