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MAX4534 Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX4534 Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 14 page Fault-Protected, High-Voltage, Single 4-to-1/Dual 2-to-1 Multiplexers ______________________________________________________________________________________ 11 Transient Fault Condition When a fast rising or falling transient on NO_ exceeds V+ or V-, the output (COM_) follows the input (NO_) 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 longer output recovery time. For positive faults, the recovery time is typically 2.5µs. For negative faults, the recovery time is typically 1.3µs. These values depend on the COM_ output resistance and capacitance. The delays do not depend on the fault amplitude. Higher COM_ output resistance and capacitance increase the recovery times. Non-Fault-Protected Pins FETs N2 and P2 can source about ±10mA from V+ or V- to the COM_ pin in the fault condition (Figure 1). Ensure that if the COM_ pin is connected to a low - impedance load, the 30mA absolute maximum current rating is never exceeded, both in normal and fault con- ditions. The GND, COM_, EN, and A_ pins do not have fault protection. Reverse ESD protection diodes are internal- ly connected between GND, COM_, A_, EN, and both V+ and V-. If a signal on GND, COM_, EN, or A_ exceeds V+ or V- by more than 300mV, one of these diodes will conduct. During normal operation, these reverse-biased ESD diodes leak a few nanoamps of current to V+ and V-. Fault Protection Voltage and Power-Off The maximum fault voltage on the NO_ pins is ±40V from ground when the power is off. With ±15V supply voltages, the highest voltage on NO_ can be V- + 40V, and the lowest voltage on NO_ can be V+ - 40V. Caution: Exceeding these limits can damage the IC. Logic-Level Thresholds The logic-level thresholds are CMOS and TTL compati- ble with V+ = 4.5V to 16.5V. Applications Information Ground There is no connection between the analog signal paths and GND. The analog signal paths consist of an N-channel and a P-channel MOSFET with their sources and drains paralleled, and their gates driven out of phase to V+ and V- by the logic-level translators. V+ and GND power the internal logic and logic-level translators and set the input logic thresholds. The logic- level translators convert the logic levels to switched V+ and V- signals to drive the gates of the channel MOSFETs. This drive signal is the only connection between the power supplies and the analog signals. GND, A_, EN, and COM_ have ESD protection diodes to V+ and V-. Supply Current Reduction When the logic signals are driven rail-to-rail from 0 to +15V or -15V to +15V, the current consumption will be reduced from 300µA (typ) to 180µA. Power Supplies The MAX4534/MAX4535 operate with bipolar supplies between ±4.5V and ±20V. The V+ and V- supplies need not be symmetrical, but their sum cannot exceed the 44V absolute maximum rating. The MAX4534/MAX4535 operate from single supplies between +9V and +36V when V- is connected to GND. |
Similar Part No. - MAX4534_05 |
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Similar Description - MAX4534_05 |
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