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Product Detailed Parameters
- Description：OTP ROM, 256X4, 60NS, TTL
- Series：-
- Mfr：Rochester Electronics, LLC
- Package：Bulk
- Memory Type：-
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- Write Cycle Time - Word, Page：-
- Voltage - Supply：-
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- Mounting Type：-
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- Supplier Device Package：-
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Overview
The 27S21ADM/B is a one-time programmable read-only memory (OTP ROM) integrated circuit manufactured by Rochester Electronics, LLC. It features a storage capacity of 256 words by 4 bits, providing a total of 1024 bits of non-volatile data retention. The device operates with a maximum access time of 60 nanoseconds and supports TTL logic levels for input and output compatibility. It is housed in a standard plastic dual in-line package suitable for through-hole mounting applications.
Feature Summary
- Non-volatile OTP ROM architecture for permanent data storage
- TTL-compatible logic levels for direct interface with digital systems
- High-speed 60ns access time for efficient data retrieval
Applications
- Embedded system configuration storage
- Microcontroller boot code storage
- Fixed lookup table implementation in digital circuits
Procurement Notes
Verify the specific lot date code and manufacturer origin when sourcing from authorized distributors like Rochester Electronics. Confirm that the OTP status remains unprogrammed if new stock is required. Ensure the package type matches the target PCB footprint to avoid assembly issues during integration.
Selection Notes
Select this component when fixed, non-volatile data storage is required without the complexity of EEPROM or Flash programming cycles. The TTL compatibility simplifies interface design with legacy or standard digital logic families. Consider the 60ns speed sufficient for low-to-moderate frequency control applications.
Part Context
This part belongs to the 27S21 series of OTP ROMs, widely used in industrial and consumer electronics for storing firmware or calibration data. Rochester Electronics acts as an authorized source for discontinued or lifecycle-managed semiconductor components, ensuring supply continuity for long-term production designs.
Replacement Considerations
MIC2027-1YWM is listed as a direct substitute by the distributor, though it is a power switch IC rather than memory. Verify functional equivalence carefully as pinouts and electrical characteristics may differ significantly between memory and power management devices.
