ELM381数据手册ELM中文资料规格书

描述 Description

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.

特性 Features

·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

应用 Application

·Long term (daily or weekly) event timers
·Missing event detectors
·Automatic shutoff circuits