AS4C64M4SA-7TCN

The AS4C64M4SA-7TCN is a 256Mbit Synchronous DRAM (SDRAM) from Alliance Memory, organized as 64M x 4 bits. This parallel interface memory device operates at clock frequencies up to 143MHz with a fast 5.5ns access time, making it suitable for applications requiring high-bandwidth volatile memory storage.

Housed in a 54-pin TSOP II package with 10.16mm width, this SDRAM operates from a 3V to 3.6V supply voltage and supports commercial temperature range operation from 0°C to 70°C.

Key Features

• Memory Architecture - 256Mbit density organized as 64M x 4, providing flexible memory addressing for embedded system designs.
• High-Speed Operation - 143MHz clock frequency with 5.5ns access time enables high-bandwidth data transfers for demanding applications.
• Parallel Interface - Standard parallel memory interface ensures broad compatibility with existing memory controllers and processor designs.
• Low Voltage Operation - 3V to 3.6V supply voltage range reduces power consumption compared to 5V alternatives.
• Commercial Temperature Range - Specified operation from 0°C to 70°C covers standard commercial and office environment requirements.
• Industry-Standard Package - 54-TSOP II (10.16mm width) footprint allows drop-in replacement compatibility with other manufacturers.

Typical Applications

• Networking Equipment - This SDRAM provides packet buffering and routing table storage in switches, routers, and network interface cards where the 143MHz clock speed supports wire-rate data processing.
• Consumer Electronics - Set-top boxes, digital media players, and display systems benefit from the 256Mbit density for frame buffering and application code execution within commercial temperature environments.
• Office Automation - Printers, copiers, and multifunction devices utilize this memory for print spooling and image processing where the parallel interface simplifies integration with existing controller designs.
• Embedded Computing - Single-board computers and embedded modules leverage the 64M x 4 organization for efficient memory utilization in space-constrained designs using the compact TSOP II package.

Unique Advantages

• Proven SDRAM Technology: Mature, well-characterized memory technology reduces design risk and simplifies firmware development with established timing parameters.
• Second-Source Availability: Alliance Memory provides supply chain continuity as an alternative source for standard SDRAM configurations.
• Compact Form Factor: The 54-TSOP II package offers high density in a surface-mount footprint suitable for automated assembly processes.
• Broad Voltage Tolerance: The 3V to 3.6V operating range accommodates typical 3.3V system voltage variations without requiring tight regulation.
• Active Lifecycle Status: Currently in active production status, supporting both new designs and long-term product maintenance requirements.

Why Choose AS4C64M4SA-7TCN?

The AS4C64M4SA-7TCN delivers a balanced combination of density, speed, and compatibility for designs requiring proven SDRAM performance. With 256Mbit capacity and 143MHz operation, this device addresses mainstream embedded memory requirements without over-specifying performance or capacity.

Engineers designing commercial-grade equipment will appreciate the straightforward integration path offered by the standard parallel interface and industry-compatible TSOP II package. The active production status from Alliance Memory ensures long-term availability for volume production and product lifecycle support.

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