Winbond Electronics Corporation W632GG8NB12I TR

Overview

W632GG8NB12I TR 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 range (−40°C to +95°C), 1.5 V core/I/O supply, and VFBGA-78 (8 mm × 10.5 mm) packaging. It serves as main system memory in embedded controllers, networking processors, and industrial HMIs requiring high-bandwidth, low-latency data buffering.

For engineers reviewing the W632GG8NB12I TR datasheet, W632GG8NB12I TR pinout, W632GG8NB12I TR application, or W632GG8NB12I TR equivalent, key selection criteria include CAS latency support (CL = 5–11), programmable CWL (5–8), on-die termination (RTT_NOM/RTT_WR), ZQ calibration, and industrial-grade thermal reliability under sustained burst read/write loads.

Technical Context

This DDR3 SDRAM implements an 8-bit prefetch architecture with eight internal banks for concurrent access, differential CK/CK# and DQS/DQS# signaling, and DLL-based alignment of DQ and DQS edges to CK. It supports posted CAS with additive latency (AL = 0, CL−1, CL−2), enabling efficient command bus utilization during high-throughput transfers.

Functional operation includes synchronous reset via RESET#, auto-precharge on read/write bursts, multiple power-down modes (precharged/active), and dynamic ODT control via MR1/MR2. Calibration features-ZQ, write leveling, and MPR-enable system-level timing convergence across trace-mismatched PCB layouts.

Key Specifications

Pinout & Package

VFBGA-78 package with 8×10.5 mm² body, 1.0 mm thickness, lead-free and RoHS-compliant construction. Ball pitch: 0.8 mm. Compatible with standard DDR3 layout guidelines including controlled-impedance routing and ground plane partitioning.

Key Features

Applications

Equivalent & Alternatives

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

Compared with W632GG8NB12I TR, MT41K256M8RH-125:E offers identical performance but demands layout revision and lacks advanced calibration features, while IS43TR16256B-125KBL trades pin compatibility and feature depth for lower voltage operation and doubled data width-making W632GG8NB12I TR optimal for drop-in industrial upgrades requiring proven DDR3-1600 reliability and full JEDEC feature support.

Availability

W632GG8NB12I TR is available at Aetrix Electronics and suitable for industrial HMIs, networking processors, embedded vision systems, and medical imaging equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for W632GG8NB12I TR 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 W632GG8NB series targets cost-sensitive, thermally demanding embedded applications requiring JEDEC-compliant DDR3 performance with enhanced calibration and power management features not found in commodity SDRAM.

FAQ

What is the maximum supported CAS latency for W632GG8NB12I TR at DDR3-1600 speed?

W632GG8NB12I TR supports CAS latency settings from CL=5 through CL=11 at DDR3-1600 speed. CL=11 corresponds to a minimum t_AA of 13.75 ns at 800 MHz clock frequency, meeting JEDEC DDR3-1600 (11-11-11) timing requirements. This setting is commonly selected to maximize timing margin in thermally stressed or electrically noisy environments where W632GG8NB12I TR operates.

Does W632GG8NB12I TR require an external resistor for ZQ calibration?

Yes, W632GG8NB12I TR requires a precision 240 Ω ±1% external resistor connected between ZQ pin and VSS to perform output driver and ODT impedance calibration. This resistor must be placed within 5 mm of the W632GG8NB12I TR ball and use low-inductance layout practices; omission or incorrect value causes persistent signal integrity issues and failed write leveling during W632GG8NB12I TR initialization.

Can W632GG8NB12I TR operate in self-refresh mode at +95°C case temperature?

Yes, W632GG8NB12I TR supports self-refresh operation across its full industrial temperature range (−40°C to +95°C). At +95°C, it requires either Manual Self-Refresh with Extended Temperature Range enabled (MR2[7:6] = 0b10) or Auto Self-Refresh (ASR) mode (MR2[7:6] = 0b11) to double refresh rate (tREFI = 3.9 µs), ensuring data retention without external refresh commands while maintaining IDD6 ≤ 15 mA.

What is the function of the MPR in W632GG8NB12I TR and how is it accessed?

The Multi-Purpose Register (MPR) in W632GG8NB12I TR stores a fixed 128-bit pattern (0x00000000) used for system-level timing calibration. It is accessed by setting MPR enable bit (MR3[0]) and issuing a READ command to address 0x000; the pattern appears on DQ pins synchronized to DQS. This allows the controller to measure DQS-to-DQ skew and adjust delays during W632GG8NB12I TR initialization without requiring external test equipment.

How does dynamic ODT (Rtt_WR) improve signal integrity in W632GG8NB12I TR designs?

Dynamic ODT in W632GG8NB12I TR activates on-die termination only during WRITE operations (via MR2[6:4]), reducing stub reflections on DQ/DQS lines when the DRAM is driving data. This improves write eye opening and timing margin without loading the bus during READs, where termination is handled by the controller's ODT. Proper Rtt_WR selection (e.g., 60 Ω or 120 Ω) based on trace impedance is essential for robust W632GG8NB12I TR operation above 800 MHz.