PRELIMINARY
Integrated
Circuit
Systems, Inc.
ICS840001-31
F
EMTO
C
LOCKS
™ C
RYSTAL
-
TO
-
LVCMOS/LVTTL F
REQUENCY
S
YNTHESIZER
F
EATURES
•
(2) LVCMOS/LVTTL outputs, 20Ω typical output impedence
(1) Main clock output (Q)
(1) Three-state reference clock output (REF_CLK)
•
Crystal oscillator interface can accept 26.5625MHz or
40MHz 18pF parallel resonant crystals
•
Output frequency range: 106.25MHz or 100MHz
•
VCO range: 490MHz to 640MHz
•
RMS phase jitter @ 106.25MHz, using a 26.5625MHz crystal
(637kHz - 10MHz): 0.38ps (typical)
•
3.3V operating supply
•
0°C to 70°C ambient operating temperature
G
ENERAL
D
ESCRIPTION
The ICS840001-31 is a two output LVCMOS/
LVTTL Synthesizer and a member of the
HiPerClockS™
HiPerClocks
TM
family of high perfor mance
devices from ICS. One output is the LVCMOS/
LVTTL main synthesized clock output (Q) and one
output is a three-state LVCMOS/LVTTL reference clock
(REF_CLK) output at the frequency of the crystal oscillator.
The device can accept 26.5625MHz and 40MHz crystals and
can synthesize 106.25MHz or 100MHz outputs. The
ICS840001-31 has excellent <1ps phase jitter performance
over the 637kHz – 10MHz integration range. The ICS840001-
31 is packaged in a 3mm x 3mm 16-pin VFQFN, making it
ideal for use on space constrained boards.
ICS
F
UNCTION
T
ABLE
Inputs
Crystal
26.5625
40
M
0
1 (or Floating)
OE
0
1 (or Floating)
VCO
(MHz)
637.5
600
Outputs
Q
Frequency (MHz)
106.25
10 0
Application
REF_CLK
Frequency (MHz)
Fibre Channel
High-Z
40
Serial Attached (SCSI)
B
LOCK
D
IAGRAM
OE (Pullup)
P
IN
A
SSIGNMENT
REF_CLK
V
DDA
nc
OE 1
XTAL_IN 2
XTAL_IN
16 15 14 13
12
11
10
9
5
nc
nc
REF_CLK
Q
V
DDO
GND
V
DD
OSC
XTAL_OUT
Phase
Detector
VCO
490MHz - 640MHz
÷6
Q
XTAL_OUT 3
M 4
6
nc
7
nc
8
NC
1 = ÷15
(default)
0 = ÷24
ICS840001-31
16-Lead VFQFN
3mm x 3mm x 0.95 package body
K Package
Top View
M
(Pullup)
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.
840001AK-31
www.icst.com/products/hiperclocks.html
REV. A MAY 4, 2005
1
ICS [ INTEGRATED CIRCUIT SYSTEMS ]
