參數資料
型號: CY28445LFXC-5
廠商: Silicon Laboratories Inc
文件頁數: 8/25頁
文件大?。?/td> 0K
描述: IC CLOCK CALISTOGA CK410M 68QFN
標準包裝: 260
類型: 時鐘/頻率發(fā)生器
PLL:
主要目的: Intel CPU 服務器
輸入: LVTTL,晶體
輸出: HCSL,LVCMOS
電路數: 1
比率 - 輸入:輸出: 3:22
差分 - 輸入:輸出: 無/是
頻率 - 最大: 200MHz
電源電壓: 3.135 V ~ 3.465 V
工作溫度: 0°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 68-VFQFN 裸露焊盤
供應商設備封裝: 68-QFN(8x8)
包裝: 托盤
CY28445-5
..................... Document #: 38-07739 Rev *C Page 16 of 25
CPU_STP# Assertion
The CPU_STP# signal is an active low input used for
synchronous stopping and starting the CPU output clocks
while the rest of the clock generator continues to function.
When the CPU_STP# pin is asserted, all CPU outputs that are
set with the SMBus configuration to be stoppable via assertion
of CPU_STP# will be stopped within two–six CPU clock
periods after being sampled by two rising edges of the internal
CPUC clock. The final states of the stopped CPU signals are
CPUT = HIGH and CPUC = LOW. There is no change to the
output drive current values during the stopped state. The
CPUT is driven HIGH with a current value equal to 6 x (Iref),
and the CPUC signal will be Tri-stated.
CPU_STP# Deassertion
The deassertion of the CPU_STP# signal will cause all CPU
outputs that were stopped to resume normal operation in a
synchronous manner. Synchronous manner meaning that no
short or stretched clock pulses will be produce when the clock
resumes. The maximum latency from the deassertion to active
outputs is no more than two CPU clock cycles.
Figure 5. PD Deassertion Timing Waveform
DOT96C
PD
CPUC, 133MHz
CPUT, 133MHz
SRCC 100MHz
USB, 48MHz
DOT96T
SRCT 100MHz
Tstable
<1.8 ms
PCI, 33MHz
REF
Tdrive_PWRDN#
<300 s, > 200 mV
CPU_STP#
CPUT
CPUC
Figure 6. CPU_STP# Assertion Waveform
CPU_STP#
CPUT
CPUC
CPUT Internal
Tdrive_CPU_STP#, 10 ns >200 mV
CPUC Internal
Figure 7. CPU_STP# Deassertion Waveform
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