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DM74ALS257N Scheda tecnica(PDF) 4 Page - Fairchild Semiconductor |
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DM74ALS257N Scheda tecnica(HTML) 4 Page - Fairchild Semiconductor |
4 / 7 page www.fairchildsemi.com 4 Switching Characteristics DM74ALS257 over recommended operating free air temperature range Switching Characteristics DM74ALS258 over recommended operating free air temperature range Symbol Parameter Conditions From To Min Max Units tPLH Propagation Delay Time VCC = 4.5V to 5.5V Data Any Y 2 10 ns LOW-to-HIGH Level Output CL = 50 pF tPHL Propagation Delay Time RL = 500Ω Data Any Y 2 12 ns HIGH-to-LOW Level Output tPLH Propagation Delay Time Select Any Y 4 18 ns LOW-to-HIGH Level Output tPHL Propagation Delay Time Select Any Y 5 22 ns HIGH-to-LOW Level Output tZH Output Enable Time Output Any Y 4 16 ns to HIGH Level Control tZL Output Enable Time Output Any Y 5 18 ns to LOW Level Control tHZ Output Disable Time Output Any Y 2 10 ns from HIGH Level Control tLZ Output Disable Time Output Any Y 3 15 ns from LOW Level Control Symbol Parameter Conditions From To Min Max Units tPLH Propagation Delay Time VCC = 4.5V to 5.5V Data Any Y 2 8 ns LOW-to-HIGH Level Output CL = 50 pF tPHL Propagation Delay Time RL = 500Ω Data Any Y 2 7 ns HIGH-to-LOW Level Output tPLH Propagation Delay Time Select Any Y 3 20 ns LOW-to-HIGH Level Output tPHL Propagation Delay Time Select Any Y 5 25 ns HIGH-to-LOW Level Output tZH Output Enable Time Output Any Y 5 18 ns to HIGH Level Control tZL Output Enable Time Output Any Y 5 18 ns to LOW Level Control tHZ Output Disable Time Output Any Y 2 10 ns from HIGH Level Control tLZ Output Disable Time Output Any Y 3 18 ns from LOW Level Control |
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