PIC16LC71 datasheet(60/176 Pages) MICROCHIP

60 / 176 page

PIC16C71X

DS30272A-page 60

FIGURE 8-14: 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

Ω is recommended to make sure

that voltage drop across R does not violate

the device’s electrical speciﬁcation.

3: R1 = 100

Ω to 1 kΩ will limit any current

ﬂowing 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

PIC16CXX

FIGURE 8-15: EXTERNAL BROWN-OUT

PROTECTION CIRCUIT 1

FIGURE 8-16: 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: Internal brown-out detection on the

PIC16C710/711/715 should be disabled

when using this circuit.

3: Resistors should be adjusted for the char-

acteristics of the transistor.

VDD

33k

10k

40k

VDD

MCLR

PIC16CXX

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: Internal brown-out detection on the

PIC16C710/711/715 should be disabled

when using this circuit.

3: Resistors should be adjusted for the

characteristics of the transistor.

VDD •

R1 + R2

= 0.7V

VDD

40k

VDD

MCLR

PIC16CXX

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