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データシートサーチシステム |
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MC14490DWR2G データシート(PDF) 4 Page - ON Semiconductor |
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MC14490DWR2G データシート(HTML) 4 Page - ON Semiconductor |
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4 / 11 page  MC14490 http://onsemi.com 4 SWITCHING CHARACTERISTICS (Note 3) (CL = 50 pF, TA = 25_C) Characteristic Symbol VDD Vdc Min Typ (Note 4) Max Unit Output Rise Time All Outputs tTLH 5.0 10 15 − − − 180 90 65 360 180 130 ns Output Fall Time Oscillator Output Debounce Outputs tTHL 5.0 10 15 − − − 100 50 40 200 100 80 ns tTHL 5.0 10 15 − − − 60 30 20 120 60 40 Propagation Delay Time Oscillator Input to Debounce Outputs tPHL 5.0 10 15 − − − 285 120 95 570 240 190 ns tPLH 5.0 10 15 − − − 370 160 120 740 320 240 Clock Frequency (50% Duly Cycle) (External Clock) fcl 5.0 10 15 − − − 2.8 6 9 1.4 3.0 4.5 MHz Setup Time (See Figure 1) tsu 5.0 10 15 100 80 60 50 40 30 − − − ns Maximum External Clock Input Rise and Fall Time Oscillator Input tr, tf 5.0 10 15 No Limit ns Oscillator Frequency OSCout Cext ≥ 100 pF* Note: These equations are intended to be a design guide. Laboratory experimentation may be required. Formulas are typically ± 15% of actual frequencies. fosc, typ 5.0 10 15 1.5 Cext (in mF) 4.5 Cext (in mF) 6.5 Cext (in mF) Hz 3. The formulas given are for the typical characteristics only at 25_C. 4. Data labelled “Typ” is not to be used for design purposes but is intended as an indication of the IC’s potential performance. *POWER−DOWN CONSIDERATIONS Large values of Cext may cause problems when powering down the MC14490 because of the amount of energy stored in the capacitor. When a system containing this device is powered down, the capacitor may discharge through the input protection diodes at Pin 7 or the parasitic diodes at Pin 9. Current through these internal diodes must be limited to 10 mA, therefore the turn−off time of the power supply must not be faster than t = (VDD − VSS) Cext/(10 mA). For example, If VDD − VSS = 15 V and Cext =1mF, the power supply must turn off no faster than t = (15 V) (1 mF)/10 mA = 1.5 ms. This is usually not a problem because power supplies are heavily filtered and cannot discharge at this rate. When a more rapid decrease of the power supply to zero volts occurs, the MC14490 may sustain damage. To avoid this possibility, use external clamping diodes, D1 and D2, connected as shown in Figure 2. Figure 1. Switching Waveforms Figure 2. Discharge Protection During Power Down OSCin Aout Aout OSCin Ain VDD 0 V VDD 0 V VDD 0 V 50% 90% 50% 10% tr tf tPHL 90% 10% 50% 50% tsu 50% D1 D2 Cext 9 7 OSCin OSCout MC14490 tPLH VDD VDD |
同様の部品番号 - MC14490DWR2G |
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同様の説明 - MC14490DWR2G |
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