PIC16C62XAT-20I/SO View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16C62XAT-20I/SO

EPROM-Based 8-Bit CMOS Microcontroller

Microchip Technology 

PIC16C62X

FIGURE 9-12: EXTERNAL POWER-ON

RESET CIRCUIT (FOR SLOW

VDD POWER-UP)

VDD

VDD

D

R

R1

MCLR

C

PIC16C62X

Note 1: External power-on reset circuit is required

only if VDD power-up slope is too slow.

The diode D helps discharge the capaci-

tor quickly when VDD powers down.

2: < 40 kΩ is recommended to make sure

that voltage drop across R does not vio-

late the device’s electrical specification.

3: R1 = 100Ω to 1 kΩ will limit any current

flowing into MCLR from external capaci-

tor C in the event of MCLR/VPP pin break-

down due to Electrostatic Discharge

(ESD) or Electrical Overstress (EOS).

FIGURE 9-13: EXTERNAL BROWN-OUT

PROTECTION CIRCUIT 1

VDD

33k

VDD

10k

MCLR

40k PIC16C62X

Note 1: This circuit will activate reset when VDD

goes below (Vz + 0.7V) where

Vz = Zener voltage.

2: Internal Brown-out Reset circuitry

should be disabled when using this cir-

cuit.

FIGURE 9-14: EXTERNAL BROWN-OUT

PROTECTION CIRCUIT 2

VDD

R1

VDD

Q1

MCLR

R2

40k PIC16C62X

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:

R1

VDD x R1 + R2 = 0.7 V

2: Internal brown-out reset should be dis-

abled when using this circuit.

3: Resistors should be adjusted for the

characteristics of the transistor.

DS30235G-page 54

Preliminary

© 1998 Microchip Technology Inc.

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