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參數資料
| 型號： | ICS8431AMI-21T |
| 英文描述： | 350MHZ, LOW JITTER, CRYSTAL OSCILLATOR-TO-3.3V LVPECL FREQUENCY SYNTHESIZER |
| 中文描述： | 350MHz頻段，低抖動，晶體振蕩器到3.3的LVPECL頻率合成器 |
| 文件頁數： | 1/16頁 |
| 文件大小： | 207K |
| 代理商： | ICS8431AMI-21T |
8431AMI-21
www.icst.com/products/hiperclocks.html
REV. A AUGUST 2, 2005
1
Integrated
Circuit
Systems, Inc.
ICS8431I-21
350MH
Z
, L
OW
J
ITTER
, C
RYSTAL
O
SCILLATOR
-
TO
-3.3V LVPECL F
REQUENCY
S
YNTHESIZER
G
ENERAL
D
ESCRIPTION
The ICS8431I-21 is a general purpose clock fre-
quency synthesizer for IA64/32 application and a
member of the HiPerClockS family of High Per-
formance Clock Solutions from ICS. The VCO op-
erates at a frequency range of 250MHz to 700MHz
providing an output frequency range of 62.5MHz to 350MHz.
The output frequency can be programmed using the parallel in-
terface, M0 through M8 to the configuration logic, and the output
divider control pin, DIV_SEL. Spread spectrum clocking is pro-
grammed via the control inputs SSC_CTL0 and SSC_CTL1.
Programmable features of the ICS8431I-21 support four op-
erational modes. The four modes are spread spectrum clock-
ing (SSC), non-spread spectrum clock and two test modes
which are controlled by the SSC_CTL[1:0] pins. Unlike other
synthesizers, the ICS8431I-21 can immediately change
spread-spectrum operation without having to reset the device.
In SSC mode, the output clock is modulated in order to achieve
a reduction in EMI. In one of the PLL bypass test modes, the
PLL is disconnected as the source to the differential output
allowing an external source to be connected to the TEST_I/O
pin. This is useful for in-circuit testing and allows the differen-
tial output to be driven at a lower frequency throughout the
system clock tree. In the other PLL bypass mode, the oscilla-
tor divider is used as the source to both the M and the Fout
divide by 2. This is useful for characterizing the oscillator and
internal dividers.
XTAL_IN
XTAL_OUT
M0:M8
PLL
FOUT
nFOUT
÷
16
TEST_I/O
OSC
VCO
÷
2
÷
4
PHASE
DETECTOR
÷
M
SSC
Control
Logic
Configuration
Logic
nP_LOAD
SSC_CTL0
F
EATURES
Fully integrated PLL
Differential 3.3V LVPECL output
Crystal oscillator interface
Output frequency range: 62.5MHz to 350MHz
Crystal input frequency range: 14MHz to 25MHz
VCO range: 250MHz to 700MHz
Programmable PLL loop divider for generating a variety
of output frequencies
Spread Spectrum Clocking (SSC) fixed at 1/2% modulation
for environments requiring ultra low EMI
PLL bypass modes supporting in-circuit testing and on-chip
functional block characterization
Cycle-to-cycle jitter: 30ps (maximum)
3.3V supply voltage
-40°C to 85°C ambient operating temperature
Replaces ICS8431I-01
Available in both, Standard and RoHS/Lead-Free
compliant packages
B
LOCK
D
IAGRAM
P
IN
A
SSIGNMENT
SSC_CTL1
M0
M1
M2
M3
M4
M5
M6
M7
M8
SSC_CTL0
SSC_CTL1
V
EE
TEST_I/O
V
CC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
nP_LOAD
V
CC
XTAL_IN
XTAL_OUT
nc
nc
V
CCA
V
EE
MR
DIV_SEL
V
CCO
FOUT
nFOUT
V
EE
ICS8431I-21
28-Lead SOIC
7.5mm x 18.05mm x 2.25mm package body
M Package
Top View
DIV_SEL
HiPerClockS
ICS
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PDF描述 |
|---|---|
| ICS8431I-21 | 350MHZ, LOW JITTER, CRYSTAL OSCILLATOR-TO-3.3V LVPECL FREQUENCY SYNTHESIZER |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| ICS8431CM-01 | 制造商:ICS 制造商全稱:ICS 功能描述:200MHZ, LOW JITTER, LVPECL FREQUENCY SYNTHESIZER |
| ICS8431CM-01T | 制造商:ICS 制造商全稱:ICS 功能描述:200MHZ, LOW JITTER, LVPECL FREQUENCY SYNTHESIZER |
| ICS8431CM-11 | 制造商:ICS 制造商全稱:ICS 功能描述:255MHZ, LOW JITTER, LVPECL FREQUENCY SYNTHESIZER |
| ICS8431CM-11T | 制造商:ICS 制造商全稱:ICS 功能描述:255MHZ, LOW JITTER, LVPECL FREQUENCY SYNTHESIZER |
| ICS8431EM11 | 制造商:ICS 功能描述: |
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