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DM74121N Datasheet(PDF) 4 Page - Fairchild Semiconductor |
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DM74121N Datasheet(HTML) 4 Page - Fairchild Semiconductor |
4 / 5 page www.fairchildsemi.com 4 Switching Characteristics At VCC = 5V and TA = 25°C (See Test Waveforms and Output Load Section) Symbol Parameter From (Input) Conditions Min Max Units To (Output) tPLH Propagation Delay Time A1, A2 CEXT = 80 pF 70 ns LOW-to-HIGH Level Output to Q RINT to VCC tPLH Propagation Delay Time B to CL = 15 pF 55 ns LOW-to-HIGH Level Output Q RL = 400Ω tPHL Propagation Delay Time A1, A2 80 ns HIGH-to-LOW Level Output to Q tPHL Propagation Delay Time B 65 ns HIGH-to-LOW Level Output to Q tW(OUT) Output Pulse A1, A2 or B CEXT = 80 pF 70 150 ns Width Using the to Q, Q RINT to VCC Internal Timing Resistor RL = 400Ω CL = 15 pF tW(OUT) Output Pulse A1, A2 CEXT = 0 pF 50 ns Width Using Zero to Q, Q RINT to VCC Timing Capacitance RL = 400Ω CL = 15 pF tW(OUT) Output Pulse A1, A2 CEXT = 100pF 600 800 ns Width Using External to Q, Q RINT = 10 kΩ Timing Resistor RL = 400Ω CL = 15pF A1, A2 CEXT = 1 µF 68 ms to Q, Q RINT = 10 kΩ RL = 400Ω CL = 15 pF |
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