SFFS820 May 2024 SN74AXC4T245-Q1
4.3 UQFN Package
Figure 4-3 shows the SN74AXC4T245-Q1 pin diagram for the UQFN package. For a detailed description of the device pins, see the Pin Configuration and Functions section in the SN74AXC4T245-Q1 data sheet.
Figure 4-3 Pin Diagram (UQFN) PackageTable 4-2 Pin FMA for Device Pins Short-Circuited to Ground
| Pin Name | Pin No. | Description of Potential Failure Effect(s) | Failure Effect Class |
|---|---|---|---|
| VCCA | 1 | GND short to VCC, device will be bypassed - may cause system damage, but not device damage | B |
| DIR | 2-3 | Direction control will fix B --> A direction | B |
| 1A1 - 2A2 | 4- 7 | If configured as an output then damage is possible. If configured as input, no damage, but output will not switch | A |
| GND | 8 - 9 | Normal Operation | D |
| 2B2 - 1B1 | 10 - 13 | If configured as an output then damage is possible. If configured as input, no damage, but output will not switch | A |
| OE (active low) | 14-15 | Outputs will remain enabled | B |
| VCCB | 16 | GND short to VCC, device will be bypassed - may cause system damage, but not device damage | B |
Table 4-3 Pin FMA for Device Pins Open-Circuited
| Pin Name | Pin No. | Description of Potential Failure Effect(s) | Failure Effect Class |
|---|---|---|---|
| VCCA | 1 | Device will not be powered | B |
| DIR | 2-3 | Direction control will fix B --> A direction | B |
| 1A1 - 2A2 | 4- 7 | If configured as output, normal operation. If configured as input, no damage, but output will not switch | B |
| GND | 8 - 9 | Device will not be powered | B |
| 2B2 - 1B1 | 10 - 13 | If configured as output, normal operation. If configured as input, no damage, but output will not switch | B |
| OE (active low) | 14-15 | Outputs will remain enabled | B |
| VCCB | 16 | Device will not be powered | B |
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 |
|---|---|---|---|---|
| VCCA | 1 | DIR1 | Direction control will fix A --> B direction | B |
| 1DIR | 2-3 | DIR2 | If both HIGH, direction control will fix A --> B direction. If both LOW, direction control will fix B --> A direction. If one DIR is HIGH and the other is LOW, bus contention during transitions could occur and may cause high current | A |
| 1A1 | 4 - 5 | 1A2 | If 1A1 and 1A2 are configured as outputs then damage is possible. If configured as inputs, both bits will have the same value always | A |
| 2A1 | 6-7 | 2A2 | If 2A1 and 2A2 are configured as outputs then damage is possible. If configured as inputs, both bits will have the same v | A |
| GND | 8 - 9 | GND | Normal Operation | D |
| GND | 9-10 | 2B2 | If 2B2 is configured as an output then damage is possible. If configured as input, output 2A2 will be fixed LOW | A |
2B2 or 2B1 | 10 - 13 | 1B2 or 1B1 | If 2B2, 2B1, 1B2 and/or 1B1 are configured as outputs then damage is possible. If configured as inputs, both shorted bits will have the same value always | A |
| 1B1 | 13-14 | 2OE (active low) | If 1B1 is configured as an output then damage is possible. If configured as input, no damage, but output 1A1 will remain HIGH or LOW dependent on 2OE (active low) | A |
| 2OE (active low) | 14-15 | 1OE (active low) | If 2OE and 1OE are configured as HIGH and LOW damage is possible. If configured as HIGH or LOW, both bits will have the same value always | A |
| 1OE (active low) | 24 | VCCA | All associated outputs will be inactive and cannot be enabled | B |
Table 4-5 Pin FMA for Device Pins Short-Circuited to VCCA
| Pin Name | Pin No. | Description of Potential Failure Effect(s) | Failure Effect Class |
|---|---|---|---|
| VCCA | 1 | Normal Operation | D |
| DIR | 2-3 | Direction control will fix A --> B direction | B |
| 1A1 - 2A2 | 4- 7 | If configured as an output then damage is possible. If configured as input, no damage, but output will not switch | A |
| GND | 8 - 9 | GND short to VCC, device will be bypassed - may cause system damage, but not device damage | B |
| 2B2 - 1B1 | 10 - 13 | If configured as an output then damage is possible. If configured as input, damage is possible if VIH/VIL not met | A |
| OE (active low) | 14-15 | Outputs will remain disabled | B |
| VCCB | 16 | VCCA short to VCCB, device will be bypassed - may cause system damage, but not device damage | B |
Table 4-6 Pin FMA for Device Pins Short-Circuited to VCCB
| Pin Name | Pin No. | Description of Potential Failure Effect(s) | Failure Effect Class |
|---|---|---|---|
| VCCA | 1 | VCCB short to VCCA, device will be bypassed - may cause system damage, but not device damage | B |
| DIR | 2-3 | If VCCA is greater than VCCB, then the direction control will fix B-->A, If VCCA is less than VCCB, damage is possible if VIH/VIL not met | A |
| 1A1 - 2A2 | 4- 7 | If A1 is configured as an output then damage is possible. If configured as input, damage is possible if VIH/VIL not met | A |
| GND | 8 - 9 | GND short to VCC, device will be bypassed - may cause system damage, but not device damage | B |
| 2B2 - 1B1 | 10 - 13 | If B2 is configured as an output then damage is possible. If configured as input, no damage, but output will not switch | A |
| OE (active low) | 14-15 | If VCCA is greater than VCCB, then the outputs will remain disabled, If VCCA is less than VCCB, damage is possible if VIH/VIL not met | A |
| VCCB | 16 | Normal Operation | D |