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| 型号： | SL28541BQC |
| 元件分类： | XO, clock |
| 英文描述： | OTHER CLOCK GENERATOR, QCC64 |
| 封装： | ROHS COMPLIANTQFN-64 |
| 文件页数： | 10/34页 |
| 文件大小： | 544K |
| 代理商： | SL28541BQC |
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SL28541
Rev 1.6 July 08, 2008
Page 18 of 34
PWRDWN# (Power down) Clarification
The CKPWRGD/PWRDWN# pin is a dual-function pin. During
initial power up, the pin functions as CKPWRGD. Once
CKPWRGD has been sampled HIGH by the clock chip, the pin
assumes PD# functionality. The PD# pin is an asynchronous
active LOW input used to shut off all clocks cleanly before
shutting off power to the device. This signal is synchronized
internally to the device before powering down the clock
synthesizer. PD# is also an asynchronous input for powering
up the system. When PD# is asserted LOW, clocks are driven
to a LOW value and held before turning off the VCOs and the
crystal oscillator.
PWRDWN# (Power down) Assertion
When PD is sampled HIGH by two consecutive rising edges
of CPUC, all single-ended outputs will be held LOW on their
next HIGH-to-LOW transition and differential clocks must held
LOW. When PD mode is desired as the initial power on state,
PD must be asserted HIGH in less than 10 s after asserting
CKPWRGD.
PWRDWN# Deassertion
The power up latency is less than 1.8 ms. This is the time from
the deassertion of the PD# pin or the ramping of the power
supply until the time that stable clocks are generated from the
clock chip. All differential outputs stopped in a three-state
condition, resulting from power down are driven high in less
than 300 s of PD# deassertion to a voltage greater than
200 mV. After the clock chip’s internal PLL is powered up and
locked, all outputs are enabled within a few clock cycles of
each clock. Figure 4 is an example showing the relationship of
clocks coming up.
PD#
USB, 48MHz
DOT96T
DOT96C
SRCT 100MHz
SRCC 100MHz
CPUT, 133MHz
PCI, 33 MHz
REF
CPUC, 133MHz
Figure 3. Power down Assertion Timing Waveform
D OT 9 6 C
PD#
C P U C , 1 3 3 MH z
C P U T , 1 3 3 MH z
S R C C 1 0 0 MH z
U S B , 4 8 MH z
D OT 9 6 T
S R C T 1 0 0 MH z
Ts ta b le
< 1 .8 m s
P C I, 3 3 MH z
REF
Td r iv e _ PW R D N #
< 3 0 0 s , > 2 0 0 m V
Figure 4. Power down Deassertion Timing Waveform
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SL28541BQCR | 功能描述:时钟发生器及支持产品 Montevina, Atom RoHS:否 制造商:Silicon Labs 类型:Clock Generators 最大输入频率:14.318 MHz 最大输出频率:166 MHz 输出端数量:16 占空比 - 最大:55 % 工作电源电压:3.3 V 工作电源电流:1 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:QFN-56 |
| SL28541BQCRT | 功能描述:时钟发生器及支持产品 Montevina, Atom RoHS:否 制造商:Silicon Labs 类型:Clock Generators 最大输入频率:14.318 MHz 最大输出频率:166 MHz 输出端数量:16 占空比 - 最大:55 % 工作电源电压:3.3 V 工作电源电流:1 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:QFN-56 |
| SL28541BZC | 功能描述:时钟发生器及支持产品 Montevina RoHS:否 制造商:Silicon Labs 类型:Clock Generators 最大输入频率:14.318 MHz 最大输出频率:166 MHz 输出端数量:16 占空比 - 最大:55 % 工作电源电压:3.3 V 工作电源电流:1 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:QFN-56 |
| SL28541BZC-2 | 功能描述:时钟发生器及支持产品 Montevina, Atom RoHS:否 制造商:Silicon Labs 类型:Clock Generators 最大输入频率:14.318 MHz 最大输出频率:166 MHz 输出端数量:16 占空比 - 最大:55 % 工作电源电压:3.3 V 工作电源电流:1 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:QFN-56 |
| SL28541BZC-2T | 功能描述:时钟发生器及支持产品 Montevina, Atom RoHS:否 制造商:Silicon Labs 类型:Clock Generators 最大输入频率:14.318 MHz 最大输出频率:166 MHz 输出端数量:16 占空比 - 最大:55 % 工作电源电压:3.3 V 工作电源电流:1 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:QFN-56 |
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