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DM74AS257N Datasheet(PDF) 5 Page - Fairchild Semiconductor |
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DM74AS257N Datasheet(HTML) 5 Page - Fairchild Semiconductor |
5 / 8 page ©1986 Fairchild Semiconductor Corporation www.fairchildsemi.com DM74AS257, DM74AS258 Rev. 1.2 5 DM74AS257 Switching Characteristics Over recommended operating free air temperature range. DM74AS258 Switching Characteristics Over recommended operating free air temperature range. Symbol Parameter Conditions From To Min Max Units tPLH Propagation Delay Time, LOW-to-HIGH Level Output VCC = 4.5V to 5.5V, CL = 50 pF, RL = 500Ω Data Any Y 1 5.5 ns tPHL Propagation Delay Time, HIGH-to-LOW Level Output 16 ns tPLH Propagation Delay Time, LOW-to-HIGH Level Output Select Any Y 2 11 ns tPHL Propagation Delay Time, HIGH-to-LOW Level Output 210 ns tPZH Output Enable Time to HIGH Level OUTPUT Control Any Y 2 7.5 ns tPZL Output Enable Time to LOW Level 2 9.5 ns tPHZ Output Disable Time from HIGH Level OUTPUT Control Any Y 1.5 6.5 ns tPLZ Output Disable Time from LOW Level 27 ns Symbol Parameter Conditions From To Min. Max. Units tPLH Propagation Delay Time, LOW-to-HIGH Level Output VCC = 4.5V to 5.5V, CL = 50pF, RL = 500Ω Data Any Y 1 5 ns tPHL Propagation Delay Time, HIGH-to-LOW Level Output 14 ns tPLH Propagation Delay Time, LOW-to-HIGH Level Output Select Any Y 2 9.5 ns tPHL Propagation Delay Time, HIGH-to-LOW Level Output 210 ns tPZH Output Enable Time to HIGH Level OUTPUT Control Any Y 2 8 ns tPZL Output Enable Time to LOW Level 210 ns tPHZ Output Disable Time, from HIGH Level OUTPUT Control Any Y 1.5 6 ns tPLZ Output Disable Time from LOW Level 2 6.5 ns |
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