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74HCT244 Arkusz danych(PDF) 11 Page - NXP Semiconductors |
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74HCT244 Arkusz danych(HTML) 11 Page - NXP Semiconductors |
11 / 22 page 74HC_HCT244_3 © Koninklijke Philips Electronics N.V. 2005. All rights reserved. Product data sheet Rev. 03 — 22 December 2005 11 of 22 Philips Semiconductors 74HC244; 74HCT244 Octal buffer/line driver; 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. Tamb = −40 °C to +125 °C tPHL, tPLH propagation delay nAn to nYn see Figure 6 VCC = 2.0 V - - 165 ns VCC = 4.5 V - - 33 ns VCC = 6.0 V - - 28 ns tPZH, tPZL 3-state output enable time nOE to nYn see Figure 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 nOE to nYn see Figure 7 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 6 VCC = 2.0 V - - 90 ns VCC = 4.5 V - - 18 ns VCC = 6.0 V - - 15 ns Table 9: Dynamic characteristics 74HC244 …continued GND = 0 V; tr =tf = 6 ns; CL = 50 pF unless otherwise specified; for test circuit see Figure 8. Symbol Parameter Conditions Min Typ Max Unit Table 10: Dynamic characteristics type 74HCT244 GND = 0 V; tr =tf = 6 ns; CL = 50 pF unless otherwise specified; for test circuit see Figure 8. Symbol Parameter Conditions Min Typ Max Unit Tamb = 25 °C tPHL, tPLH propagation delay nAn to nYn see Figure 6 VCC = 4.5 V - 13 22 ns VCC = 5 V; CL =15pF - 11 - ns tPZH, tPZL 3-state output enable time nOE to nYn VCC = 4.5 V; see Figure 7 - 1530ns tPHZ, tPLZ 3-state output disable time nOE to nYn VCC = 4.5 V; see Figure 7 - 1525ns tTHL, tTLH output transition time VCC = 4.5 V; see Figure 6 - 5 12 ns CPD power dissipation capacitance VI = GND to (VCC − 1.5 V) [1] -35 - pF |
Podobny numer części - 74HCT244 |
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Podobny opis - 74HCT244 |
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