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MC14490P Datasheet(PDF) 6 Page - ON Semiconductor |
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MC14490P Datasheet(HTML) 6 Page - ON Semiconductor |
6 / 12 page MC14490 http://onsemi.com 6 Figure 4. Typical “Form A” Contact Debounce Circuit (Only One Debouncer Shown) 1/2 BIT DELAY OSCILLATOR AND TWO–PHASE CLOCK GENERATOR Cext OSCout OSCin “FORM A” CONTACT Ain 1 9 7 φ1 φ2 DATA SHIFT LOAD 4–BIT STATIC SHIFT REGISTER φ1 φ2 φ1 φ2 15 Aout +VDD PULLUP RESISTOR (INTERNAL) OPERATING CHARACTERISTICS The single most important characteristic of the MC14490 is that it works with a single signal lead as an input, making it directly compatible with mechanical contacts (Form A and B). The circuit has a built–in pullup resistor on each input. The worst case value of the pullup resistor (determined from the Electrical Characteristics table) is used to calculate the contact wetting current. If more contact current is required, an external resistor may be connected between VDD and the input. Because of the built–in pullup resistors, the inputs cannot be driven with a single standard CMOS gate when VDD is below 5 V. At this voltage, the input should be driven with paralleled standard gates or by the MC14049 or MC14050 buffers. The clock input circuit (pin 7) has Schmitt trigger shaping such that proper clocking will occur even with very slow clock edges, eliminating any need for clock preshaping. In addition, other MC14490 oscillator inputs can be driven from a single oscillator output buffered by an MC14050 (see Figure 5). Up to six MC14490s may be driven by a single buffer. The MC14490 is TTL compatible on both the inputs and the outputs. When VDD is at 4.5 V, the buffered outputs can sink 1.6 mA at 0.4 V. The inputs can be driven with TTL as a result of the internal input pullup resistors. Figure 5. Typical Single Oscillator Debounce System FROM CONTACTS MC14490 TO SYSTEM LOGIC OSCin OSCout Cext 1/6 MC14050 9 7 OSCin 7 9 OSCout NO CONNECTION FROM CONTACTS TO SYSTEM LOGIC MC14490 NO CONNECTION 9 OSCout OSCin 7 FROM CONTACTS MC14490 TO SYSTEM LOGIC |
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Similar Description - MC14490P |
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