Winbond Electronics Corporation W989D2DBJX6E

Overview

W989D2DBJX6E from Winbond is a 512Mb (8,388,608 words × 4 banks × 16 bits) low-power synchronous DRAM optimized for battery-powered mobile applications. It operates at 1.8V VDD/VDDQ, supports 166MHz clock frequency (−6 speed grade), delivers x32 I/O width via 90-ball VFBGA, and implements Automatic Temperature Compensated Self Refresh (ATCSR) and Partial Array Self Refresh (PASR) to minimize active/idle power consumption in handheld devices.

For engineers reviewing the W989D2DBJX6E datasheet, W989D2DBJX6E pinout, W989D2DBJX6E application, or W989D2DBJX6E equivalent, this page provides verified electrical parameters, ball assignment mapping, low-power mode timing behavior, burst-length programmability (1/2/4/8/full-page), CAS latency options (CL=2/3), and validated alternative parts for mobile memory design continuity.

Technical Context

The W989D2DBJX6E uses a 4-bank architecture with multiplexed row/column addressing (A0–A12 for rows, A0–A8 for columns in x32 mode) and dual bank-select signals (BA0/BA1). Its command decoder interprets RAS/CAS/WE combinations synchronized to CLK rising edges, supporting full command set including Auto Refresh, Self Refresh Entry/Exit, Deep Power Down (DPD), and Clock Suspend Mode.

It integrates dedicated control logic for burst termination, programmable output driver strength, and DQM-based data masking with zero-latency write blocking. The ATCSR feature dynamically adjusts self-refresh current based on die temperature, while PASR enables selective refresh of only active memory sub-arrays-both critical for extending battery life in portable electronics without sacrificing density or bandwidth.

Key Specifications

Pinout & Package

W989D2DBJX6E uses a 90-ball Very Thin Fine-Pitch Ball Grid Array (VFBGA) package with 0.5mm pitch, designed for compact PCB layouts in space-constrained mobile platforms. Ball assignment follows JEDEC-standard LPSDR x32 configuration.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-power SDRAM applications.

Compared with W989D2DBJX6I, the W989D2DBJX6E trades −40°C startup capability for lower cost and higher availability in consumer supply chains; versus MT47H64M32LFP-37E, it retains legacy LPSDR compatibility without requiring controller firmware changes or new clocking infrastructure.

Availability

W989D2DBJX6E is available at Aetrix Electronics and suitable for smartphone baseband subsystems, digital still camera image buffers, portable gaming console RAM, industrial handheld terminals, and other battery-powered embedded systems requiring stable component supply across multi-year production cycles.

Supply support for W989D2DBJX6E 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 SPI NOR Flash, PSRAM, and low-power DRAM for mobile and IoT markets.

The W989D2DBJX6E belongs to Winbond's LPSDR product line, engineered specifically for power-constrained portable electronics where memory density, standby current, and thermal efficiency must coexist without compromising interface simplicity or controller compatibility.

FAQ

What is the maximum clock frequency supported by the W989D2DBJX6E?

The W989D2DBJX6E supports a maximum clock frequency of 166MHz, corresponding to the "−6" speed grade designation in its part number. This allows peak data transfer rates of 332MB/s in burst mode with x32 I/O width. Timing compliance requires meeting tAC (address-to-clock setup) and tDC (data-to-clock hold) specifications under 1.8V ±0.15V supply and −25°C to +85°C ambient conditions, as defined in the official Winbond datasheet revision A01-002.

Does the W989D2DBJX6E support both CAS Latency 2 and CAS Latency 3?

Yes, the W989D2DBJX6E supports programmable CAS Latency of either 2 or 3, configured via the Mode Register Set (MRS) command using address bits A6–A4. CL=2 reduces read access latency by one clock cycle compared to CL=3 but imposes stricter timing margins on tRP and tRCD. The selection is made at initialization and remains fixed until reconfigured; both settings are fully validated across the −25°C to +85°C operating range for W989D2DBJX6E.

How does Automatic Temperature Compensated Self Refresh (ATCSR) function in the W989D2DBJX6E?

ATCSR in the W989D2DBJX6E dynamically scales self-refresh current based on on-die temperature measurements, reducing power draw at lower temperatures without compromising data retention. Unlike fixed-rate self-refresh, ATCSR lowers IDD6 (self-refresh current) by up to 50% at 25°C while maintaining full JEDEC-compliant retention time. This feature is enabled by default and requires no external configuration - it operates transparently whenever the device enters Self Refresh mode, directly benefiting battery life in W989D2DBJX6E-based portable designs.

What package type and ball count does the W989D2DBJX6E use?

The W989D2DBJX6E uses a 90-ball Very Thin Fine-Pitch Ball Grid Array (VFBGA) package with 0.5mm ball pitch, conforming to JEDEC MO-244 standard. This package supports the x32 I/O configuration and is optimized for compact PCB footprints in mobile devices. Pin assignments follow the LPSDR x32 layout documented in section 4.2 of the Winbond datasheet, including dedicated DQM0–DQM3 mask lines and separated VDDQ/VSSQ power domains for noise isolation.

Can the W989D2DBJX6E be used as a drop-in replacement for standard SDRAM in existing designs?

No, the W989D2DBJX6E is not a drop-in replacement for standard SDRAM due to key architectural differences: it requires LPSDR-specific command sequences (e.g., Deep Power Down entry/exit), supports only 1.8V operation (not 3.3V or 2.5V), and implements ATCSR/PASR features that demand controller-level enablement. While pin-compatible with other Winbond LPSDR x32 parts like W989D2DBJX6I, substituting into non-LPSDR designs will cause functional failure or excessive power consumption unless the memory controller firmware and hardware timing constraints are explicitly updated for W989D2DBJX6E.