参数资料
型号: ICS674R-01LFT
厂商: IDT, Integrated Device Technology Inc
文件页数: 3/8页
文件大小: 0K
描述: IC DIVIDER USER CONFIG 28-SSOP
标准包装: 2,500
类型: 时钟除法器
PLL:
输入: 时钟
输出: 时钟
电路数: 1
比率 - 输入:输出: 2:2
差分 - 输入:输出: 无/无
频率 - 最大: 235MHz
除法器/乘法器: 是/无
电源电压: 3 V ~ 5.5 V
工作温度: 0°C ~ 70°C
安装类型: 表面贴装
封装/外壳: 28-SSOP(0.154",3.90mm 宽)
供应商设备封装: 28-QSOP
包装: 带卷 (TR)
其它名称: 674R-01LFT
ICS674-01
USER CONFIGURABLE DIVIDER
CLOCK DIVIDER
IDT / ICS USER CONFIGURABLE DIVIDER
3
ICS674-01
REV H 051310
External Components
The ICS674-01 requires a minimum number of external components for proper operation. A 0.01
F decoupling
capacitor should be connected between each VDD and GND as close to the device as possible. A series
termination resistor of 33
should be used in series with OUTA and OUTB pins.
Determining (setting) the Divider
The user has full control in setting the desired divide. The user should connect the appropriate divider select input
pins directly to ground (or VDD, although this is not required because of internal pull-ups) during Printed Circuit
Board layout, ensuring that the ICS674-01 will automatically produce the correct divide when all components are
soldered. It is also possible to connect the inputs to parallel I/O ports in order to change divides. The divides of the
ICS674-01 can be determined by the following equations:
Divide A = DAW + 2
Where
Divider A Word (DAW) = 1 to 127 (0 is not permitted)
Divide B = (DBW+8) x PD
Where
Divider B Word (DBW) = 4 to 511 (0, 1, 2, 3 are not permitted)
Post Divider (PD) = values on page 2
For example, suppose Divide A is desired to be 61 and Divide B is desired to be 284, then DAW = 59,
DBW = 276, and PD = 1. This means A6:A0 is 0111011, B8:B0 is 100010100 and S2:S0 is 110. Since all inputs
have pull-ups, it is only necessary to ground the zero pins, namely A6, A2, B7, B6, B5, B1, B0, and S0.
These configuration pins can be changed at any time during operation.
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