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TMUX1308 Datasheet(PDF) 25 Page - Texas Instruments |
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TMUX1308 Datasheet(HTML) 25 Page - Texas Instruments |
25 / 42 page ESD n p Control Circuitry Simplified injection curr ent circuitry Log ic D ecode Block ESD Control Circuitry Simplified injection curr ent circuitry Injected current into unselected switch input IINJ Figure 8-16. Injected Current at Input Pin Figure 8-17 shows an example of using a series limiting resistor in the case of an overvoltage event. RLIM ESD n p Control Circuitry Simplified injection curr ent circuitry Log ic D ecode Block ESD Control Circuitry Simplified injection curr ent circuitry VINPU T > VDD or VINPU T < GND VIN PU T Figure 8-17. Over-voltage Event with Series Resistor If the voltage at the source or drain pins is greater than VDD, or less than GND, the protection FET will be turned on for any disabled signal path and shunt the pin the GND. In this event, a series resistor is needed to limit the total current injected into the device to be less than 100 mA. Two example scenarios are: 8.3.5.1 TMUX13xx is Powered and the Input Signal is Greater Than VDD (VDD = 5 V, VINPUT = 5.5 V). A typical CMOS switch would have an internal ESD diode to the supply pin rated for about ≈30 mA that would be turned on and a series limited resistor would be needed. However, any conducted current would be injected into the supply rail potentially damaging the system, unexpectedly turning on other devices on the same supply rail, or requiring additional components for protection. The TMUX13xx implementation also handles this scenario with a series limiting resistor, however, the current path is now to GND which doesn’t have the same issues as the current injected into the supply rail. 8.3.5.2 TMUX13xx is Unpowered and the Input Signal has a Voltage Present (VDD = 0 V, VINPUT = 3 V) Many CMOS switches are unable to support a voltage at the input without a valid supply voltage present otherwise the voltage will be coupled from input to output and could damage downstream devices or impact power-sequencing. The TMUX13xx circuitry can handle an input signal present without a supply voltage while minimizing power transfer from the input to output of the switch. By limiting the output voltage coupling to 400 mV the TMUX1308 and TMUX1309 help reduce the chance of conduction through any downstream ESD diodes. www.ti.com TMUX1308, TMUX1309 SCDS426C – MARCH 2020 – REVISED AUGUST 2020 Copyright © 2020 Texas Instruments Incorporated Submit Document Feedback 25 Product Folder Links: TMUX1308 TMUX1309 |
Similar Part No. - TMUX1308_V01 |
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Similar Description - TMUX1308_V01 |
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