Datasheet

© 2007 Microchip Technology Inc. Preliminary DS70165E-page 321
dsPIC33F
TABLE 26-20: RESET, WATCHDOG TIMER, OSCILLATOR START-UP TIMER, POWER-UP TIMER
AND BROWN-OUT RESET TIMING REQUIREMENTS
AC CHARACTERISTICS
Standard Operating Conditions: 3.0V to 3.6V
(unless otherwise stated)
Operating temperature -40°C ≤ TA ≤ +85°C
Param
No.
Symbol Characteristic
(1)
Min Typ
(2)
Max Units Conditions
SY10 T
MCLMCLR Pulse Width (low) 2 — — μs -40°C to +85°C
SY11 TPWRT Power-up Timer Period 0.75
1.5
3
6
12
24
48
96
1
2
4
8
16
32
64
128
1.25
2.5
5
10
20
40
80
160
ms -40°C to +85°C
User programmable
SY12 T
POR Power-on Reset Delay 3 10 30 μs -40°C to +85°C
SY13 T
IOZ I/O High-Impedance from MCLR
Low or Watchdog Timer Reset
—0.81.0μs
SY20 T
WDT1 Watchdog Timer Time-out Period
(No Prescaler)
1.8 2.0 2.2 ms VDD = 5V, -40°C to +85°C
T
WDT2 1.9 2.1 2.3 ms VDD = 3V, -40°C to +85°C
SY30 TOST Oscillator Start-up Timer Period — 1024 TOSC ——TOSC = OSC1 period
SY35 T
FSCM Fail-Safe Clock Monitor Delay — 500 900 μs -40°C to +85°C
Note 1: These parameters are characterized but not tested in manufacturing.
2: Data in “Typ” column is at 5V, 25°C unless otherwise stated.
3: Characterized by design but not tested.