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参数资料
| 型号： | MK1491-09FTR |
| 厂商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分类： | 时钟产生/分配 |
| 英文描述： | 66 MHz, PROC SPECIFIC CLOCK GENERATOR, PDSO28 |
| 封装： | 0.209 INCH, MO-150, SSOP-28 |
| 文件页数： | 5/10页 |
| 文件大小： | 200K |
| 代理商： | MK1491-09FTR |
MK1491-09
AMD GEODE GX2 CLOCK SOURCE
CLOCK SYNTHESIZER
IDT / ICS AMD GEODE GX2 CLOCK SOURCE
4
MK1491-09
REV K 072406
Power Down Control Table
Power-on Default Conditions
External Components
The MK1491-09 requires some inexpensive external
components for proper operation. Decoupling capacitors of
0.1F should be connected on each VDD pin to ground, as
close to the MK1491-09 as possible. A series termination
resistor of 33
may be used for each clock output. See the
discussion below for other external resistors required for
proper I/O operation. The 14.318 MHz oscillator has internal
caps that provide the proper load for a parallel resonant
crystal with CL=18 pF. For tuning with other values of CL, the
formula 2*(CL-18) gives the value of each capacitor that
should be connected between X1 and ground and X2 and
ground.
I/O Structure
The MK1491-09 provides more functionality in a 28-pin
package by using a unique I/O technique. The device
checks the status of all I/O pins during power-up. This status
(pulled high or low) then determines the frequency
selections and power down modes (see the tables on pages
2 and 3). Within 10ms after power up, the inputs change to
outputs and the clocks start up. In the diagrams below, the
33
resistors are the normal output termination resistors.
The 10k
resistor pulls low to generate a logic zero when
needed. Weak internal pull-up resistors are present on TS#,
Spread#, PD#, and Sel66/33 to pull the pin to high when left
floating.
*Note: Do not use a TTL load. This will overcome the 10 k
pull-down and force the input to a logic 1.
PD#
Functions
0
All clocks are stopped low.
1
All clocks are running.
Pin #
Function
Default
Condition
14
TS#
H
Latched input. All outputs enabled when high. When low, all outputs are in
tristate.
27
Spread#
H
Latched input. Spread disabled when high. When low, spread is enabled
on all outputs except ref clocks and 48 MHz.
10
Sel66/33#
H
This is an active input. When high, it selects PCI=66 MHz outputs; when
low, selects PCI frequency = 33 MHz outputs.
33
To load*
10 k
I/O
For select
= 0 (low)
Do not stuff for
“1” selection
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MK1491-14 | 制造商:ICS 制造商全称:ICS 功能描述:OPTi ACPI Firestar Clock Source |
| MK1491E-14R | 功能描述:IC CLK SRC OPTI ACPI FIRE 28QSOP RoHS:否 类别:集成电路 (IC) >> 时钟/计时 - 专用 系列:- 标准包装:1,500 系列:- 类型:时钟缓冲器/驱动器 PLL:是 主要目的:- 输入:- 输出:- 电路数:- 比率 - 输入:输出:- 差分 - 输入:输出:- 频率 - 最大:- 电源电压:3.3V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:28-SSOP（0.209"，5.30mm 宽） 供应商设备封装:28-SSOP 包装:带卷 (TR) 其它名称:93786AFT |
| MK1491E-14RLF | 功能描述:IC CLK SRC OPTI ACPI FIRE 28QSOP RoHS:是 类别:集成电路 (IC) >> 时钟/计时 - 专用 系列:- 标准包装:28 系列:- 类型:时钟/频率发生器 PLL:是 主要目的:Intel CPU 服务器 输入:时钟 输出:LVCMOS 电路数:1 比率 - 输入:输出:3:22 差分 - 输入:输出:无/是 频率 - 最大:400MHz 电源电压:3.135 V ~ 3.465 V 工作温度:0°C ~ 85°C 安装类型:表面贴装 封装/外壳:64-TFSOP （0.240"，6.10mm 宽） 供应商设备封装:64-TSSOP 包装:管件 |
| MK1491E-14RLFTR | 功能描述:IC CLK SRC OPTI ACPI FIRE 28QSOP RoHS:是 类别:集成电路 (IC) >> 时钟/计时 - 专用 系列:- 标准包装:28 系列:- 类型:时钟/频率发生器 PLL:是 主要目的:Intel CPU 服务器 输入:时钟 输出:LVCMOS 电路数:1 比率 - 输入:输出:3:22 差分 - 输入:输出:无/是 频率 - 最大:400MHz 电源电压:3.135 V ~ 3.465 V 工作温度:0°C ~ 85°C 安装类型:表面贴装 封装/外壳:64-TFSOP （0.240"，6.10mm 宽） 供应商设备封装:64-TSSOP 包装:管件 |
| MK1491E-14RTR | 功能描述:IC CLK SRC OPTI ACPI FIRE 28QSOP RoHS:否 类别:集成电路 (IC) >> 时钟/计时 - 专用 系列:- 标准包装:1,500 系列:- 类型:时钟缓冲器/驱动器 PLL:是 主要目的:- 输入:- 输出:- 电路数:- 比率 - 输入:输出:- 差分 - 输入:输出:- 频率 - 最大:- 电源电压:3.3V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:28-SSOP（0.209"，5.30mm 宽） 供应商设备封装:28-SSOP 包装:带卷 (TR) 其它名称:93786AFT |
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