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TMUX1308 bảng dữ liệu(PDF) 24 Page - Texas Instruments |
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TMUX1308 bảng dữ liệu(HTML) 24 Page - Texas Instruments |
24 / 42 page S1 S2 I I/O D VDD -ûV error ON OFF +ûV error V S2 V D V S2 Figure 8-14. Injected Current Impact on RON To avoid the complications of added external protection to your system, the TMUX1308 and TMUX1309 devices have an internal injection current control feature which eliminates the need for external diode/resistor networks typically used to protect the switch and keep the input signals within the supply voltage. The internal injection current control circuitry allows signals on disabled signal paths to exceed the supply voltage without affecting the signal of the enabled signal path. The injection current control circuitry also protects the TMUX13xx from currents injected into disabled signal paths without impacting the enabled signal path, which typical CMOS switches do not support. Additionally, the TMUX1308 and TMUX1309 do not have any internal diode paths to the supply pin, which eliminates the risk of damaging components connected to the supply pin, or providing unintended power to the system supply rail. Figure 8-12 shows a simplified diagram of one signal path for the TMUX13xx devices and the associated injection current circuit. ESD n p Control Circuitry Simplified injection curr ent circuitry Log ic D ecode Block ESD Control Circuitry Simplified injection curr ent circuitry Figure 8-15. Simplified Diagram of Injection Current Control The injection current control circuitry is independently controlled for each source or drain pin (Sx, D). The control circuitry for a particular pin is enabled when that input is disabled by the logic pins and the injected current causes the voltage at the pin to be above VDD or below GND. The injection current circuit includes a FET to shunt undesired current to GND in the case of overvoltage or injected current events. Each injection current circuit is rated to handle up to 50 mA, however the device can support a maximum current of 100 mA at any given time. Depending on the system application, a series limiting resistor may be needed and must be sized appropriately. Figure 8-15 shows the TMUX13xx protection circuitry with an injected current at an input pin. TMUX1308, TMUX1309 SCDS426C – MARCH 2020 – REVISED AUGUST 2020 www.ti.com 24 Submit Document Feedback Copyright © 2020 Texas Instruments Incorporated Product Folder Links: TMUX1308 TMUX1309 |
Số phần tương tự - TMUX1308_V01 |
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Mô tả tương tự - TMUX1308_V01 |
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