Against the backdrop of the rapid development of Internet of Things (IoT) technology, memory chips are core components of smart terminals, and their performance parameters directly determine the overall performance of devices. As a high-performance 64Mbit QSPI pseudo-static random access memory (pSRAM), the CascadeTeqCSS6404LS-LI boasts superior technical specifications, low power consumption and high reliability, making it the preferred storage solution for IoT terminal design.
The CSS6404L is available in two industry-standard packages to flexibly meet diverse structural design requirements. The LS version adopts the SOP-8 package with great versatility and easy soldering. The LU version features an ultra-compact USON-8 package measuring only 3×2mm, which is ideal for portable, wearable and miniature IoT devices with stringent space constraints, keeping pace with the miniaturization and integration trends of IoT equipment.This chip has a capacity of 64Mbit (8M×8bit) and supports dual SPI/QPI (SDR) interfaces compatible with single-wire and four-wire transmission modes. The QPI (Quad Peripheral Interface) mode enables quadruple parallel data transmission to greatly improve read and write efficiency. Equipped with a 24-bit address bus (A[22:0]) and a 1024Byte page size, it delivers an optimal balance of performance, cost and usability for embedded systems.The operating voltage range of the CSS6404LS-LI is 2.7V to 3.6V with a typical voltage of 3.3V, which is fully compatible with mainstream MCUs and embedded processors and eliminates the need for additional level shifting circuits. Three clock frequency options are available for flexible configuration: 133MHz (32Byte Wrap @ 3.0V), 109MHz (32Byte Wrap @ 3.3V) and 84MHz (Linear Burst), allowing developers to balance performance and power consumption according to application scenarios.The CSS6404L achieves excellent low power consumption. Its operating current for read and write operations is 7mA. The standby current is only 250μA at 85°C and 350μA at 105°C. In Halfsleep™ mode, the typical sleep current drops to 100μA at 25°C, effectively extending the battery life of battery-powered devices.Two operating temperature ranges are offered: standard range from -40°C to +85°C and extended range from -40°C to +105°C, covering application scenarios including consumer electronics, industrial control and vehicle auxiliary systems. It integrates an autonomous self-refresh mechanism that requires no intervention from the main controller, simplifying system software design and enhancing data retention reliability.In terms of electrical characteristics, it features a 50Ω LVCMOS output driver. The power-up initialization time tPU is no less than 150μs and the reset recovery time tRST is no less than 50ns, ensuring fast and stable startup. A complete instruction set supports comprehensive device control, including Read ID (9Fh), Quad Mode Enable (35h), Quad Mode Disable (F5h), Software Reset (66h+99h) and Burst Mode Switch (C0h), to meet development requirements throughout the whole process.As a vital bridge connecting the physical and digital worlds, IoT terminals are undergoing large-scale and diversified development. With the popularization of 5G, implementation of edge computing and deployment of artificial intelligence technologies, terminal devices are faced with higher requirements for data processing capability, lower power consumption and stronger environmental adaptability.Current IoT terminals present three major characteristics. The number of connected devices keeps growing, and application scenarios have expanded from smart home to industrial IoT, smart city, smart agriculture, smart healthcare and more. Device form factors continue to shrink, with wearable, implantable and chip-on-board devices becoming mainstream. Low power consumption, high reliability and maintenance-free operation have become core design goals, which are especially critical for battery-powered, unattended devices deployed in harsh environments. The design features of the CSS6404LS-LI precisely align with these trends, making it an ideal storage option for IoT terminals.
Most IoT terminals are battery-powered, and power consumption directly affects user experience and service life. The CSS6404L features standby and sleep current at the microampere level, and the Halfsleep™ mode further cuts power draw. It generates nearly no extra power consumption during standby. For wireless sensor nodes and remote monitoring devices that work intermittently after long standby periods, this chip can greatly reduce overall system power consumption, extend battery replacement cycles and lower operation and maintenance costs.
Miniaturization and portability are key development directions for IoT terminals, where PCB space is extremely valuable. The CSS6404L comes in a 3×2mm USON-8 package with only 8 pins. It simplifies wiring and occupies minimal board area, reserving more space for sensors, batteries, antennas and other key components, and enabling slimmer and more compact product designs.
Traditional DRAM requires the main controller to send refresh commands periodically, which consumes system resources and increases power consumption. Adopting hardware autonomous self-refresh technology, the CSS6404L maintains data integrity without controller intervention. It reduces resource occupancy of the main chip, lowers software programming complexity, shortens development cycles, avoids extra power consumption caused by refresh operations and improves overall system stability.
Edge computing terminals need to process sensor data in real time and respond to local commands quickly, which sets high standards for storage read and write speed. Supporting the high-speed four-wire QPI mode with a maximum clock frequency of 133MHz, the CSS6404L delivers drastically increased data transmission speed. It fully satisfies demands for high-speed data caching, fast program startup and firmware loading, and guarantees real-time performance and smooth operation of edge terminals.
As hubs for multi-protocol and multi-network access, IoT gateways need to store system firmware, configuration parameters and temporary cached data, and support firmware upgrade and data backup. The 64Mbit capacity of the CSS6404L fully meets the storage demands of embedded systems and applications. Its high-speed interface ensures efficient data forwarding, and the wide temperature range enables reliable deployment indoors, outdoors and at industrial sites.
Most sensor nodes are deployed in remote and unattended areas and require long-term stable operation. The low power consumption of the CSS6404L cuts energy use of nodes, and the wide temperature range adapts to extreme hot and cold outdoor conditions. It can cache collected data locally to prevent data loss during network outages and realize unified data upload after network recovery, improving data integrity and system reliability.
Low-power wide-area terminals such as NB-IoT and LoRa devices, as well as short-range Bluetooth communication equipment, have strict requirements for storage power consumption, size and response speed. The CSS6404L can store sensor data, protocol stacks and configuration information, and support fast wake-up and instant response. It balances large storage capacity and low-power operation, and fits well with the design of various wireless communication terminals.
Industrial sites feature complex working environments that demand high device reliability, high temperature resistance and anti-interference capability. With an extended temperature range of -40°C to +105°C, maintenance-free self-refresh function and high-speed read/write performance, the CSS6404L stably stores industrial collected data and control logic. It ensures controllers read instructions and perform operations accurately in real time, and supports long-term stable operation of industrial IoT systems.As the IoT industry continues to evolve toward intelligence, edge computing and low power consumption, memory chips are required to combine small size, low power consumption, high speed and high reliability. Featuring ultra-compact package, ultra-low power consumption, high-speed QSPI interface, self-refresh function and wide temperature tolerance, the CSS6404L perfectly caters to the development needs of IoT terminals. It is widely applied in smart sensors, edge AI terminals, low-power connected nodes and other innovative scenarios.As an officially authorized distributor of CascadeTeq from Taiwan, Shenzhen Mandu Technology Co., Ltd. provides full-cycle support for the CSS6404L ranging from solution design to mass production. We supply genuine products in stock to guarantee stable delivery for volume production, and our professional technical team solves development and debugging problems throughout the process.Feel free to contact us for samples, datasheets, low-power solution details and technical support:
Hotline: 150-1290-5940
Technical Support: sales@manduic.com
Official Website: www.manduic.com
Telephone: +86-150-1290-5940
Mobile phone: +86-150-1290-5940
Mailbox: sales@manduic.com
Address: Room 618, 6th Floor, Derun Building, No. 366 Chaofeng Road, Fenghuang Street, Guangming District, Shenzhen, China