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74AC646SPC Datasheet(PDF) 6 Page - Fairchild Semiconductor |
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74AC646SPC Datasheet(HTML) 6 Page - Fairchild Semiconductor |
6 / 9 page www.fairchildsemi.com 6 AC Electrical Characteristics for AC Note 8: Voltage Range 3.3 is 3.3V ± 0.3V Voltage Range 5.0 is 5.0V ± 0.5V AC Operating Requirements for AC Note 9: Voltage Range 3.3 is 3.3V ± 0.3V Voltage Range 5.0 is 5.0V ± 0.5V VCC TA = +25°CTA = −40°C to +85°C Symbol Parameter (V) CL = 50 pF CL = 50 pF Units (Note 8) Min Typ Max Min Max tPLH Propagation Delay 3.3 4.0 10.5 16.5 3.0 18.5 ns Clock to Bus 5.0 2.5 7.5 12.0 2.0 13.0 tPHL Propagation Delay 3.3 3.0 9.5 14.5 2.5 16.0 ns Clock to Bus 5.0 2.0 6.5 10.5 1.5 11.5 tPLH Propagation Delay 3.3 2.5 7.5 12.0 2.0 13.5 ns Bus to Bus 5.0 1.5 5.0 8.0 1.0 9.0 tPHL Propagation Delay 3.3 1.5 7.5 12.5 1.5 13.5 ns Bus to Bus 5.0 1.5 5.0 9.0 1.0 9.5 tPLH Propagation Delay 3.3 2.0 8.5 13.5 1.5 15.5 SBA or SAB to An or Bn 5.0 1.5 6.0 10.0 1.5 11.0 ns (w/ An or Bn HIGH or LOW) tPHL Propagation Delay 3.3 1.5 8.5 13.5 1.5 15.0 SBA or SAB to An or Bn 5.0 1.5 6.0 10.0 1.5 11.0 ns (w/ An or Bn HIGH or LOW) tPZH Enable Time 3.3 2.5 7.0 11.5 2.0 12.5 ns G to An or Bn 5.0 1.5 5.0 8.5 1.5 9.0 tPZL Enable Time 3.3 2.5 7.5 12.5 2.0 14.0 ns G to An or Bn 5.0 1.5 5.5 9.0 1.5 10.0 tPHZ Disable Time 3.3 3.0 8.0 12.5 2.5 13.5 ns G to An or Bn 5.0 2.0 6.5 10.0 2.0 11.0 tPLZ Disable Time 3.3 2.0 7.5 12.0 2.0 13.5 ns G to An or Bn 5.0 1.5 6.0 9.5 1.5 10.5 tPZH Enable Time 3.3 2.0 6.5 11.0 1.5 12.0 ns DIR to An or Bn 5.0 1.5 5.0 7.5 1.0 8.5 tPZL Enable Time 3.3 2.5 7.0 11.5 2.0 13.0 ns DIR to An or Bn 5.0 1.5 5.0 8.0 1.0 9.0 tPHZ Disable Time 3.3 2.5 7.5 11.5 1.5 12.5 ns DIR to An or Bn 5.0 1.5 5.5 9.5 1.5 10.0 tPLZ Disable Time 3.3 1.5 7.5 12.0 1.5 13.5 ns DIR to An or Bn 5.0 1.5 5.5 9.5 1.5 10.5 VCC TA = +25°CTA = −40°C to +85°C Symbol Parameter (V) CL = 50 pF CL = 50 pF Units (Note 9) Typ Guaranteed Minimum tS Setup Time, HIGH or LOW 3.3 2.0 5.0 5.5 ns Bus to Clock 5.0 1.5 4.0 4.5 tH Hold Time, HIGH or LOW 3.3 −1.5 0 0 ns Bus to Clock 5.0 −0.5 0.5 1.0 tW Clock Pulse Width 3.3 2.0 3.5 4.5 ns HIGH or LOW 5.0 2.0 3.5 3.5 |
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