ICS0004AI01L Datasheet

  • ICS0004AI01L

  • FEMTOCLOCKS⑩ CRYSTAL-TOLVCMOS/LVTTL FREQUENCY SYNTHESIZER

  • 320.63KB

  • 16页

  • IDT

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ICS840004I-01
F
EMTO
C
LOCKS
鈩?C
RYSTAL
-
TO
-
LVCMOS/LVTTL F
REQUENCY
S
YNTHESIZER
G
ENERAL
D
ESCRIPTION
The ICS840004I-01 is a 4 output LVCMOS/LVTTL
IC
S
Synthesizer optimized to generate Ethernet
HiPerClockS鈩?/div>
reference clock frequencies and is a member of
the HiPerClocks
TM
family of high performance
clock solutions from IDT. 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 ICS840004I-01 uses
IDT鈥檚 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 ICS840004I-01 is
packaged in a small 20-pin TSSOP package.
F
EATURES
鈥?Four LVCMOS/LVTTL outputs,
17惟 typical output impedance
鈥?Selectable crystal oscillator interface
or LVCMOS single-ended input
鈥?Supports the following output frequencies: 156.25MHz,
125MHz and 62.5MHz
鈥?VCO range: 560MHz - 700MHz
鈥?RMS phase jitter @ 156.25MHZ (1.875MHz - 20MHz):
0.52ps (typical)
鈥?Output supply modes:
Core/Output
3.3V/3.3V
3.3V/2.5V
2.5V/2.5V
鈥?-40掳C to 85掳C ambient operating temperature
鈥?/div>
Available in both standard (RoHS 5) and lead-free RoHS
(6) packages
F
REQUENCY
S
ELECT
F
UNCTION
T
ABLE
F_SEL1 F_SEL0
0
0
1
1
0
1
0
1
Inputs
M Divider N Divider
Value
Value
25
4
25
25
25
5
10
5
M/N
Ratio Value
6.25
5
2.5
5
Output Frequency (MHz)
(25MHz Ref.)
156.25
125
62.5
125 (default)
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
nc
nXTAL_SEL
REF_CLK
OE
MR
nPLL_SEL
V
DDA
nc
V
DD
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
F_SEL1
GND
Q0
Q1
V
DDO
Q2
Q3
GND
XTAL_IN
XTAL_OUT
OSC
XTAL_OUT
REF_CLK Pulldown
0
F_SEL1:0
1
Phase
Detector
00
01
10
11
Q0
1
VCO
0
N
梅4
梅5
梅10
梅5
(default)
Q1
ICS840004I-01
20-Lead TSSOP
6.5mm x 4.4mm x 0.92mm
package body
Q2
M = 梅25 (fixed)
Q3
G Package
Top View
MR
840004AGI-01
Pulldown
1
REV. A OCTOBER 22, 2007

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