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MC74HC4538A Datasheet(PDF) 6 Page - ON Semiconductor |
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MC74HC4538A Datasheet(HTML) 6 Page - ON Semiconductor |
6 / 16 page MC74HC4538A http://onsemi.com 6 OUTPUT PULSE WIDTH CHARACTERISTICS (CL = 50 pF)t Conditions Guaranteed Limits VCC –55 to 25 _C v 85_C v 125_C Symbol Parameter Timing Components VCC Volts Min Max Min Max Min Max Unit τ Output Pulse Width* (Figures 6 and 8) Rx = 10 kΩ, Cx = 0.1 µF 5.0 0.63 0.77 0.6 0.8 0.59 0.81 ms — Pulse Width Match Between Circuits in the same Package — — ± 5.0 % — Pulse Width Match Variation (Part to Part) — — ± 10 % *For output pulse widths greater than 100 µs, typically τ = kRxCx, where the value of k may be found in Figure 3. Figure 3. Typical Output Pulse Width Constant, k, versus Supply Voltage (For output pulse widths > 100 µs: τ = kRxCx) Figure 4. Output Pulse Width versus Timing Capacitance Figure 5. Normalized Output Pulse Width versus Power Supply Voltage 0.8 0.7 0.6 0.5 0.4 0.3 10 s 1 s 100 ms 10 ms 1 ms 100 µs 10 µs 1 µs 100 ns 1.1 1 0.9 0.8 0.7 0.6 0.5 123 45 67 0.00001 0.0001 0.001 0.01 0.1 1 10 100 1 2 3456 7 VCC, POWER SUPPLY VOLTAGE (VOLTS) CAPACITANCE ( µF) VCC, POWER SUPPLY VOLTAGE (VOLTS) TA = 25°C VCC = 5 V, TA = 25°C TA = 25°C Rx = 100 kΩ Cx = 1000 pF Rx = 1 MΩ Cx = 0.1 µF 1 k Ω 10 k Ω 1 M Ω 100 k Ω |
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