Winbond Electronics Corporation W632GU8NB-11

Overview

W632GU8NB-11 from Winbond Electronics is a 2Gb (256M × 8) DDR3L SDRAM organized in 8 banks, supporting DDR3L-1866 speed grade (13-13-13 timing), 1.35V nominal VDD/VDDQ operation, and industrial temperature range (0°C to 95°C). It delivers 1866 MT/s data rates with programmable CAS Latency (CL = 5–11), CWL = 5–9, and on-die termination for high-speed memory subsystems in networking and embedded computing.

For engineers reviewing the W632GU8NB-11 datasheet, W632GU8NB-11 pinout, W632GU8NB-11 application, or W632GU8NB-11 equivalent, key selection considerations include its DDR3L-1866 timing compliance, VFBGA-78 package, ZQ calibration support, asynchronous RESET# functionality, and compatibility with JEDEC-standard DDR3L controllers requiring low-voltage memory with dynamic ODT and write leveling.

Technical Context

This DDR3L SDRAM implements an 8-bit prefetch architecture synchronized to differential CK/CK# clocks, with inputs latched at the crossing point and bidirectional DQS/DQS# strobes edge-aligned on reads and center-aligned on writes. Its DLL aligns DQ and DQS transitions to CK, enabling precise timing control across process/voltage/temperature variations.

The device supports full DDR3L feature set including programmable mode registers (MR0–MR3), multi-purpose register (MPR) for system-level timing calibration, write leveling for DQ-DQS skew compensation, and dynamic ODT (Rtt_WR) with selectable termination impedances during write operations - all critical for stable high-speed memory interface design.

Key Specifications

Pinout & Package

VFBGA-78 package with 8×10.5 mm² footprint, 1.0 mm thickness, and window-type ball layout optimized for signal integrity and thermal performance in space-constrained applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MT41K256M8DA-125:K and IS43TR16256B-125KBL, the W632GU8NB-11 provides higher DDR3L-1866 throughput, full JEDEC write leveling and MPR support for robust system timing validation, and native 8-bit bus alignment - making it optimal for bandwidth-constrained, calibration-sensitive embedded systems where pinout and timing fidelity are critical.

Availability

W632GU8NB-11 is available at Aetrix Electronics and suitable for networking equipment, industrial HMI, medical imaging systems, and video surveillance DVR/NVR requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature operation.

Supply support for W632GU8NB-11 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.

The W632GU8NB-11 belongs to Winbond's DDR3L SDRAM product line, designed specifically for cost-sensitive, power-efficient embedded systems requiring JEDEC-compliant low-voltage memory with advanced calibration and termination features.

FAQ

What is the maximum data rate supported by the W632GU8NB-11?

The W632GU8NB-11 supports DDR3L-1866 operation with a maximum data transfer rate of 1866 MT/s. This corresponds to a clock frequency of 933 MHz (tCK = 1.07 ns minimum), compliant with JEDEC specification CL-13, tRCD-13, tRP-13 timing. The part achieves this rate under 1.35 V supply and 0°C to 95°C case temperature conditions, as validated in its -11 speed grade characterization.

Does the W632GU8NB-11 support both 1.35 V and 1.5 V operation?

Yes, the W632GU8NB-11 is fully backward compatible with standard DDR3 1.5 V operation (VDD/VDDQ = 1.5 V ± 0.075 V), while being optimized for DDR3L 1.35 V operation (VDD/VDDQ = 1.283 V to 1.45 V). This dual-voltage capability allows seamless migration from legacy DDR3 systems and simplifies design reuse across platforms with mixed voltage requirements.

How does the W632GU8NB-11 implement on-die termination (ODT)?

The W632GU8NB-11 supports synchronous, dynamic, and asynchronous ODT modes via MR1 and MR2 configuration. It offers programmable Rtt_Nom values (60 Ω, 120 Ω, 40 Ω) and dynamic Rtt_WR (60 Ω, 120 Ω) activated only during write bursts. ODT is controlled by the ODT pin and calibrated using the ZQ pin and external 240 Ω reference resistor - ensuring impedance matching across voltage and temperature variations.

What is the purpose of the Multi-Purpose Register (MPR) in the W632GU8NB-11?

The MPR in the W632GU8NB-11 stores a predefined 128-bit calibration bit sequence used for system-level timing margin analysis. Accessed via mode register set (MRS) command, the MPR enables readback of a known pattern to verify DQ-DQS alignment, validate write leveling results, and assess signal integrity without requiring external test patterns - accelerating board bring-up and production validation.

Can the W632GU8NB-11 operate reliably at 95°C case temperature?

Yes, the W632GU8NB-11 is rated for 0°C ≤ TCASE ≤ 95°C operation and maintains full JEDEC AC/DC specifications across this range. At temperatures above 85°C, it requires doubled auto-refresh frequency (tREFI = 3.9 µs) - achieved either by enabling Auto Self-Refresh (ASR) via MR2 or by issuing manual refresh commands. This ensures data retention integrity under extended thermal stress.