PIC16LC8X View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16LC8X

8-Bit CMOS EEPROM Microcontrollers

Microchip Technology 

PIC16C8X

FIGURE 8-13: EXTERNAL POWER-ON

RESET CIRCUIT (FOR SLOW

VDD POWER-UP)

VDD

VDD

D

R

C

R1

MCLR

PIC16CXX

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 kΩ 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 = 100Ω 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.

FIGURE 8-14: BROWN-OUT PROTECTION

CIRCUIT 1

VDD

33k

VDD

10k

MCLR

40k PIC16CXX

This circuit will activate reset when VDD goes below

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

FIGURE 8-15: BROWN-OUT PROTECTION

CIRCUIT 2

VDD

VDD

R1

Q1

MCLR

R2

40k 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 = 0.7V

R1 + R2

DS30081F-page 46

© 1995 Microchip Technology Inc.

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