Datasheet

PIC14000
DS40122B-page 114 Preliminary  1996 Microchip Technology Inc.
FIGURE 13-4: RESET, WATCHDOG TIMER, OSCILLATOR START-UP TIMER (HS MODE) AND
POWER-UP TIMER TIMING
TABLE 13-3: 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
T
WDT Watchdog Timer Timeout Period
(No Prescaler)
7* 18 33* ms VDD = 5V, -40°C to +85°C
ss(
WDT) Supply Sensitivity — -12.6 — %/V TA = 25°C
tc(
WDT) Temperature Coefficient — 0.5 — %/°C VDD = 5V
32
T
OST Oscillation Start-up Timer Period 1024 TOSC
8 TOSC
ms
ms
TOSC = OSC1 period
IN osc mode
33
T
PWRT Power up Timer Period 28* 72 132* ms VDD = 5V, -40°C to +85°C
34
T
IOZ I/O High Impedance from MCLR
Low
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.
32
Watchdog
Timer
RESET
PWRT
Timeout
MCLR
V
DD
33
Internal
POR
OSC
Timeout
Internal
RESET
31
30
I/O Pin
34
Note: Refer to Figure 13-2 for load conditions