Winbond Electronics Corporation W989D6DBGX6I

Overview

W989D6DBGX6I from Winbond is a 512Mb (4M × 4 banks × 16-bit) low-power synchronous DRAM IC designed for battery-powered mobile applications. It operates at 1.8V, supports 166MHz clock frequency (−6 speed grade), delivers CAS latency of 2 or 3, and implements Partial Array Self Refresh (PASR) and Automatic Temperature Compensated Self Refresh (ATCSR) to minimize active and standby power in handheld devices like smartphones and digital cameras.

For engineers reviewing the W989D6DBGX6I datasheet, W989D6DBGX6I pinout, W989D6DBGX6I application, or W989D6DBGX6I equivalent, key selection criteria include its 54-ball VFBGA x16 package, industrial temperature range (−40°C to +85°C), LVCMOS-compatible interface, burst length programmability (1/2/4/8/full page), and deep power-down mode for ultra-low quiescent current in sleep states.

Technical Context

This LPSDR uses a 4-bank architecture with multiplexed row/column addressing via A0–A12 and BA0/BA1, where A10 serves as Auto Precharge Select. Its command decoder interprets standard SDRAM control signals (CS, RAS, CAS, WE, CKE, CLK) to execute bank activate, precharge, read/write with or without auto-precharge, MRS/EMRS, self-refresh entry/exit, and deep power-down entry/exit.

The device integrates dedicated circuitry for ATCSR-dynamically adjusting self-refresh current based on die temperature-and PASR, enabling software-selectable refresh of only active memory sub-arrays. It supports both sequential and interleaved burst addressing modes and features programmable output driver strength for signal integrity optimization across varying load conditions.

Key Specifications

Pinout & Package

W989D6DBGX6I is housed in a 54-ball Very Thin Fine-Pitch Ball Grid Array (VFBGA) package measuring 8.0 mm × 10.5 mm × 0.6 mm (height), optimized for mobile PCB stacking and thermal dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IS42S16160J-6BLI and W989D6DBGX6E, W989D6DBGX6I uniquely delivers ATCSR and PASR within an industrial-temperature 54-ball VFBGA, making it the only option among the three that guarantees ultra-low-power operation across wide thermal excursions without firmware overhead or external components.

Availability

W989D6DBGX6I is available at Aetrix Electronics and suitable for smartphone baseband subsystems, digital camera image buffers, portable medical monitors, and industrial handheld terminals requiring stable component supply across extended product lifecycles.

Supply support for W989D6DBGX6I 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 embedded markets.

W989D6DBGX6I belongs to Winbond's LPSDR family, engineered specifically for battery-constrained portable electronics where memory bandwidth must be balanced against milliwatt-level power budgets and small-form-factor packaging.

FAQ

What is the operating voltage range for W989D6DBGX6I?

W989D6DBGX6I operates with VDD and VDDQ supplied between 1.7V and 1.95V, with nominal operation at 1.8V. This narrow voltage window ensures compatibility with modern 1.8V I/O standards while minimizing dynamic power consumption. The specification is validated across the full industrial temperature range (−40°C to +85°C), and operation outside this range may result in timing violations or data corruption. W989D6DBGX6I does not support 3.3V or 2.5V interfaces.

Does W989D6DBGX6I support both CAS latency 2 and 3?

Yes, W989D6DBGX6I supports programmable CAS latency of either 2 or 3, configured via the Mode Register Set (MRS) command using bits A6–A4. CL=2 provides lower access latency ideal for real-time interrupt handling, while CL=3 offers greater timing margin for robust operation at maximum 166MHz frequency or under marginal signal integrity conditions. The setting persists until reprogrammed and applies uniformly across all banks and burst operations. W989D6DBGX6I does not support CL=1 or CL=4.

How does Partial Array Self Refresh (PASR) function in W989D6DBGX6I?

In W989D6DBGX6I, PASR is enabled via Extended Mode Register Set (EMRS) commands to refresh only a subset of the 4 internal banks-configurable as 1/2, 1/4, or 1/8 of total array-reducing self-refresh current proportionally. This feature is critical for applications where only part of memory is active (e.g., UI framebuffer vs. background app data), delivering up to 75% power savings over full-array refresh. PASR requires no hardware modification and is fully controlled by host processor firmware. W989D6DBGX6I implements PASR independently of ATCSR.

What is the ball count and package type of W989D6DBGX6I?

W989D6DBGX6I uses a 54-ball Very Thin Fine-Pitch Ball Grid Array (VFBGA) package, with dimensions of 8.0 mm × 10.5 mm × 0.6 mm. This x16-configuration package is distinct from the 90-ball VFBGA used for the x32 variant (e.g., W989D2DBJX6I). The 54-ball layout supports standard PCB assembly processes and is optimized for thermal performance in thin-profile mobile devices. Pin compatibility with other Winbond LPSDR x16 variants (e.g., W989D6DBGX6E) is maintained within the same package footprint.

Can W989D6DBGX6I enter Deep Power Down Mode, and what is its exit time?

Yes, W989D6DBGX6I supports Deep Power Down Mode (DPD), entered via a specific command sequence with CKE low and /CS high. In DPD, supply current drops to ≤1 µA, enabling multi-month battery standby. Exit is initiated by driving CKE high while maintaining /CS high, followed by a mandatory tDPDEX delay of ≤100 µs before issuing any valid command. During this exit window, the device ignores all inputs except CKE. W989D6DBGX6I requires no external reset or initialization after DPD exit-only standard mode register setup if changed.