hbwhelp@micrel.com or (408) 955-1690 14 Power-On Reset" />
參數(shù)資料
型號(hào): SY58621LMG
廠商: Micrel Inc
文件頁(yè)數(shù): 6/20頁(yè)
文件大?。?/td> 0K
描述: TXRX 3.2GBPS CML/LVPECL 24-MLF
標(biāo)準(zhǔn)包裝: 75
系列: SY58
邏輯類型: CML/LVPECL 背板收發(fā)器,帶集成環(huán)回
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(yīng)商設(shè)備封裝: 24-MLF?(4x4)
包裝: 管件
產(chǎn)品目錄頁(yè)面: 1089 (CN2011-ZH PDF)
其它名稱: 576-2538
SY58621LMG-ND
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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