PIC16F627A Datasheet, PDF (145/168 Pages) Microchip Technology – FLASH-Based 8-Bit CMOS Microcontrollers

PIC16F627A/628A/648A
TABLE 17-7: 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)
2000
TBD
—
TBD
—
TBD
ns VDD = 5V, -40°C to +85°C
ms Extended temperature
31
Twdt Watchdog Timer Time out 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
TBOR Brown-out Reset pulse width
100*
—
—
µs VDD ≤ VBOR (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.
FIGURE 17-8:
TIMER0 AND TIMER1 EXTERNAL CLOCK TIMINGS
RA4/T0CKI
40
41
42
RB6/T1OSO/T1CKI
TMR0 OR
TMR1
45
46
47
48
 2002 Microchip Technology Inc.
Preliminary
DS40044A-page 143