Winbond Electronics Corporation W948D2FBJX6E

Overview

W948D2FBJX6E from Winbond is a 256Mb mobile LPDDR SDRAM with x16 data bus, 1.7–1.95V VDD/VDDQ supply, CAS latency of 2 or 3, and support for burst lengths of 2/4/8/16 in sequential or interleave mode - used as main memory in space-constrained portable devices including smartphones and ultra-thin tablets.

For engineers reviewing the W948D2FBJX6E datasheet, W948D2FBJX6E pinout, W948D2FBJX6E application, or W948D2FBJX6E equivalent, key selection considerations include its 60-ball VFBGA (x16) package, PASR/ATCSR power management, deep power-down mode, differential clock interface, and compatibility with LPDDR1 protocol timing and command set.

Technical Context

This LPDDR SDRAM implements four independent internal banks enabling bank interleaving to hide precharge latency. It uses differential CK/CK inputs for clock synchronization and bidirectional DQS strobes aligned with read data and centered on write data.

Initialization requires strict sequencing: power ramp with CKE high, ≥200μs stable clocks, PRECHARGE ALL, two AUTO REFRESH commands, then Mode Register and Extended Mode Register programming. The device supports programmable output drive strength, auto-precharge per burst, and clock stop during idle periods.

Key Specifications

Pinout & Package

W948D2FBJX6E is packaged in a 60-ball Very Thin Fine-Pitch Ball Grid Array (VFBGA) with 0.5mm pitch, footprint-optimized for mobile PCB layouts. Pin assignment follows LPDDR x16 standard layout per datasheet Section 3.1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LPDDR1 memory applications.

Compared with MT46H32M16LFCK-6 IT:F and ELPIDA EDF8164AFA-6J-F, W948D2FBJX6E provides verified industrial temperature operation, active manufacturing status, and Winbond's documented PASR/ATCSR implementation - making it the preferred choice for cost-sensitive, volume production of portable electronics.

Availability

W948D2FBJX6E is available at Aetrix Electronics and suitable for smartphone memory subsystems, tablet main memory designs, and wearable device buffer implementations requiring stable component supply, consistent LPDDR1 timing compliance, and industrial temperature support.

Supply support for W948D2FBJX6E 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 low-power DRAM for mobile and embedded markets.

W948D2FBJX6E belongs to Winbond's Mobile LPDDR SDRAM product line, designed specifically for battery-powered portable devices needing high bandwidth, low active/standby power, and compact packaging.

FAQ

What is the package type and ball count for W948D2FBJX6E?

W948D2FBJX6E uses a 60-ball Very Thin Fine-Pitch Ball Grid Array (VFBGA) package with 0.5mm pitch, conforming to LPDDR x16 standard layout. This compact footprint is optimized for space-constrained mobile PCBs and matches the pin assignment shown in Section 3.1 of the official datasheet.

Does W948D2FBJX6E support CAS latency of 2 and 3?

Yes, W948D2FBJX6E supports programmable CAS latency of 2 or 3, configured via bits A4–A6 in the Mode Register. CL=2 enables lower read access latency for time-critical operations, while CL=3 provides additional timing margin for higher-frequency or longer-trace interfaces - both are fully supported per datasheet Section 6.2.2.

What power-saving features does W948D2FBJX6E implement?

W948D2FBJX6E implements Partial Array Self Refresh (PASR), Automatic Temperature Compensated Self Refresh (ATCSR), Power Down Mode, Deep Power Down (DPD) Mode, and Clock Stop capability. These features collectively reduce standby current and extend battery life in portable applications without compromising data retention or wake-up latency.

Is W948D2FBJX6E compatible with LPDDR1 controllers?

Yes, W948D2FBJX6E is a JEDEC-compliant LPDDR1 SDRAM and interoperates with standard LPDDR1 memory controllers. Its command set (ACTIVE, READ, WRITE, PRECHARGE, AUTO REFRESH, etc.), timing parameters (tRCD, tRP, tRC), and electrical interface (differential CK/CK, DQS-strobed DQ) align with LPDDR1 specification requirements.

What is the refresh requirement for W948D2FBJX6E?

W948D2FBJX6E requires a 64ms refresh interval (tREFI) to maintain data integrity. For the x16 configuration, this translates to 7.8μs per bank refresh cycle. The device supports both AUTO REFRESH and SELF REFRESH modes, with ATCSR dynamically adjusting refresh rate based on junction temperature.