ESD protection is an important feature of most analog switching applications. Standard analog switches designed to provide up to ± 2kV protection. Designers can increase the additional ESD protection capability, Acer Aspire 5251-1549 battery but it will take up valuable board space and increase the capacitance of the input / output lines. However, some switches are designed with internal diode, can withstand up to ± 15kV ESD. (± 15kV) method to test these switches using the human body model (± 15kV) and IEC 61000-4-2 standards prescribed contact (typically ± 8kV) and air-gap discharge.for example, in a 4-wire system, a signal source is switched between the two loads,

For up to ± 36V overvoltage protection fault protection switch

The supply rail of the analog switch limits the allowed input signal voltage range. (See the above signal processing in the design section). If the input signal exceeds the supply rails, the device will be locked or permanently damaged. Under normal circumstances, Acer Aspire 3820T Battery this restriction is not a problem; but in some cases, the input signal is still present in the power off when the analog switch. (If the system power sequencing caused by the input signal is earlier than the supply voltage, laptop battery This occurs). Instantaneous beyond the normal power supply voltage range can also cause the lock or permanent damage.

Figure 10 shows the internal structure of the fault protection for the analog switch. If the switch (P2 or N2) is conductive, the the the COM output two internal "fallback" FET clamp at the power supply voltage. , COM output to maintain power range, and provide up to ± 13mA current according to the load size, Asus a42-a6 battery but there is no obvious current NO / NC pin. Worth mentioning is that the signal can be equally easily from the arbitrary direction of the ESD and fault protection for the analog switch by, but these fault protection is only valid on the input side.