Precision_elapsed_time_countdown_timers_using_an_Intersil_ICM7217B_28_pin_DIP

Published:2009/7/21 23:54:00 Author:Jessie | From:SeekIC

Precision elapsed time/countdown timers using an Intersil ICM7217B 28-pin DIP. This circuit also uses an ICM7213 precision 1-minute/1-second time-base generator to provide a 4.1943 MHz crystal oscillator and divider, generating pulses counted by the ICM7217B, which is a 5959-maximum-count device. The thumbwheel switches allow a starting time to be entered into the counter for a preset countdown type timer, and allow the register to be set for compare functions. For instance, to make a 24-hour clock with BCD output the register can be reset with 2400 and the equals output used to reset the counter (courtesy Intersil, Inc.).



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Electrical_Equipment_Circuit/Precision_elapsed_time_countdown_timers_using_an_Intersil_ICM7217B_28_pin_DIP.html

Print this Page | Comments | Reading(3)