Datasheet

 1997 Microchip Technology Inc. DS30390E-page 191

PIC16C7X

Applicable Devices 72 73 73A 74 74A 76 77

FIGURE 18-4: RESET, WATCHDOG TIMER, OSCILLATOR START-UP TIMER AND POWER-UP

TIMER TIMING

TABLE 18-4: RESET, WATCHDOG TIMER, OSCILLATOR START-UP TIMER AND POWER-UP

TIMER REQUIREMENTS

Parameter

No.

Sym Characteristic Min Typ† Max Units Conditions

30 TmcL MCLR Pulse Width (low) 100 — — ns VDD = 5V, -40˚C to +85˚C

31* Twdt Watchdog Timer Time-out Period

(No Prescaler)

71833msVDD = 5V, -40˚C to +85˚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 +85˚C

34 TIOZ I/O Hi-impedance from MCLR Low

or Watchdog Timer Reset

— — 100 ns

* 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

I/O Pins

Note: Refer to Figure 18-1 for load conditions.