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UM708LS Datasheet(PDF) 3 Page - Union Semiconductor, Inc. |
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UM708LS Datasheet(HTML) 3 Page - Union Semiconductor, Inc. |
3 / 15 page ________________________________________________________________________ http://www.union-ic.com Rev.02 May.2014 3/15 UM706xS/UM708xS Pin Description Pin Number Pin Name Function 1 MR _______ Manual-Reset Input triggers a reset pulse when pulled below 0.8V. This active-low input has an internal 250μA pull-up current. It can be driven from a TTL or CMOS logic line as well as shorted to ground with a switch. 2 VCC Supply Input 3 GND Ground Reference for all signals. 4 PFI Power-Fail Voltage Monitor Input. When PFI is less than 1.25V, PFO ________ goes low. Connect PFI to GND or VCC when not used. 5 PFO ________ Power-Fail Output goes low and sinks current when PFI is less than 1.25V; otherwise PFO ________ stays high. 6 UM706 WDI Watchdog Input. If WDI remains either high or low for longer than the watchdog timeout period, the WDO __________ goes low. The timer resets with each transition at the WDI input. Either a high-to-low or a low-to-high transition clears the counter. The internal timer is also cleared whenever reset is asserted. UM708 NC No Connect 7 RESET ______________ Active-Low Reset Output pulses low for 200ms when trigged, and stays low whenever VCC is below the reset threshold. It remains low for 200ms after VCC rises above the reset threshold or MR _______ goes from Low to High. 8 UM706 WDO ___________ Watchdog Output pulls low when the internal watchdog 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 threshold, WDO ___________ goes high with no delay. UM708 RESET Active-High Reset Output is the inverse of RESET ____________ . Whenever RESET is high, RESET ____________ is low, and vice versa. |
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