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74VHC245TTR Scheda tecnica(PDF) 4 Page - STMicroelectronics |
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74VHC245TTR Scheda tecnica(HTML) 4 Page - STMicroelectronics |
4 / 12 page 74VHC245 4/12 Table 7: AC Electrical Characteristics (Input tr = tf = 3ns) (*) Voltage range is 3.3V ± 0.3V (**) Voltage range is 5.0V ± 0.5V Note 1: Parameter guaranteed by design. tsoLH = |tpLHm - tpLHn|, tsoHL = |tpHLm - tpHLn| 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/8 (per circuit) 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 3.3(*) 15 5.8 8.4 1.0 10.0 1.0 10.0 ns 3.3(*) 50 8.3 11.9 1.0 13.5 1.0 13.5 5.0(**) 15 4.0 5.5 1.0 6.5 1.0 6.5 5.0(**) 50 5.5 7.5 1.0 8.5 1.0 8.5 tPZL tPZH Output Disable Time 3.3(*) 15 RL = 1KΩ 8.5 13.2 1.0 15.5 1.0 15.5 ns 3.3(*) 50 RL = 1KΩ 11.0 16.7 1.0 19.0 1.0 19.0 5.0(**) 15 RL = 1KΩ 5.8 8.5 1.0 10.0 1.0 10.0 5.0(**) 50 RL = 1KΩ 7.3 10.6 1.0 12.0 1.0 12.0 tPLZ tPHZ Output Enable Time 3.3(*) 50 RL = 1KΩ 11.5 15.8 1.0 18.0 1.0 18.0 ns 5.0(**) 50 RL = 1KΩ 7.0 9.7 1.0 11.0 1.0 11.0 tOSLH tOSHL Output to Output Skew time (note 1) 3.3(*) 50 1.5 1.5 1.5 ns 5.0(**) 50 1.0 1.0 1.0 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 410 10 10 pF CI/O Output Capacitance 8pF CPD Power Dissipation Capacitance (note 1) 21 pF |
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