CSS6404L High-Performance QSPI pSRAM Chip – Preferred Memory for IoT Terminals

With the rapid development of the Internet of Things (IoT), memory chips have become one of the core components of intelligent terminals, whose performance parameters directly determine the overall behavior of the devices.

As a high-performance 64Mbit QSPI Pseudo-Static Random Access Memory (pSRAM), CSS6404LS-LI has become the preferred memory solution for IoT terminal designs thanks to its outstanding technical specifications, low-power characteristics and high reliability.

Core Features of CSS6404L.

CSS6404L is available in two industry-standard packages to flexibly meet different structural design requirements: the LS version features a SOP‑8 package, offering high generality and ease of soldering; the LU version adopts an ultra-small USON‑8 package with dimensions of only 3×2mm, perfectly fitting portable, wearable and miniature IoT devices with limited space and height, aligning with the trend toward miniaturization and integration of IoT devices.

With a capacity of 64Mbit (8M×8bit), CSS6404L supports dual-mode SPI/QPI (SDR) interfaces, compatible with 1-wire and 4-wire transmission mechanisms.

Quad Peripheral Interface (QPI) mode enables four-channel parallel data transfer, greatly improving read and write efficiency.

It has a 24-bit address width (A[22:0]) and a page size of 1024Byte, achieving an optimal balance of performance, cost and usability in embedded systems.

CSS6404LS-LI operates at a VDD voltage range of 2.7~3.6V, with a typical value of 3.3V, fully matching the power supply designs of mainstream MCUs and embedded processors without additional level-shifting circuits.

The clock frequency supports three flexible configurations: 133MHz (32Byte Wrap, 3.0V), 109MHz (32Byte Wrap, 3.3V), and 84MHz (Linear Burst), allowing performance and power consumption to be balanced according to application scenarios.

In terms of power consumption, CSS6404L delivers excellent low-power performance: operating current ICC = 7mA for read/write operations; standby current is only 250μA at 85℃ and 350μA at 105℃; in Halfsleep™ sleep mode, the typical sleep current drops to 100μA at 25℃, providing ultra-long battery life for battery-powered devices.

CSS6404L offers two operating temperature ranges: standard temperature from -40℃ to +85℃ and extended temperature from -40℃ to +105℃, satisfying environmental requirements for consumer electronics, industrial control, automotive auxiliary and other multi-scenario applications.

It features a built-in self-managed auto-refresh mechanism that requires no host controller intervention, simplifying system software design and enhancing data retention reliability.

Regarding electrical characteristics, it provides 50Ω LVCMOS output drive capability, power-up initialization time tPU ≥ 150μs, and reset recovery time tRST ≥ 50ns, ensuring fast and stable chip startup.

A complete instruction set supports efficient control, including Read ID (9Fh), Enter Quad Mode (35h), Exit Quad Mode (F5h), Software Reset (66h+99h), and Burst Mode Switching (C0h), meeting full-process development and control needs.

As a critical bridge connecting the physical world and the digital world, IoT terminals are undergoing large-scale and diversified development.

With the popularization of 5G, the deployment of edge computing and the integration of artificial intelligence at the terminal level, devices demand higher data processing capabilities, lower power consumption, and stricter environmental adaptability.

Today’s IoT terminals exhibit three core characteristics: explosive growth in device connections, with applications expanding from smart homes to industrial IoT, smart cities, smart agriculture, smart healthcare and other fields; continuous miniaturization of device form factors, with wearable, implantable and patch-type devices becoming mainstream; and low power consumption, high reliability and maintenance-free operation as core design goals, especially critical for battery-powered, unattended and harsh-environment deployments.

The design features of CSS6404LS-LI precisely match these trends, making it an ideal memory choice for IoT terminals.

Core Advantages of CSS6404L Empowering IoT Terminals.

Ultra-Low Power Consumption for Extended Battery Life.

Battery power is the dominant power supply for IoT terminals, where power management directly determines user experience and product lifecycle.

