Datasheet

PIC17C4X
DS30412C-page 186  1996 Microchip Technology Inc.
Applicable Devices 42 R42 42A 43 R43 44
FIGURE 19-4: RESET, WATCHDOG TIMER, OSCILLATOR START-UP TIMER, AND POWER-UP
TIMER TIMING
TABLE 19-4: 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
31 Twdt Watchdog Timer Time-out Period
(Prescale = 1)
5 * 12 25 * ms
VDD = 5V
32 Tost Oscillation Start-up Timer Period — 1024T
OSC§ — ms TOSC = OSC1 period
33 Tpwrt Power-up Timer Period 40 * 96 200 * ms
VDD = 5V
35 TmcL2adI MCLR
to System Inter-
face bus (AD15:AD0>)
invalid
PIC17CR42/42A/
43/R43/44
— — 100 * ns
PIC17LCR42/
42A/43/R43/44
— — 120 * 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.
‡ These parameters are for design guidance only and are not tested, nor characterized.
§ This specification ensured by design.
VDD
MCLR
Internal
POR
PWRT
Timeout
OSC
Timeout
Internal
RESET
Watchdog
Timer
RESET
33
32
30
31
Address /
Data
35