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74AHC14 데이터시트(PDF) 6 Page - NXP Semiconductors |
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74AHC14 데이터시트(HTML) 6 Page - NXP Semiconductors |
6 / 16 page 74AHC_AHCT14_5 © NXP B.V. 2009. All rights reserved. Product data sheet Rev. 05 — 4 May 2009 6 of 16 NXP Semiconductors 74AHC14; 74AHCT14 Hex inverting Schmitt trigger 10. Dynamic characteristics [1] Typical values are measured at nominal supply voltage (VCC = 3.3 V and VCC = 5.0 V). [2] tpd is the same as tPLH and tPHL. [3] CPD is used to determine the dynamic power dissipation (PD in µW). PD =CPD × VCC2 × fi × N+ Σ(CL × VCC2 × fo) where: fi = input frequency in MHz; fo = output frequency in MHz; CL = output load capacitance in pF; VCC = supply voltage in V; N = number of inputs switching; Σ(C L × VCC 2 × f o) = sum of the outputs. Table 7. Dynamic characteristics Voltages are referenced to GND (ground = 0 V); for test circuit see Figure 7. Symbol Parameter Conditions 25 °C −40 °C to +85 °C −40 °C to +125 °C Unit Min Typ[1] Max Min Max Min Max 74AHC14 tpd propagation delay nA to nY; see Figure 6 [2] VCC = 3.0 V to 3.6 V CL = 15 pF - 4.3 12.8 1.0 15.0 1.0 16.0 ns CL = 50 pF - 5.8 16.3 1.0 18.0 1.0 20.5 ns VCC = 4.5 V to 5.5 V CL = 15 pF - 3.2 8.6 1.0 10.0 1.0 11.0 ns CL = 50 pF - 4.2 10.6 1.0 12.0 1.0 13.5 ns CPD power dissipation capacitance fi = 1 MHz; VI = GND to VCC [3] -10 - - - - - pF 74AHCT14 tpd propagation delay nA to nY; see Figure 6 [2] VCC = 4.5 V to 5.5 V CL = 15 pF - 4.0 7.0 1.0 8.0 1.0 9.0 ns CL = 50 pF - 5.4 8.0 1.0 9.0 1.0 10.0 ns CPD power dissipation capacitance fi = 1 MHz; VI = GND to VCC [3] -12 - - - - - pF |
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