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74HCT4851PW bảng dữ liệu(PDF) 11 Page - NXP Semiconductors |
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11 / 20 page 74HC_HCT4851_2 © NXP B.V. 2008. All rights reserved. Product data sheet Rev. 02 — 2 September 2008 11 of 20 NXP Semiconductors 74HC4851; 74HCT4851 8-channel analog MUX/DEMUX with injection-current effect control [1] tpd is the same as tPLH and tPHL. [2] ten is the same as tPZH and tPZL. [3] tdis is the same as tPLZ and tPHZ. [4] CPD is used to determine the dynamic power dissipation (PD in µW): PD =CPD × VCC2 × fi + ∑{(CL +Csw) × VCC2 × fo} where: fi = input frequency in MHz; fo = output frequency in MHz; ∑{(C L +Csw) × VCC 2 × f o} = sum of outputs; CL = output load capacitance in pF; Csw = switch capacitance in pF; VCC = supply voltage in V. 12. Waveforms 74HCT4851 tpd propagation delay Z, Yn to Yn, Z; see Figure 10 [1] VCC = 4.5 V 1.6 3.7 11.5 1.1 12.5 1.1 13.5 ns Sn to Z, Yn; see Figure 11 [1] VCC = 4.5 V 3.2 8.0 13 2.3 15 2.3 17 ns ten enable time E to Z, Yn; see Figure 12 [2] VCC = 4.5 V 4.2 8.6 25 3.0 30 3.0 35 ns tdis disable time EtoZ,Yn; see Figure 12 [3] VCC = 4.5 V 28.5 64.7 80 28.2 90 28 100 ns CPD power dissipation capacitance per channel; see Figure 13 [4] VCC = 5.0 V - 30 - - - - - pF Table 9. Dynamic characteristics …continued At recommended operating conditions; voltages are referenced to GND (ground 0 V); for load circuit see Figure 14. Symbol Parameter Conditions 25 °C −40 °C to +85 °C −40 °C to +125 °C Unit Min Typ Max Min Max Min Max Fig 10. Input (Z, Yn) to output (Yn, Z) propagation delays 001aah574 VCC Z or Yn input Yn or Z output tPLH 0.5VCC 0.5VCC tPHL GND VCC GND |
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