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ELM409

ELM
Part Number ELM409
Manufacturer ELM
Description Versatile Debounce Circuit
Published Dec 20, 2013
Detailed Description ELM409 Versatile Debounce Circuit Description The ELM409 is digital filter circuit that is used to interface mechanical ...
Datasheet PDF File ELM409 PDF File

ELM409
ELM409

Overview
ELM409 Versatile Debounce Circuit Description The ELM409 is digital filter circuit that is used to interface mechanical contacts to electronic circuits.
All mechanical contacts, whether from switches, relays, etc.
will have inherent ‘bounce’ when they make or break a connection.
When that contact is used for the electrical input to a digital circuit, the bounces can easily be incorrectly interpreted as multiple inputs.
The ELM409 contains all of the logic that is typically required to remove the bounce from such signals, and provide a signal that has only one transition.
In addition to providing the standard debounce function, the ELM409 may also be configured for other useful functions such as generating pulses or alternating output levels on signal transitions.
No external components are needed for the operation of the ELM409, as all timing and logic functions are performed internally.
Features • • • • • • • Standard and extra long debounce times Schmitt input provides hysteresis Complementary circuit outputs Needs no external timing components Low power CMOS design - typically 1 mA at 5V Wide supply range - 3.
0 to 5.
5 volt operation High current drive outputs Connection Diagram PDIP and SOIC (top view) VDD 1 2 3 4 8 7 6 5 VSS Out Out In Applications • • • • Pushbutton interface for logic circuits Limit switch monitoring Time delay generation Power on sequencing A B C Block Diagram A 2 B 3 C 4 Control Logic edge detectors pulse generator 500 msec debounce In 5 7 Out Out 6 25 msec debounce edge detectors toggle circuit ELM409DSA Elm Electronics – Circuits for the Hobbyist < http://www.
elmelectronics.
com/ > 1 of 8 Free Datasheet http://www.
datasheet4u.
com/ ELM409 Pin Descriptions VDD (pin 1) This pin is the positive supply pin, and should always be the most positive point in the circuit.
Internal circuitry connected to this pin is used to provide power-on reset of the microprocessor, so an external reset signal is not required.
Refer to the ...


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