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Ultralong_delay_timer_using_two_8240_16_pin_DIPs

2014-11-18 18:23  
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Ultralong_delay_timer_using_two_8240_16_pin_DIPs
Ultralong delay timer using two 8240 16-pin DIPs. The time base of unit 2 is disabled. The output is normally high when the system is reset. Upon application of a trigger the output goes low and stays that way for a duration of (256)2 or 65,536 cycles of the time base oscillator. Total timing cycle of the circuit is programmed from To = 256RC to To = 65,536RC in 256 discrete steps by selecting any combination of the counter outputs of unit2 (courtesy Intersil, Inc.).