Datasheet

PIC16C7X
DS30390E-page 228  1997 Microchip Technology Inc.
Applicable Devices 72 73 73A 74 74A 76 77
FIGURE 20-4: RESET, WATCHDOG TIMER, OSCILLATOR START-UP TIMER AND POWER-UP
TIMER TIMING
FIGURE 20-5: BROWN-OUT RESET TIMING
TABLE 20-4: RESET, WATCHDOG TIMER, OSCILLATOR START-UP TIMER, POWER-UP TIMER,
AND BROWN-OUT RESET REQUIREMENTS
Parameter
No.
Sym Characteristic Min Typ† Max Units Conditions
30 TmcL MCLR Pulse Width (low) 2 — — µsVDD = 5V, -40˚C to +125˚C
31* Twdt Watchdog Timer Time-out Period
(No Prescaler)
71833msVDD = 5V, -40˚C to +125˚C
32 Tost Oscillation Start-up Timer Period — 1024TOSC ——TOSC = OSC1 period
33* Tpwrt Power up Timer Period 28 72 132 ms VDD = 5V, -40˚C to +125˚C
34 TIOZ I/O Hi-impedance from MCLR Low
or Watchdog Timer Reset
— — 2.1 µs
35 TBOR Brown-out Reset pulse width 100 — — µsVDD ≤ BVDD (D005)
* These parameters are characterized but not tested.
† Data in "Typ" column is at 5V, 25˚C unless otherwise stated. These parameters are for design guidance only and are not
tested.
VDD
MCLR
Internal
POR
PWRT
Time-out
OSC
Time-out
Internal
RESET
Watchdog
Timer
RESET
33
32
30
31
34
I/O Pins
34
Note: Refer to Figure 20-1 for load conditions.
VDD
BVDD
35