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MAX813L Datasheet(PDF) 5 Page - Maxim Integrated Products |
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MAX813L Datasheet(HTML) 5 Page - Maxim Integrated Products |
5 / 12 page Low-Cost, µP Supervisory Circuits _______________________________________________________________________________________ 5 ______________________________________________________________Pin Description Watchdog Output pulls low when the internal watch- dog timer finishes its 1.6sec count and does not go high again until the watchdog is cleared. WDO also goes low during low-line conditions. Whenever VCC is below the reset threshold, WDO stays low; however, unlike RESET, WDO does not have a minimum pulse width. As soon as VCC rises above the reset thresh- old, WDO goes high with no delay. Active-High Reset Output is the inverse of RESET. Whenever RESET is high, RESET is low, and vice versa (Figure 2). The MAX813L has a RESET output only. Active-Low Reset Output pulses low for 200ms when triggered, and stays low whenever VCC is below the reset threshold (4.65V in the MAX705 and 4.40V in the MAX706). It remains low for 200ms after VCC rises above the reset threshold or MR goes from low to high (Figure 3). A watchdog timeout will not trigger RESET unless WDO is connected to MR. Watchdog Input. If WDI remains high or low for 1.6sec, the internal watchdog timer runs out and WDO goes low (Figure 1). Floating WDI or connect- ing WDI to a high-impedance three-state buffer dis- ables the watchdog feature. The internal watchdog timer clears whenever reset is asserted, WDI is three- stated, or WDI sees a rising or falling edge. Power-Fail Output goes low and sinks current when PFI is less than 1.25V; otherwise PFO stays high. Power-Fail Voltage Monitor Input. When PFI is less than 1.25V, PFO goes low. Connect PFI to GND or VCC when not used. FUNCTION MAX705/MAX706 RESET 7 8 — WDO 8 — 8 RESET — 7 7 No Connect N.C. — 6 — WDI 6 — 6 PFO 5 5 5 PFI 4 4 4 0V Ground Reference for all signals GND 3 3 3 +5V Supply Input VCC 2 2 2 NAME DIP/SO DIP/SO DIP/SO MAX707/MAX708 PIN — 2 1 — 8 7 6 5 4 µMAX 2 — 1 — — 7 6 5 4 µMAX 1 2 — — 8 7 6 5 4 µMAX MAX813L Manual-Reset Input triggers a reset pulse when pulled below 0.8V. This active-low input has an inter- nal 250µA pull-up current. It can be driven from a TTL or CMOS logic line as well as shorted to ground with a switch. MR 1 1 1 3 3 3 |
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