參數資料
型號: SY89845UMG TR
廠商: Micrel Inc
文件頁數: 4/18頁
文件大?。?/td> 0K
描述: IC MUX CML RPE 2:1 PREC 24-MLF
標準包裝: 1,000
系列: SY89
類型: 多路復用器
電路: 1 x 2:1
獨立電路: 1
電壓電源: 單電源
電源電壓: 3 V ~ 3.6 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 24-VFQFN 裸露焊盤,24-MLF?
供應商設備封裝: 24-MLF?(4x4)
包裝: 帶卷 (TR)
其它名稱: SY89845UMGTR
SY89845UMGTR-ND
Micrel, Inc.
SY89845U
May 2005
M9999-052405
hbwhelp@micrel.com or (408) 955-1690
12
Power-On Reset (POR) Description
The SY89845U includes an internal power-on reset
(POR) function to ensure 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 16) 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
dPS(m s)
12(ms/
F)
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 16 would be:
C(
F) ≥
12ms
12(ms/
F)
C(F)
≥ 1F
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