hbwhelp@micrel.com or (408) 955-1690 14 Power-On Reset" />
參數(shù)資料
型號: SY89465UMY TR
廠商: Micrel Inc
文件頁數(shù): 6/20頁
文件大?。?/td> 0K
描述: IC CLOCK MUX 2:10 2GHZ 44-MLF
標(biāo)準(zhǔn)包裝: 1,000
系列: Precision Edge®
類型: 多路復(fù)用器
電路數(shù): 1
比率 - 輸入:輸出: 2:10
差分 - 輸入:輸出: 是/是
輸入: CML,LVDS,PECL
輸出: LVDS
頻率 - 最大: 2GHz
電源電壓: 2.375 V ~ 2.625 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 44-VFQFN 裸露焊盤,44-MLF?
供應(yīng)商設(shè)備封裝: 44-MLF?(7x7)
包裝: 帶卷 (TR)
Micrel, Inc.
SY89465U
August 2010
M9999-080510-C
hbwhelp@micrel.com or (408) 955-1690
14
Power-On Reset (POR) Description
The SY89465U includes an internal power-on reset
(POR) function to ensure that the RPE logic starts-
up in a known logic state once the power-supply
voltage is stable. An external capacitor connected
between VCC and the CAP pin (pin 12) controls the
delay for the power-on reset function.
The required capacitor value calculation is based
upon the time the system power supply needs to
power up to a minimum of 2.3V. The time constant
for the internal power-on-reset must be greater than
the time required for the power supply to ramp up to
a minimum of 2.3V.
The following formula describes this relationship:
C( F)
t
(ms)
12(ms/ F)
dPS
μ≥
μ
As an example, if the time required for the system
power supply to power up past 2.3V is 12ms, then
the required capacitor value on pin 12 would be:
C( F)
12ms
12(ms/ F)
μ≥
μ
C(F) ≥ 1F
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