74LS181 Arithmetic Logic Unit/Function Generator
Package PDIP Series 74LS
74LS181 overview
The 74LS series of integrated circuits (ICs) was one of the most popular logic families of transistor-transistor logic (TTL) logic chips. 74LS series is a bipolar, low-power Schottky IC. The 74LS181 is an arithmetic logic unit (ALU} function generator that has a complexity of 75 equivalent gates on a monolithic chip. These circuits perform 16 binary arithmetic operations on two 4-bit words
Key specifications
Supply Voltage
4.75 - 5.25Vdc
Maximum Clock Frequency
40Mhz
Power Dissipation
2mW/gate @100kHz
Minimum Output Current
8mA
Propagation Delay
10nS
Fan Out (TTL Loads)
20
Datasheet
181.pdf
74LS181 features
- Full Look-Ahead for High-Speed Operations on Long Words
- Input Clamping Diodes Minimize Transmission-Line Effects
- Darlington Outputs Reduce Turn-Off Time
74LS181 pinout
| Pin | Name | Description |
|---|---|---|
| 1 | B0 | Active low Operand Input B0 |
| 2 | A0 | Active low Operand Input |
| 3 | S3 | Function Select Input S3 |
| 4 | S2 | Function Select Input S2 |
| 5 | S1 | Function Select Input S1 |
| 6 | S0 | Function Select Input S0 |
| 7 | Cn | Carry Input |
| 8 | M | Mode Control Input |
| 9 | F0 | Function Output F0 |
| 10 | F1 | Function Output F1 |
| 11 | F2 | Function Output F2 |
| 12 | GND | Ground Pin |
| 13 | F'3 | Function Output F'3 |
| 14 | A=B | Comparator Output |
| 15 | P' | Active low carry propagate |
| 16 | Cn+4 | Carry Output |
| 17 | G' | Active low-carry generator |
| 18 | B'3 | Active low Operand Input B'3 |
| 19 | A'3 | Active low Operand Input A'3 |
| 20 | B'2 | Active low Operand Input B'2 |
| 21 | A'2 | Active low Operand Input A'2 |
| 22 | B'1 | Active low Operand Input B'1 |
| 23 | A'1 | Active low Operand Input A'1 |
| 24 | VCC | Chip Supply Voltage |
74LS181 applications
- Enables computers to perform mathematical operations on binary numbers
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