PIC16C71 datasheet(135/337 Pages) MICROCHIP

135 / 337 page

DS30234D-page 135

PIC16C6X

FIGURE 13-14: 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 devices electrical speciﬁcations.

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 Electrostatic Overstress (EOS).

VDD

MCLR

PIC16CXX

FIGURE 13-15: EXTERNAL BROWN-OUT

PROTECTION CIRCUIT 1

FIGURE 13-16: 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

PIC16C62A/R62/63/R63/64A/R64/65A/

R65/66/67 should be disabled when using

this circuit.

3: Resistors should be adjusted for the

characteristics of the transistors.

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

PIC16C62A/R62/63/R63/64A/R64/65A/

R65/66/67 should be disabled when using

this circuit.

3: Resistors should be adjusted for the

characteristics of the transistors.

VDD •

R1 + R2

= 0.7V

VDD

40k

VDD

MCLR

PIC16CXX

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