Winbond Electronics Corporation W972GG8JB-3I

Overview

W972GG8JB-3I from Winbond Electronics is a 2G-bit DDR2 SDRAM organized as 32M × 8 banks × 8 bits, operating at DDR2-667 speed (5-5-5 timing), with 1.8 V ±0.1 V core and I/O supply, CAS latency 3–7 support, and on-die termination (ODT) for signal integrity in high-speed memory subsystems used in industrial embedded controllers and legacy computing platforms.

For engineers reviewing the W972GG8JB-3I datasheet, W972GG8JB-3I pinout, W972GG8JB-3I application, or W972GG8JB-3I equivalent, key selection considerations include its -3 speed grade (tCK min = 3 ns @ CL=5), industrial temperature range (-40°C to +95°C), WBGA-60 package, SSTL_18 interface compliance, and OCD/ODT programmability for impedance control in multi-drop DDR2 bus designs.

Technical Context

This DDR2 SDRAM implements a double-data-rate architecture synchronized to differential CLK/CLK inputs, with DLL-aligned DQ/DQS timing, posted CAS (AL=0–2), and bi-directional differential DQS strobes edge-aligned on read and center-aligned on write. It supports burst lengths of 4 and 8, auto-precharge, and both self-refresh and auto-refresh modes.

Command decoding uses CS, RAS, CAS, and WE with bank address BA0–BA2 and row/column address A0–A14 (A10 controls auto-precharge). ODT activation is controlled via dedicated ODT pin, while OCD calibration is performed through EMR(1) register writes using A7–A9, enabling fine-tuned off-chip driver impedance matching.

Key Specifications

Pinout & Package

W972GG8JB-3I is packaged in a 60-ball Wafer-Level Ball Grid Array (WBGA) measuring 11 mm × 11.5 mm, lead-free and RoHS compliant, with separate VDD/VDDQ/VDDL power domains and isolated VSSQ/VSSDL grounds for noise suppression.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MT47H64M8CB-3:H and IS42S16160F-3BL, W972GG8JB-3I offers optimal balance of industrial reliability, compact WBGA packaging, and full DDR2 feature set-including differential DQS and OCD calibration-without requiring layout changes or sacrificing timing margin in space-constrained embedded systems.

Availability

W972GG8JB-3I is available at Aetrix Electronics and suitable for industrial automation, medical imaging equipment, and legacy networking infrastructure requiring stable component supply with long-term lifecycle assurance.

Supply support for W972GG8JB-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 DRAM products for industrial, automotive, and consumer markets.

W972GG8JB-3I belongs to Winbond's DDR2 SDRAM product line, designed specifically for cost-sensitive, thermally demanding embedded applications where industrial temperature range and proven DDR2 interoperability are critical.

FAQ

What is the maximum clock frequency supported by W972GG8JB-3I?

W972GG8JB-3I supports a maximum clock frequency of 333 MHz, corresponding to DDR2-667 operation (667 MT/s data rate). This is confirmed by its tCK(min) = 3.0 ns at CL=5 and 3.75 ns at CL=4 per the datasheet's KEY PARAMETERS table. The -3 speed grade is explicitly rated for DDR2-667 (5-5-5) timing, and operation beyond this violates AC specifications.

Does W972GG8JB-3I support differential DQS signaling?

Yes, W972GG8JB-3I supports differential DQS signaling via dedicated DQS and DQS pins. As stated in Section 2 FEATURES and Section 6 BALL DESCRIPTION, differential strobe mode is enabled by setting EMR(1)[A10] = 0. When enabled, DQS operates edge-aligned with read data and center-aligned with write data, improving timing margin over single-ended implementations.

What is the purpose of the ODT pin on W972GG8JB-3I?

The ODT pin on W972GG8JB-3I is an active-HIGH control signal that enables on-die termination resistors internally. As documented in Section 6 BALL DESCRIPTION and Section 8.2.4, asserting ODT HIGH activates programmable termination to suppress signal reflections on the DQ/DQS bus-critical for maintaining signal integrity in multi-drop DDR2 topologies without external resistors.

How does W972GG8JB-3I handle power-down modes?

W972GG8JB-3I supports two power-down modes: Precharged Power Down and Active Power Down. Per Section 8.9, Precharged Power Down (CKE LOW, all banks precharged) reduces current to ~20 mA, while Active Power Down (CKE LOW, banks active) maintains faster wake-up but draws more current. Both modes require strict tXP and tCKE timing per Section 10.11.2 to avoid undefined behavior.

Is W972GG8JB-3I pin-compatible with other Winbond DDR2 SDRAMs like W972GG8JB-25I?

No, W972GG8JB-3I is not pin-compatible with W972GG8JB-25I despite sharing the same WBGA-60 package and ball map. While mechanical footprint and pin functions match, the -3I and -25I variants differ in AC timing parameters (e.g., tRCD min = 15 ns vs. 12.5 ns), ODT drive strength calibration, and DLL initialization sequences-requiring independent validation in target systems.