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74LCX139TTR Scheda tecnica(PDF) 8 Page - STMicroelectronics |
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74LCX139TTR Scheda tecnica(HTML) 8 Page - STMicroelectronics |
8 / 17 page Electrical characteristics 74LCX139 8/17 Table 7. AC electrical characteristics Symbol Parameter Test condition Value Unit VCC (V) CL (pF) RL ( Ω) ts = tr (ns) -40 to 85 °C Min Max tPLH tPHL Propagation Delay Time A, B to Y 2.7 50 500 2.5 7.3 ns 3.0 to 3.6 1.0 6.2 tPLH tPHL Propagation Delay Time G to Y 2.7 50 500 2.5 5.8 ns 3.0 to 3.6 1.0 5.3 tOSLH tOSHL Output To Output Skew Time (1) (2) 1. Skew is defined as the absolute value of the difference between the actual propagation delay for any two outputs of the same device switching in the same direction, either HIGH or LOW (tOSLH = | tPLHm - tPLHn|, tOSHL = | tPHLm - tPHLn|) 2. Parameter guaranteed by design 3.0 to 3.6 50 500 2.5 1.0 ns Table 8. Capacitive characteristics Symbol Parameter Test condition Value Unit VCC (V) TA = 25 °C Min Typ Max CIN Input capacitance 3.3 VIN = 0 to VCC 6pF CPD Power dissipation capacitance (1) 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 3.3 fIN = 10MHz VIN = 0 or VCC 26 pF |
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