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74VHC238 датащи(PDF) 4 Page - STMicroelectronics |
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74VHC238 датащи(HTML) 4 Page - STMicroelectronics |
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4 / 8 page ![]() CAPACITIVE CHARACTERISTICS Symb ol Parameter T est Cond ition s Val ue Un it TA =25 oC -40 to 85 oC Min. Typ . Max. Min . Max. CIN Input Capacitance 4 10 10 pF CPD Power Dissipation Capacitance (note 1) 37 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 AC ELECTRICAL CHARACTERISTICS (Input tr =tf =3 ns) Symb ol Parameter Test Co nditi on Val ue Un it VCC (V) CL (pF ) TA =25 oC -40 to 85 oC Min. Typ . Max. Min . Max. tPLH tPHL Propagation Delay Time A, B, C to Y 3.3 (*) 15 8.0 12.3 1.0 14.5 ns 3.3 (*) 50 10.5 15.8 1.0 18.0 5.0 (**) 15 5.5 8.1 1.0 9.5 5.0 (**) 50 7.0 10.1 1.0 11.5 tPLH tPHL Propagation Delay Time G1 to Y 3.3 (*) 15 8.1 12.8 1.0 15.0 ns 3.3 (*) 50 10.6 16.3 1.0 18.5 5.0 (**) 15 5.4 8.1 1.0 9.5 5.0 (**) 50 6.9 10.1 1.0 11.5 tPLH tPHL Propagation Delay Time G2A, G2B to Y 3.3 (*) 15 8.1 12.3 1.0 14.5 ns 3.3 (*) 50 10.6 15.8 1.0 18.0 5.0 (**) 15 5.7 8.1 1.0 9.5 5.0 (**) 50 7.2 10.1 1.0 11.5 (*) Voltage range is 3.3V ± 0.3V (**) Voltage range is 5V ± 0.5V TEST CIRCUIT CL = 15/50 pF or equivalent (includes jig and probe capacitance) RL =R1 =500 Ω orequivalent RT =ZOUT of pulse generator (typically 50 Ω) 74VHC238 4/8 |
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