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Ultralong_delay_timer_using_two_8250_16_pin_DIPs

2014-11-16 03:15  
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Ultralong_delay_timer_using_two_8250_16_pin_DIPs
Ultralong delay timer using two 8250 16-pin DIPs. The output is normally high when reset, and goes low upon application of a trigger input. It stays low for a duration of (100)2 or 10,000 cycles. Total timing cycle for the two 8250s can be programmed from TO = 1RC to TO = 9999RC in 10,000 discrete steps by selectively shorting any combination of pins 1 through 8 from both units to the output bus (courtesy Intersil, Inc.).