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SN54LS243 Fiches technique(PDF) 3 Page - Motorola, Inc |
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SN54LS243 Fiches technique(HTML) 3 Page - Motorola, Inc |
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3 / 5 page ![]() AC WAVEFORMS 1.3 V 1.3 V 1.3 V 1.3 V 1.3 V 1.3 V 1.3 V VIN VOUT tPLH tPHL 1.3 V 1.3 V VIN VOUT SW2 CL* 5 kΩ SW1 VCC RL TO OUTPUT UNDER TEST 1.3 V tPHL tPLH VE VE VOUT VE VE VOUT tPHZ 1.3 V 1.3 V tPZL tPLZ VOL 1.3 V ≥VOH 0.5 V tPZH 1.3 V Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 ≈ 1.3 V 0.5 V ≈ 1.3 V SWITCH POSITIONS 5-395 FAST AND LS TTL DATA SN54/74LS242 • SN54/74LS243 AC CHARACTERISTICS (TA = 25°C, VCC = 5.0 V) Symbol Parameter Limits Unit Test Conditions Symbol Parameter LS242 LS243 Unit Test Conditions Symbol Parameter Min Typ Max Min Typ Max Unit Test Conditions tPLH tPHL Propagation Delay, Data to Output 9.0 12 14 18 12 12 18 18 ns CL = 45 pF, RL = 667 Ω tPZH Output Enable Time to HIGH Level 15 23 15 23 ns CL = 45 pF, RL = 667 Ω tPZL Output Enable Time to LOW Level 20 30 20 30 ns tPLZ Output Disable Time from LOW Level 15 25 15 25 ns CL = 5.0 pF, RL = 667 Ω tPHZ Output Disable Time from HIGH Level 10 18 10 18 ns CL = 5.0 pF, RL = 667 Ω SYMBOL SW1 SW2 tPZH Open Closed tPZL Closed Open tPLZ Closed Closed tPHZ Closed Closed |
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