Question 10.22: Explain the 7483, 4-bit full adder. Give a brief description......
Explain the 7483, 4-bit full adder. Give a brief description of available MSI adder ICs.
Medium-Scale-Integration (MSI) ICs are available with four full-adders in a single package. Table 10.3 lists the most popular adder ICs. Each adder in the table contains four full-adders, and all are functionally equivalent; however their pin layouts differ (refer to data manual for pin layouts). Each of them will add two 4-bit binary words plus one incoming carry. The binary sum appears on the sum outputs \left(\Sigma_{1}\right. to \left.\Sigma_{4}\right) and the outgoing carry.
Figure 10.13 shows the functional diagram and the logic diagram for the 7483. In the figure the least significant binary inputs \left(2^{\circ}\right) come into the A_{1} B_{1} terminals, and the most significant \left(2^{3}\right) come into the A_{4} B_{4} terminals.
Table 10.3 MSI Adder ICs
| Device | Family | Description |
| 7483 | TTL | 4-Bit binary full-adder, fast carry |
| 74HC283 | CMOS | 4-Bit binary full-adder, fast carry |
| 4008 | CMOS | 4-Bit binary full-adder, fast carry |
