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74ACT244M データシート(PDF) 4 Page - STMicroelectronics |
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74ACT244M データシート(HTML) 4 Page - STMicroelectronics |
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4 / 9 page ![]() TEST CIRCUIT T EST SW IT CH tPLH,tPHL Open tPZL,tPLZ 2VCC tPZH,tPHZ Open CL = 50 pF or equivalent (includes jigand probe capacitance) RL =R1 =500 Ω orequivalent RT =ZOUT of pulse generator (typically 50 Ω) CAPACITIVE CHARACTERISTICS Symb ol Parameter Test Co nditi ons Valu e Un it VCC (V) TA =25 oC -40 to 85 oC Min. T yp. Max. Mi n. Max. CIN Input Capacitance 5.0 4 pF Ci/o I/O Capacitance 5.0 8 pF CPD Power Dissipation Capacitance (note 1) 5.0 24 pF 1) CPD isdefined as the value of the IC’sinternal equivalent capacitance which is calculated fromthe operating current consumption without load. (Referto Test Circuit).Average operating current can be obtained by the following equation. ICC(opr) = CPD • VCC • fIN +ICC/n (per circuit) AC ELECTRICAL CHARACTERISTICS (CL = 50 pF, RL = 500 Ω, Input tr =tf =3 ns) Symb ol Parameter T est Con ditio n Valu e Un it VCC (V) TA =25 oC -40 to 85 oC Min. T yp. Max. Mi n. Max. tPLH tPHL Propagation Delay Time 5.0 (*) 1.5 4.5 9.0 1.5 10.0 ns tPZL tPZH Output Enable Time 5.0 (*) 1.5 5.5 9.0 1.5 10.0 ns tPLZ tPHZ Output Disable Time 5.0 (*) 1.5 6.5 10.0 1.5 11.0 ns (*) Voltage range is 5V ± 0.5V 74ACT244 4/9 |
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