ICM7217
Description
The ICM7217 is a four digit, presettable up/down counter with an onboard presettable register continuously pared to the counter. The ICM7217 is intended for use in hard-wired applications where thumbwheel switches are used for loading data, and simple SPDT switches are used for chip control. This circuit provides multiplexed 7 segment LED display outputs, with mon anode or mon cathode configurations available. Digit and segment drivers are provided to directly drive displays of up to 0.8 inch character height (mon anode) at a 25% duty cycle. The frequency of the onboard multiplex oscillator may be controlled with a single capacitor, or the oscillator may be allowed to free run. Leading zeros can be blanked. The data appearing at the 7 segment and BCD outputs is latched; the content of the counter is transferred into the latches under external control by means of the Store pin. The ICM7217 (mon anode) and ICM7217A (mon cathode) versions are decade counters, providing a...
