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74HC_HCT240 データシート(PDF) 8 Page - NXP Semiconductors |
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74HC_HCT240 データシート(HTML) 8 Page - NXP Semiconductors |
8 / 18 page 74HC_HCT240_3 © NXP B.V. 2007. All rights reserved. Product data sheet Rev. 03 — 2 August 2007 8 of 18 NXP Semiconductors 74HC240; 74HCT240 Octal buffer/line driver; 3-state; inverting [1] tpd is the same as tPHL and tPLH. [2] ten is the same as tPZH and tPZL. [3] tdis is the same as tPHZ and tPLZ. [4] tt is the same as tTHL and tTLH. [5] 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 74HCT240 tpd propagation delay nAn to nYn; see Figure 6 [1] VCC = 4.5 V - 11 20 25 30 ns VCC = 5.0 V; CL =15pF - 9 - - - ns ten enable time nOE to nYn; VCC = 4.5 V; see Figure 7 [2] -13 3038 45 ns tdis disable time nOE to nYn; VCC = 4.5 V; see Figure 7 [3] -13 2531 38 ns tt transition time VCC = 4.5 V; see Figure 6 [4] - 5 12 15 18 ns CPD power dissipation capacitance per transceiver; VI = GND to VCC − 1.5 V [5] -30- - - pF Table 7. Dynamic characteristics …continued GND = 0 V; for load circuit see Figure 8. 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 (nAn) to output (nYn) propagation delays and output transition times mgu781 nAn input nYn output tPHL tPLH GND VI VM VM VM VM VOH VOL |
同様の部品番号 - 74HC_HCT240_15 |
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同様の説明 - 74HC_HCT240_15 |
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