Winbond Electronics Corporation W959D8NFYA5I TR

Overview

W959D8NFYA5I 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 throughput), features configurable burst modes (linear/wrapped), and integrates dual 256Mb dies in a single 24-ball TFBGA package for compact system integration in microcontroller-based graphics and firmware storage applications.

For engineers reviewing the W959D8NFYA5I TR datasheet, W959D8NFYA5I TR pinout, W959D8NFYA5I TR application, or W959D8NFYA5I TR equivalent, this page delivers verified technical context on HyperBus timing behavior, RWDS-driven latency signaling, DDP die addressing, drive strength configuration, and hybrid sleep/deep power-down power management - all critical for real-time memory subsystem design and SoC interface validation.

Technical Context

The W959D8NFYA5I TR implements a dual-die-package (DDP) architecture with two 256Mb HyperRAM dies sharing a single 8-bit DQ bus, differential CK/CK# clock, and common CS#/RESET#/RWDS signals. Its HyperBus interface uses center-aligned command/address transfers and edge-aligned read data strobing via RWDS to manage initial access latency and refresh overhead.

It supports both linear and wrapped burst modes, with hybrid burst enabling one wrapped segment followed by linear continuation. Configuration Register 0 controls initial/fixed latency, wrapped burst lengths (16–128 bytes), drive strength, and deep power-down entry; Configuration Register 1 enables partial array refresh, hybrid sleep, and distributed refresh intervals - all accessible via HyperBus register space.

Key Specifications

Pinout & Package

Package: 24-ball TFBGA (5×5 mm, 1-ball footprint), Dual-Die-Package (DDP) construction with internal die stacking and shared I/O.

Key Features

Applications

Equivalent & Alternatives

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

Compared with W959D8NFYA5I TR, W958D8NBYA5I TR offers identical interface compatibility at half the density and lower cost, while IS66WV51216EBLL-15BLI demands significant hardware redesign but provides simpler timing and no configuration register dependency.

Availability

W959D8NFYA5I 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, long-term lifecycle assurance, and qualified industrial temperature performance.

Supply support for W959D8NFYA5I 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 Flash, WSON/TFBGA HyperRAM, and mobile DRAM.

The W959D8NFYA5I TR belongs to Winbond's HyperRAM family, designed specifically to replace parallel NOR/NAND and PSRAM in MCU-based systems where high bandwidth, low pin count, and industrial temperature resilience are essential.

FAQ

What is the maximum achievable data throughput of the W959D8NFYA5I TR?

The W959D8NFYA5I TR achieves up to 500 MB/s peak throughput using its HyperBus DDR interface at 250MHz clock rate (2 bytes transferred per clock cycle × 250 million cycles/sec). This assumes optimal linear burst operation with no wait states, continuous CS# assertion, and proper RWDS synchronization. Real-world sustained throughput depends on host controller timing margins, burst length, and refresh overhead.

Does the W959D8NFYA5I TR support both differential and single-ended clock inputs?

Yes, the W959D8NFYA5I TR supports both differential (CK/CK#) and single-ended (CK only) clock configurations. When CK# is unused, it must be left unconnected or tied to VSS; the device automatically detects single-ended mode. CK remains the sole timing reference in that configuration, and all DDR timing relationships are maintained relative to CK edges.

How does the RWDS signal function during read versus write operations in the W959D8NFYA5I TR?

In read operations, RWDS acts as a source-synchronous read data strobe - data is edge-aligned with RWDS transitions. In write operations, RWDS serves as a per-byte write mask: High masks the byte (no write), Low enables it. During the Command/Address phase of any transaction, RWDS output indicates whether additional initial latency (tRFH) is required due to internal refresh needs.

What is the purpose of the Dual-Die-Package (DDP) architecture in the W959D8NFYA5I TR?

The DDP architecture integrates two independent 256Mb HyperRAM dies in a single 24-ball TFBGA package, sharing all I/O signals. This doubles memory density without increasing pin count or PCB footprint. Die selection is handled internally via address mapping; the host sees a contiguous 512Mb address space, simplifying software integration while maintaining die-level refresh independence.

Can the W959D8NFYA5I TR operate in deep power-down mode while retaining memory contents?

Yes, the W959D8NFYA5I TR retains full memory contents in Deep Power Down mode, drawing ≤10 µA typical ICC. Entry requires writing to Configuration Register 0 and asserting CS# while clocks are stopped. Exit is triggered by CS# deassertion followed by clock restart; tDPD (deep power-down exit time) is specified at 100 µs max, ensuring rapid resumption of operation.