MOTOROLA MVME133-1 Analog output module

A supply pin is any pin that provides current to the circuit. While most supply pins are labeled such that they can be easily recognized as supply pins (examples: VDD, VDD1, VDD2, VDD_PLL, VCC, VCC1, VCC2, VCC_ANALOG, GND, AGND, DGND, VSS, VSS1, VSS2, VSS_PLL, VSS_ANALOG, etc.), others are not and require engineering judgment based on their function in the normal circuit operation (examples: Vbias, Vref, etc.). Supply pins typically transmit no information such as digital or analog signals, timing, clock signals, and voltage or current reference levels. An example of a pin that appears to be a supply pin but may be treated as a non-supply pin is the VPP pin on EPROM memories. The VPP puts the memory into a special, rarely used, programming state and supplies the high voltage needed for programming the memory.

Supply Pin Groups 

The supply pins are partitioned into Supply Pin Groups with each supply pin a member of one and only one Supply Pin Group. Supply pins that are not connected by metal to any other pins are single pin Supply Pin Groups. Supply pins that are interconnected by metal on the chip or within the package form a supply pin group. The metal interconnects should be verified through reliable device documentation. However, excessive metal trace resistance in the die interconnect associated with grouping these pins could lead to masking an ESD protection weakness in HBM testing.

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