4 Pin Failure Mode Analysis (Pin FMA)

This section provides a failure mode analysis (FMA) for the pins of the SN74AXC4T245-Q1 (TSSOP, WQFN and UQFN packages). The failure modes covered in this document include the typical pin-by-pin failure scenarios:

• Pin short-circuited to ground (see Table 4-2)
• Pin open-circuited (see Table 4-3)
• Pin short-circuited to an adjacent pin (see Table 4-4)
• Pin short-circuited to supply (see Table 4-5 and Table 4-6)

Table 4-2 through Table 4-6 also indicate how these pin conditions can affect the device as per the failure effects classification in Table 4-1 .

Following are the assumptions of use and the device configuration assumed for the pin FMA in this section:

• External pullup resistor on CS to VDD
• RC filter on every analog input, AINx. Series resistors are sized to limit the input currents into the analog inputs to < 10mA in all circumstances (for example, in case the device is unpowered and the input signal is applied).
• The device is the only slave on the SPI bus.