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SL74LS244 数据表(PDF) 3 Page - System Logic Semiconductor |
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SL74LS244 数据表(HTML) 3 Page - System Logic Semiconductor |
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3 / 4 page ![]() SL74LS244 System Logic Semiconductor SLS note 1: Not more than one output should be shorted at a time, and duration of the short -circuit should not exceed one second AC ELECTRICAL CHARACTERISTICS (T A = 25 °C, V CC = 5.0 V, tr = 15 ns, tf = 6.0 ns) Symbol Parameter Test Condition Min Max Unit tPLH Propagation Delay, Data to Output 18 ns tPHL Propagation Delay, Data to Output CL = 45 pF, RL = 667 Ω 18 ns tPZH Output Enable Time 23 ns tPZL Output Enable Time 30 ns tPHZ Output Disable Time CL = 5 pF 18 ns tPLZ Output Disable Time RL = 667 Ω 25 ns tPZL - S1 closed, S2 opened tPZH- S1 opened, S2 closed tPLZ, tPHZ - S1 and S2 closed Figure 1. Switching Waveforms (See Figure 3) Figure 2. Switching Waveforms (See Figure 4) NOTES A. CL includes probe and jig capacitance. B. All diodes are 1N916 or 1N3064. NOTES A. CL includes probe and jig capacitance. B. All diodes are 1N916 or 1N3064. Figure 3. Test Circuit Figure 4. Test Circuit |
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