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74HCT138PW-Q100 Arkusz danych(PDF) 9 Page - NXP Semiconductors |
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74HCT138PW-Q100 Arkusz danych(HTML) 9 Page - NXP Semiconductors |
9 / 18 page 74HC_HCT138_Q100 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved. Product data sheet Rev. 1 — 16 July 2012 9 of 18 NXP Semiconductors 74HC138-Q100; 74HCT138-Q100 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 W). 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. For type 74HCT138-Q100 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 = 50 pF; 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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