PIC17C7XX Datasheet, PDF (249/328 Pages) Microchip Technology – High-Performance 8-Bit CMOS EPROM Microcontrollers with 10-bit A/D

PIC17C7XX
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
Time-out
OSC ³²
Time-out
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
(Postscale = 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§ —
ms TOSC = OSC1 period
40 *
96
200 * ms VDD = 5V
34
TIOZ MCLR to I/O hi-impedance
100 ‡
—
—
ns Depends on pin load
35 TmcL2adI MCLR to System
PIC17C7XX
—
Interface bus
PIC17LC7XX
(AD15:AD0>) invalid
—
—
100 * ns
—
120 * ns
36
TBOR Brown-out Reset Pulse Width (low)
100 *
—
—
ns 3.9V ≤ 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.
© 1998 Microchip Technology Inc.
Preliminary
DS30289A-page 249