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TLC139 Arkusz danych(PDF) 9 Page - Texas Instruments |
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TLC139 Arkusz danych(HTML) 9 Page - Texas Instruments |
9 / 30 page TLC139, TLC339, TLC339Q LinCMOS MICROPOWER QUAD COMPARATORS 9 WWW.TI.COM PARAMETER MEASUREMENT INFORMATION Propagation delay time is defined as the interval between the application of an input step function and the instant when the output reaches 50% of its maximum value. Propagation delay time, low-to-high-level output, is measured from the leading edge of the input pulse, while propagation delay time, high-to-low-level output, is measured from the trailing edge of the input pulse. Propagation delay time measurement at low input signal levels can be greatly affected by the input offset voltage. The offset voltage should be balanced by the adjustment at the inverting input as shown in Figure 3, so that the circuit is just at the transition point. Then a low signal, for example 105-mV or 5-mV overdrive, causes the output to change state. 90% Pulse Generator VDD DUT TEST CIRCUIT Input Offset Voltage Compensation Adjustment Low-to-High-Level Output VOLTAGE WAVEFORMS High-to-Low-Level Output 1 µF 5.1 k Ω 50 Ω 1 k Ω 1 V −1 V 10 Ω 10 Turn 0.1 µF CL (see Note A) Overdrive Input Overdrive Input 100 mV 100 mV 50% 50% 10% tPLH tPHL tTHL NOTE A: CL includes probe and jig capacitance. Figure 3. Propagation Delay, Rise, and Fall Times Test Circuit and Voltage Waveforms |
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