전자부품 데이터시트 검색엔진 |
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DM74LS257BM 데이터시트(PDF) 3 Page - Fairchild Semiconductor |
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DM74LS257BM 데이터시트(HTML) 3 Page - Fairchild Semiconductor |
3 / 5 page 3 www.fairchildsemi.com Switching Characteristics VCC = 5V and TA = 25°C Note 5: CL = 5 pF Symbol Parameter RL = 667Ω Units From (Input) CL = 45 pF CL = 150 pF To (Output) Min Max Min Max tPLH Propagation Delay Time Data to Output 18 27 ns LOW-to-HIGH Level Output tPHL Propagation Delay Time Data to Output 18 27 ns HIGH-to-LOW Level Output tPLH Propagation Delay Time Select to Output 28 35 ns LOW-to-HIGH Level Output tPHL Propagation Delay Time Select to Output 35 42 ns HIGH-to-LOW Level Output tPZH Output Enable Time Output Control to Y 15 27 ns to HIGH Level Output tPZL Output Enable Time Output Control to Y 28 38 ns to LOW Level Output tPHZ Output Disable Time from Output Control to Y 28 ns HIGH Level Output (Note 5) tPLZ Output Disable Time from Output Control to Y 25 ns LOW Level Output (Note 5) |
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