Shortcode "Single Product Page Title". Please view Product after assigning Custom TemplateShortcode "Single Product Page Excerpt". Please view Product after assigning Custom Template


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 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

Connection Diagram

( PDIP or SOIC, top view )
ELM381 connection diagram

Block Diagram

ELM381 block diagram


The ELM381 data sheet (ver A, 31K):

pdf icon

Quantity Pricing

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.


Select the desired integrated circuit package type, then the quantity desired, before adding it to your shopping cart. Quantity discounts will be applied as appropriate.

Shortcode "Single Product Page Images". Please view Product after assigning Custom Template
Shortcode "Single Product Page Add To Cart". Please view Product after assigning Custom Template

Related Products

The following products may also be of interest to you: