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M54HC244 Datasheet(PDF) 5 Page - STMicroelectronics |
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M54HC244 Datasheet(HTML) 5 Page - STMicroelectronics |
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5 / 10 page ![]() M54HC244 5/10 AC ELECTRICAL CHARACTERISTICS (CL = 50 pF, Input tr =tf =6ns) CAPACITIVE CHARACTERISTICS 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 xVCC xfIN +ICC/8 (per circuit) Symbol Parameter Test Conditions Value Unit VCC (V) CL (pF) TA = 25°C -40 to 85°C -55 to 125°C Min. Typ. Max. Min. Max. Min. Max. tTLH tTHL Output Transition Time 2.0 50 25 60 75 90 ns 4.5 7 12 19 18 6.0 6 10 13 15 tPLH tPHL Propagation Delay Time 2.0 50 36 90 115 135 ns 4.5 12 18 23 27 6.0 10 15 20 23 2.0 150 51 130 165 195 ns 4.5 17 26 33 39 6.0 14 22 28 33 tPZL tPZH High Impedance Output Enable Time 2.0 50 RL =1 KΩ 48 125 155 190 ns 4.5 16 25 31 38 6.0 14 21 25 32 2.0 150 RL =1 KΩ 63 165 205 250 ns 4.5 21 33 41 50 6.0 18 28 35 43 tPLZ tPHZ High Impedance Output Disable Time 2.0 50 RL =1 KΩ 32 125 155 190 ns 4.5 15 25 31 38 6.0 14 21 26 32 Symbol Parameter Test Condition Value Unit VCC (V) TA = 25°C -40 to 85°C -55 to 125°C Min. Typ. Max. Min. Max. Min. Max. CIN Input Capacitance 5.0 5 10 10 10 pF COUT Output Capacitance 5.0 10 pF CPD Power Dissipation Capacitance (note 1) 5.0 33 pF |
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