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M74HC258F1R Datasheet(PDF) 6 Page - STMicroelectronics |
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M74HC258F1R Datasheet(HTML) 6 Page - STMicroelectronics |
6 / 11 page AC ELECTRICAL CHARACTERISTICS (CL =50 pF, Input tr =tf =6 ns) Symbol Parameter Test Conditions Value Unit VCC (V) TA =25 oC 54HC and 74HC -40 to 85 oC 74HC -55 to 125 oC 54HC Min. Typ. Max. Min. Max. Min. Max. tTLH tTHL Output Transition Time 2.0 30 75 95 110 ns 4.5 8 151922 6.0 7 131619 tPLH tPHL Propagation Delay Time (A, B - Y) 2.0 30 100 125 150 ns 4.5 12 20 25 30 6.0 10 17 21 26 tPLH tPHL Propagation Delay Time (SELECT - Y) 2.0 50 125 155 190 ns 4.5 16 25 31 38 6.0 14 21 26 32 tPLH tPHL Propagation Delay Time (STROBE - Y) 2.0 36 115 145 175 ns 4.5 12 23 29 35 6.0 10 20 25 30 CIN Input Capacitance 5 10 10 10 pF CPD (*) Power Dissipation Capacitance 47 pF (*) CPD is defined as the value of the IC’s internal equivalent capacitance which is calculated from the operating current consumption without load. (Refer to Test Circuit). Average operting current can be obtained by the following equation. ICC(opr) = CPD •VCC •fIN +ICC/4 (per channel) SWITCHING CHARACTERISTICS TEST CIR- CUIT TEST CIRCUIT ICC (Opr.) INPUT WAVEFORM IS THE SAME AS THAT IN CASE OF SWITCHING CHARACTERISTICS TEST. M54/M74HC157 M54/M74HC158 6/11 |
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