Datasheet

© 2007 Microchip Technology Inc. DS41250F-page 269
PIC16F913/914/916/917/946
TABLE 19-4: RESET, WATCHDOG TIMER, OSCILLATOR START-UP TIMER, POWER-UP TIMER
AND BROWN-OUT RESET PARAMETERS
Standard Operating Conditions (unless otherwise stated)
Operating Temperature -40°C ≤ T
A ≤ +125°C
Param
No.
Symbol Characteristic Min. Typ† Max. Units Conditions
30 T
MCLMCLR Pulse Width (low) 2
5
—
—
—
—
μs
μs
VDD = 5V, -40°C to +85°C
V
DD = 5V
31 TWDT Watchdog Timer Time-out
Period (No Prescaler)
10
10
16
16
29
31
ms
ms
VDD = 5V, -40°C to +85°C
V
DD = 5V
32 T
OST Oscillation Start-up Timer
Period
(1, 2)
— 1024 — TOSC (NOTE 3)
33* T
PWRT Power-up Timer Period 40 65 140 ms
34* T
IOZ I/O High-impedance from
MCLR
Low or Watchdog Timer
Reset
——2.0μs
35 V
BOR Brown-out Reset Voltage 2.0
2.0
—
—
2.2
2.25
V
V
-40°C to +85°C, (NOTE 4)
-40°C to +125°C, (NOTE 4)
36* V
HYST Brown-out Reset Hysteresis — 50 — mV
37* T
BOR Brown-out Reset Minimum
Detection Period
100 — — μsVDD ≤ VBOR
* 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.
Note 1: Instruction cycle period (T
CY) equals four times the input oscillator time base period. All specified values
are based on characterization data for that particular oscillator type under standard operating conditions
with the device executing code. Exceeding these specified limits may result in an unstable oscillator oper-
ation and/or higher than expected current consumption. All devices are tested to operate at “min” values
with an external clock applied to the OSC1 pin. When an external clock input is used, the “max” cycle time
limit is “DC” (no clock) for all devices.
2: By design.
3: Period of the slower clock.
4: To ensure these voltage tolerances, VDD and VSS must be capacitively decoupled as close to the device as
possible. 0.1 μF and 0.01 μF values in parallel are recommended.