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74VHC257T Datasheet(PDF) 5 Page - STMicroelectronics |
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74VHC257T Datasheet(HTML) 5 Page - STMicroelectronics |
5 / 14 page 74VHC257 5/14 Table 7: AC Electrical Characteristics (Input tr = tf = 3ns) (*) Voltage range is 3.3V ± 0.3V (**) Voltage range is 5.0V ± 0.5V Table 8: 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 x VCC x fIN + ICC/4 (per channel) Symbol Parameter Test Condition Value Unit VCC (V) CL (pF) TA = 25°C -40 to 85°C -55 to 125°C Min. Typ. Max. Min. Max. Min. Max. tPLH tPHL Propagation Delay Time A, B to Y 3.3(*) 15 5.8 9.3 1.0 11.0 1.0 11.0 ns 3.3(*) 50 8.3 12.8 1.0 14.5 1.0 14.5 5.0(**) 15 3.6 5.9 1.0 7.0 1.0 7.0 5.0(**) 50 5.1 7.9 1.0 9.0 1.0 9.0 tPLH tPHL Propagation Delay Time SELECT to Y 3.3(*) 15 7.0 11.0 1.0 13.0 1.0 13.0 ns 3.3(*) 50 9.5 14.5 1.0 16.5 1.0 16.5 5.0(**) 15 4.0 6.8 1.0 8.0 1.0 8.0 5.0(**) 50 5.5 8.8 1.0 10.0 1.0 10.0 tPZL tPZH Output Enable Time 3.3(*) 15 RL = 1KΩ 6.7 10.5 1.0 12.5 1.0 12.5 ns 3.3(*) 50 RL = 1KΩ 9.2 14.0 1.0 16.0 1.0 16.0 5.0(**) 15 RL = 1KΩ 3.6 6.8 1.0 8.0 1.0 8.0 5.0(**) 50 RL = 1KΩ 5.1 8.8 1.0 10.0 1.0 10.0 tPLZ tPHZ Output Disable Time 3.3(*) 50 RL = 1KΩ 8.6 12.0 1.0 13.5 1.0 13.5 ns 5.0(**) 50 RL = 1KΩ 5.7 7.9 1.0 9.0 1.0 9.0 Symbol Parameter Test Condition Value Unit TA = 25°C -40 to 85°C -55 to 125°C Min. Typ. Max. Min. Max. Min. Max. CIN Input Capacitance 610 10 10 pF COUT Output Capacitance 8pF CPD Power Dissipation Capacitance (note 1) 18 pF |
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