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TC1232 Datasheet(PDF) 4 Page - Microchip Technology |
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TC1232 Datasheet(HTML) 4 Page - Microchip Technology |
4 / 20 page TC1232 DS21370C-page 4 Preliminary © 2005 Microchip Technology Inc. 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 20 — — ms Note 1 PB RST Falling Edge Low to Reset Active tPBD 14 20 ms PB RST Rising Edge High to Reset Inactive tRST 250 610 1000 ms ST Pulse Width tST 20 — — ns ST Time-out Period tTD 62.5 150 250 ms TD Pin = 0V 250 600 1000 ms TD Pin = Open 500 1200 2000 ms 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 ST 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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