Winbond Electronics Corporation W9864G2JH-6I

Overview

W9864G2JH-6I from Winbond is a 512K × 4 banks × 32-bit synchronous DRAM (SDRAM) operating at 166 MHz with CAS Latency 3, 3.3V ±0.3V supply, and industrial temperature range (−40°C to +85°C), used as main memory in embedded controllers and legacy industrial systems requiring burst-access memory with LVTTL interface.

For engineers reviewing the W9864G2JH-6I datasheet, W9864G2JH-6I pinout, W9864G2JH-6I application, or W9864G2JH-6I equivalent, key selection criteria include TSOP-II-86 package compatibility, 4K/64ms refresh requirement, programmable burst length (1–8), self-refresh current ≤2 mA, and bank interleaving support for latency hiding in real-time control firmware.

Technical Context

This SDRAM implements four independent 512K×32-bit banks with row/column address multiplexing via A0–A10 and BS0/BS1, supporting sequential or interleave burst addressing modes controlled by the Mode Register. It uses LVTTL-compatible inputs and separate VDDQ/VSSQ rails for I/O noise immunity.

Functional operation relies on command decoding synchronized to CLK rising edges, with CKE-gated power-down and self-refresh entry, and auto-precharge triggered by A10 high during read/write. All banks must be precharged before Mode Register Set, and eight CBR refresh cycles are required post-initialization.

Key Specifications

Pinout & Package

W9864G2JH-6I is packaged in a RoHS-compliant, lead-free 86-pin TSOP II (Thin Small Outline Package, Type II) with standard 0.5 mm pitch and 12.0 mm × 20.0 mm body dimensions.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar SDRAM applications.

Compared with IS42S16400J-6BLI and MT48LC4M32B2P-6A:J, W9864G2JH-6I offers native 32-bit bus alignment and Winbond's documented industrial qualification path, reducing firmware porting effort and enabling drop-in replacement on existing TSOP-II-86 footprints designed for 32-bit SDR SDRAM interfaces.

Availability

W9864G2JH-6I is available at Aetrix Electronics and suitable for industrial PLCs, legacy medical devices, automotive body control modules, and point-of-sale terminals requiring stable component supply across extended product lifecycles.

Supply support for W9864G2JH-6I includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Winbond Electronics is a Taiwan-based semiconductor company specializing in specialty memory and microcontrollers, with over 30 years of DRAM design heritage and global manufacturing scale.

W9864G2JH-6I belongs to Winbond's legacy SDR SDRAM product line, engineered for cost-sensitive, long-lifecycle industrial and embedded applications where pin compatibility, temperature robustness, and firmware stability outweigh bandwidth demands of modern DDR interfaces.

FAQ

What is the maximum operating frequency and CAS latency of the W9864G2JH-6I?

The W9864G2JH-6I is rated for a maximum clock frequency of 166 MHz with CAS Latency 3. This means the device requires exactly three clock cycles between issuing a column address strobe (CAS) and the appearance of valid data on DQ pins. The -6I suffix specifically denotes industrial-grade qualification at this speed grade, with guaranteed timing performance across the full −40°C to +85°C temperature range. No overclocking or CL2 operation is supported.

Does the W9864G2JH-6I support both sequential and interleave burst modes?

Yes, the W9864G2JH-6I supports both sequential and interleave burst addressing modes, which are selected via the Mode Register during initialization. Sequential mode increments column addresses linearly (e.g., n, n+1, n+2), while interleave mode toggles specific address bits (A0, A1, A2 depending on burst length) to optimize access patterns for certain cache architectures. The W9864G2JH-6I implements this using internal address counters and does not require external logic to generate interleaved sequences.

What is the refresh requirement for the W9864G2JH-6I, and how is it implemented?

The W9864G2JH-6I requires 4,096 refresh cycles every 64 ms, equating to one refresh command every 15.625 µs on average. Refresh is implemented via externally initiated Auto-Refresh (CBR) commands issued by the memory controller, or internally during Self-Refresh mode when CKE is held low. During Self-Refresh, the W9864G2JH-6I uses an internal oscillator to autonomously issue refresh cycles without external clock or command input, drawing ≤2 mA current.

Can the W9864G2JH-6I be used in a 16-bit data bus configuration?

No, the W9864G2JH-6I is a fixed 32-bit wide device with 32 dedicated DQ pins (DQ0–DQ31) and no configurable bus width. It cannot be operated in 16-bit mode without external data masking or truncation, which would violate timing and functionality requirements. Systems requiring 16-bit SDRAM must select a part with native 16-bit organization (e.g., x16) such as IS42S16400J-6BLI, which has different pinout, bank structure, and initialization behavior than the W9864G2JH-6I.

What package type and pin count does the W9864G2JH-6I use?

The W9864G2JH-6I uses an 86-pin TSOP II (Thin Small Outline Package, Type II) with 0.5 mm pitch, measuring 12.0 mm × 20.0 mm. It is lead-free and RoHS compliant. Pin functions include 32 data lines (DQ0–DQ31), four data masks (DQM0–DQM3), eleven address lines (A0–A10), two bank selects (BS0, BS1), four command inputs (CS, RAS, CAS, WE), plus CLK, CKE, VDD, VSS, VDDQ, VSSQ, and NC pins - all matching JEDEC-standard SDR SDRAM TSOP-II mechanical and electrical specifications.