74F181PC

Overview

The onsemi 74F181PC is a 4-bit Arithmetic Logic Unit (ALU) housed in a 24-lead Plastic Dual-In-Line Package (PDIP). It operates within a supply voltage range of +4.5V to +5.5V and supports an ambient temperature range of 0°C to +70°C. The device performs all 16 logic operations and various arithmetic functions on two variables, utilizing full internal carry lookahead for high-speed processing. Key electrical characteristics include a propagation delay of up to 13.0 ns from A or B inputs to the Cn+4 output in sum mode at +25°C, with a maximum power supply current of 65.0 mA.

Feature Summary

• Performs all 16 possible logic operations and a variety of arithmetic operations on two 4-bit variables
• Incorporates full internal carry lookahead to support high-speed arithmetic over long word lengths
• Supports both active-high and active-low operand configurations
• Provides open-collector outputs for Carry Generate (G), Carry Propagate (P), and Equality (A=B)

Applications

• High-speed parallel arithmetic processing units
• Digital signal processing systems requiring complex logic functions
• Computer arithmetic cores and data path control logic

Procurement Notes

Verify the specific package width variant during procurement. The 'PC' suffix denotes the 0.600-inch wide JEDEC MS-011 PDIP (Package Number N24A), distinct from the narrower 0.300-inch SPC variant. Confirm RoHS compliance status as datasheets may vary by manufacturing date. Ensure the source document matches the exact part number to avoid confusion with similar F-series ALUs.

Selection Notes

Select this component when a 4-bit ALU with full lookahead capability is required for standard TTL-compatible logic levels. It is suitable for designs needing simultaneous logic and arithmetic execution without external carry chains. Consider the 24-pin PDIP form factor for through-hole assembly requirements. Evaluate power consumption against other F-series devices if thermal management is critical.

Part Context

This component belongs to the 74F series of high-speed Schottky TTL logic devices. It serves as a fundamental building block for digital arithmetic circuits, offering significantly faster performance than standard 74S series counterparts while consuming less power. The 74F181 is widely recognized in legacy digital design for its comprehensive function set and integrated carry lookahead features.

Replacement Considerations

Direct substitutes include the 74F181SPC, which shares identical functionality but utilizes a narrower 0.300-inch 24-PDIP package (JEDEC MS-001). Other compatible parts must match the 4-bit ALU specification, 74F logic family speed/power profile, and 24-pin DIP footprint.