PIC16F1946 datasheet(408/478 Pages) MICROCHIP

408 / 478 page

PIC16(L)F1946/47

DS41414D-page 408

 2010-2012 Microchip Technology Inc.

TABLE 30-5:

RESET, WATCHDOG TIMER, OSCILLATOR START-UP TIMER, POWER-UP TIMER

AND BROWN-OUT RESET PARAMETERS

FIGURE 30-10:

TIMER0 AND TIMER1 EXTERNAL CLOCK TIMINGS

Standard Operating Conditions (unless otherwise stated)

Operating Temperature -40°C

TA +125°C

Param

No.

Sym.

Characteristic

Min.

Typ† Max. Units

Conditions

TMCLMCLR Pulse Width (low)

—

s

TWDTLP Watchdog Timer Time-out Period

VDD = 3.3V-5V,

1:16 Prescaler used

TOST

Oscillator Start-up Timer Period(1)

—

1024

—

Tosc

33*

TPWRT

Power-up Timer Period, PWRTE = 0

140

34*

TIOZ

I/O high-impedance from MCLR Low

or Watchdog Timer Reset

——

2.0

s

VBOR

Brown-out Reset Voltage(2)

2.55

1.80

2.70

1.90

2.85

2.11

BORV = 0

BORV = 1

36*

VHYST

Brown-out Reset Hysteresis

-40°C to +85°C

37*

TBORDC Brown-out Reset DC Response

Time

sVDD  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:

By design, the Oscillator Start-up Timer (OST) counts the first 1024 cycles, independent of frequency.

To ensure these voltage tolerances, VDD and VSS must be capacitively decoupled as close to the device as

possible. 0.1

F and 0.01 F values in parallel are recommended.

T0CKI

T1CKI

TMR0 or

TMR1

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