Winbond Electronics Corporation W959D8NFYA4II TR

Overview

W959D8NFYA4II TR from Winbond Electronics is a 512Mb (64MB) HyperRAM device implementing the HyperBus DDR interface for high-speed, low-pin-count external memory expansion in resource-constrained embedded systems. It operates at 1.8V, supports up to 250MHz clock frequency (500 MB/s peak bandwidth), uses an 8-bit bidirectional data bus with RWDS strobe/mask, and integrates dual 256Mb dies in a single 24-ball TFBGA package for compact system memory scaling.

For engineers reviewing the W959D8NFYA4II TR datasheet, W959D8NFYA4II TR pinout, W959D8NFYA4II TR application, or W959D8NFYA4II TR equivalent, this page delivers verified electrical parameters, burst configuration options, power-saving modes (Hybrid Sleep, Deep Power Down), and dual-die addressing behavior critical for real-time graphics buffering, firmware overlay execution, and boot-time memory mapping in MCU-based edge devices.

Technical Context

The W959D8NFYA4II TR implements a dual-die-package (DDP) architecture where two independent 256Mb HyperRAM dies share a common 8-bit DQ bus, CS#, CK/CK#, RESET#, and RWDS signals within one 24-ball TFBGA. Each die responds to distinct address ranges via die-select logic triggered by upper row address bits.

Its HyperBus interface uses DDR signaling on DQ[7:0] synchronized to either single-ended CK or differential CK/CK#, with RWDS serving as both initial latency indicator (output during CA phase) and source-synchronous read strobe / write mask (bidirectional). Burst operations support linear (for sequential image/video transfers) and wrapped (for cache-line-aligned fetches) modes, configurable per transaction via Command/Address bits.

Key Specifications

Pinout & Package

Package: 24-ball TFBGA (5×5 mm, 1-ball footprint), Dual-Die-Package (DDP) construction with shared interface signals across two internal 256Mb dies.

Key Features

Applications

Equivalent & Alternatives

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

Compared with W959D8NFYA4II TR, W958D8NFYA4I offers half the density in identical packaging and interface, simplifying layout but limiting scalability; IS66WV51216EDLL-100BLI provides raw speed without burst or power optimization, demanding more board resources and yielding no latency or energy advantages in modern embedded SoC architectures.

Availability

W959D8NFYA4II TR is available at Aetrix Electronics and suitable for industrial HMI, automotive instrument clusters, IoT edge gateways, and medical portable devices requiring stable component supply with guaranteed long-term manufacturability.

Supply support for W959D8NFYA4II TR 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/NAND, HyperRAM, and TrustME secure flash for embedded and automotive markets.

The W959D8NFYA4II TR belongs to Winbond's HyperRAM family, engineered to replace parallel NOR/NAND and PSRAM in MCU- and SoC-based systems where pin count, power efficiency, and DDR-like bandwidth are critical design constraints.

FAQ

What is the exact memory organization of the W959D8NFYA4II TR?

The W959D8NFYA4II TR contains two 256Mb dies in a Dual-Die-Package (DDP), totaling 512Mb (64MB) of memory. Each die is organized as 32M words × 16 bits, with addressing split between row (upper bits) and column (lower bits) to support both linear and wrapped burst operations. Die selection is implicit via upper row address bits per HyperBus specification.

Does the W959D8NFYA4II TR support differential clocking?

Yes, the W959D8NFYA4II TR supports both differential (CK/CK#) and single-ended (CK only) clocking modes. CK# is unused in single-ended mode. The interface does not require a free-running clock, enabling flexible clock gating for power savings during idle periods without violating timing constraints.

How does RWDS function during read versus write transactions in the W959D8NFYA4II TR?

In read transactions, RWDS serves as a source-synchronous read data strobe - data is edge-aligned with RWDS transitions. In write transactions, RWDS acts as a per-byte mask: High masks the byte (no write), Low enables it (valid write). During the Command/Address phase, RWDS output indicates whether additional refresh latency (tRFH) is required before data transfer begins.

What power-saving modes are implemented in the W959D8NFYA4II TR?

The W959D8NFYA4II TR implements Hybrid Sleep (fast wake, reduced ICC) and Deep Power Down (ultra-low ICC <5 µA, full retention loss). Both are entered via HyperBus register writes and exited via CS# assertion or RESET#. No external hardware control lines beyond CS# and RESET# are needed to manage these states.

Is the W959D8NFYA4II TR pin-compatible with other Winbond HyperRAM devices in the same package?

Yes, the W959D8NFYA4II TR shares identical 24-ball TFBGA pinout and signal assignment with other Winbond HyperRAM parts in the YA series (e.g., W958D8NFYA4I, W959D8NFYA5I), including CS#, CK/CK#, DQ[7:0], RWDS, RESET#, and power/ground balls. This enables drop-in replacement within the same density class and timing grade.