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74LVC244ABQ Fiches technique(PDF) 8 Page - NXP Semiconductors |
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74LVC244ABQ Fiches technique(HTML) 8 Page - NXP Semiconductors |
8 / 19 page 74LVC_LVCH244A All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved. Product data sheet Rev. 8 — 26 June 2013 8 of 19 NXP Semiconductors 74LVC244A; 74LVCH244A Octal buffer/line driver; 3-state 10. Dynamic characteristics [1] Typical values are measured at Tamb =25 C and VCC = 1.2 V, 1.8 V, 2.5 V, 2.7 V, and 3.3 V respectively. [2] tpd is the same as tPLH and tPHL. ten is the same as tPZL and tPZH. tdis is the same as tPLZ and tPHZ. [3] Skew between any two outputs of the same package switching in the same direction. This parameter is guaranteed by design. [4] CPD is used to determine the dynamic power dissipation (PD in W). 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 Volts N = number of inputs switching (C L VCC 2 f o) = sum of the outputs. Table 7. Dynamic characteristics Voltages are referenced to GND (ground = 0 V). For test circuit see Figure 8. Symbol Parameter Conditions 40 C to +85 C 40 C to +125 C Unit Min Typ[1] Max Min Max tpd propagation delay nAntonYn; see Figure 6 [2] VCC = 1.2 V - 17.0 - - - ns VCC = 1.65 V to 1.95 V 1.5 6.4 13.7 1.5 15.8 ns VCC = 2.3 V to 2.7 V 1.0 3.4 7.1 1.0 8.2 ns VCC = 2.7 V 1.5 3.4 6.9 1.5 9.0 ns VCC = 3.0 V to 3.6 V 1.5 2.9 5.9 1.5 7.5 ns ten enable time nOE to nYn; see Figure 7 [2] VCC = 1.2 V - 24.0 - - - ns VCC = 1.65 V to 1.95 V 1.5 7.0 17.3 1.5 20.0 ns VCC = 2.3 V to 2.7 V 1.5 3.9 9.5 1.5 11.0 ns VCC = 2.7 V 1.5 4.1 8.6 1.5 11.0 ns VCC = 3.0 V to 3.6 V 1.0 3.2 7.6 1.0 9.5 ns tdis disable time nOE to nYn; see Figure 7 [2] VCC = 1.2 V - 9.0 - - - ns VCC = 1.65 V to 1.95 V 2.2 4.5 9.8 2.2 11.3 ns VCC = 2.3 V to 2.7 V 0.5 3.6 5.5 0.5 6.4 ns VCC = 2.7 V 1.5 3.3 6.8 1.5 8.5 ns VCC = 3.0 V to 3.6 V 1.5 3.1 5.8 1.5 7.5 ns tsk(o) output skew time [3] -- 1.0 - 1.5 ns CPD power dissipation capacitance per input; VI =GND to VCC [4] VCC = 1.65 V to 1.95 V - 6.4 - - - pF VCC = 2.3 V to 2.7 V - 9.6 - - - pF VCC = 3.0 V to 3.6 V - 12.5 - - - pF |
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