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| 型号： | ICS8431AM-21LF |
| 厂商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分类： | 时钟产生/分配 |
| 英文描述： | 350 MHz, OTHER CLOCK GENERATOR, PDSO28 |
| 封装： | 7.50 X 18.05 MM, 2.25 MM HEIGHT, ROHS COMPLIANT, MS-013, MO-119, SOIC-28 |
| 文件页数： | 1/19页 |
| 文件大小： | 342K |
| 代理商： | ICS8431AM-21LF |
350MHZ, LOW JITTER, CRYSTAL OSCILLATOR-TO-
3.3V LVPECL FREQUENCY SYNTHESIZER
ICS8431-21
IDT / ICS 3.3V LVPECL FREQUENCY SYNTHESIZER
1
ICS8431AM-21 REV. A MAY 30, 2007
GENERAL DESCRIPTION
The ICS8431-21 is a general purpose clock fre-
quency synthesizer for IA64/32 application and a
member of the HiPerClockS family of High Perfor-
mance Clock Solutions from IDT. The VCO oper-
ates 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 inter-
face, 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 ICS8431-21 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 ICS8431-21 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 oscillator
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
FEATURES
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
0°C to 85°C ambient operating temperature
Replaces ICS8431-01 and ICS8431-11
Available in both standard (RoHS 5) and lead-free (RoHS 6)
packages
BLOCK DIAGRAM
PIN ASSIGNMENT
SSC_CTL1
M0
M1
M2
M3
M4
M5
M6
M7
M8
SSC_CTL0
SSC_CTL1
VEE
TEST_I/O
VCC
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
VCC
XTAL_IN
XTAL_OUT
nc
VCCA
VEE
MR
DIV_SEL
VCCO
FOUT
nFOUT
VEE
ICS8431-21
28-Lead SOIC
7.5mm x 18.05mm x 2.25mm package body
M Package
Top View
DIV_SEL
HiPerClockS
ICS
相关PDF资料 |
PDF描述 |
|---|---|
| ICS8431AMI-21LF | 350 MHz, OTHER CLOCK GENERATOR, PDSO28 |
| ICS8431CM-01LF | 200 MHz, OTHER CLOCK GENERATOR, PDSO28 |
| ICS8431CM-11T | 255 MHz, OTHER CLOCK GENERATOR, PDSO28 |
| ICS8431CM-11LFT | 255 MHz, OTHER CLOCK GENERATOR, PDSO28 |
| ICS8431DMI-01 | 200 MHz, OTHER CLOCK GENERATOR, PDSO28 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ICS8431AM-21LFT | 功能描述:IC SYNTHESIZER 350MHZ 28-SOIC RoHS:是 类别:集成电路 (IC) >> 时钟/计时 - 时钟发生器，PLL，频率合成器 系列:HiPerClockS™ 标准包装:1,000 系列:- 类型:时钟/频率合成器，扇出分配 PLL:- 输入:- 输出:- 电路数:- 比率 - 输入:输出:- 差分 - 输入:输出:- 频率 - 最大:- 除法器/乘法器:- 电源电压:- 工作温度:- 安装类型:表面贴装 封装/外壳:56-VFQFN 裸露焊盘 供应商设备封装:56-VFQFP-EP（8x8） 包装:带卷 (TR) 其它名称:844S012AKI-01LFT |
| ICS8431AM-21T | 制造商:ICS 制造商全称:ICS 功能描述:350MHZ, LOW JITTER, CRYSTAL OSCILLATOR-TO-3.3V LVPECL FREQUENCY SYNTHESIZER |
| ICS8431AMI-21 | 制造商:ICS 制造商全称:ICS 功能描述:350MHZ, LOW JITTER, CRYSTAL OSCILLATOR-TO-3.3V LVPECL FREQUENCY SYNTHESIZER |
| ICS8431AMI-21LF | 功能描述:IC SYNTHESIZER 350MHZ 28-SOIC RoHS:是 类别:集成电路 (IC) >> 时钟/计时 - 时钟发生器，PLL，频率合成器 系列:HiPerClockS™ 标准包装:27 系列:Precision Edge® 类型:频率合成器 PLL:是 输入:PECL，晶体 输出:PECL 电路数:1 比率 - 输入:输出:1:1 差分 - 输入:输出:无/是 频率 - 最大:800MHz 除法器/乘法器:是/无 电源电压:3.135 V ~ 5.25 V 工作温度:0°C ~ 85°C 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC 包装:管件 |
| ICS8431AMI-21LFT | 功能描述:IC SYNTHESIZER 350MHZ 28-SOIC RoHS:是 类别:集成电路 (IC) >> 时钟/计时 - 时钟发生器，PLL，频率合成器 系列:HiPerClockS™ 标准包装:1,000 系列:- 类型:时钟/频率合成器，扇出分配 PLL:- 输入:- 输出:- 电路数:- 比率 - 输入:输出:- 差分 - 输入:输出:- 频率 - 最大:- 除法器/乘法器:- 电源电压:- 工作温度:- 安装类型:表面贴装 封装/外壳:56-VFQFN 裸露焊盘 供应商设备封装:56-VFQFP-EP（8x8） 包装:带卷 (TR) 其它名称:844S012AKI-01LFT |
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