The MC14490 is constructed with complementary MOS enhancement
mode devices, and is used for the elimination of extraneous level changes
that result when interfacing with mechanical contacts. The digital contact
bounce eliminator circuit takes an input signal from a bouncing contact
and generates a clean digital signal four clock periods after the input has
stabilized. The bounce eliminator circuit will remove bounce on both the
?make? and the ?break? of a contact closure. The clock for operation of
the MC14490 is derived from an internal R?C oscillator which requires
only an external capacitor to adjust for the desired operating frequency
(bounce delay). The clock may also be driven from an external clock
source or the oscillator of another MC14490 (see Figure 5).
NOTE: Immediately after powerup, the outputs of the MC14490 are in
indeterminate states.
Features
? Diode Protection on All Inputs
? Six Debouncers Per Package
? Internal Pullups on All Data Inputs
? Can Be Used as a Digital Integrator, System Synchronizer, or Delay Line
? Internal Oscillator (R?C), or External Clock Source
? TTL Compatible Data Inputs/Outputs
? Single Line Input, Debounces Both ?Make? and ?Break? Contacts
? Does Not Require ?Form C? (Single Pole Double Throw) Input Signal
? Cascadable for Longer Time Delays
? Schmitt Trigger on Clock Input (Pin 7)
? Supply Voltage Range = 3.0 V to 18 V
? Chip Complexity: 546 FETs or 136.5 Equivalent Gates
? Pb?Free Packages are Available*