參數(shù)資料
型號: PT7C4307WEX
廠商: Pericom
文件頁數(shù): 6/16頁
文件大?。?/td> 0K
描述: IC RTC ALARM NVSRAM 8SOIC
標(biāo)準(zhǔn)包裝: 1
類型: 時鐘/日歷
特點: 警報器,閏年,NVSRAM,方波輸出
存儲容量: 56B
時間格式: HH:MM:SS(12/24 小時)
數(shù)據(jù)格式: YY-MM-DD-dd
接口: I²C,2 線串口
電源電壓: 4.5 V ~ 5.5 V
電壓 - 電源,電池: 2 V ~ 3.5 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 8-SOIC(0.154",3.90mm 寬)
供應(yīng)商設(shè)備封裝: 8-SOIC
包裝: 標(biāo)準(zhǔn)包裝
其它名稱: PT7C4307WEXDKR
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PT0206(08/09)
Ver: 3
14
Data Sheet
PT7C4307
Real-time Clock Module (I
2C Bus)
Recommended Layout for Crystal
Built-in Capacitors Specifications and Recommended External Capacitors
Parameter
Symbol
Typ
Unit
X1 to GND
CG
20
pF
Build-in capacitors
X2 to GND
CD
20
pF
X1 to GND
C1
4
pF
Recommended External
capacitors
X2 to GND
C2
4
pF
Note: The frequency of crystal can be optimized by external capacitor C1 and C2, for frequency=32.768Hz, C1 and C2 should meet
the equation as below:
Cpar + [(C1+CG)*(C2+CD)]/ [(C1+CG)+(C2+CD)] =CL
Cpar is all parasitical capacitor between X1 and X2.
CL is crystal’s load capacitance.
Crystal Specifications
Parameter
Symbol
Min
Typ
Max
Unit
Nominal Frequency
fO
-
32.768
-
kHz
Series Resistance
ESR
-
70
k
Load Capacitance
CL
-
12.5
-
pF
Note: The crystal, traces and crystal input pins
should be isolated from RF generating signals.
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