PIC17C752T-25I/PQQTP 데이터 시트보기 (PDF) - Microchip Technology

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PIC17C752T-25I/PQQTP

High-Performance 8-Bit CMOS EPROM Microcontrollers

Microchip Technology 

PIC17C75X

In Figure 5-5, Figure 5-6 and Figure 5-7, TPWRT >

TOST, as would be the case in higher frequency crys-

tals. For lower frequency crystals, (i.e., 32 kHz) TOST

would be greater.

FIGURE 5-5: TIME-OUT SEQUENCE ON POWER-UP (MCLR TIED TO VDD)

VDD

MCLR

INTERNAL POR

PWRT TIME-OUT

OST TIME-OUT

TPWRT

TOST

INTERNAL RESET

FIGURE 5-6: TIME-OUT SEQUENCE ON POWER-UP (MCLR NOT TIED TO VDD)

VDD

MCLR

INTERNAL POR

PWRT TIME-OUT

OST TIME-OUT

TPWRT

TOST

INTERNAL RESET

FIGURE 5-7:

SLOW RISE TIME (MCLR TIED TO VDD)

Minimum VDD operating voltage

5V

VDD

0V

1V

MCLR

INTERNAL POR

TPWRT

PWRT TIME-OUT

TOST

OST TIME-OUT

INTERNAL RESET

DS30264A-page 24

Preliminary

© 1997 Microchip Technology Inc.

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