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74LCX257MTR Datasheet(PDF) 5 Page - STMicroelectronics |
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74LCX257MTR Datasheet(HTML) 5 Page - STMicroelectronics |
5 / 13 page 74LCX257 5/13 Table 7: Dynamic Switching Characteristics 1) Number of outputs defined as "n". Measured with "n-1" outputs switching from HIGH to LOW or LOW to HIGH. The remaining output is measured in the LOW state. Table 8: AC Electrical Characteristics 1) Skew is defined as the absolute value of the difference between the actual propagation delay for any two outputs of the same device switch- ing in the same direction, either HIGH or LOW (tOSLH = | tPLHm - tPLHn|, tOSHL = | tPHLm - tPHLn|) 2) Parameter guaranteed by design Table 9: 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) TA = 25 °C Min. Typ. Max. VOLP Dynamic Low Level Quiet Output (note 1) 3.3 CL = 50pF VIL = 0V, VIH = 3.3V 0.8 V VOLV -0.8 Symbol Parameter Test Condition Value Unit VCC (V) CL (pF) RL ( Ω) ts = tr (ns) -40 to 85 °C -55 to 125 °C Min. Max. Min. Max. tPLH tPHL Propagation Delay Time (A, B to Y) 2.7 50 500 2.5 1.5 6.5 1.5 6.5 ns 3.0 to 3.6 1.5 6.0 1.5 6.0 tPLH tPHL Propagation Delay Time (SELECT to Y) 2.7 50 500 2.5 1.5 8.5 1.5 8.5 ns 3.0 to 3.6 1.5 7.0 1.5 7.0 tPZL tPZH Output Enable Time 2.7 50 500 2.5 1.5 8.5 1.5 8.5 ns 3.0 to 3.6 1.5 7.0 1.5 7.0 tPLZ tPHZ Output Disable Time 2.7 50 500 2.5 1.5 6.0 1.5 6.0 ns 3.0 to 3.6 1.5 5.5 1.5 5.5 tOSLH tOSHL Output To Output Skew Time (note1, 2) 3.0 to 3.6 50 500 2.5 1.0 1.0 ns Symbol Parameter Test Condition Value Unit VCC (V) TA = 25 °C Min. Typ. Max. CIN Input Capacitance 3.3 VIN = 0 to VCC 7pF COUT Output Capacitance 3.3 VIN = 0 to VCC 8pF CPD Power Dissipation Capacitance (note 1) 3.3 fIN = 10MHz VIN = 0 or VCC 25 pF |
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