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74AHCT3G14DC bảng dữ liệu(PDF) 7 Page - NXP Semiconductors |
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7 / 16 page 74AHC_AHCT3G14_4 © NXP B.V. 2009. All rights reserved. Product data sheet Rev. 04 — 5 May 2009 7 of 16 NXP Semiconductors 74AHC3G14; 74AHCT3G14 Inverting Schmitt trigger [1] tpd is the same as tPLH and tPHL. [2] Typical values are measured at VCC = 3.3 V. [3] Typical values are measured at VCC = 5.0 V. [4] CPD is used to determine the dynamic power dissipation PD (µW). PD =CPD × VCC2 × fi + 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; Σ(C L × VCC 2 × f o) = sum of the outputs. 13. Waveforms 74AHCT3G14 tpd propagation delay nA to nY; VCC = 4.5 V to 5.5 V [1] [3] CL = 15 pF - 4.1 7.0 1.0 8.0 1.0 9.0 ns CL = 50 pF - 5.9 8.5 1.0 10.0 1.0 11.0 ns CPD power dissipation capacitance per buffer; CL = 50 pF; fi = 1 MHz; VI = GND to VCC [4] -12- - - - - pF Table 9. Dynamic characteristics …continued GND = 0 V; tr = tf ≤ 3.0 ns; for test circuit see Figure 7. Symbol Parameter Conditions 25 °C −40 °C to +85 °C −40 °C to +125 °C Unit Min Typ Max Min Max Min Max The test data is given in Table 10 Test data is given in Table 10. Definitions for test circuit: CL = Load capacitance. RT = Termination resistance should be equal to output impedance Zo of the pulse generator. Fig 6. The input (nA) to output (nY) propagation delays Fig 7. Load circuit for measuring switching times mna033 A input Y output tPHL tPLH VM VM mna101 VCC VI VO RT CL PULSE GENERATOR DUT Table 10. Test data Type number Input Output VI VM VM 74AHC3G14 GND to VCC 0.5 × VCC 0.5 × VCC 74AHCT3G14 GND to 3.0 V 1.5 V 0.5 × VCC |
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