Winbond Electronics Corporation W958D8NWSX4I TR

Overview

W958D8NWSX4I TR from Winbond Electronics is a 256Mb HyperRAM device implementing the HyperBus DDR interface for high-bandwidth, 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), and features configurable burst modes (wrapped/linear/hybrid), partial array refresh, and hybrid sleep/deep power-down modes. It is used as off-chip RAM in microcontroller-based graphics displays and real-time control units requiring deterministic latency and low power.

For engineers reviewing the W958D8NWSX4I TR datasheet, W958D8NWSX4I TR pinout, W958D8NWSX4I TR application, or W958D8NWSX4I TR equivalent, key selection criteria include HyperBus timing compliance, RWDS-driven latency signaling, 30-ball WLCSP package integration, and register-configurable drive strength and refresh behavior.

Technical Context

The W958D8NWSX4I TR implements a DDR HyperBus interface with bidirectional RWDS acting as both read data strobe and write data mask - not a dedicated clock or control signal. Its internal architecture uses interleaved half-page access to sustain linear bursts across row boundaries without software intervention.

It supports two clock configurations (single-ended CK or differential CK/CK#), requires no free-running clock, and uses command/address (CA) words over DQ[7:0] to define transaction type, address space (memory/register), burst mode, and target row/column. Initial latency is dynamically signaled via RWDS during CA phase, enabling adaptive timing alignment.

Key Specifications

Pinout & Package

W958D8NWSX4I TR uses a 30-ball Wafer-Level Chip-Scale Package (WLCSP) with 0.4mm pitch, optimized for space-constrained PCB layouts in portable and automotive displays.

Key Features

Applications

Equivalent & Alternatives

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

Compared with W958D8NWSX4I TR, W958D8NWSX5I offers identical functionality at reduced speed and cost, while IS66WV51216EDLL-15BLI represents a fundamentally different interface paradigm with higher pin count, fixed latency, and no dynamic power management - making W958D8NWSX4I TR the optimal choice for new HyperBus-enabled designs targeting bandwidth, density, and power efficiency.

Availability

W958D8NWSX4I TR is available at Aetrix Electronics and suitable for industrial HMI displays, automotive digital clusters, and portable medical monitors requiring stable component supply, long-term lifecycle support, and guaranteed traceability.

Supply support for W958D8NWSX4I 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, RAM, and interface-optimized products like HyperRAM and Octal Flash.

The W958D8NWSX4I TR belongs to Winbond's HyperRAM family, designed specifically to replace parallel PSRAM and low-density SDRAM in MCU-based systems where pin count, power, and simplicity are prioritized over absolute bandwidth scalability.

FAQ

What interface standard does the W958D8NWSX4I TR implement?

The W958D8NWSX4I TR implements the HyperBus DDR interface - a proprietary Winbond standard using an 8-bit bidirectional data bus (DQ[7:0]), Read-Write Data Strobe (RWDS), Chip Select (CS#), and differential or single-ended clock (CK/CK#). It is not compatible with standard DDR SDRAM, LPDDR, or QSPI protocols. The W958D8NWSX4I TR requires a HyperBus-capable host controller such as those found in selected NXP i.MX RT series or Renesas RA6M5 MCUs.

Does the W958D8NWSX4I TR support both differential and single-ended clock inputs?

Yes, the W958D8NWSX4I TR supports both differential (CK and CK#) and single-ended (CK only) clock configurations. When using single-ended mode, CK# is left unconnected and internally terminated; the clock is not required to be free-running and may be gated between transactions. This flexibility simplifies board layout and reduces BOM cost in designs where differential signaling is unnecessary. The W958D8NWSX4I TR automatically adapts to the selected clock mode based on CK# voltage level during power-up initialization.

How does RWDS function during read versus write operations in the W958D8NWSX4I TR?

In read operations, RWDS serves as a source-synchronous read data strobe - data on DQ[7:0] is edge-aligned with RWDS transitions. During the Command/Address (CA) phase, RWDS output indicates whether additional initial latency is needed (High = add one cycle). In write operations, RWDS acts as a byte mask: High masks the corresponding data byte (prevents write), Low enables it. RWDS is driven by the host during writes, unlike reads where it is slave-driven. This dual-role behavior is intrinsic to the W958D8NWSX4I TR's HyperBus protocol implementation.

What power-saving modes are available on the W958D8NWSX4I TR?

The W958D8NWSX4I TR supports three power-saving states: Interface Standby (CS# high, clock stopped), Active Clock Stop (CS# low, clock stopped), Hybrid Sleep (ultra-fast wake <1 µs, retains memory contents), and Deep Power Down (1 µA typical, requires hardware reset to exit). Hybrid Sleep is entered via register write and maintains full data retention with near-zero latency recovery - ideal for burst-oriented applications like touch-screen frame buffering. Deep Power Down reduces current by >99% compared to active mode and is controlled via Configuration Register 0. All modes are accessible without external hardware changes on the W958D8NWSX4I TR.

Is the W958D8NWSX4I TR pin-compatible with other HyperRAM devices in the same family?

Yes, the W958D8NWSX4I TR shares identical 30-ball WLCSP packaging, ball assignment, and signal definitions with other members of the W958D8NW family, including W958D8NWSX5I. Pin-to-pin compatibility extends to all functional signals (CS#, CK/CK#, DQ[7:0], RWDS, RESET#, VCC/VCCQ, VSS/VSSQ) and NC positions. This allows direct substitution between speed grades (e.g., upgrading from 200MHz to 250MHz) without PCB redesign. The W958D8NWSX4I TR maintains mechanical and electrical interoperability across the family while differing only in maximum clock rating and associated AC timing parameters.