Final answer:
A SDRAM typically has 168 pins and 4 notches. These pins provide electrical connections, while the notches serve as a keying mechanism for correct insertion.
Step-by-step explanation:
A SDRAM (Synchronous Dynamic Random-Access Memory) typically has 168 pins and 4 notches. The pins are small metal connectors on the integrated circuit package that allow the memory module to be connected to a computer motherboard.
These pins provide the electrical connections between the SDRAM and the rest of the computer system, enabling the transfer of data and instructions.
The notches, on the other hand, are gaps or cut-out sections on the edge of the memory module. They serve as a physical keying mechanism to ensure that the SDRAM is inserted correctly into the memory slot on the motherboard. The number and arrangement of notches are designed to be unique to a specific type of memory module, preventing incompatible modules from being inserted.
It's worth noting that the number of pins and notches may vary depending on the specific type and form factor of the SDRAM module. The 168-pin configuration mentioned is commonly found in older SDRAM modules, while newer DDR (Double Data Rate) and DDR2 modules typically have a different pin configuration.