60Hz Long Interval Counter
The following are the unit prices, as you vary the quantity purchased:
All prices are in Canadian dollars. We use the total number purchased (ELM381P + ELM381SM) for the calculation.
The ELM381 is a digitally configurable, multi- stage 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 of the data sheet for two typical circuits.
- Long term (daily or weekly) event timers
- Missing event detectors
- Automatic shutoff circuits
- Low power CMOS design – typically 1mA at 5V
- Wide supply range – 3.0 to 5.5 volt operation
- Digitally selectable delays
- Schmitt trigger circuitry on the clock input
- Completely static operation
- Long term accuracy with line frequency clock
- High current drive outputs – up to 25 mA
- Reset input provided with a pullup resistor
( PDIP or SOIC, top view )