SBOA414 September 2020 – MONTH TLV4314-Q1

4 Pin Failure Mode Analysis (Pin FMA)

This section provides a Failure Mode Analysis (FMA) for the pins of the TLV4314-Q1. 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)

Table 4-2 through Table 4-5 also indicate how these pin conditions can affect the device as per the failure effects classification in Table 4-1.

Table 4-1 TI Classification of Failure Effects

Class	Failure Effects
A	Potential device damage that affects functionality
B	No device damage, but loss of functionality
C	No device damage, but performance degradation
D	No device damage, no impact to functionality or performance

Figure 4-1 shows the TLV4314-Q1 pin diagram. For a detailed description of the device pins please refer to the Pin Configuration and Functions section in the TLV4314-Q1 data sheet.

Figure 4-1 Pin Diagram

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

Single-supply operation is used. For example, V+ = 5V and V- = 0V

Table 4-2 Pin FMA for Device Pins Short-Circuited to Ground

Pin Name	Pin No.	Description of Potential Failure Effect(s)	Failure Effect Class
Out A	1	May cause device to overheat.	B
-IN A	2	Input at V- (GND) is valid input, however, desired application result is unlikely. Output goes high if +IN A is greater than zero volts.	C
+IN A	3	Input at V- (GND) is valid input, however, desired application result is unlikely. Output goes low if -IN A is greater than zero volts.	C
V+	4	Diodes from input to V+ may turn on due to input signal and cause electrical overstress (EOS). Main supply shorted. No power to device.	B
+IN B	5	Input at V- (GND) is valid input, however, desired application result is unlikely. Output goes low if -IN B is greater than zero volts.	C
-IN B	6	Input at V- (GND) is valid input, however, desired application result is unlikely. Output goes high if +IN B is greater than zero volts.	C
OUT B	7	May cause device to overheat.	B
OUT C	8	May cause device to overheat.	B
-IN C	9	Input at V- (GND) is valid input, however, desired application result is unlikely. Output goes high if +IN C is greater than zero volts.	C
+IN C	10	Input at V- (GND) is valid input, however, desired application result is unlikely. Output goes low if -IN C is greater than zero volts.	C
V-	11	Normal operation.	D
+IN D	12	Input at V- (GND) is valid input, however, desired application result is unlikely. Output goes low if -IN D is greater than zero volts.	C
-IN D	13	Input at V- (GND) is valid input, however, desired application result is unlikely. Output goes high if +IN D is greater than zero volts.	C
OUT D	14	May cause device to overheat.	B

Table 4-3 Pin FMA for Device Pins Open-Circuited

Pin Name	Pin No.	Description of Potential Failure Effect(s)	Failure Effect Class
OUT A	1	Output cannot be used by application.	C
-IN A	2	Floating input, circuit will likely not function as expected. Output may be high or low.	C
+IN A	3	Floating input, circuit will likely not function as expected. Output may be high or low.	C
V+	4	Highest voltage pin will drive V+ pin internally via internal diode.	B
+IN B	5	Floating input, circuit will likely not function as expected. Output may be high or low.	C
-IN B	6	Floating input, circuit will likely not function as expected. Output may be high or low.	C
OUT B	7	Output cannot be used by application.	C
OUT C	8	Output cannot be used by applications.	C
-IN C	9	Floating input, circuit will likely not function as expected. Output may be high or low.	C
+IN C	10	Floating input, circuit will likely not function as expected. Output may be high or low.	C
V-	11	Lowest voltage pin will drive V- pin internally via internal diode.	B
+IN D	12	Floating input, circuit will likely not function as expected. Output may be high or low.	C
-IN D	13	Floating input, circuit will likely not function as expected. Output may be high or low.	C
OUT D	14	Output cannot be used by application.	C

Table 4-4 Pin FMA for Device Pins Short-Circuited to Adjacent Pin

Pin Name	Pin No.	Shorted to	Description of Potential Failure Effect(s)	Failure Effect Class
OUT A	1	-IN A	Negative feedback, creates unity gain buffer.	C
-IN A	2	+IN A	No damage to device. Application circuit will not work.	C
+IN A	3	V+	Input at V+ is a valid input, however, desired application result is unlikely. Output goes high if -IN A is less than V+.	C
V+	4	+IN B	Input at V+ is a valid input, however, desired application result is unlikely. Output goes high if -IN B is less than V+.	C
+IN B	5	-IN B	No damage to device. Application circuit will not work.	C
-IN B	6	OUT B	Op amp configured as unity gain buffer.	C
OUT B	7	OUT C	Depending on output load and circuit, excess current could be drawn.	B
OUT C	8	-IN C	Op amp configured as unity gain buffer.	C
-IN C	9	+IN C	No damage to device. Application circuit will not work.	C
+IN C	10	V-	Input at V- is a valid input, however, desired application result is unlikely. Output goes low if -IN C is greater than zero volts.	C
V-	11	+IN D	Input at V- is a valid input, however, desired application result is unlikely. Output goes low if -IN D is greater than zero volts.	C
+IN D	12	-IN D	No damage to device. Application circuit will not work.	C
-IN D	13	OUT D	Op amp configured as unity gain buffer.	C
OUT D	14	OUT A	Depending on output load and circuit, excess current could be drawn.	B

Table 4-5 Pin FMA for Device Pins Short-Circuited to supply

Pin Name	Pin No.	Description of Potential Failure Effect(s)	Failure Effect Class
OUT A	1	May cause device to overheat.	B
-IN A	2	Input at V+ is valid input, however, desired application result is unlikely. Output goes low if +IN A is less than V+.	C
+IN A	3	Input at V+ is valid input, however, desired application result is unlikely. Output goes high if -IN A is less than V+.	C
V+	4	Normal operation.	D
+IN B	5	Input at V+ is valid input, however, desired application result is unlikely. Output goes high if -IN B is less than V+.	C
-IN B	6	Input at V+ is valid input, however, desired application result is unlikely. Output goes low if +IN B is less than V+.	C
OUT B	7	May cause device to overheat.	B
OUT C	8	May cause device to overheat.	B
-IN C	9	Input at V+ is valid input, however, desired application result is unlikely. Output goes low if +IN C is less than V+.	C
+IN C	10	Input at V+ is valid input, however, desired application result is unlikely. Output goes high in -IN C is less than V+.	C
V-	11	Main supply shorted to V- (GND). No power to device.	B
+IN D	12	Input at V+ is valid input, however, desired application result is unlikely. Ouput goes high if -IN D is less than V+.	C
-IN D	13	Input at V+ is valid input, however, desired application result is unlikely. Output goes low if +IN D is less than V+.	C
OUT D	14	May cause device to overheat.	B