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参数资料
| 型号： | CS2000P-DZZR |
| 厂商： | CIRRUS LOGIC INC |
| 元件分类： | PLL合成/DDS/VCOs |
| 中文描述： | PHASE LOCKED LOOP, 30 MHz, PDSO10 |
| 封装： | 3 MM, LEAD FREE, MO-187, MSOP-10 |
| 文件页数： | 7/26页 |
| 文件大小： | 251K |
| 代理商： | CS2000P-DZZR |
CS2100-CP
DS840F2
15
Regardless of the setting of the ClkSkipEn bit the PLL output will continue for 223 SysClk cycles (466 ms
to 1048 ms) after CLK_IN is removed (see Figure 12). This is true as long as CLK_IN does not glitch or
have an effective change in period as the clock source is removed, otherwise the PLL will interpret this as
a change in frequency causing clock skipping and the 223 SysClk cycle time-out to be bypassed and the
PLL to immediately unlock. If the prior conditions are met while CLK_IN is removed and 223 SysClk cycles
pass, the PLL will unlock and the PLL_OUT state will be determined by the ClkOutUnl bit; See “PLL Clock
Output” on page 20. If CLK_IN is re-applied after such time, the PLL will remain unlocked for the specified
time listed in the “AC Electrical Characteristics” on page 7 after which lock will be acquired and the PLL
output will resume.
If it is expected that CLK_IN will be removed and then reapplied within 223 SysClk cycles but later than
tCS, the ClkSkipEn bit should be disabled. If it is not disabled, the device will behave as shown in
Figure 13; note that the lower figure shows that the PLL output frequency may change and be incorrect
without an indication of an unlock condition.
Figure 12. CLK_IN removed for > 223 SysClk cycles
CLK_IN
PLL_OUT
UNLOCK
ClkSkipEn=0 or 1
ClkOutUnl=0
Lock Time
CLK_IN
PLL_OUT
UNLOCK
ClkSkipEn=0 or 1
ClkOutUnl=1
Lock Time
= invalid clocks
223 SysClk cycles
CLK_IN
PLL_OUT
UNLOCK
ClkSkipEn=0 or 1
ClkOutUnl=0
Lock Time
CLK_IN
PLL_OUT
UNLOCK
ClkSkipEn=0 or 1
ClkOutUnl=1
Lock Time
tCS
= invalid clocks
CLK_IN
PLL_OUT
UNLOCK
ClkSkipEn= 1
ClkOutUnl= 0 or 1
Lock Time
tCS
= invalid clocks
223 SysClk cycles
Figure 13. CLK_IN removed for < 223 SysClk cycles but > tCS
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相关代理商/技术参数 |
参数描述 |
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