參數(shù)資料
型號: MPC9773AE
廠商: IDT, Integrated Device Technology Inc
文件頁數(shù): 2/21頁
文件大?。?/td> 0K
描述: IC PLL CLK GEN 1:12 3.3V 52-LQFP
標準包裝: 160
類型: PLL 時鐘發(fā)生器
PLL: 帶旁路
輸入: LVCMOS,LVPECL
輸出: LVCMOS
電路數(shù): 1
比率 - 輸入:輸出: 3:12
差分 - 輸入:輸出: 是/無
頻率 - 最大: 242.5MHz
除法器/乘法器: 是/無
電源電壓: 3.135 V ~ 3.465 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 52-LQFP
供應商設備封裝: 52-TQFP(10x10)
包裝: 托盤
MPC9773 REVISION 6 JANUARY 31, 2013
10
2013 Integrated Device Technology, Inc.
MPC9773 Data Sheet
3.3 V 1:12 LVCMOS PLL CLOCK GENERATOR
MPC9773 Individual Output Disable (Clock Stop)
Circuitry
The individual clock stop (output enable) control of the
MPC9773 allows designers, under software control, to
implement power management into the clock distribution
design. A simple serial interface and a clock stop control logic
provides a mechanism through which the MPC9773 clock
outputs can be individually stopped in the logic ‘0’ state: The
clock stop mechanism allows serial loading of a 12-bit serial
input register. This register contains one programmable clock
stop bit for 12 of the 14 output clocks. The QC0 and QFB
outputs cannot be stopped (disabled) with the serial port.
The user can program an output clock to stop (disable) by
writing logic ‘0’ to the respective stop enable bit. Likewise, the
user may programmably enable an output clock by writing
logic ‘1’ to the respective enable bit. The clock stop logic
enables or disables clock outputs during the time when the
output would normally be in logic low state, eliminating the
possibility of short or ‘runt’ clock pulses.
The user can write to the serial input register through the
STOP_DATA input by supplying a logic ‘0’ start bit followed
serially by 12 NRZ disable/enable bits. The period of each
STOP_DATA bit equals the period of the free-running
STOP_CLK signal. The STOP_DATA serial transmission
should be timed so the MPC9773 can sample each
STOP_DATA bit with the rising edge of the free-running
STOP_CLK signal. (See Figure 5.)
Figure 5. Clock Stop Circuit Programing
STOP_CLK
STOP_DATA
START
QA0
QA1
QA2
QA3
QB0
QB1
QB2
QB3
QC1
QC2
QC3
QSYNC
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