PIC17C75X Datasheet, PDF (234/320 Pages) Microchip Technology – High-Performance 8-Bit CMOS EPROM Microcontrollers

PIC17C75X
FIGURE 20-4: RESET, WATCHDOG TIMER, OSCILLATOR START-UP TIMER, POWER-UP TIMER,
AND BROWN-OUT RESET TIMING
VDD
MCLR
Internal
POR / BOR
33
PWRT
Timeout
OSC ³²
Timeout
Internal
RESET
Watchdog
Timer
RESET
Address /
Data
30
31
35
TABLE 20-4: RESET, WATCHDOG TIMER, OSCILLATOR START-UP TIMER, POWER-UP TIMER,
AND BROWN-OUT RESET REQUIREMENTS
Param.
No.
Sym Characteristic
Min
Typ†
Max Units
Conditions
30
TmcL MCLR Pulse Width (low)
31
TWDT Watchdog Timer Time-out Period
(Prescale = 1)
32
TOST Oscillation Start-up Timer Period
33
TPWRT Power-up Timer Period
100 *
—
5*
12
—
ns VDD = 5V
25 * ms VDD = 5V
— 1024TOSC§ —
40 *
96
200 *
ms TOSC = OSC1 period
ms VDD = 5V
34
TIOZ MCLR to I/O hi-impedance
100 ‡
—
35
TmcL2adI MCLR to System Inter- ^PIC17CXXX
—
—
face bus (AD15:AD0>) _PIC17LCXXX
invalid
—
—
—
100 *
120 *
ns Depends on pin load
ns
ns
36
*
†
‡
§
TBOR Brown-out Reset Pulse Width (low)
100 *
—
—
ns 3.8V ≤ VDD ≤ 4.2V
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.
DS30264A-page 234
Preliminary
© 1997 Microchip Technology Inc.