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SY58611U Datasheet(PDF) 6 Page - Micrel Semiconductor |
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SY58611U Datasheet(HTML) 6 Page - Micrel Semiconductor |
6 / 14 page Micrel, Inc. SY58610U November 2006 6 M9999-111406-A hbwhelp@micrel.com or (408) 955-1690 Functional Description Fail-Safe Input (FSI) The input includes a special fail-safe circuit to sense the amplitude of the input signal and to latch the outputs when there is no input signal present, or when the amplitude of the input signal drops sufficiently below 100mVPK (200mVPP), typically 30mVPK. Maximum frequency of the SY58610U is limited by the FSI function. Input Clock Failure Case If the input clock fails to a floating, static, or extremely low signal swing, such that the voltage swing across the input pair is less than 100mV, the FSI function will eliminate a metastable condition and latch the outputs to the last valid state. No ringing and no undetermined state will occur at the output under these conditions. The output recovers to normal operation once the input signal returns to a valid state with a swing greater than 100mV. Note that the FSI function will not prevent duty cycle distortion in case of a slowly deteriorating (but still toggling) input signal. Due to the FSI function, the propagation delay will depend on rise and fall time of the input signal and on its amplitude. Refer to “Typical Operating Characteristics” for detailed information. Timing Diagrams Figure 1a. Fail Safe Feature Figure 1b. Propagation Delay IN-to-Q |
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