Datasheet > ELM626

ELM626

更新时间： 2024-11-26 04:17:19

品牌	Logo	应用领域
ELM		/
页数	文件大小	规格书
4页	30K
描述
RS232 Break Detector

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ELM626 数据手册

ELM626

RS232 Break Detector

Description

Features

The ELM626 is a complete circuit for detecting

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

• No external timing elements required

• Complementary outputs

break signals on RS232 lines, in an 8 pin package.

The circuit is similar to the ELM627 except that an

output pulse is not generated on power-up.

The threshold for break signal detection is user

selectable, allowing the circuit to respond to a

transmitted null character, <ctrl>@, at various baud

rates. This provides a convenient means for the

remote triggering of this circuit by simply shifting to a

lower baud rate and sending a null byte.

• Digitally controlled threshold timing

• Selectable output duration

• High current drive outputs - up to 25 mA

Two complementary high current outputs are

provided by the ELM626, so that further buffering is

not usually required. The output signal can be

selected to be either a continuous one (following the

TxD input line) or else a 100ms pulse output.

Connection Diagram

PDIP and SOIC

(top view)

No external components are required for circuit

operation other than possibly a current limiting

resistor, as all timing references are generated

internally.

VDD

VSS

Applications

P/C

TxD

• Remote resetting of RS232 devices

• Edge triggered one-shot circuits

• Digitally controlled sequencing schemes

• Watchdog type signal monitors

Block Diagram

TxD

Output

Logic

Programmable

Timer

P/C

ELM626DSA

Elm Electronics – Circuits for the Hobbyist

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