PIC18F452-I/ML【PDF 16/134 页】IC MCU FLASH 16KX16 A/D 44QFN

收藏本站

您好，
买卖IC网欢迎您。
请登录
免费注册

买卖IC网

Sheet目录3813

12页 13页 14页 15页 [16页]17页 18页 19页 20页

PIC16C9XX

DS30444E - page 112

1997 Microchip Technology Inc.

FIGURE 14-11:EXTERNAL POWER-ON

RESET CIRCUIT (FOR SLOW

VDD POWER-UP)

Note 1: External Power-on Reset circuit is required

only if VDD power-up slope is too slow. The

diode D helps discharge the capacitor

quickly when VDD powers down.

2: R < 40 k

is recommended to make sure

that voltage drop across R does not violate

the device’s electrical specication.

3: R1 = 100

to 1 k will limit any current

owing into MCLR from external capacitor

C in the event of MCLR/VPP pin break-

down due to Electrostatic Discharge

(ESD) or Electrical Overstress (EOS).

VDD

MCLR

PIC16CXXX

FIGURE 14-12:EXTERNAL BROWN-OUT

PROTECTION CIRCUIT 1

FIGURE 14-13:EXTERNAL BROWN-OUT

PROTECTION CIRCUIT 2

Note 1: This circuit will activate reset when VDD

goes below (Vz + 0.7V) where Vz = Zener

voltage.

2: Resistors should be adjusted for the char-

acteristics of the transistors.

VDD

33k

10k

40k

VDD

MCLR

PIC16CXXX

Note 1: This brown-out circuit is less expensive,

albeit less accurate. Transistor Q1 turns

off when VDD is below a certain level

such that:

2: Resistors should be adjusted for the

characteristics of the transistors.

VDD

R1 + R2

= 0.7V

VDD

40k

VDD

MCLR

PIC16CXXX

发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

*型号	*数量	厂商	批号	封装

添加更多采购

采购需求

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

我的联系方式