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MC74HC393AN Datasheet(PDF) 5 Page - ON Semiconductor |
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MC74HC393AN Datasheet(HTML) 5 Page - ON Semiconductor |
5 / 8 page MC74HC393A http://onsemi.com 5 PIN DESCRIPTIONS INPUTS Clock (Pins 1, 13) Clock input. The internal flip–flops are toggled and the counter state advances on high–to–low transitions of the clock input. CONTROL INPUTS Reset (Pins 2, 12) Active–high, asynchronous reset. A separate reset is provided for each counter. A high at the Reset input prevents counting and forces all four outputs low. OUTPUTS Q1, Q2, Q3, Q4 (Pins 3, 4, 5, 6, 8, 9, 10, 11) Parallel binary outputs Q4 is the most significant bit. SWITCHING WAVEFORMS tPHL VCC GND VCC GND 50% 50% 50% trec CLOCK Q RESET Figure 1. Figure 2. Figure 3. Test Circuit Q1 Q2 Q3 Q4 CLOCK RESET 1, 13 2, 12 3, 11 4, 10 5, 9 6, 8 EXPANDED LOGIC DIAGRAM *Includes all probe and jig capacitance CL* TEST POINT DEVICE UNDER TEST OUTPUT CLOCK Q 90% 90% 50% 10% tf tr VCC GND tw 1/fmax tPLH tPHL 90% 50% 10% tTLH tTHL C DQ tw Q C DQ Q C DQ Q C DQ Q |
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