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74HC243N Datasheet(PDF) 9 Page - NXP Semiconductors |
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74HC243N Datasheet(HTML) 9 Page - NXP Semiconductors |
9 / 17 page 9397 750 13808 © Koninklijke Philips Electronics N.V. 2004. All rights reserved. Product data sheet Rev. 03 — 12 November 2004 9 of 17 Philips Semiconductors 74HC243 Quad bus transceiver; 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 OEA to An or Bn; OEB to An or Bn see Figure 6 and 7 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 OEA to An or Bn; OEB to An or Bn see Figure 6 and 7 VCC = 2.0 V - - 205 ns VCC = 4.5 V - - 41 ns VCC = 6.0 V - - 35 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; 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 OEA to An or Bn; OEB to An or Bn see Figure 6 and 7 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 OEA to An or Bn; OEB to An or Bn see Figure 6 and 7 VCC = 2.0 V - - 250 ns VCC = 4.5 V - - 50 ns VCC = 6.0 V - - 43 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 8: Dynamic characteristics …continued GND = 0 V; tr =tf = 6 ns; CL = 50 pF; RL = 1000 Ω; see Figure 8. Symbol Parameter Conditions Min Typ Max Unit |
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