PIC16C554T-08CL 查看數據表（PDF） - Microchip Technology

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PIC16C554T-08CL

EPROM-Based 8-Bit CMOS Microcontrollers

Microchip Technology 

PIC16C55X

FIGURE 6-9:

TIMEOUT SEQUENCE ON POWER-UP (MCLR TIED TO VDD): CASE 3

VDD

MCLR

INTERNAL POR

PWRT TIMEOUT

TPWRT

OST TIMEOUT

INTERNAL RESET

FIGURE 6-10:

VDD

VDD

EXTERNAL POWER-ON

RESET CIRCUIT (FOR

SLOW VDD POWER-UP)

D

R

R1

MCLR

C

PIC16C55X

TOST

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: < 40 k is recommended to make sure that voltage

drop across R does not violate the device’s electrical

specification.

3: R1 = 100 to 1 k will limit any current flowing into

MCLR from external capacitor C in the event of

MCLR/VPP pin breakdown due to Electrostatic Dis-

charge (ESD) or Electrical Overstress (EOS).

DS40143E-page 40

Preliminary

 1996-2013 Microchip Technology Inc.

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