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74HC27 Datasheet(PDF) 7 Page - NXP Semiconductors |
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74HC27 Datasheet(HTML) 7 Page - NXP Semiconductors |
7 / 16 page ![]() 74HC_HCT27_3 © NXP B.V. 2008. All rights reserved. Product data sheet Rev. 03 — 7 January 2008 7 of 16 NXP Semiconductors 74HC27; 74HCT27 Triple 3-input NOR gate [1] tpd is the same as tPHL and tPLH. [2] tt is the same as tTHL and tTLH. [3] CPD is used to determine the dynamic power dissipation (PD in µW): PD =CPD × VCC2 × fi × N+ ∑ (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; ∑ (C L × VCC 2 × f o) = sum of outputs. 11. Waveforms CPD power dissipation capacitance per package; VI = GND to VCC [3] -24- - - pF 74HCT27 tpd propagation delay nA, nB, nC to nY; see Figure 6 [1] VCC = 4.5 V - 12 21 26 32 ns VCC = 5.0 V; CL =15pF - 10 - - - ns tt transition time VCC = 4.5 V; see Figure 6 [2] - 7 15 19 22 ns CPD power dissipation capacitance per package; VI = GND to VCC − 1.5 V [3] -30- - - pF Table 7. Dynamic characteristics type 74HC27; 74HCT27 GND = 0 V; for load circuit see Figure 7. Symbol Parameter Conditions 25 °C −40 °C to +125 °C Unit Min Typ Max Max (85 °C) Max (125 °C) Measurement points are given in Table 8. VOL and VOH are typical voltage output drop that occur with the output load. Fig 6. Input (nA, nB, nC) to output (nY) propagation delays and output transition times 001aag761 nA, nB, nC input VI GND VOH VOL nY output tTHL tTLH VM VM VX VY tPHL tPLH Table 8. Measurement points Type Input Output VM VM VX VY 74HC27 0.5VCC 0.5VCC 0.1VCC 0.9VCC 74HCT27 1.3 V 1.3 V 0.1VCC 0.9VCC |
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