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74VHCT257AMTR Scheda tecnica(PDF) 4 Page - STMicroelectronics |
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74VHCT257AMTR Scheda tecnica(HTML) 4 Page - STMicroelectronics |
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4 / 13 page  74VHCT257A 4/13 Table 6: DC Specifications Table 7: AC Electrical Characteristics (Input tr = tf = 3ns) (*) Voltage range is 5.0V ± 0.5V 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. VIH High Level Input Voltage 4.5 to 5.5 22 2 V VIL Low Level Input Voltage 4.5 to 5.5 0.8 0.8 0.8 V VOH High Level Output Voltage 4.5 IO=-50 µA 4.4 4.5 4.4 4.4 V 4.5 IO=-8 mA 3.94 3.8 3.7 VOL Low Level Output Voltage 4.5 IO=50 µA 0.0 0.1 0.1 0.1 V 4.5 IO=8 mA 0.36 0.44 0.55 IOZ High Impedance Output Leakage Current 5.5 VI = VIH or VIL VO = 0V to 5.5V ±0.25 ± 2.5 ± 2.5 µA II Input Leakage Current 0 to 5.5 VI = 5.5V or GND ± 0.1 ± 1.0 ± 1.0 µA ICC Quiescent Supply Current 5.5 VI = VCC or GND 440 40 µA +ICC Additional Worst Case Supply Current 5.5 One Input at 3.4V, other input at VCC or GND 1.35 1.5 1.5 mA IOPD Output Leakage Current 0 VOUT = 5.5V 0.5 5.0 5.0 µA 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 5.0 15 4.8 7.0 1.0 8.0 1.0 8.0 ns 5.0 50 5.5 8.0 1.0 9.0 1.0 9.0 tPLH tPHL Propagation Delay Time SELECT to Y 5.0 15 6.0 6.8 1.0 8.0 1.0 8.0 ns 5.0 50 7.0 8.8 1.0 10.0 1.0 10.0 tPZL tPZH Output Enable Time 5.0 15 5.8 6.8 1.0 8.0 1.0 8.0 ns 5.0 50 6.5 8.8 1.0 10.0 1.0 10.0 tPLZ tPHZ Output Disable Time 5.0 50 5.7 7.9 1.0 9.0 1.0 9.0 ns |
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