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74HCT245BQ 데이터시트(PDF) 11 Page - NXP Semiconductors |
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74HCT245BQ 데이터시트(HTML) 11 Page - NXP Semiconductors |
11 / 22 page 9397 750 14502 © Koninklijke Philips Electronics N.V. 2005. All rights reserved. Product data sheet Rev. 03 — 31 January 2005 11 of 22 Philips Semiconductors 74HC245; 74HCT245 Octal bus tranceiver; 3-state [1] 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; ∑ (CL × VCC2 × fo) = sum of outputs. tPZH, tPZL 3-state output enable time OE to An or OE to Bn see Figure 6 VCC = 2.0 V - - 190 ns VCC = 4.5 V - - 38 ns VCC = 6.0 V - - 33 ns tPHZ, tPLZ 3-state output disable time OE to An or OE to Bn see Figure 6 VCC = 2.0 V - - 190 ns VCC = 4.5 V - - 38 ns VCC = 6.0 V - - 33 ns tTHL, tTLH output transition time see Figure 5 VCC = 2.0 V - - 75 ns VCC = 4.5 V - - 15 ns VCC = 6.0 V - - 13 ns Tamb = −40 °C to +125 °C tPHL, tPLH propagation delay An to Bn or Bn to An see Figure 5 VCC = 2.0 V - - 135 ns VCC = 4.5 V - - 27 ns VCC = 6.0 V - - 23 ns tPZH, tPZL 3-state output enable time OE to An or OE to Bn see Figure 6 VCC = 2.0 V - - 225 ns VCC = 4.5 V - - 45 ns VCC = 6.0 V - - 38 ns tPHZ, tPLZ 3-state output disable time OE to An or OE to Bn see Figure 6 VCC = 2.0 V - - 225 ns VCC = 4.5 V - - 45 ns VCC = 6.0 V - - 38 ns tTHL, tTLH output transition time see Figure 5 VCC = 2.0 V - - 90 ns VCC = 4.5 V - - 18 ns VCC = 6.0 V - - 15 ns Table 9: Dynamic characteristics type 74HC245 …continued GND = 0 V; test circuit see Figure 7. Symbol Parameter Conditions Min Typ Max Unit |
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