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74VHC_VHCT126 데이터시트(PDF) 8 Page - NXP Semiconductors |
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74VHC_VHCT126 데이터시트(HTML) 8 Page - NXP Semiconductors |
8 / 15 page 74VHC_VHCT126_1 © NXP B.V. 2009. All rights reserved. Product data sheet Rev. 01 — 13 August 2009 8 of 15 NXP Semiconductors 74VHC126; 74VHCT126 Quad buffer/line driver; 3-state [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] ten is the same as tPZL and tPZH. [4] tdis is the same as tPLZ and tPHZ. [5] 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(CL × VCC2 × fo) = sum of the outputs. 11. Waveforms Measurement points are given in Table 8. VOL and VOH are typical voltage output levels that occur with the output load. Fig 6. Input to output propagation delays mna237 tPHL tPLH VM VM nA input nY output GND VI VOH VOL Measurement points are given in Table 8. VOL and VOH are typical voltage output levels that occur with the output load. Fig 7. Enable and disable times mna949 tPLZ tPHZ outputs disabled outputs enabled VY VX outputs enabled output LOW-to-OFF OFF-to-LOW output HIGH-to-OFF OFF-to-HIGH nOE input VOL VOH VCC VI VM GND GND tPZL tPZH VM VM |
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