Datasheet

PIC16F72X/PIC16LF72X
DS41341E-page 228 © 2009 Microchip Technology Inc.
TABLE 23-4: 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.
Sym. Characteristic Min. Typ† Max. Units Conditions
30 TMCLMCLR Pulse Width (low) 2
5
—
—
—
—
μs
μs
VDD = 3.3-5V, -40°C to +85°C
V
DD = 3.3-5V
31 TWDTLP Low Power Watchdog Timer Time-
out Period (No Prescaler)
10 18 27 ms VDD = 3.3V-5V
32 T
OST Oscillator Start-up Timer Period
(1),
(2)
— 1024 — Tosc (Note 3)
33* T
PWRT Power-up Timer Period, PWRTE = 0 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 2.38
1.80
2.5
1.9
2.73
2.11
VBORV=2.5V
BORV=1.9V
36* V
HYST Brown-out Reset Hysteresis 0 25 50 mV -40°C to +85°C
37* TBORDC Brown-out Reset DC Response
Time
135
10
μsVDD ≤ VBOR, -40°C to +85°C
V
DD ≤ VBOR
* These parameters are characterized but not tested.
† Data in “Typ” column is at 3.0V, 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 operation 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, V
DD 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.