Integrated
Circuit
Systems, Inc.
ICS840002-01
F
EMTO
C
LOCKS
™ C
RYSTAL
-
TO
-
LVCMOS/LVTTL F
REQUENCY
S
YNTHESIZER
F
EATURES
• Two LVCMOS/LVTTL outputs @ 3.3V,
17Ω typical output impedance
• Selectable crystal oscillator interface
or LVCMOS/LVTTL single-ended input
• Output frequency range: 56MHz - 175MHz
• VCO range: 560MHz - 700MHz
• Output skew: 12ps (maximum)
• RMS phase jitter at 156.25MHZ (1.875MHz - 20MHz):
0.47ps (typical)
Phase noise:
Offset
Noise Power
100Hz ............... -97.4 dBc/Hz
1kHz .............. -120.2 dBc/Hz
10kHz .............. -127.6 dBc/Hz
100kHz .............. -126.1 dBc/Hz
• Full 3.3V or 3.3V core/2.5V output supply mode
• -30°C to 85°C ambient operating temperature
• Available in both standard and lead-free RoHS compliant
packages
G
ENERAL
D
ESCRIPTION
The ICS840002-01 is a 2 output LVCMOS/LVTTL
Synthesizer optimized to generate Ethernet
HiPerClockS™
reference clock frequencies and is a member of
the HiPerClocks
TM
family of high performance
clock solutions from ICS. Using a 25MHz 18pF
parallel resonant crystal, the following frequencies can be
generated based on the 2 frequency select pins (F_SEL1:0):
156.25MHz, 125MHz, and 62.5MHz. The ICS840002-01 uses
ICS’ 3
rd
generation low phase noise VCO technology and can
achieve 1ps or lower typical random rms phase jitter, easily
meeting Ethernet jitter requirements. The ICS840002-01 is
packaged in a small 16-pin TSSOP package.
IC
S
F
REQUENCY
S
ELECT
F
UNCTION
T
ABLE
Inputs
F_SEL1 F_SEL0
0
0
1
1
0
1
0
1
M Divider Value
25
25
25
25
Output Frequency
(25MHz Ref.)
N Divider Value
4
5
10
5
156.25
125
62.5
125
B
LOCK
D
IAGRAM
OE
Pullup
F_SEL1:0 Pullup:Pullup
nPLL_SEL Pulldown
nXTAL_SEL
XTAL_IN
Pulldown
25MHz
P
IN
A
SSIGNMENT
2
F_SEL0
nXTAL_SEL
TEST_CLK
OE
MR
nPLL_SEL
V
DDA
V
DD
Q0
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
F_SEL1
GND
GND
Q0
Q1
V
DDO
XTAL_IN
XTAL_OUT
OSC
XTAL_OUT
TEST_CLK Pulldown
0
F_SEL1:0
1
Phase
Detector
00
01
10
11
1
VCO
0
N
÷4
÷5
÷10
÷5
ICS840002-01
Q1
M = ÷25 (fixed)
16-Lead TSSOP
4.4mm x 5.0mm x 0.92mm
package body
G Package
Top View
MR
840002AG-01
Pulldown
www.icst.com/products/hiperclocks.html
REV. B JANUARY 13, 2006
1
ICS [ INTEGRATED CIRCUIT SYSTEMS ]
