4720BDC

Overview

The National Semiconductor 4720BDC is a standard Static Random Access Memory (SRAM) integrated circuit. It features a memory capacity of 256 bits, organized as 256 words by 1 bit (256x1). The device utilizes parallel interface technology for data access and transfer. Key electrical specifications include a maximum access time of 500 nanoseconds. The component is housed in a 16-lead Ceramic Dual In-line Package (CDIP16), designed for through-hole mounting on printed circuit boards.

Feature Summary

• Standard SRAM architecture providing non-volatile-like static storage capabilities without the need for refresh cycles.
• Parallel interface configuration enabling direct bus connection for straightforward digital logic integration.
• Robust ceramic dual in-line package construction suitable for environments requiring high mechanical stability.

Applications

• Embedded systems requiring small-scale volatile data storage.
• Industrial control units utilizing legacy or specific interface requirements.
• Test and measurement equipment needing fast, simple memory access.

Procurement Notes

Verify the package type carefully, as sources indicate both WQFN and CDIP16 variants. Confirm the manufacturer origin, noting that National Semiconductor assets are now part of Texas Instruments. Ensure the specific lot date code meets project requirements due to potential availability from secondary markets. Request full datasheets to validate pinout and electrical characteristics before finalizing procurement decisions.

Selection Notes

Select this component when a 256-bit parallel SRAM with 500ns access speed is required. Consider the CDIP16 package if through-hole mounting is necessary for mechanical durability. Evaluate alternative packages like WQFN if surface-mount technology is preferred. Verify voltage levels and interface compatibility with the host microcontroller or logic family before implementation.

Part Context

This component belongs to the standard SRAM category within National Semiconductor's memory portfolio. It represents a basic memory solution for low-capacity data retention tasks. The brand has undergone corporate changes, with its semiconductor business acquired by Texas Instruments, affecting long-term support and sourcing channels for original components.

Replacement Considerations

Check for equivalent parts from Texas Instruments, which absorbed National Semiconductor. Verify pin-to-pin compatibility if substituting with other 256-bit SRAMs. Ensure access times do not exceed 500ns and interface types match. Consult official replacement guides for discontinued National products.