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74AC74M 数据表(PDF) 5 Page - STMicroelectronics |
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74AC74M 数据表(HTML) 5 Page - STMicroelectronics |
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5 / 11 page ![]() CAPACITIVE CHARACTERISTICS Symbol Parameter Test Con dition s Value Unit VCC (V) TA =25 oC-40 to 85 oC Mi n. Typ. Max. Min . Max. CIN Input Capacitance 5.0 4 pF CPD Power Dissipation Capacitance (note 1) 5.0 35 pF 1) 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 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) Symbol Parameter T est Cond iti on Value Unit VCC (V) TA =25 oC-40 to 85 oC Mi n. Typ. Max. Min . Max. tPLH tPHL Propagation Delay Time CK to Q 3.3 (*) 713 14 ns 5.0 (**) 510 11 tPLH tPHL Propagation Delay Time PR or CLR to Q 3.3 (*) 612 13 ns 5.0 (**) 4.5 9 10 tw Pulse Width HIGH or LOW, CK or PR or CLR 3.3 (*) 1.5 5 7 ns 5.0 (**) 1.5 4 5 ts Setup Time D to CK HIGH or LOW 3.3 (*) -0.2 4 4 ns 5.0 (**) -0.2 3 3 th Hold Time D to CK HIGH or LOW 3.3 (*) 0.2 2 3 ns 5.0 (**) 0.2 2 3 tREM Removal Time PR or CLR to CK 3.3 (*) -1 1 1 ns 5.0 (**) -0.7 1 1 fMAX Maximum Clock Frequency 3.3 (*) 100 300 90 MHz 5.0 (**) 140 300 130 (*) Voltage range is 3.3V ± 0.3V (**) Voltage range is 5V ± 0.5V 74AC74 5/11 |
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