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MC74HCT374A Datasheet(PDF) 5 Page - ON Semiconductor |
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MC74HCT374A Datasheet(HTML) 5 Page - ON Semiconductor |
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MC74HCT374A http://onsemi.com 5 SWITCHING WAVEFORMS Figure 1. tr tf VCC GND tTHL tTLH 90% 1.3 V 10% 2.7 V 1.3 V 0.3 V CLOCK tPLH tPHL Q tw 1/fmax 1.3 V 1.3 V 1.3 V OUTPUT ENABLE Q tPZL tPLZ tPZH tPHZ 10% 90% 3 V GND HIGH IMPEDANCE VOL VOH HIGH IMPEDANCE 1.3 V DATA CLOCK 3 V 3 V GND GND VALID th tsu 1.3 V Figure 2. Figure 3. Q TEST CIRCUITS Figure 4. EXPANDED LOGIC DIAGRAM C D0 D1 D2 D3 D4 D5 D6 D7 3478 13 14 17 18 Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7 2569 12 15 16 19 DQ CLOCK OUTPUT ENABLE 11 1 *Includes all probe and jig capacitance CL* TEST POINT DEVICE UNDER TEST OUTPUT *Includes all probe and jig capacitance CL* TEST POINT DEVICE UNDER TEST OUTPUT CONNECT TO VCC WHEN TESTING tPLZ AND tPZL CONNECT TO GND WHEN TESTING tPHZ AND tPZH 1 k Ω Figure 5. C DQ C DQ C DQ C DQ C DQ C DQ C DQ |
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