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54F648SMQB Datasheet(PDF) 7 Page - National Semiconductor (TI) |
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54F648SMQB Datasheet(HTML) 7 Page - National Semiconductor (TI) |
7 / 12 page ’F646’F648 AC Electrical Characteristics 74F 54F 74F TA ea25 C TA VCC e Mil TA VCC e Com Symbol Parameter VCC ea50V CL e 50 pF CL e 50 pF Units CL e 50 pF Min Max Min Max Min Max fmax Maximum Clock Frequency 90 75 90 MHz tPLH Propagation Delay 20 70 20 85 20 80 ns tPHL Clock to Bus 20 80 20 95 20 90 tPLH Propagation Delay 10 70 10 80 10 75 ns tPHL Bus to Bus (’F646) 10 65 10 80 10 70 tPLH Propagation Delay 20 85 10 100 20 90 ns tPHL Bus to Bus (’F648) 10 75 10 90 10 80 tPLH Propagation Delay 20 85 20 110 20 95 ns tPHL SBA or SAB to A or B 20 80 20 100 20 90 tPZH Enable Time 20 85 20 100 20 90 ns tPZL OE to A or B 20 120 20 135 20 125 tPHZ Disable Time 10 75 10 90 10 85 ns tPLZ OE to A or B 20 90 20 110 20 95 tPZH Enable Time 20 140 20 160 20 150 ns tPZL DIR to A or B 20 130 20 150 20 140 tPHZ Disable Time 10 90 10 100 10 95 ns tPLZ DIR to A or B 20 110 20 120 20 115 ’F646’F648 AC Operating Requirements 74F 54F 74F Symbol Parameter TA ea25 C TA VCC e Mil TA VCC e Com Units VCC ea50V Min Max Min Max Min Max ts(H) Setup Time HIGH or LOW 50 50 50 ns ts(L) Bus to Clock 50 50 50 th(H) Hold Time HIGH or LOW 20 25 20 ns th(L) Bus to Clock 20 25 20 tw(H) Clock Pulse Width 50 50 50 ns tw(L) HIGH or LOW 50 50 50 7 |
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