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M54HC298 数据表(PDF) 5 Page - STMicroelectronics |
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M54HC298 数据表(HTML) 5 Page - STMicroelectronics |
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5 / 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 (CLOCK - Q) 2.0 45 125 155 190 ns 4.5 15 25 31 38 6.0 13 21 26 32 fMAX Maximum Clock Frequency 2.0 7 22 5.6 4.6 MHz 4.5 35 67 28 23 6.0 41 79 33 25 tW(H) tW(L) Minimum Pulse Width (CLOCK) 2.0 18 75 95 110 ns 4.5 6 151922 6.0 6 131619 ts Minimum Set-up Time (A, B, C, D) 2.0 12 50 65 75 ns 4.5 3 101315 6.0 2 9 11 13 ts Minimum Set-up Time (W. S.) 2.0 30 75 95 110 ns 4.5 8 151922 6.0 6 131619 th Minimum Hold Time (A, B, C, D) 2.0 25 30 40 ns 4.5 5 6 8 6.0 4 5 7 th Minimum Hold Time (W. S.) 2.0 0 0 0 ns 4.5 0 0 0 6.0 0 0 0 CIN Input Capacitance 5 10 10 10 pF CPD (*) Power Dissipation Capacitance 39 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 bit), and the CPD for operating current can be obtained by the following equation: CPD = 27 + 12 x n M54/M74HC298 5/11 |
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