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M74HCT257C1R Scheda tecnica(PDF) 6 Page - STMicroelectronics |
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M74HCT257C1R Scheda tecnica(HTML) 6 Page - STMicroelectronics |
6 / 12 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 4.5 7 121518 ns tPLH tPHL Propagation Delay Time (A, B - Y) 4.5 HCT257 19 30 38 45 ns HCT258 17 27 34 41 tPLH tPHL Propagation Delay Time (SELECT - Y) 4.5 20 30 38 45 ns tPZL tPZH Output Enable Time 4.5 RL =1 K Ω 18 30 38 45 ns tPLZ tPHZ Output Disable Time 4.5 RL =1 K Ω 16 30 38 45 ns CIN Input Capacitance 5 10 10 10 pF COUT Output Capacitance 10 pF CPD (*) Power Dissipation Capacitance HCT257 HCT258 34 33 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) M54/M74HCT257/258 6/12 |
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