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CD74HC646M Datasheet(PDF) 6 Page - Texas Instruments |
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CD74HC646M Datasheet(HTML) 6 Page - Texas Instruments |
6 / 14 page 6 Test Circuits and Waveforms NOTE: Outputs should be switching from 10% VCC to 90% VCC in accordance with device truth table. For fMAX, input duty cycle = 50%. FIGURE 1. HC CLOCK PULSE RISE AND FALL TIMES AND PULSE WIDTH FIGURE 2. HC TRANSITION TIMES AND PROPAGATION DELAY TIMES, COMBINATION LOGIC FIGURE 3. HC SETUP TIMES, HOLD TIMES, REMOVAL TIME, AND PROPAGATION DELAY TIMES FOR EDGE TRIGGERED SEQUENTIAL LOGIC CIRCUITS FIGURE 4. HC 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 5. HC THREE-STATE PROPAGATION DELAY TEST CIRCUIT CLOCK 90% 50% 10% GND VCC trCL tfCL 50% 50% tWL tWH 10% tWL + tWH = fCL I tPHL tPLH tTHL tTLH 90% 50% 10% 50% 10% INVERTING OUTPUT INPUT GND VCC tr = 6ns tf = 6ns 90% trCL tfCL GND VCC GND VCC 50% 90% 10% GND CLOCK INPUT DATA INPUT OUTPUT SET, RESET OR PRESET VCC 50% 50% 90% 10% 50% 90% tREM tPLH tSU(H) tTLH tTHL tH(L) tPHL IC CL 50pF tSU(L) tH(H) 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 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 CD74HC646 CD74HC646 |
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