HEX CONTACT BOUNCE ELIMINATOR | MC14490 Hex Contact Bounce Eliminator 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 V to 18 V Chip Complexity 546 FETs or Equivalent Gates These are Pb-Free Devices http PDIP-16 P SUFFIX CASE 648 SOIC-16 DW SUFFIX CASE 751G SOEIAJ-16 F SUFFIX CASE 966 MARKING DIAGRAMS I6rii-Ii-Ii i 1-11-11-1 11 MC14490P o AWLYYWWG jWiJTinznjw Hmm 14490 AWLYYWWG O_ 1 u m m u isnnnnnnnn MC14490 o ALYWG 1 uuuuuuuu MAXIMUM RATINGS Voltages Referenced to VSS Parameter Symbol Value Unit DC Supply Voltage Range VDD - to V Input or Output Voltage Range DC or Transient Vin Vout - to VDD V Input Current DC or Transient per Pin Iin 10 mA Power Dissipation per Package Note 1 Pd 500 mW Ambient .