PIC16C83 datasheet(46/117 Pages) MICROCHIP

46 / 117 page

PIC16C8X

DS30081F-page 46

FIGURE 8-13: EXTERNAL POWER-ON

RESET CIRCUIT (FOR SLOW

VDD POWER-UP)

Note 1: External Power-on Reset circuit is

required only if VDD power-up rate is too

slow. The diode D helps discharge the

capacitor quickly when VDD powers down.

2: R < 40 k

Ω is recommended to make sure

that voltage drop across R does not exceed

0.2V (max leakage current spec on MCLR

pin is 5

µA). A larger voltage drop will

degrade VIH level on the MCLR pin.

3: R1 = 100

Ω to 1 kΩ will limit any current

ﬂowing into MCLR from external

capacitor C in the event of an MCLR pin

breakdown due to ESD or EOS.

VDD

MCLR

PIC16CXX

VDD

FIGURE 8-14: BROWN-OUT PROTECTION

CIRCUIT 1

FIGURE 8-15: BROWN-OUT PROTECTION

CIRCUIT 2

This circuit will activate reset when VDD goes below

(Vz + 0.7V) where Vz = Zener voltage.

VDD

33k

10k

40k

VDD

MCLR

PIC16CXX

This brown-out circuit is less expensive, although less

accurate. Transistor Q1 turns off when VDD is below a

certain level such that:

VDD •

R1 + R2

= 0.7V

40k

VDD

MCLR

PIC16CXX

VDD

PIC16C83 Datasheet(PDF) 46 Page - Microchip Technology

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