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74HCT238 Arkusz danych(PDF) 8 Page - NXP Semiconductors |
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74HCT238 Arkusz danych(HTML) 8 Page - NXP Semiconductors |
8 / 18 page 74HC_HCT238_3 © NXP B.V. 2007. All rights reserved. Product data sheet Rev. 03 — 16 July 2007 8 of 18 NXP Semiconductors 74HC238; 74HCT238 3-to-8 line decoder/demultiplexer [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 74HCT238 tpd propagation delay An to Yn; see Figure 6 [1] VCC = 4.5 V - 19 35 44 53 ns VCC = 5.0 V; CL =15pF - 18 - - - ns E3 to Yn; see Figure 6 [1] VCC = 4.5 V - 20 37 46 56 ns VCC = 5.0 V; CL =15pF - 20 - - - ns En to Yn or see Figure 7 [1] VCC = 4.5 V - 20 35 44 53 ns VCC = 5.0 V; CL =15pF - 21 - - - ns tt transition time VCC = 4.5 V; see Figure 6 and Figure 7 [2] - 7 15 19 22 ns CPD power dissipation capacitance per package; VI = GND to VCC − 1.5 V [3] -76- - - pF Table 7. Dynamic characteristics GND = 0 V; test circuit see Figure 8. Symbol Parameter Conditions 25 °C −40 °C to +125 °C Min Typ Max Max (85 °C) Max (125 °C) Unit Measurement points are given in Table 8. VOL and VOH are typical voltage output levels that occur with the output load. Fig 6. Input (An, E3) to output (Yn) propagation delays and output transition times 001aag757 An, E3 input Yn output tTHL tTLH VM VM VX VY tPHL tPLH |
Podobny numer części - 74HCT238 |
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Podobny opis - 74HCT238 |
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