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ELM404 - Rotary Decoder

General Description

The ELM404 is an 8 pin integrated circuit that is used to convert the output from a rotary encoder into three signals (chip select, clock and up/down) that can be used to control various devices.

The low power CMOS technology used ensures that only a very small current is required over the entire 2.

Key Features

  • Low power CMOS design Wide supply range.
  • 2.0 to 5.5 volts Complete debouncing of the encoder inputs No external filtering needed 2x decoding Startup delay timer High current drive outputs Connection Diagram PDIP and SOIC (top view) VDD A 1 2 3 4 8 7 6 5 VSS CS Clk U/D.

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Datasheet Details

Part number ELM404
Manufacturer ELM
File Size 74.45 KB
Description Rotary Decoder
Datasheet download datasheet ELM404 Datasheet

Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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ELM404 Rotary Decoder - 3 wire 2x Interface Description The ELM404 is an 8 pin integrated circuit that is used to convert the output from a rotary encoder into three signals (chip select, clock and up/down) that can be used to control various devices. The low power CMOS technology used ensures that only a very small current is required over the entire 2.0 to 5.5 volt operating range. There is no need for external filtering or debounce circuits with the ELM404, as this is all performed within the integrated circuit. After debouncing the encoder signals, the ELM404 determines the direction of shaft rotation, and then generates the appropriate outputs. The polarity of the clock output can be changed at any time to accommodate different needs.