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MAX4711 Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX4711 Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 17 page NC_) and COM_ so that signals pass equally well in either direction. Positive Fault Condition When the signal on NO_ (or NC_) exceeds V+ by about 150mV, the high-fault comparator output is high, turn- ing off FETs N1 and P1. This makes the NO_ (or NC_) input high impedance regardless of the switch state. If the switch state is “off”, all FETs are turned off and both NO_ (or NC_) and COM_ are high impedance. If the switch state is “on”, clamp FET P2 is turned on, sourc- ing current from V+ to COM_. Negative Fault Condition When the signal on NO_ (or NC_) exceeds V- by about 150mV, the low-fault comparator output is high, turning off FETs N1 and P1. This makes the NO_ (or NC_) input high impedance regardless of the switch state. If the switch state is “off”, all FETs are turned off and both NO_ (or NC_) and COM_ are high impedance. If the switch state is “on”, clamp FET N2 is turned on, sinking current from COM_ to V-. Transient Fault Response and Recovery When a fast rise-time or fall-time transient on NC_ or NO_ exceeds V+ or V-, the output (COM_) follows the input to the supply rail with only a few nanoseconds delay. This delay is due to the switch on-resistance and circuit capacitance to ground. When the input transient returns to within the supply rails, however, there is a 700ns output recovery delay time. These values depend on the COM_ output resistance and capaci- tance, and are not production tested or guaranteed. The delays are not dependent on the fault amplitude. Higher COM_ output resistance and capacitance increase recovery times. COM_ and IN_ Pins FETs N2 and P2 can source about ±15mA from V+ or V- to COM_ in the fault condition. Ensure that if the COM_ pin is connected to a low-resistance load, the absolute maximum current rating of 40mA is never exceeded both in normal and fault conditions. Fault-Protected, Low-Voltage, Quad SPST Analog Switches ______________________________________________________________________________________ 11 V+ NO_ (NC_) IN_ GND V- HIGH FAULT LOW FAULT ON N1 P1 P2 COM_ N2 NC SWITCH -ESD DIODE NORMALLY OPEN SWITCH CONSTRUCTION Figure 1. Block Diagram |
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