Winbond Electronics Corporation W972GG6JB-3I

Overview

W972GG6JB-3I from Winbond Electronics is a 2 Gb (128 M × 16) DDR2 SDRAM organized as 16M words × 8 banks × 16 bits, operating at DDR2-667 speed (5-5-5 timing), with 1.8 V ± 0.1 V core and I/O supply, -40°C to +95°C industrial temperature range, and WBGA-84 (11 mm × 13 mm) package. It serves as main system memory in embedded controllers, industrial HMIs, and network edge devices requiring reliable high-density synchronous DRAM.

For engineers reviewing the W972GG6JB-3I datasheet, W972GG6JB-3I pinout, W972GG6JB-3I application, or W972GG6JB-3I equivalent, key selection considerations include its industrial-grade thermal rating, ODT and OCD impedance control for signal integrity, DLL-aligned DQS/DQ timing, SSTL_18 interface compliance, and support for posted CAS, auto-precharge, and self-refresh modes.

Technical Context

This DDR2 SDRAM implements a double-data-rate architecture synchronized to differential CLK/CLK inputs, with bi-directional DQS/DQS strobes edge-aligned on reads and center-aligned on writes. Its internal DLL aligns DQ and DQS transitions to clock edges, enabling stable 333 MHz operation (tCK = 3.0 ns min at CL=5).

The device supports programmable CAS latency (CL = 3–7), additive latency (AL = 0–2), burst lengths of 4 or 8, and on-die termination (ODT) with configurable drive strength via extended mode registers. Command decoding uses CS, RAS, CAS, WE, and BA0–BA2, with address A0–A13 and bank-select inputs fully registered on clock crossings.

Key Specifications

Pinout & Package

W972GG6JB-3I is housed in an 84-ball WBGA package (11 mm × 13 mm, 0.8 mm pitch) with separate VDD/VDDQ and VSS/VSSQ power domains, dedicated DLL supply (VDDL) and ground (VSSDL), and differential clock (CLK/CLK), strobe (UDQS/UDQS, LDQS/LDQS), and command (CS, RAS, CAS, WE) balls. Ball layout follows JEDEC-standard DDR2 SDRAM pinout with A0–A13, BA0–BA2, DQ0–DQ15, ODT, CKE, VREF, and NC positions.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar DDR2 SDRAM applications.

Compared with MT47H128M16HR-3IT:F and IS42S16160F-3BLI, W972GG6JB-3I offers superior signal integrity via differential DQS, full OCD calibration, and explicit DLL control - making it the preferred choice for new industrial designs demanding robustness across voltage, temperature, and board-level noise.

Availability

W972GG6JB-3I is available at Aetrix Electronics and suitable for industrial HMIs, network edge routers, medical imaging controllers, and smart energy gateways requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for W972GG6JB-3I 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 DDR SDRAM for industrial, automotive, and communications markets.

The W972GG6JB series belongs to Winbond's industrial-grade DDR2 SDRAM product line, designed specifically for embedded systems requiring extended temperature operation, high reliability, and JEDEC-compliant timing under real-world PCB and power delivery conditions.

FAQ

What is the maximum operating frequency of the W972GG6JB-3I?

The W972GG6JB-3I is rated for DDR2-667 operation, supporting a maximum clock frequency of 333 MHz (tCK = 3.0 ns minimum at CAS Latency 5). It meets JEDEC specification 5-5-5 timing and is not qualified for higher-speed grades like DDR2-800 or DDR2-1066. The device achieves this performance with guaranteed operation from -40°C to +95°C case temperature, provided tREFI is reduced to 3.9 µS above 85°C.

Does the W972GG6JB-3I support differential DQS signaling?

Yes, the W972GG6JB-3I supports differential DQS signaling via UDQS/UDQS and LDQS/LDQS pins. This mode is enabled by setting bit A10 in the Extended Mode Register 1 (EMR(1)) using an EMRS command. When active, differential strobes improve jitter tolerance and timing margin - especially critical in industrial environments with EMI or longer trace lengths. Single-ended DQS operation remains available as fallback.

How is On-Die Termination (ODT) controlled on the W972GG6JB-3I?

ODT on the W972GG6JB-3I is controlled by the dedicated ODT pin (Ball K9), which must be driven HIGH to enable internal termination resistors on DQ and DQS lines. Termination values (75 Ω or 150 Ω) are configured via EMR(1) bits A1–A0. Unlike some DDR2 devices, ODT state is not mode-register controlled - it is purely pin-driven, simplifying timing-critical enable/disable sequencing during read/write bursts.

What is the purpose of the VDDL and VSSDL pins on the W972GG6JB-3I?

VDDL (Ball J1) and VSSDL (Ball J7) are dedicated power and ground supplies for the internal Delay-Locked Loop (DLL). Isolating the DLL's power domain minimizes noise coupling from digital I/O switching into the clock alignment circuitry, preserving DQ–DQS phase accuracy. These pins must be decoupled locally with 100 nF ceramic capacitors and routed separately from VDD/VSS to maintain DLL stability across temperature and voltage variations.

Can the W972GG6JB-3I operate without OCD calibration?

Yes, the W972GG6JB-3I can operate without performing OCD calibration. If skipped, the device defaults to factory-trimmed drive strength by issuing EMRS to EMR(1) with A9=A8=A7=HIGH (enter calibration default), then A9=A8=A7=LOW (exit calibration mode). However, skipping OCD may reduce timing margin in high-noise or marginal PCB layouts; Winbond recommends calibration during system initialization for optimal signal integrity in industrial applications.