SN74S225N

Overview

The SN74S225N is an asynchronous first-in, first-out (FIFO) memory device manufactured by Texas Instruments. It provides a total storage capacity of 80 bits, organized as sixteen words of five bits each. The component features three-state outputs for bus-driven applications and operates within a supply voltage range of 4.5 V to 5.5 V. Designed for unidirectional data transfer, it supports clock frequencies up to 10 MHz. The device is housed in a 20-pin PDIP package and functions reliably across an operating temperature range of 0°C to +70°C.

Feature Summary

• Asynchronous FIFO architecture supporting unidirectional data flow
• Eighty-bit memory capacity structured as sixteen five-bit words
• Three-state outputs enabling direct connection to system buses

Applications

• Unidirectional data buffering between asynchronous logic systems
• Temporary storage in high-speed digital signal processing paths
• Interface matching between components with different clock domains

Procurement Notes

Verify the specific suffix 'N' confirms the 20-pin PDIP package variant. Confirm RoHS compliance status through official documentation as requirements vary by region. Check current production lifecycle status to ensure long-term availability. Validate that the 10 MHz maximum frequency meets your system timing requirements. Ensure the 0°C to +70°C commercial temperature range suits your operational environment.

Selection Notes

Select this component when unidirectional asynchronous buffering is required for five-bit wide data paths. The 16-word depth is suitable for moderate latency tolerance applications. Consider the 20-pin DIP package only if through-hole mounting is necessary. Verify that the 10 MHz speed rating aligns with your system clock constraints. Evaluate power consumption against other AS-series logic options if efficiency is critical.

Part Context

This part belongs to the Texas Instruments SN74AS/74S logic family, known for high-speed performance. The SN74S225 specifically addresses FIFO memory needs within this series. It complements other multiplexer and decoder devices like the SN74AS257 by providing temporary storage capabilities. The device represents a standard solution for managing data flow in legacy and industrial digital systems requiring reliable asynchronous handshaking.

Replacement Considerations

Direct substitutes include the SN74S225J for ceramic DIP packaging or SN74S225PC for plastic DIP variants. Cross-reference with SN74LS225 for slower, lower-power alternatives if speed is not critical. Verify pin compatibility before swapping with generic FIFO ICs from other manufacturers.