SCDA023 Functional safety information

SCDA023B April 2020 – January 2022 TMUX1308-Q1 , TMUX1309-Q1

4.2 TMUX1308-Q1 WQFN Package

The figure below shows the TMUX1308-Q1 pin diagram for the WQFN package. For a detailed description of the device pins please refer to the Pin Configuration and Functions section in the TMUX1308-Q1 and TMUX1309-Q1 data sheet.

Figure 4-3 Pin Diagram for TMUX1308-Q1 in WQFN Package

Table 4-6 Pin FMA for Device Pins Short-Circuited to Ground

Pin Name	Pin No.	Description of Potential Failure Effect(s)	Failure Effect Class
S4	1	Corruption of signal passed onto the D pin. If there is no limiting resistor in the switch path, then device damage is possible.	A
S6	2	Corruption of signal passed onto the D pin. If there is no limiting resistor in the switch path, then device damage is possible.	A
D	3	Corruption of signal passed onto the S pins. If there is no limiting resistor in the switch path, then device damage is possible.	A
S7	4	Corruption of signal passed onto the D pin. If there is no limiting resistor in the switch path, then device damage is possible.	A
S5	5	Corruption of signal passed onto the D pin. If there is no limiting resistor in the switch path, then device damage is possible.	A
EN	6	EN stuck low. Can no longer disable the device without power down.	B
N.C.	7	No effect, unconnected pin.	D
GND	8	No effect, normal operation.	D
A2	9	Address stuck low. Cannot control switch states.	B
A1	10	Address stuck low. Cannot control switch states.	B
A0	11	Address stuck low. Cannot control switch states.	B
S3	12	Corruption of signal passed onto the D pin. If there is no limiting resistor in the switch path, then device damage is possible.	A
S0	13	Corruption of signal passed onto the D pin. If there is no limiting resistor in the switch path, then device damage is possible.	A
S1	14	Corruption of signal passed onto the D pin. If there is no limiting resistor in the switch path, then device damage is possible.	A
S2	15	Corruption of signal passed onto the D pin. If there is no limiting resistor in the switch path, then device damage is possible.	A
VDD	16	Device is unpowered. Device is not functional. Observe that the absolute maximum ratings for all pins of the device are met, otherwise device damage is possible.	A
Thermal pad	—	No effect, normal operation.	D

Table 4-7 Pin FMA for Device Pins Open-Circuited

Pin Name	Pin No.	Description of potential failure effect(s)	Failure effect class
S4	1	Corruption of signal passed onto the D pin.	B
S6	2	Corruption of signal passed onto the D pin.	B
D	3	Corruption of signal passed onto the S pins.	B
S7	4	Corruption of signal passed onto the D pin.	B
S5	5	Corruption of signal passed onto the D pin.	B
EN	6	Control of the EN pin is lost. Cannot disable switch. Will default to switches disabled.	B
N.C.	7	No effect, unconnected pin.	D
GND	8	Device is unpowered. Device is not functional. Observe that the absolute maximum ratings for all pins of the device are met, otherwise device damage is possible.	A
A2	9	Control of the address pin is lost. Cannot control switch.	B
A1	10	Control of the address pin is lost. Cannot control switch.	B
A0	11	Control of the address pin is lost. Cannot control switch.	B
S3	12	Corruption of signal passed onto the D pin.	B
S0	13	Corruption of signal passed onto the D pin.	B
S1	14	Corruption of signal passed onto the D pin.	B
S2	15	Corruption of signal passed onto the D pin.	B
VDD	16	Device is unpowered. Device is not functional.	B
Thermal pad	—	No effect, normal operation.	D

Table 4-8 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
S4	1	S6	Possible corruption of signal passed onto the D pin.	B
S6	2	D	Possible corruption of signal passed onto the SX and D pin.	B
D	3	S7	Possible corruption of signal passed onto the SX and D pin.	B
S7	4	S5	Possible corruption of signal passed onto the D pin.	B
S5	5	EN	Possible corruption of signal passed onto the D pin. Switch state will be undefined.	B
EN	6	N.C.	No connect pin electrically floating, no effect.	D
N.C.	7	GND	No connect pin electrically floating, no effect.	D
GND	8	A2	Not considered, corner pin.	D
A2	9	A1	Loss of control of switch state.	B
A1	10	A0	Loss of control of switch state.	B
A0	11	S3	Possible corruption of signal passed onto the D pin. Loss of control of switch state.	B
S3	12	S0	Possible corruption of signal passed onto the D pin.	B
S0	13	S1	Possible corruption of signal passed onto the D pin.	B
S1	14	S2	Possible corruption of signal passed onto the D pin.	B
S2	15	VDD	Corruption of signal passed onto the D pin. If there is no limiting resistor in the switch path, then device damage is possible.	A
VDD	16	S4	Not considered, corner pin.	D

Table 4-9 Pin FMA for Device Pins Short-Circuited to VDD

Pin Name	Pin No.	Description of potential failure effect(s)	Failure effect class
S4	1	Corruption of signal passed onto the D pin. If there is no limiting resistor in the switch path, then device damage is possible.	A
S6	2	Corruption of signal passed onto the D pin. If there is no limiting resistor in the switch path, then device damage is possible.	A
D	3	Corruption of signal passed onto the S pins. If there is no limiting resistor in the switch path, then device damage is possible.	A
S7	4	Corruption of signal passed onto the D pin. If there is no limiting resistor in the switch path, then device damage is possible.	A
S5	5	Corruption of signal passed onto the D pin. If there is no limiting resistor in the switch path, then device damage is possible.	A
EN	6	EN stuck high. Can no longer enable the device.	B
N.C.	7	No effect, unconnected pin.	D
GND	8	Device is unpowered. Device is not functional. Observe that the absolute maximum ratings for all pins of the device are met, otherwise device damage may be plausible.	A
A2	9	Address stuck high. Cannot control switch states.	B
A1	10	Address stuck high. Cannot control switch states.	B
A0	11	Address stuck high. Cannot control switch states.	B
S3	12	Corruption of signal passed onto the D pin. If there is no limiting resistor in the switch path, then device damage is possible.	A
S0	13	Corruption of signal passed onto the D pin. If there is no limiting resistor in the switch path, then device damage is possible.	A
S1	14	Corruption of signal passed onto the D pin. If there is no limiting resistor in the switch path, then device damage is possible.	A
S2	15	Corruption of signal passed onto the D pin. If there is no limiting resistor in the switch path, then device damage is possible.	A
VDD	16	No effect, normal operation.	D
Thermal pad	—	No connect pin electrically floating, no effect.	D