PIC16C641 Datasheet

IC型号：
PIC16C641
PDF描述：
8-Bit EPROM Microcontrollers with Analog Comparators
文件大小：
661.21KB
PDF页数：
137页
芯片厂家：
MICROCHIP

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PIC16C64X & PIC16C66X

FIGURE 9-12: EXTERNAL POWER-ON

RESET CIRCUIT (FOR SLOW

POWER-UP)

FIGURE 9-14: EXTERNAL BROWN-OUT

PROTECTION CIRCUIT 2

MCLR

40k

PIC16CXXX

Note 1: External power-on reset circuit is required

only if V

power-up slope is too slow.

The diode D helps discharge the capaci-

tor quickly when V

powers down.

2: R < 40 k鈩?is recommended to make sure

that voltage drop across R does not vio-

late the device鈥檚 electrical speci铿乧ation.

3: R1 = 100鈩?to 1 k鈩?will limit any current

铿俹wing into MCLR from external capaci-

tor C in the event of MCLR/V

breakdown due to Electrostatic Dis-

charge (ESD) or Electrical Overstress

(EOS).

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

albeit less accurate. Transistor Q1 turns

off when V

is below a certain level

such that:

鈥?/div>

R1 + R2

= 0.7 V

2: Internal Brown-out Reset circuitry

should be disabled when using this cir-

cuit.

3: Resistors should be adjusted for the

characteristics of the transistor.

FIGURE 9-13: EXTERNAL BROWN-OUT

PROTECTION CIRCUIT 1

33k

10k

40k

MCLR

PIC16CXXX

Note 1: This circuit will activate reset when V

goes below (Vz + 0.7V) where

Vz = Zener voltage.

2: Internal Brown-out Reset circuitry

should be disabled when using this cir-

cuit.

3: Resistors should be adjusted for the

characteristics of the transistor.

漏

1996 Microchip Technology Inc.

Preliminary

DS30559A-page 65

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