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EM78P447SBWM 参数 Datasheet PDF下载

EM78P447SBWM图片预览
型号: EM78P447SBWM
PDF下载: 下载PDF文件 查看货源
内容描述: 8位微控制器 [8-BIT MICRO-CONTROLLER]
分类和应用: 微控制器外围集成电路光电二极管可编程只读存储器
文件页数/大小: 55 页 / 1601 K
品牌: ELAN [ ELAN MICROELECTRONICS CORP ]
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EM78P447S  
OTP ROM  
4.11 Residue-Voltage Protection  
When battery is replaced, device power (Vdd) is taken off but residue-voltage remains. The residue-voltage may trips  
below Vdd minimum, but not to zero. This condition may cause a poor power on reset. Fig.16 and Fig.17 show how to build  
the residue-voltage protection circuit.  
Vdd  
Vdd  
33K  
EM78P447N  
Q1  
10K  
/RESET  
40K  
1N4684  
Fig.14 The Residue Voltage Protection Circuit 1  
Vdd  
Vdd  
R1  
EM78P447N  
/RESET  
Q1  
R2  
40K  
Fig.15 The Residue Voltage Protection Circuit 2  
This specification is subject to change without prior notice.  
29  
06.25.2003 (V1.1)  
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