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MAX4632 Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX4632 Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 16 page Fault-Protected, High-Voltage, Dual Analog Switches 10 ______________________________________________________________________________________ Transient Fault Response and Recovery When a fast rising and falling transient on NO_ (or NC_) exceeds V+ or V-, the output (COM_) follows the input (IN_) to the supply rail with only a few nanoseconds of delay. This delay is due to the switch on-resistance and circuit capacitance to ground. However, when the input transient returns to within the supply rails, there is a longer output recovery time delay. For positive and negative faults, the recovery time is typically 2.5µs. These values depend on the COM_ output resistance and capacitance, and are not production tested or guaranteed. The delays are not dependent on the fault amplitude. Higher COM_ output resistance and capaci- tance increase recovery times. Fault-Protection Voltage and Power Off The maximum fault voltage on the NO_ (or NC_) pins is ±40V when the power is off. For the MAX4631/ MAX4633, with ±15V supplies, the highest voltage on NO_ (or NC_) can be +36V, and the lowest voltage on NO (or NC_) can be -36V. For the MAX4632, with ±15V supplies, the highest voltage on NO_ (or NC_) can be +25V, and the lowest voltage on NO_ (or NC_) can be -25V. Exceeding these limits can damage the device. IN_ Logic-Level Thresholds The logic-level thresholds are TTL/CMOS compatible when V+ is +15V. Raising V+ increases the threshold slightly; when V+ reaches +25V, the level threshold is about 2.8V—higher than the TTL output high-level mini- mum of 2.4V, but still compatible with CMOS outputs (see Typical Operating Characteristics). Increasing V- has no effect on the logic-level thresh- olds, but it does increase the gate-drive voltage to the signal FETs, reducing their on-resistance. Failure Modes The MAX4631/MAX4632/MAX4633 are not lightning arrestors or surge protectors. Exceeding the fault-pro- tection voltage limits on NO_ or NC_, even for very short periods, can cause the device to fail. The failure modes may not be obvious, and failure in one switch may or may not affect other switches in the same package. __________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 analog switch gates. This drive signal is the only connection between the power supplies and the analog signals. GND, IN_, 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 +12V or -15V to +15V, the supply current reduces to approximately half of the supply current when the logic input levels are at 0 to +5V. Power Supplies The MAX4631/MAX4632/MAX4633 operate with bipolar supplies between ±4.5V and ±18V. The V+ and V- sup- plies need not be symmetrical, but their difference can not exceed the absolute maximum rating of +44V. These devices operate from a single supply between +9V and +36V when V- is connected to GND. INPUT RANGE On Between Rails POWER SUPPLIES (V+, V-) NC_ On NO_ Off OUTPUT NC_ On Between Rails Off On NO_ On Between V+ and (+40V - V+) On Off V+ On Between V+ and (+40V - V+) Off On V+ On Between V- and (-40V - V-) On Off V- On Between V+ and (-40V - V-) Off On V- Off Between Rails Off Off Follows the load terminal voltage Table 1. Switch States in Normal and Fault Conditions |
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Similar Description - MAX4632 |
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