74LS182 DIP Look-Ahead Carry Generator
The 74LS182 is a high-speed TTL integrated circuit designed to perform the look-ahead carry function for up to four Arithmetic Logic Units (ALUs) or binary counters. When used in conjunction with the 74LS181 ALU, this device significantly reduces the overall propagation delay in multi-bit arithmetic operations. It anticipates the carry signal across a group of four ALUs simultaneously rather than waiting for the carry to ripple through each individual stage.
The IC processes the Carry Propagate (P) and Carry Generate (G) signals from each of the four ALUs to provide the necessary carry inputs for the next stages. By providing a "look-ahead" carry across 16-bit blocks, it allows digital systems to perform complex mathematical calculations at much higher speeds. Multiple 74LS182 units can be cascaded to provide look-ahead carry across 64 bits or more, making it an essential component for high-performance processor architecture and fast computation logic.
KEY FEATURES
- High-speed look-ahead carry generation for 16-bit blocks
- Specifically designed for use with 74LS181 and 74LS281 ALUs
- Reduces carry propagation delay in large-word systems
- Active-high or active-low logic compatibility
- Low power Schottky technology for high-speed efficiency
- Standard 16 pin dual in line package
SPECIFICATIONS
- Supply Voltage 4.75V to 5.25V
- Operating Temperature 0 to 70 Celsius
- Logic Type TTL Low Power Schottky
- Typical Propagation Delay 13ns
- Typical Power Dissipation 100mW
- High Level Output Current -0.4mA
- Low Level Output Current 8mA
- Input Voltage High 2.0V Minimum
INTERFACES
- G0 to G3 Carry generate inputs
- P0 to P3 Carry propagate inputs
- CN Carry input
- CN+X Carry output X
- CN+Y Carry output Y
- CN+Z Carry output Z
- G BAR Carry generate output
- P BAR Carry propagate output
- VCC Positive supply voltage
- GND Ground reference
