Datasheet > ELM440P

ELM440P

更新时间： 2024-10-30 04:17:19

品牌	Logo	应用领域
ELM		电机
页数	文件大小	规格书
4页	31K
描述
60Hz Generator

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中文翻译

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ELM440P 数据手册

ELM440

60Hz Generator

Description

Features

The ELM440 is an 8 pin digital divider integrated

• Low power CMOS design

circuit, that provides both 60Hz and 1Hz outputs

from a common 3.58MHz NTSC colourburst crystal.

• Wide supply range - 3.0 to 5.5 volt operation

• Generates both 60Hz and 1Hz references

Externally, the designer need only provide the

crystal and two appropriate loading capacitors, as

well as a suitably bypassed power supply. Internal

oscillator circuits then use this reference frequency

to precisely derive a stable 60Hz signal. This signal

is then further divided to provide a 1Hz output.

• Automatically synchronizes to the line frequency

for long term stability, when it’s available

• Uses a standard 3.58MHz crystal for the time

reference if there is no sync input

The ELM440 can also be locked in synchronism

to an external 60 or 120 Hz line frequency signal. If

derived from the electrical grid voltage, this results in

excellent long-term stability, as the power generation

frequency is traceable to national standards. The

transition to or from sync-lock with this external

signal occurs automatically.

• High current drive outputs - up to 25 mA

Connection Diagram

PDIP and SOIC

(top view)

A reset input is also provided to restart the

internal counters, if desired. An active low signal on

this pin will force both outputs to an open or tristate

condition.

VDD

VSS

XT1

XT2

60Hz

1Hz

Applications

• Stable 60Hz and 1Hz reference sources

• Master oscillator for clock / timekeeping functions

• DC powered backup 60Hz reference signal

sync

reset

Block Diagram

sync

60Hz

1Hz

Master

Oscillator

Divider

÷ 60

XT1

XT2

VDD

reset

ELM440DSB

Elm Electronics – Circuits for the Hobbyist

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