PIC16F628-20P Datasheet, PDF (140/170 Pages) Microchip Technology – FLASH-Based 8-Bit CMOS Microcontroller

PIC16F62X
FIGURE 17-8:
VDD
MCLR
Internal
POR
PWRT
Timeout
OSC
Timeout
Internal
RESET
Watchdog
Timer
RESET
I/O Pins
RESET, WATCHDOG TIMER, OSCILLATOR START-UP TIMER AND POWER-UP
TIMER TIMING
30
33
32
31
34
34
FIGURE 17-9:
BROWN-OUT DETECT TIMING
VDD
VBOD
35
TABLE 17-6: RESET, WATCHDOG TIMER, OSCILLATOR START-UP TIMER AND POWER-UP
TIMER REQUIREMENTS
Param
No.
Sym
Characteristic
Min
Typ† Max Units
Conditions
30
TmcL MCLR Pulse Width (low)
2000
TBD
—
TBD
—
TBD
ns VDD = 5V, -40°C to +85°C
ms Extended temperature
31
Twdt Watchdog Timer Timeout Period
7
18
33
ms VDD = 5V, -40°C to +85°C
(No Prescaler)
TBD
TBD
TBD ms Extended temperature
32
Tost Oscillation Start-up Timer Period
—
1024TOSC —
— TOSC = OSC1 period
33*
Tpwrt Power-up Timer Period
28
TBD
72
TBD
132
TBD
ms VDD = 5V, -40°C to +85°C
ms Extended temperature
34
TIOZ I/O Hi-impedance from MCLR Low —
—
2.0
µs
or Watchdog Timer Reset
35
TBOD Brown-out Detect pulse width
100
—
—
µs VDD ≤ VBOD (D005)
* These parameters are characterized but not tested.
† Data in “Typ” column is at 5.0V, 25°C unless otherwise stated. These parameters are for design guidance only and are not
tested.
DS40300C-page 138
Preliminary
 2003 Microchip Technology Inc.