Winbond Electronics Corporation W632GG8NB12I

Overview

W632GG8NB12I from Winbond is a 2 Gb (256 MB) DDR3 SDRAM organized as 32M × 8 banks × 8 bits, operating at DDR3-1600 speed (800 MHz clock, 11-11-11 timing), with industrial temperature support (–40°C to +95°C), 1.5 V supply, and VFBGA-78 package. It serves as main system memory in embedded controllers, network processors, and industrial HMIs requiring reliable high-bandwidth data buffering.

For engineers reviewing the W632GG8NB12I datasheet, W632GG8NB12I pinout, W632GG8NB12I application, or W632GG8NB12I equivalent, key selection criteria include CAS Latency (CL = 11), programmable CWL (5–8), ZQ calibration support, on-die termination (RTT_NOM/RTT_WR), and industrial-grade thermal stability across power-down and self-refresh modes.

Technical Context

This DDR3 SDRAM implements an 8-bit prefetch architecture with eight internal banks for concurrent access, synchronized by differential CK/CK# clocks and source-synchronous DQS/DQS# strobes. It supports posted CAS with additive latency (AL = 0, CL−1, CL−2), enabling efficient command bus utilization during burst reads.

The device integrates asynchronous RESET#, dynamic ODT (Rtt_WR), multi-purpose register (MPR) for timing calibration, and write leveling for DDR3 interface alignment. All timing parameters-including tRCD = 13.75 ns, tRP = 13.75 ns, and tAA = 13.75 ns-are guaranteed under industrial temperature and DDR3-1600 conditions per JEDEC JESD79-3F.

Key Specifications

Pinout & Package

VFBGA-78 package (8 mm × 10.5 mm, 1.0 mm thickness, 0.8 mm ball pitch) with window-type construction and lead-free, RoHS-compliant materials. Ball layout follows JEDEC MO-255 standard for DDR3 SDRAM.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar DDR3 SDRAM applications.

Compared with MT41K256M8DA-125:A and IS43TR16256B-125KBL, W632GG8NB12I uniquely combines industrial temperature range, PASR, ASR, and native x8 interface in VFBGA-78-making it optimal for space-constrained, thermally demanding embedded systems where power-aware memory control is mandatory.

Availability

W632GG8NB12I is available at Aetrix Electronics and suitable for industrial HMIs, network processors, medical imaging controllers, and automated test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for W632GG8NB12I 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 solutions, including NOR/NAND Flash, SRAM, and DRAM products for industrial, automotive, and communications markets.

W632GG8NB12I belongs to Winbond's W632GG8NB DDR3 SDRAM product line, designed specifically for high-reliability embedded applications demanding industrial temperature operation, low-power self-refresh modes, and JEDEC-compliant signal integrity.

FAQ

What is the maximum clock frequency supported by W632GG8NB12I?

W632GG8NB12I supports a maximum clock frequency of 800 MHz (DDR3-1600), delivering 1600 MT/s data transfer rates. This is validated under industrial temperature conditions (–40°C to +95°C) with tRCD/tRP/tAA = 13.75 ns and CL = 11. The device does not support higher bins (e.g., DDR3-1866) in this speed grade.

Does W632GG8NB12I support on-die termination (ODT) and how is it configured?

Yes, W632GG8NB12I supports programmable ODT with RTT_NOM (75 Ω or 150 Ω) and dynamic RTT_WR (75 Ω or 150 Ω). Configuration is done via Mode Registers MR1 (RTT_NOM) and MR2 (Rtt_WR), with ODT enabled/disabled per command cycle. The ODT states are defined in the MR truth table and require proper timing per tODT and tZQCS specifications.

How does the write leveling function work in W632GG8NB12I?

W632GG8NB12I implements hardware-assisted write leveling: the controller asserts WL_EN via MRS, then toggles DQS while monitoring DQ feedback. The DRAM internally delays DQS launch until DQ samples match expected pattern. This compensates for board-level flight time mismatches between DQS and DQ, ensuring setup/hold compliance at 800 MHz. Exit is triggered by MRS with WL_EN = 0.

Can W632GG8NB12I operate in partial array self-refresh (PASR) mode, and what benefit does it provide?

Yes, W632GG8NB12I supports PASR via MR2 bit A4–A2, allowing refresh of ¼, ½, or all banks. When only two banks are active, PASR reduces self-refresh current from 15 mA to ~7.5 mA-cutting standby power nearly in half. This extends battery life in portable medical or field-deployed equipment without compromising data retention.

What is the purpose of the Multi-Purpose Register (MPR) in W632GG8NB12I?

The MPR in W632GG8NB12I stores a fixed 128-bit pattern (0x00000000) accessible via READ commands after MRS activation. It is used for system-level timing margin testing-controllers read the MPR pattern while varying DQS delay to measure DQ eye width and centering. This validates signal integrity before enabling full-speed operation.