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54LS244 Datasheet(PDF) 3 Page - National Semiconductor (TI) |
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54LS244 Datasheet(HTML) 3 Page - National Semiconductor (TI) |
3 / 6 page Switching Characteristics at VCC e 5V TA e 25 C (see Section 1 for Test Waveforms and Output Load) Symbol Parameter Conditions 54LS Max DM74LS Max Units tPLH Propagation Delay Time CL e 45 pF 18 18 ns Low to High Level Output RL e 667X tPHL Propagation Delay Time CL e 45 pF 18 18 ns High to Low Level Output RL e 667X tPZL Output Enable Time to CL e 45 pF 30 30 ns Low Level RL e 667X tPZH Output Enable Time to CL e 45 pF 23 23 ns High Level RL e 667X tPLZ Output Disable Time CL e 5pF 25 25 ns from Low Level RL e 667X tPHZ Output Disable Time CL e 5pF 18 18 ns from High Level RL e 667X tPLH Propagation Delay Time CL e 150 pF 21 ns Low to High Level Output RL e 667X tPHL Propagation Delay Time CL e 150 pF 22 ns High to Low Level Output RL e 667X tPZL Output Enable Time to CL e 150 pF 33 ns Low Level RL e 667X tPZH Output Enable Time to CL e 150 pF 26 ns High Level RL e 667X Note 54LS Output Load is CL e 50 pF for tPLH tPHL tPZL and tPZH 3 |
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