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74LV123D bảng dữ liệu(PDF) 10 Page - NXP Semiconductors |
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74LV123D bảng dữ liệu(HTML) 10 Page - NXP Semiconductors |
10 / 16 page Philips Semiconductors Product specification 74LV123 Dual retriggerable monostable multivibrator with reset 1998 Apr 28 10 0.8 0.4 0 02 4 VCC (V) ‘K’ factor SV00185 1 3 6 5 Figure 4. HCT typical “k” factor as a function of VCC; CX = 10 nF; RX = 10 KW to 100 KW. 0 1102 SV00141 10 103 104 102 103 104 105 106 tW ns CEXT (pF) REXT = 100k W 50k W 10k W 2k W Figure 5.Typical output pulse width as a function of the external capacitor values at VCC = 3.3V and Tamb = 25°C. APPLICATION INFORMATION Power-up considerations When the monostable is powered-up it may produce an output pulse, with a pulse width defined by the values of RX and CX. This output pulse can be eliminated using the circuit shown in Figure 6. SV00152 RX VCC A B CX Q Q RESET VCC nCEXT nREXT/CEXT “123” Figure 6. Power-up output pulse elimination circuit Power-down considerations A large capacitor (CX) may cause problems when powering-down the monostable due to the energy stored in this capacitor. When a system containing this device is powered-down or a rapid decrease of VCC to zero occurs, the monostable may sustain damage, due to the capacitor discharging through the input protection diodes. To avoid this possibility, connect a damping diode (DX) preferably a germanium or Schottky type diode able to withstand large current surges as shown in Figure 7. VCC DX RX CX nREXT/CEXT SV00154 Figure 7. Power-down protection circuit |
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