Winbond Electronics Corporation W632GU8NB15I

Overview

W632GU8NB15I from Winbond Electronics is a 2 Gb (256 MB) DDR3L SDRAM organized as 32M × 8 banks × 8 bits, operating at 1.35 V nominal supply with DDR3L-1333 speed grade (9-9-9 CL-tRCD-tRP), rated for -40°C to +95°C industrial temperature range, and packaged in 78-ball VFBGA (8 mm × 10.5 mm). It serves as main memory or buffer storage in embedded controllers, network edge devices, and industrial HMIs requiring low-voltage, high-reliability DRAM.

For engineers reviewing the W632GU8NB15I datasheet, W632GU8NB15I pinout, W632GU8NB15I application, or W632GU8NB15I equivalent, this page delivers verified timing parameters, industrial-grade thermal validation, ODT configuration options, ZQ calibration support, and DDR3L-1333-specific CAS Write Latency (CWL = 5–7) and CAS Latency (CL = 5–10) settings confirmed for the -15I speed bin.

Technical Context

This DDR3L SDRAM implements an 8-bit prefetch architecture with eight internal banks enabling concurrent access, DLL-aligned DQ/DQS timing, and source-synchronous differential strobe (DQS/DQS#) I/O. It supports programmable additive latency (AL = 0, CL−1, CL−2), posted CAS, auto-precharge, and asynchronous RESET# for deterministic power-up initialization.

Key functional capabilities include ZQ calibration for output driver and ODT impedance tuning, dynamic ODT (Rtt_WR) during writes, Multi-Purpose Register (MPR) for system-level timing calibration, and write leveling for per-lane skew compensation - all validated for the W632GU8NB15I's -15I industrial temperature grade and DDR3L-1333 timing bin.

Key Specifications

Pinout & Package

VFBGA-78 package (8 mm × 10.5 mm, 1.0 mm thickness) with ball pitch of 0.8 mm; RoHS-compliant, lead-free construction.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar DDR3L SDRAM applications.

Compared with MT41K256M8RH-125:E and IS43TR16256B-125KBL, the W632GU8NB15I uniquely guarantees full DDR3L-1333 timing compliance up to +95°C case temperature with JEDEC-specified tREFI halving, uses an 8-bit bus optimized for cost-sensitive controllers, and features Winbond's validated ZQ calibration flow for simplified signal integrity tuning.

Availability

W632GU8NB15I is available at Aetrix Electronics and suitable for industrial HMI systems, network edge routers, medical diagnostic terminals, and smart energy gateways requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for W632GU8NB15I 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 manufacturer specializing in specialty memory solutions, including NOR/NAND Flash, SRAM, and DRAM products for industrial, automotive, and communications markets.

The W632GU8NB15I belongs to Winbond's DDR3L SDRAM product line, designed specifically for cost-optimized, thermally robust embedded systems where low-voltage operation, industrial temperature support, and JEDEC-compliant timing stability are mandatory.

FAQ

What is the maximum operating frequency and CAS latency supported by the W632GU8NB15I?

The W632GU8NB15I is a DDR3L-1333 speed grade device with a maximum clock frequency of 667 MHz (1333 MT/s). It supports CAS Latency (CL) values of 5, 6, 7, 8, 9, and 10, all validated across its full -40°C to +95°C industrial temperature range per JEDEC specification. The W632GU8NB15I does not support CL=11, 13, or 14 - those are reserved for faster speed bins like -09I or -11I.

Does the W632GU8NB15I support both 1.35 V and 1.5 V operation?

Yes, the W632GU8NB15I supports dual-voltage operation: it is fully compliant with DDR3L specifications at 1.35 V (VDD/VDDQ = 1.283 V to 1.45 V) and backward compatible with standard DDR3 at 1.5 V ± 0.075 V. This allows seamless migration from legacy 1.5 V systems while maintaining JEDEC timing compliance in either mode - no hardware changes required beyond supply rail adjustment.

How does ZQ calibration work on the W632GU8NB15I, and what external component is required?

ZQ calibration on the W632GU8NB15I uses a single external 240 Ω ±1% precision resistor connected between the ZQ pin and VSS to calibrate both output driver strength and on-die termination (ODT) impedances. The device executes ZQ calibration commands (ZQCL at power-up, ZQCS during operation) to adjust internal current sources, ensuring consistent signal integrity across voltage and temperature variations - a critical feature for reliable high-speed DDR3L operation.

What is the purpose of the Multi-Purpose Register (MPR) in the W632GU8NB15I?

The Multi-Purpose Register (MPR) in the W632GU8NB15I stores a predefined 128-bit calibration pattern used during system initialization to verify timing margins and perform write leveling. When enabled via MR3, the MPR outputs this fixed pattern on DQ pins during READ commands, allowing host controllers to detect strobe-to-data skew and adjust delay settings - a key step in achieving robust DDR3L-1333 timing closure on production boards.

Is the W632GU8NB15I pin-compatible with other Winbond DDR3L parts like the W632GU8NB-15 or W632GU8NB15J?

Yes, the W632GU8NB15I shares identical VFBGA-78 pinout, ball assignment, and electrical interface with all members of the W632GU8NB family, including W632GU8NB-15 (commercial grade) and W632GU8NB15J (industrial-plus grade). Differences lie solely in temperature rating (-40°C to +95°C for W632GU8NB15I vs. +105°C for W632GU8NB15J) and associated AC parameter validation - no PCB changes are needed for substitution within the same speed bin.