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LTC6754ISC6#TRMPBF 数据表(PDF) 14 Page - Analog Devices |
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LTC6754ISC6#TRMPBF 数据表(HTML) 14 Page - Analog Devices |
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14 / 22 page ![]() LTC6754 14 6754f For more information www.linear.com/LTC6754 applicaTions inForMaTion Latching TheinternallatchoftheLTC6754UD(QFNpackage)retains the output state when the LE/HYST pin is taken to less than 400mV above the negative supply. Figures 7a to 7e illustrate the latch timing definitions. The latch setup time is defined as the time for which the input should be stable before the latch pin is asserted low to ensure that the correct state will be held at the output. The latch hold time is the interval after which the latch pin is asserted in which the input signal must remain stable for the output to be the correct state at the time latch was asserted. The latch propagation delay (tPL) is the time taken for the output to return to input control after the latch pin is released. Latching is disabled if the LE/HYST pin is left floating. 6754 F07a +IN – –IN t > tSETUP tPD Q – Q LE/HYST Figure 7a. Input State Change Properly Latched 6754 F07b +IN – –IN t < tSETUP Q – Q LE/HYST Figure 7b. Input State Change Setup Time Too Short 6754 F07c +IN – –IN t < tHOLD tPD Q – Q LE/HYST Figure 7c. Input State Not Held Long Enough, Wrong Output State Latched 6754 F07d +IN – –IN t > tHOLD tPD Q – Q LE/HYST t > tSETUP Figure 7d. Short Input Pulse Properly Captured and Latched 6754 F07e +IN – –IN tPL Q – Q LE/HYST Figure 7e. Latched Output Disabled |
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