MC14490P

The MC14490P is a digital contact bounce eliminator constructed with complementary MOS enhancement mode devices. It is designed to eliminate extraneous level changes that occur when interfacing with mechanical contacts, providing a clean digital signal. The circuit generates a clean output signal approximately four clock periods after the input signal has stabilized, effectively removing bounce on both the make and break of a contact closure.

This device features diode protection on all inputs and internal pullups on all data inputs. It can be utilized as a digital integrator, system synchronizer, or delay line. The clock for operation can be derived from an internal R-C oscillator, which requires an external capacitor to adjust the operating frequency and bounce delay, or it can be driven from an external clock source. The MC14490P offers TTL compatible data inputs/outputs and a single line input that debounces both make and break contacts.

Available in PDIP-16 and SOIC-16 packages, the MC14490P operates over a supply voltage range of 3.0 V to 18 V and an ambient temperature range of -55 °C to +125 °C. Its maximum power dissipation is 500 mW per package.