PIC17C75X Datasheet, PDF (24/320 Pages) Microchip Technology – High-Performance 8-Bit CMOS EPROM Microcontrollers

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.