ELM381 Datasheet | ELM Electronics

Description The ELM381 is a digitally configurable, multistage counter circuit in a single 8 pin package. When connected to a 60Hz source, four time periods from one hour to one week are possible, as shown in Table 1 below. Although the circuit has been optimized for a 60Hz input frequency, it is capable of being operated over a very wide range of frequencies. Of particular interest is the ability to interface directly to very low frequencies with varying waveforms due to the use of a Schmitt trigger input circuit. The ELM381 provides two outputs - a standard 50% duty cycle divider output, and a momentarily pulsed output. The pulse output is useful for audibly or visually signalling the beginning of a time period, or as a trigger for other circuitry. Refer to the Example Applications section for two typical circuits. Applications - Long term (daily or weekly) event timers - Missing event detectors - Automatic shutoff circuits Features - Low power CMOS design - typically 1m A at 5V - Wide supply range - 3.0 to 5.5 volt operation - Digitally selectable delays - Schmitt trigger circuitry on the clock input - pletely static operation - Long term accuracy with line frequency clock - High current drive outputs - up to 25 m A - Reset input provided with a pullup resistor Connection Diagram PDIP and SOIC (top view) VDD 1 D1 2 D0 3 reset 4 8 VSS 7 Out 6 Pulse 5 Clock Block Diagram VDD Clock 5 VSS D1 2 D0 3 reset ELM381DSA Digital Counters Pulse Generator 7 Out 6 Pulse Setting D1...