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74VHCT244AMTC Datasheet(PDF) 5 Page - Fairchild Semiconductor |
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74VHCT244AMTC Datasheet(HTML) 5 Page - Fairchild Semiconductor |
5 / 9 page ©1997 Fairchild Semiconductor Corporation www.fairchildsemi.com 74VHCT244A Rev. 1.3 5 AC Electrical Characteristics Notes: 7. Parameter guaranteed by design. tOSLH = |tPLH max – tPLH min|; tOSHL = |tPHL max – tPHL min| 8. CPD is defined as the value of the internal equivalent capacitance which is calculated from the operating current consumption without load. Average operating current can be obtained by the equation: ICC (Opr.) = CPD • VCC • fIN + ICC / 8 (per F/F). The total CPD when n pcs. of the Octal D Flip-Flop operates can be calculated by the equation: CPD (total) = 20 + 12n Symbol Parameter VCC (V) Conditions TA = 25°C TA = –40°C to +85°C Units Min. Typ. Max. Min. Max. tPLH, tPHL Propagation Delay Time 5.0 ± 0.5 CL = 15pF 5.4 7.4 1.0 8.5 ns CL = 50pF 5.9 8.4 1.0 9.5 tPZL, tPZH 3-STATE Output Enable Time 5.0 ± 0.5 RL = 1kΩ CL = 15pF 7.7 10.4 1.0 12.5 ns CL = 50pF 8.2 11.4 1.0 13.5 tPLZ, tPHZ 3-STATE Output Disable Time 5.0 ± 0.5 RL = 1kΩ CL = 50pF 8.8 11.4 1.0 13.0 ns tOSLH, tOSHL Output to Output Skew 5.0 ± 0.5 (7) 1.0 1.0 ns CIN Input Capacitance VCC = Open 4 10 10 pF COUT Output Capacitance VCC = 5.0V 9 pF CPD Power Dissipation Capacitance (8) 18 pF |
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