Winbond Electronics Corporation W956A8MBYA5I

Overview

W956A8MBYA5I from Winbond Electronics is a 64Mb HyperRAM device operating at 3.0V with HyperBus DDR interface, 200MHz clock rate (400 MT/s), and 8-bit data bus in 24-ball TFBGA package - used as high-speed external memory for microcontrollers and SoCs in graphics-intensive embedded applications.

For engineers reviewing the W956A8MBYA5I datasheet, W956A8MBYA5I pinout, W956A8MBYA5I application, or W956A8MBYA5I equivalent, key selection considerations include its 3.0V VCC/VCCQ supply, configurable burst modes (wrapped/linear/hybrid), RWDS-based latency signaling, Deep Power Down and Hybrid Sleep power states, and support for partial array refresh in resource-constrained systems.

Technical Context

The W956A8MBYA5I implements a DDR HyperBus interface with differential (CK/CK#) or single-ended clocking, using DQ[7:0] for bidirectional command/address/data transfer and RWDS as a bidirectional strobe/mask signal. It supports 6-byte Command-Address (CA) framing to define read/write, address space (memory/register), burst type, and row/column targeting.

Internally, it features configurable initial latency (1× or 2× tACC), hybrid burst (wrapped + linear), drive strength control, and dual refresh modes (full/partial array). Its memory architecture delivers sustained 400 MB/s throughput via interleaved half-page access during linear bursts, with RWDS edge-aligned read strobing and center-aligned write masking.

Key Specifications

Pinout & Package

Package: 24-ball TFBGA, 5×5 mm, 0.8 mm pitch, ball-down mounting - optimized for compact PCB layouts and thermal dissipation in space-constrained modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with W956D8MBYA5I, the W956A8MBYA5I enables direct integration into 3.0V systems without level shifters, while IS66WV1288GBLL-150B3LI offers higher density but sacrifices power efficiency, interface simplicity, and timing predictability.

Availability

W956A8MBYA5I is available at Aetrix Electronics and suitable for industrial HMI displays, automotive instrument clusters, and portable medical monitors requiring stable component supply, long-term lifecycle assurance, and guaranteed traceable sourcing.

Supply support for W956A8MBYA5I 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, Serial Flash, and HyperRAM products for embedded and industrial markets.

The W956A8MBYA5I belongs to Winbond's HyperRAM family, designed specifically to replace legacy PSRAM and parallel SRAM in bandwidth-constrained, pin-limited MCU and SoC applications demanding DDR-like throughput with simplified interface.

FAQ

What is the maximum clock frequency supported by the W956A8MBYA5I?

The W956A8MBYA5I supports a maximum clock frequency of 200MHz, enabling Double Data Rate transfers at up to 400 MT/s. This specification is validated across the full –40°C to +85°C operating temperature range and applies to both read and write transactions using the HyperBus interface. The W956A8MBYA5I achieves this performance with low signal count (11 active balls) and no external termination resistors required.

Does the W956A8MBYA5I support both differential and single-ended clocking?

Yes, the W956A8MBYA5I supports both differential (CK/CK#) and single-ended (CK only) clocking modes. In differential mode, CK and CK# must be driven with complementary signals; in single-ended mode, CK# is left unconnected and the device uses CK alone as the timing reference. This flexibility allows the W956A8MBYA5I to interface with host controllers offering either clock architecture without redesign.

How does the RWDS pin function during read versus write operations in the W956A8MBYA5I?

In the W956A8MBYA5I, RWDS serves three distinct roles: during Command/Address transfer, it outputs to signal initial latency; during read data transfer, it acts as an edge-aligned read data strobe; during write data transfer, it functions as a center-aligned write data mask. This multifunctionality eliminates the need for separate strobe and mask signals, reducing pin count while maintaining precise timing control for both directions.

What power-saving modes are available on the W956A8MBYA5I and how do they differ?

The W956A8MBYA5I offers Hybrid Sleep and Deep Power Down modes. Hybrid Sleep retains memory contents with ~150µA ICC and supports fast wake (<1µs); Deep Power Down drops ICC to <100µA but loses memory contents and requires ~100µs initialization on wake. Both modes are entered via HyperBus register writes and provide scalable energy reduction depending on retention and latency requirements of the host system.

Is the W956A8MBYA5I pin-compatible with other devices in the W956x8MBYA family?

Yes, the W956A8MBYA5I shares identical 24-ball TFBGA pinout and ball assignment with W956D8MBYA5I, W956A8MBYA6I, and W956D8MBYA6I. All variants use the same CS#, CK/CK#, DQ[7:0], RWDS, RESET#, VCC, VCCQ, VSS, and VSSQ connections. This allows drop-in replacement between speed grades (200MHz vs 166MHz) and voltage grades (3.0V vs 1.8V), provided host voltage domain and timing constraints are met.