Winbond Electronics Corporation W94AD2KBJX5I

Overview

W94AD2KBJX5I from Winbond is a 1Gb mobile LPDDR SDRAM with x32 data bus, 200MHz clock rate, 1.8V VDD/VDDQ supply, and 90-ball VFBGA package rated for -40°C to +85°C industrial operation. It implements four internal banks, CAS latency of 2 or 3, burst lengths of 2/4/8/16, and supports partial array self-refresh (PASR) and automatic temperature-compensated self-refresh (ATCSR) for low-power mobile applications.

For engineers reviewing the W94AD2KBJX5I datasheet, W94AD2KBJX5I pinout, W94AD2KBJX5I application, or W94AD2KBJX5I equivalent, key selection criteria include its x32 interface width, industrial temperature range, deep power-down mode, programmable output drive strength, and differential clock input compatibility with LPDDR controller timing requirements.

Technical Context

The W94AD2KBJX5I uses a synchronous double-data-rate architecture with differential CK/CK inputs and bidirectional DQS strobes per byte lane (DQS0–DQS3). Its command decoder interprets CS, RAS, CAS, and WE in conjunction with BA0/BA1 bank select and A[12:0] row/column addresses to manage active, read, write, precharge, auto-refresh, and self-refresh states across four independent banks.

Initialization requires strict sequencing: stable VDD/VDDQ with CKE high, ≥200μs clock stabilization, PRECHARGE ALL, two AUTO REFRESH commands, then Mode Register and Extended Mode Register programming. The device supports clock stop, power-down, and deep power-down modes - all entered synchronously via CKE control and command state transitions defined in its simplified state diagram.

Key Specifications

Pinout & Package

W94AD2KBJX5I uses a 90-ball Very Thin Fine-Pitch Ball Grid Array (VFBGA) package measuring 10.5mm × 13.0mm × 0.6mm (JEDEC MO-245AC), optimized for space-constrained mobile PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MT46H128M32LF-6 IT and K4P4G324EC-BCF7, the W94AD2KBJX5I delivers higher bandwidth at 200MHz while maintaining industrial temperature compliance and LPDDR-specific low-power features like PASR and ATCSR - making it optimal for new mobile and embedded designs targeting 400MT/s performance within tight thermal envelopes.

Availability

W94AD2KBJX5I is available at Aetrix Electronics and suitable for smartphone application processor memory, tablet GPU frame buffers, industrial handheld terminal RAM, and automotive infotainment system memory requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for W94AD2KBJX5I 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, SLCD RAM, and mobile DRAM products.

The W94AD2KB series belongs to Winbond's LPDDR SDRAM product line, designed specifically for battery-powered portable devices requiring high bandwidth, low active power, and advanced self-refresh intelligence for extended runtime.

FAQ

What is the maximum data rate supported by W94AD2KBJX5I?

The W94AD2KBJX5I supports a maximum clock frequency of 200MHz, enabling a data transfer rate of 400MT/s (megatransfers per second) due to its double-data-rate architecture. This is confirmed in the order information table and electrical characteristics section of the official datasheet, where the "-5" speed grade denotes 200MHz operation. The W94AD2KBJX5I achieves this rate using differential CK/CK inputs and edge-aligned DQS strobes for precise timing capture.

Does W94AD2KBJX5I support both sequential and interleaved burst types?

Yes, the W94AD2KBJX5I supports both sequential and interleaved burst types, selectable via bit A3 in the Mode Register. When A3 = 0, bursts proceed in linear address order; when A3 = 1, they follow an interleaved pattern that improves cache-line efficiency for certain access patterns. This capability is documented in Section 7.3.4 of the datasheet and applies identically to all burst lengths (2, 4, 8, 16) supported by the W94AD2KBJX5I.

What is the ball count and package type of W94AD2KBJX5I?

The W94AD2KBJX5I uses a 90-ball Very Thin Fine-Pitch Ball Grid Array (VFBGA) package, as specified in the Order Information table and detailed in Section 4.2 of the datasheet. This package measures 10.5mm × 13.0mm × 0.6mm (JEDEC MO-245AC) and is distinct from the 60-ball VFBGA used for the x16 variants like W94AD6KBHX5I. The 90-ball configuration accommodates the full x32 data bus, four DQS lines, four DM signals, and expanded address/control routing required by the W94AD2KBJX5I.

How does Partial Array Self-Refresh (PASR) function in W94AD2KBJX5I?

In the W94AD2KBJX5I, Partial Array Self-Refresh (PASR) allows the device to refresh only selected sub-arrays instead of the entire 1Gb memory space during self-refresh mode. This feature is configured via the Extended Mode Register and reduces refresh current proportionally - for example, refreshing half the array cuts self-refresh power by ~50%. PASR is particularly valuable in mobile applications where memory usage is sparse, such as background app maintenance or sensor buffering, and is explicitly listed in the Features section as a key low-power capability of the W94AD2KBJX5I.

Is W94AD2KBJX5I compatible with standard LPDDR controllers?

Yes, the W94AD2KBJX5I complies fully with the JEDEC LPDDR (Low Power DDR SDRAM) standard JESD209, supporting all mandatory commands (ACTIVE, READ, WRITE, PRECHARGE, AUTO REFRESH, SELF REFRESH), timing parameters, and electrical specifications required for interoperability. Its command encoding, burst behavior, and initialization sequence align with industry-standard LPDDR controllers found in Qualcomm Snapdragon, MediaTek Helio, and NXP i.MX application processors - confirming functional compatibility when configured for x32 width and 200MHz operation in the W94AD2KBJX5I.