SFFS820 May   2024 SN74AXC4T245-Q1

 

  1.   1
  2.   Trademarks
  3. 1Overview
  4. 2Functional Safety Failure In Time (FIT) Rates
    1. 2.1 TSSOP Package
    2. 2.2 WQFN Package
    3. 2.3 UQFN Package
  5. 3Failure Mode Distribution (FMD)
  6. 4Pin Failure Mode Analysis (Pin FMA)
    1. 4.1 TSSOP Package
    2. 4.2 WQFN Package
    3. 4.3 UQFN Package

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.

 Pin Diagram (UQFN) PackageFigure 4-3 Pin Diagram (UQFN) Package
Table 4-2 Pin FMA for Device Pins Short-Circuited to Ground
Pin NamePin No.Description of Potential Failure Effect(s)Failure Effect Class
VCCA1GND short to VCC, device will be bypassed - may cause system damage, but not device damageB
DIR2-3Direction control will fix B --> A directionB
1A1 - 2A24- 7If configured as an output then damage is possible. If configured as input, no damage, but output will not switchA
GND8 - 9Normal OperationD
2B2 - 1B110 - 13If configured as an output then damage is possible. If configured as input, no damage, but output will not switchA
OE (active low)14-15Outputs will remain enabledB
VCCB16GND short to VCC, device will be bypassed - may cause system damage, but not device damageB
Table 4-3 Pin FMA for Device Pins Open-Circuited
Pin NamePin No.Description of Potential Failure Effect(s)Failure Effect Class
VCCA1Device will not be poweredB
DIR2-3Direction control will fix B --> A directionB
1A1 - 2A24- 7If configured as output, normal operation. If configured as input, no damage, but output will not switchB
GND8 - 9Device will not be poweredB
2B2 - 1B110 - 13If configured as output, normal operation. If configured as input, no damage, but output will not switchB
OE (active low)14-15Outputs will remain enabledB
VCCB16Device will not be poweredB
Table 4-4 Pin FMA for Device Pins Short-Circuited to Adjacent Pin
Pin NamePin No.Shorted toDescription of Potential Failure Effect(s)Failure Effect Class
VCCA1DIR1Direction control will fix A --> B directionB
1DIR2-3DIR2If 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 currentA
1A14 - 51A2If 1A1 and 1A2 are configured as outputs then damage is possible. If configured as inputs, both bits will have the same value alwaysA
2A16-72A2If 2A1 and 2A2 are configured as outputs then damage is possible. If configured as inputs, both bits will have the same vA
GND8 - 9GNDNormal OperationD
GND9-102B2If 2B2 is configured as an output then damage is possible. If configured as input, output 2A2 will be fixed LOWA

2B2 or 2B1

10 - 131B2 or 1B1If 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 alwaysA
1B113-142OE (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)14-151OE (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 alwaysA
1OE (active low)24VCCAAll associated outputs will be inactive and cannot be enabledB
Table 4-5 Pin FMA for Device Pins Short-Circuited to VCCA
Pin NamePin No.Description of Potential Failure Effect(s)Failure Effect Class
VCCA1Normal OperationD
DIR2-3Direction control will fix A --> B directionB
1A1 - 2A24- 7If configured as an output then damage is possible. If configured as input, no damage, but output will not switchA
GND8 - 9GND short to VCC, device will be bypassed - may cause system damage, but not device damageB
2B2 - 1B110 - 13If configured as an output then damage is possible. If configured as input, damage is possible if VIH/VIL not metA
OE (active low)14-15Outputs will remain disabledB
VCCB16VCCA short to VCCB, device will be bypassed - may cause system damage, but not device damageB
Table 4-6 Pin FMA for Device Pins Short-Circuited to VCCB
Pin NamePin No.Description of Potential Failure Effect(s)Failure Effect Class
VCCA1VCCB short to VCCA, device will be bypassed - may cause system damage, but not device damageB
DIR2-3If 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 metA
1A1 - 2A24- 7If A1 is configured as an output then damage is possible. If configured as input, damage is possible if VIH/VIL not metA
GND8 - 9GND short to VCC, device will be bypassed - may cause system damage, but not device damageB
2B2 - 1B110 - 13If B2 is configured as an output then damage is possible. If configured as input, no damage, but output will not switchA
OE (active low)14-15If VCCA is greater than VCCB, then the outputs will remain disabled, If VCCA is less than VCCB, damage is possible if VIH/VIL not metA
VCCB16Normal OperationD