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參數(shù)資料
| 型號(hào)： | PT7C43390WEX |
| 廠商： | Pericom |
| 文件頁數(shù)： | 14/23頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC REAL TIME CLOCK 8SOIC |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 類型： | 時(shí)鐘/日歷 |
| 特點(diǎn)： | 警報(bào)器，閏年，方波輸出 |
| 時(shí)間格式： | HH:MM:SS（12/24 小時(shí)） |
| 數(shù)據(jù)格式： | YY-MM-DD-dd |
| 接口： | I²C，2 線串口 |
| 電源電壓： | 1.3 V ~ 5.5 V |
| 電壓 - 電源，電池： | 1.1 V ~ 5.5 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： | PT7C43390WEXDKR |
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PT0280(08/09)
Ver: 3
21
Data Sheet
PT7C43390
2-Wire Real-time Clock Module
Recommended Layout for Crystal
Built-in Capacitors Specifications and Recommended External Capacitors
Parameter
Symbol
Typ
Unit
X1 to GND
CG
5
pF
Build-in capacitors
X2 to GND
CD
5
pF
X1 to GND
C1
18
pF
Recommended External capacitors for
crystal CL=12.5pF
X2 to GND
C2
18
pF
X1 to GND
C1
7
pF
Recommended External capacitors for
crystal CL=6pF
X2 to GND
C2
7
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
-
6/12.5
-
pF
Note: The crystal, traces and crystal input pins
should be isolated from RF generating signals.
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