CY7C1440KV33-250AXC

Memory IC Overview

The CY7C1440KV33-250AXC is a 36-Mbit (1M × 36) Pipelined Synchronous SRAM featuring on-chip ECC. It supports bus operations up to 250 MHz with a maximum clock-to-output time of 2.5 ns. The device utilizes registered inputs and outputs for pipelined operation, providing a high-performance 3-1-1-1 access rate. It operates from a 3.3 V core power supply with 2.5 V or 3.3 V I/O options. Key features include user-selectable burst sequences, separate processor and controller address strobes, synchronous self-timed writes, and an asynchronous output enable.

Memory IC Feature Summary

• On-chip error correction code (ECC) detects and corrects single-bit memory errors to reduce soft error rates.
• Registered inputs and outputs enable pipelined operation with fast clock-to-output timing.
• User-selectable burst counter supports both interleaved and linear burst sequences.
• Separate processor and controller address strobes allow flexible system integration.

Memory IC Applications

• Secondary cache systems in Pentium-based processors
• High-performance embedded systems requiring low latency
• Network infrastructure equipment demanding data integrity

Memory IC Procurement Notes

Verify the specific speed grade and package type against the datasheet ordering information. Confirm that the ECC functionality is required, as non-ECC variants exist within the same family. Ensure voltage levels match the 3.3 V core and 2.5/3.3 V I/O specifications. Check for availability of the 100-pin TQFP or 165-ball FBGA packages depending on design constraints.

Memory IC Selection Notes

Select this component when single-bit error correction is critical for system reliability. Choose the 250 MHz grade for maximum throughput requirements. Consider the 1M × 36 organization for wide data path applications. Verify compatibility with the target processor's burst sequence requirements (interleaved vs. linear). Ensure the PCB layout supports the selected package type and JTAG interface if boundary scan testing is needed.

Memory IC Part Context

This part belongs to the Cypress CY7C1440KV33/CY7C1442KV33/CY7C1440KVE33 family of 36-Mbit Pipelined Sync SRAMs. It shares architectural similarities with other members like the CY7C1442KV33 but differs in data width and ECC implementation. The family is designed for high-speed synchronous memory applications requiring robust data integrity and flexible burst modes.

Memory IC Replacement Considerations

CY7C1442KV33-250AXC offers similar performance but with a 2M x 18 organization and no ECC. CY7C1440KVE33 provides the same 1M x 36 organization with ECC but may have different packaging or speed grades. Verify electrical characteristics and pin compatibility before substitution.

Memory IC FAQ

How does the on-chip ECC function?

The on-chip ECC algorithm detects and corrects all single-bit memory errors, including those induced by cosmic rays or alpha particles, significantly reducing the soft error rate.

What burst sequences are supported?

The device supports both interleaved and linear burst sequences, which are user-selectable via the MODE input pin.

Can the JTAG feature be disabled?

Yes, the JTAG feature can be disabled by tying the TCK pin LOW to prevent clocking of the TAP controller.