74HC283D,652

Overview

The NXP USA Inc. 74HC283D,652 is a high-speed Si-gate CMOS 4-bit binary full adder with fast carry, compliant with JEDEC standard no. 7A and pin-compatible with low power Schottky TTL (LSTTL). It adds two 4-bit binary words plus an incoming carry to produce sum outputs and an outgoing carry. The device operates within a supply voltage range of 2.0 V to 6.0 V and supports ambient temperatures from -40 °C to +125 °C. Propagation delays vary by path; for example, CIN to S1 ranges from 15 ns to 160 ns depending on voltage and temperature.

Feature Summary

• High-speed 4-bit binary addition with fast internal look-ahead carry
• ESD protection exceeding 2000 V per HBM and 200 V per MM standards
• Supports both active HIGH and active LOW operands due to binary symmetry
• Cascadable in 4-bit increments for expanded arithmetic operations

Applications

• Implementing 3-bit or larger binary adders
• Constructing 5-input encoders with equally weighted inputs
• Building 5-input majority gates
• Dividing the adder into 2-bit and 1-bit stages

Procurement Notes

Verify the specific ordering suffix matches the required package type, as the 74HC283 family includes DIP, SO, SSOP, and TSSOP variants. Confirm that the selected component meets the necessary temperature range specifications for the intended application environment. Ensure compatibility with existing logic levels and load capacitance requirements before integration.

Selection Notes

Select this component when a 4-bit binary full adder with fast carry is required in a surface-mount configuration. Consider the propagation delay characteristics relative to the system clock speed and supply voltage. Verify that the input and output voltage levels align with the surrounding circuitry, particularly regarding VIH and VIL thresholds at the chosen operating voltage.

Part Context

The 74HC283 belongs to the 74HC series of high-speed CMOS logic devices manufactured by NXP. It serves as a fundamental arithmetic building block in digital systems, offering pin compatibility with older LSTTL technologies while providing improved speed and lower power consumption. The D variant specifically denotes the small outline package format suitable for automated surface-mount assembly processes.

Replacement Considerations

The datasheet references the 74HC583 as the BCD version equivalent. No other direct substitute part numbers are explicitly confirmed in the provided documentation.