the-elm411-provides-all-of-the ELM Electronics, the-elm411-provides-all-of-the Datasheet

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the-elm411-provides-all-of-the

Manufacturer Part Number
the-elm411-provides-all-of-the
Description
Debounce Circuit With Latch
Manufacturer
ELM Electronics
Datasheet
1.THE-ELM411-PROVIDES-ALL-OF-THE.pdf (4 pages)
ELM411DSB
Description
Applications
Block Diagram
circuitry to connect as many as three independent
mechanical contacts to an electronic circuit.
relays, etc. will have inherent ‘bounce’ when they
make or break a connection. Depending on the type
of switch, this fluctuation can be quite pronounced,
often being interpreted as multiple inputs by high
speed digital circuits.
from most mechanical sources is provided by this
circuit, without the use of additional components. As
well, internal pull-up resistors have been provided so
that the switch inputs can be directly connected to
the 8 pin package.
inverters which follow the input directly, and one
latch circuit which toggles its state each time a
closed circuit is detected on the input.
• Pushbutton interface for logic circuits
• Limit switch monitoring
• Time delay generation
The ELM411 provides all of the necessary
All mechanical contacts, whether from switches,
All of the logic required to remove the bounce
The ELM411 is composed of two separate
Out1
Out2
In3
2
3
4
Elm Electronics – Circuits for the Hobbyist
V
DD
< http://www.elmelectronics.com/ >
Debounce
Debounce
Timers
Timers
Debounce
Timers
Debounce Circuit with Latch
Features
• Low power CMOS design - typically 1mA at 5V
• Wide supply range - 3.0 to 5.5 volt operation
• Simultaneous monitoring of three circuits
• Full 25msec debounce period on contact closure
• Internal pullup resistors for contact monitoring
• High current drive outputs - up to 25 mA
• Can be cascaded to provide sequential outputs
and opening, without external components
Flip-Flop
Toggle
V
V
DD
DD
Out1
Out2
V
In3
DD
Connection Diagram
PDIP and SOIC
1
2
3
4
(top view)
7
6
5
In1
In2
Out3
8
7
6
5
V
In1
In2
Out3
SS
ELM411
1 of 4

the-elm411-provides-all-of-the Summary of contents

Page 1

... As well, internal pull-up resistors have been provided so that the switch inputs can be directly connected to the 8 pin package. The ELM411 is composed of two separate inverters which follow the input directly, and one latch circuit which toggles its state each time a closed circuit is detected on the input ...

Page 2

... Plastic DIP............................... ELM411P All rights reserved. Copyright ©1999 Elm Electronics. Every effort is made to verify the accuracy of information provided in this document, but no representation or warranty can be given and no liability assumed by Elm Electronics with respect to the accuracy and/or use of any products or information described in this document ...

Page 3

... V DD Voltage on any other pin with respect to V ........................... -0. Electrical Characteristics All values are for operation at 25°C and a 5V supply, unless otherwise noted. For further information, refer to note 1 below. Characteristic Supply Voltage rate of rise DD Average Supply Current, I ...

Page 4

... Due to the latch action, a selected direction is maintained for subsequent step inputs, without any user intervention. The second debounce circuit has been used in this case to simply invert the level of Out3, providing a logic high level to the ELM310 at powerup. This has been done to ensure that the startup direction will be clockwise ...

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