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CD74HC173NSR Datasheet(PDF) 9 Page - Texas Instruments |
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CD74HC173NSR Datasheet(HTML) 9 Page - Texas Instruments |
9 / 17 page 9 FIGURE 7. HC THREE-STATE PROPAGATION DELAY WAVEFORM FIGURE 8. HCT THREE-STATE PROPAGATION DELAY WAVEFORM NOTE: Open drain waveforms tPLZ and tPZL are the same as those for three-state shown on the left. The test circuit is Output RL =1kΩ to VCC, CL = 50pF. FIGURE 9. HC AND HCT THREE-STATE PROPAGATION DELAY TEST CIRCUIT Test Circuits and Waveforms (Continued) 50% 10% 90% GND VCC 10% 90% 50% 50% OUTPUT DISABLE OUTPUT LOW TO OFF OUTPUT HIGH TO OFF OUTPUTS ENABLED OUTPUTS DISABLED OUTPUTS ENABLED 6ns 6ns tPZH tPHZ tPZL tPLZ 0.3 2.7 GND 3V 10% 90% 1.3V 1.3V OUTPUT DISABLE OUTPUT LOW TO OFF OUTPUT HIGH TO OFF OUTPUTS ENABLED OUTPUTS DISABLED OUTPUTS ENABLED tr 6ns tPZH tPHZ tPZL tPLZ 6ns tf 1.3 IC WITH THREE- STATE OUTPUT OTHER INPUTS TIED HIGH OR LOW OUTPUT DISABLE VCC FOR tPLZ AND tPZL GND FOR tPHZ AND tPZH OUTPUT RL = 1kΩ CL 50pF CD54HC173, CD74HC173, CD54HCT173, CD74HCT173 |
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