CSS6404L features microampere-level standby and sleep currents, with Halfsleep™ mode further reducing energy consumption to nearly zero during idle periods.

In wireless sensors, remote monitoring nodes and other devices that operate in long-term sleep with short active periods, it significantly reduces system power consumption, extends battery replacement cycles and lowers maintenance costs.

Ultra-Small Package for PCB Space Savings.

Miniaturization and portability are key trends in IoT terminals, where PCB space is extremely valuable.

CSS6404L’s 3×2mm USON‑8 package has only 8 pins, enabling simple routing and a small footprint, leaving more room for sensors, batteries, antennas and other critical components to support thinner, more compact product designs.

Auto-Refresh Mechanism Simplifies System Design.

Conventional DRAM requires the host controller to send periodic refresh commands, consuming system resources and increasing power usage.

CSS6404L uses hardware-based self-managed auto-refresh technology to maintain data integrity without controller intervention.

This reduces host resource occupancy, lowers software programming complexity, shortens development cycles, avoids extra power consumption from refresh operations, and improves overall system stability.

QSPI High-Speed Interface for Edge Computing Requirements.

Edge computing terminals need real-time sensor data processing and fast local command response, imposing high demands on memory read/write speed.

Supporting QPI four-wire high-speed mode with a maximum clock frequency of 133MHz, CSS6404L greatly boosts data transfer rates to meet critical needs such as high-speed data caching, fast program booting and firmware loading, ensuring real-time performance and smooth operation of edge terminals.

Typical IoT Application Scenarios of CSS6404L.

IoT Gateways.

As multi-protocol and multi-network access hubs, IoT gateways require memory for system firmware, configuration parameters and temporary data caching, as well as support for firmware updates and data backup.

The 64Mbit capacity of CSS6404L satisfies storage needs for embedded systems and applications, while its high-speed interface ensures efficient data forwarding and wide-temperature suitability for indoor, outdoor and industrial field deployments.

Wireless Sensor Nodes.

Most sensor nodes are deployed in remote, unattended areas and require long-term stable operation.

CSS6404L’s low-power characteristics reduce node energy consumption, its wide temperature range adapts to outdoor high and low temperature environments, and it can locally cache collected data to prevent data loss during network outages and support unified upload after network recovery, improving data integrity and system reliability.

NB‑IoT/LoRa/Bluetooth Smart Terminals.

Low-power wide-area terminals such as NB‑IoT and LoRa, as well as Bluetooth short-range communication devices, impose strict requirements on memory power consumption, size and response speed.

CSS6404L stores sensor data, protocol stacks and configuration information, supports fast wake-up and instant response, and balances high-capacity storage with low-power operation, making it suitable for various wireless communication terminal designs.

Industrial Data Collectors and IoT Controllers.

Industrial field environments are complex, demanding high equipment reliability, high-temperature resistance and anti-interference performance.

With an extended temperature range of -40℃~+105℃, maintenance-free auto-refresh and high-speed read/write capabilities, CSS6404L reliably stores industrial collected data and control logic, ensuring real-time instruction fetching and precise execution by controllers to meet long-term stable operation requirements in industrial IoT.

As the IoT evolves toward intelligence, edge computing and low-power operation, memory chips must simultaneously deliver four core capabilities: small size, low power consumption, high speed and high reliability.

With its ultra-small package, ultra-low power consumption, high-speed QSPI interface, auto-refresh and wide-temperature features, CSS6404L perfectly aligns with the development needs of IoT terminals and is widely applicable to innovative scenarios such as smart sensing, edge AI terminals and low-power connected nodes.

As an authorized distributor of Cascadeteq (Taiwan), Shenzhen Mandu Technology Co., Ltd.

Provides full-process support for CSS6404L from design to mass production: in-stock supply of genuine original products to ensure stable delivery for mass production, and a professional technical team to resolve development and debugging issues throughout the project.

For samples, datasheets, low-power solution details or technical support, please contact us via:.

Hotline: +86-150-1290-5940.

Technical Support: sales@manduic.com.

Official Website: www.manduic.com.