Datasheet > ELM381

ELM381

更新时间： 2024-01-06 17:30:29

品牌	Logo	应用领域
其他 - ETC		计数器
页数	文件大小	规格书
4页	34K
描述
60 Hz Long Interval Counter

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ELM381 数据手册

ELM381

60 Hz Long Interval Counter

Description

Features

The ELM381 is a digitally configurable, multi-

• Low power CMOS design - typically 1mA at 5V

• Wide supply range – 3.0 to 5.5 volt operation

• Digitally selectable delays

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.

• Schmitt trigger circuitry on the clock input

• Completely static operation

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.

• Long term accuracy with line frequency clock

• High current drive outputs – up to 25 mA

• Reset input provided with a pullup resistor

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.

Connection Diagram

PDIP and SOIC

(top view)

VDD

VSS

Applications

Out

• Long term (daily or weekly) event timers

• Missing event detectors

Pulse

Clock

reset

• Automatic shutoff circuits

Block Diagram

VDD

Clock

Out

VSS

Digital

Counters

Pulse

Generator

Pulse

Setting

Divisor

x 1000

Period

(60Hz)

216

2592

1 hour

12 hrs

24 hrs

7 days

VDD

reset

5184

36,288

Table 1

ELM381DSA

Elm Electronics – Circuits for the Hobbyist

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< http://www.elmelectronics.com/ >

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