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CD74HCT251E 데이터시트(PDF) 5 Page - Texas Instruments |
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CD74HCT251E 데이터시트(HTML) 5 Page - Texas Instruments |
5 / 7 page 5 Switching Specifications Input tr, tf = 6ns PARAMETER SYMBOL TEST CONDITIONS VCC (V) 25oC -40oC TO 85oC -55oC TO 125oC UNITS MIN TYP MAX MIN MAX MIN MAX HC TYPES Propagation Delay tPLH, tPHL CL = 50pF 2 - - 245 - 305 - 370 ns Select to Outputs 4.5 - - 49 - 61 - 74 ns CL =15pF 5 - 21 - - - - - ns CL = 50pF 6 - - 42 - 52 - 63 ns Data to Outputs tPLH, tPHL CL = 50pF 2 - - 175 - 220 - 265 ns 4.5 - - 35-44-53 ns CL =15pF 5 - 12 - - - - - ns CL = 50pF 6 - - 30 - 37 - 45 ns Enable to High Z and Enable from High Z tPLH, tPHL CL = 50pF 2 - - 140 - 175 - 210 ns 4.5 - - 28-35-42 ns CL =15pF 5 - 11 - - - - - ns CL = 50pF 6 - - 24 - 30 - 36 ns Output Transition Time tTLH, tTHL CL = 50pF 2 - - 75 - 95 - 110 ns 4.5 - - 15-19-22 ns 6 - -13-16-19 ns Input Capacitance CIN - - - - 10-10-10 pF Three-State Output Capacitance CO - - - - 15-15-15 pF Power Dissipation Capacitance (Notes 4, 5) CPD - 5 -60- - - - - pF HCT TYPES Propagation Delay tPLH, tPHL Select to Outputs CL = 50pF 4.5 - - 42 - 53 - 63 ns CL =15pF 5 - 18 - - - - ns Data to Outputs tPLH, tPHL CL = 50pF 4.5 - - 35 - 44 - 53 ns CL =15pF 5 - 12 - - - - - ns Enable to High Z and Enable from High Z tPLH, tPHL CL = 50pF 4.5 - 30 - 38 - 45 ns CL =15pF 5 - 12 - - - - - ns Output Transition Time tTLH, tTHL CL = 50pF 4.5 - - 15 - 19 - 22 ns Input Capacitance CIN - - - - 10-10-10 pF Power Dissipation Capacitance (Notes 4, 5) CPD - 5 60 ----- pF NOTES: 4. CPD is used to determine the dynamic power consumption, per package. 5. PD = VCC 2 f i (CPD + CL) where fi = input frequency, CL = output load capacitance, VCC = supply voltage. CD74HC251, CD74HCT251 |
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