PIC16LC74B-16 Datasheet, PDF (14/41 Pages) Microchip Technology – 8-Bit CMOS Microcontrollers with A/D Converter

PIC16LC74B-16/PTL16
FIGURE 2-5: RESET, WATCHDOG TIMER, OSCILLATOR START-UP TIMER AND POWER-UP
TIMER TIMING
VDD
MCLR
Internal
POR
PWRT
Time-out
OSC
Time-out
Internal
RESET
Watchdog
Timer
RESET
33
32
I/O Pins
Note: Refer to Figure 2-2 for load conditions.
30
34
31
34
FIGURE 2-6: BROWN-OUT RESET TIMING
VDD
BVDD
35
TABLE 2-4: RESET, WATCHDOG TIMER, OSCILLATOR START-UP TIMER, POWER-UP TIMER
AND BROWN-OUT RESET REQUIREMENTS
Parameter Sym
No.
Characteristic
Min
Typ†
Max Units
Conditions
30
TmcL MCLR Pulse Width (low)
2
—
—
µs VDD = 5V, -40°C to +125°C
31*
Twdt Watchdog Timer Time-out Period 7
18
33 ms VDD = 5V, -40°C to +125°C
(No Prescaler)
32
Tost
Oscillation Start-up Timer Period — 1024 TOSC —
— TOSC = OSC1 period
33*
Tpwrt Power-up Timer Period
28
72
132 ms VDD = 5V, -40°C to +125°C
34
TIOZ
I/O Hi-impedance from MCLR
—
—
2.1 µs
Low or WDT reset
35
TBOR Brown-out Reset Pulse Width
100
—
—
µs VDD ≤ BVDD (D005)
* These parameters are characterized but not tested.
† Data in "Typ" column is at 3V, 25°C unless otherwise stated. These parameters are for design guidance only and are not
tested.
DS30026A-page 14
Preliminary
© 1999 Microchip Technology Inc.