TC1232 datasheet(4/20 Pages) MICROCHIP

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TC1232

DS21370C-page 4

Preliminary

FIGURE 1-2:

Push Button Reset and Watchdog Timer Reset Timing Waveforms.

AC CHARACTERISTICS (CONTINUED)

Electrical Specifications: Unless otherwise noted, TA = TMIN to TMAX; VCC = +4.0V to 5.5V.

Parameters

Sym

Min

Typ

Max

Units

Conditions

PB RST Pulse Width

tPB

—

Note 1

PB RST Falling Edge Low to

Reset Active

tPBD

PB RST Rising Edge High to

Reset Inactive

tRST

250

610

1000

ST Pulse Width

tST

—

ST Time-out Period

tTD

62.5

150

250

TD Pin = 0V

250

600

1000

TD Pin = Open

500

1200

2000

TD Pin = VCC

Note 1:

PB RST must be held low for a minimum of 20 ms to ensure a reset.

RST

VIL

tPB

RST

tPBD

VIH

tRST

PB RST

The debounced PB RST input ignores input pulses less

than 1 ms and is designed to recognize pulses of

20 ms or greater.

tST

tTD

RST (when tTD ≤ tTD (min))

“H”

RST

(when tTD(min) ≤ tTD ≤ tTD(max))

(when tTD ≥ tTD(max))

RST

RST (when tTD ≤ tTD(min))

“L”

RST

(when tTD(min) ≤ tTD ≤ tTD(max))

(when tTD ≥ tTD(max))

RST

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