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Product Detailed Parameters
- Description：27S191DM/B
- Series：-
- Mfr：Rochester Electronics, LLC
- Package：Bulk
- Memory Type：-
- Memory Format：-
- Technology：-
- Memory Size：-
- Memory Organization：-
- Memory Interface：-
- Clock Frequency：-
- Write Cycle Time - Word, Page：-
- Voltage - Supply：-
- Operating Temperature：-
- Mounting Type：-
- Package / Case：-
- Supplier Device Package：-
- Access Time：-
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Overview
The 27S191DM/B is a 2048 x 8 One-Time Programmable Read-Only Memory (OTP ROM) manufactured by Rochester Electronics, LLC. This component utilizes bipolar technology and features asynchronous operation with 3-state outputs. It is housed in a 32-pin Ceramic Quad Flat Package (CQCC32), also identified as LCC-32. The device operates within a temperature range of -55°C to +125°C and has a maximum access time of 35 ns.
Feature Summary
- Provides non-volatile storage for fixed program data using one-time programmable architecture
- Features high-speed bipolar logic for rapid asynchronous data retrieval
- Includes 3-state output buffers for direct system bus interfacing
Applications
- Embedded firmware storage in legacy industrial control systems
- Microcontroller boot code retention in older computer architectures
- Fixed logic replacement in specialized telecommunications equipment
Procurement Notes
Verify the specific suffix 'DM/B' against the original manufacturer datasheet to confirm pinout compatibility and package dimensions. Ensure the ceramic LCC-32 package matches the target PCB footprint. Confirm that the OTP nature of the device aligns with the application's requirement for permanent, unchangeable data storage rather than reprogrammable memory types.
Selection Notes
Select this component when a legacy bipolar PROM interface is required for fixed code storage. The 2Kx8 density suits applications needing moderate program capacity. Consider the ceramic package for environments requiring robust thermal stability and hermetic sealing. Verify voltage levels and timing constraints against the host system's specifications before integration.
Part Context
Rochester Electronics specializes in sustaining obsolete semiconductor products. The 27S191DM/B is part of the AMD AM27S191 family, originally designed as a high-performance OTP ROM. Rochester ensures continued availability through licensed production and rigorous testing, supporting systems that rely on discontinued components.
Replacement Considerations
Direct substitutes include the AMD AM27S191DM/B. Verify functional equivalence regarding access times and output drive strength. Alternative packages may require adapter solutions if the original footprint is unavailable.
