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74HCT138 데이터시트(PDF) 8 Page - NXP Semiconductors |
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74HCT138 데이터시트(HTML) 8 Page - NXP Semiconductors |
8 / 19 page 74HC_HCT138 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved. Product data sheet Rev. 4 — 27 June 2012 8 of 19 NXP Semiconductors 74HC138; 74HCT138 3-to-8 line decoder/demultiplexer; inverting [1] tpd is the same as tPLH and tPHL. [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 × VCC2 × fo) = sum of outputs. For type 74HCT138 tpd propagation delay An to Yn; see Figure 6 [1] VCC = 4.5 V - 20 35 - 44 - 53 ns VCC =5V; CL =15pF - 17 - - - - - ns E3 to Yn; see Figure 6 [1] VCC = 4.5 V - 18 40 - 50 - 60 ns VCC =5V; CL =15pF - 19 - - - - - ns Ento Yn; see Figure 7 [1] VCC = 4.5 V - 19 40 - 50 - 60 ns VCC =5V; CL =15pF - 19 - - - - - ns tt transition time Yn; see Figure 6 and Figure 7 [2] VCC = 4.5 V - 7 15 - 19 - 22 ns CPD power dissipation capacitance CL =50pF;f= 1 MHz; VI =GND to VCC [3] -67 - - - - - pF Table 7. Dynamic characteristics …continued Voltages are referenced to GND (ground = 0 V); CL = 50 pF unless otherwise specified; for test circuit see Figure 8. Symbol Parameter Conditions Tamb = 25 °C Tamb = −40 °C to +85 °C Tamb = −40 °C to +125 °C Unit Min Typ Max Min Max Min Max |
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