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74HC245 Datasheet(PDF) 12 Page - NXP Semiconductors |
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74HC245 Datasheet(HTML) 12 Page - NXP Semiconductors |
12 / 22 page ![]() 9397 750 14502 © Koninklijke Philips Electronics N.V. 2005. All rights reserved. Product data sheet Rev. 03 — 31 January 2005 12 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; ∑ (C L × VCC 2 × f o) = sum of outputs. Table 10: Dynamic characteristics type 74HCT245 GND = 0 V; test circuit see Figure 7. Symbol Parameter Conditions Min Typ Max Unit Tamb = 25 °C tPHL, tPLH propagation delay An to Bn or Bn to An see Figure 5 VCC = 4.5 V - 12 22 ns VCC = 5.0 V; CL =15pF - 10 - ns tPZH, tPZL 3-state output enable time OE to An or OE to Bn VCC = 4.5 V; see Figure 6 - 1630ns tPHZ, tPLZ 3-state output disable time OE to An or OE to Bn VCC = 4.5 V; see Figure 6 - 1630ns tTHL, tTLH output transition time VCC = 4.5 V; see Figure 5 - 5 12 ns CPD power dissipation capacitance per transceiver VI = GND to VCC − 1.5 V [1] -30 - pF Tamb = −40 °C to +85 °C tPHL, tPLH propagation delay An to Bn or Bn to An VCC = 4.5 V; see Figure 5 --28 ns tPZH, tPZL 3-state output enable time OE to An or OE to Bn VCC = 4.5 V; see Figure 6 --38 ns tPHZ, tPLZ 3-state output disable time OE to An or OE to Bn VCC = 4.5 V; see Figure 6 --38 ns tTHL, tTLH output transition time VCC = 4.5 V; see Figure 5 --15 ns Tamb = −40 °C to +125 °C tPHL, tPLH propagation delay An to Bn or Bn to An VCC = 4.5 V; see Figure 5 --33 ns tPZH, tPZL 3-state output enable time OE to An or OE to Bn VCC = 4.5 V; see Figure 6 --45 ns tPHZ, tPLZ 3-state output disable time OE to An or OE to Bn VCC = 4.5 V; see Figure 6 --45 ns tTHL, tTLH output transition time VCC = 4.5 V; see Figure 5 --18 ns |
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