4720BDM

Overview

The Fairchild Semiconductor 4720BDM is a standard SRAM memory integrated circuit organized as 256 words by 1 bit. It features an asynchronous operating mode with a maximum access time of 500 nanoseconds. The device utilizes CMOS technology and provides three-state outputs for bus interfacing. It is housed in a 16-lead ceramic dual in-line package (CDIP). The component operates within a temperature range of -55°C to 125°C and has a moisture sensitivity level of 2A.

Feature Summary

• Asynchronous operation with three-state outputs
• CMOS technology construction
• Ceramic dual in-line packaging

Applications

• Memory systems
• Microprocessor systems
• Asynchronous bidirectional data buses

Procurement Notes

Verify the specific package variant, as the 4720B series includes both plastic (PDIP) and ceramic (CDIP) options. Confirm lead-free status and RoHS compliance requirements against the datasheet specifications. Ensure the selected part matches the required temperature grade and access time parameters for the target application environment.

Selection Notes

Select this component when a small-capacity, single-bit wide memory solution is required for high-reliability environments. The ceramic package offers superior thermal stability compared to plastic variants. Verify that the system design accommodates the asynchronous interface timing and three-state output requirements.

Part Context

The 4720B series represents a line of standard static random-access memories designed for general-purpose digital applications. These devices are characterized by low power consumption and compatibility with standard logic families. The CDIP variant specifically targets industrial and military applications requiring robust physical packaging.

Replacement Considerations

The 4720BXDM is a plastic DIP equivalent. Cross-reference pinouts and electrical characteristics before substitution.