W9825G6KB-6I

Memory IC Overview

The W9825G6KB-6I is a high-speed synchronous dynamic random access memory (SDRAM) manufactured by Winbond Electronics. It features a memory organization of 4M words x 4 banks x 16 bits, delivering up to 166 MHz clock frequency and 166M words per second data bandwidth. The component operates on a 3.3V ± 0.3V power supply with LVTTL interface. It supports CAS latencies of 2 and 3, burst lengths of 1, 2, 4, 8, and full page, and includes standard and low-power self-refresh modes. The -6I grade guarantees operation within an industrial temperature range of -40°C to 85°C.

Memory IC Feature Summary

• Supports interleaved bank operations to hide precharging time for seamless data access across multiple pages.
• Features programmable mode register allowing system configuration of burst length, latency cycle, and interleave or sequential burst types.
• Includes auto-precharge and controlled precharge capabilities to manage bank states efficiently.
• Provides byte-level data control via LDQM and UDQM pins for precise input/output masking.

Memory IC Applications

• Main memory in high-performance computing applications
• Industrial embedded systems requiring wide operating temperatures
• Personal computer memory modules

Memory IC Procurement Notes

Verify the specific speed grade suffix (-6I) matches the required operational temperature range of -40°C to 85°C. Confirm package compatibility with the 54-ball TFBGA footprint during PCB design. Check for recent Product Change Notifications (PCN) regarding manufacturing updates. Ensure voltage levels align with the 3.3V ± 0.3V specification before integration.

Memory IC Selection Notes

Select this component when a 256Mb capacity with 16-bit width is required for SDRAM applications. The -6I variant is suitable for environments demanding industrial temperature stability. Consider the 54-ball TFBGA package for space-constrained designs. Verify that the host controller supports the necessary initialization sequences, including power-up pauses and mode register programming.

Memory IC Part Context

This part belongs to the W9825G6KB series, which includes variants sorted into speed grades -6, -6I, and -6J. The series complies with personal computer industrial standards. Other members share the same 4M x 4 Banks x 16 Bits organization but differ in guaranteed operating temperatures and maximum clock frequencies.

Memory IC Replacement Considerations

Check datasheets for alternative SDRAM parts offering identical 16-bit width and 256Mb capacity. Verify pinout compatibility with the 54-ball TFBGA package. Ensure replacement components support the required 166MHz speed grade and industrial temperature range if applicable.

Memory IC FAQ

What is the initialization sequence required after power up?

After power up, an initial pause of 200 µS is required followed by a precharge of all banks. Then, the Mode Register Set Command must be issued, followed by eight Auto Refresh cycles to ensure proper operation.

How does the device handle burst read interruptions?

A Burst Read may be interrupted by another Read Command. When interrupted, the remaining addresses are overridden by the new read address with the full burst length, while data from the first command continues until the CAS Latency of the interrupting command is satisfied.