The MSM514400E-60SJ-R1 is a 4Mbit Dynamic RAM (DRAM) manufactured by OKI Semiconductor (now Metcal). This memory chip is organized as 4,194,304 words x 1 bit. The "-60" indicates an access time of 60 nanoseconds, a critical specification for determining the speed at which data can be read from or written to the memory. DRAMs require periodic refreshing to maintain the stored data, distinguishing them from static RAM (SRAM).

Applications

• Embedded systems: Used as main memory in various embedded systems, such as industrial controllers and communication equipment.
• Graphics cards: Employed in older graphics cards as frame buffer memory.
• Printers: Utilized in printers for storing print data and image buffers.
• Test equipment: Used in test equipment for storing measurement data and program code.
• Legacy computer systems: Found in older computer systems as main system memory.

Features

• 4Mbit capacity: Provides 4,194,304 bits of storage capacity.
• Fast access time: Offers a 60 nanosecond access time for quick data retrieval and storage.
• Single power supply: Operates from a single 5V power supply.
• TTL compatible inputs/outputs: Compatible with TTL logic levels for easy interfacing with other components.
• Low power consumption: Minimizes power consumption, making it suitable for battery-powered applications.

Benefits

• Provides memory storage: Offers a substantial amount of memory storage for various applications.
• Enables fast data access: Allows for quick data retrieval and storage, improving system performance.
• Simplifies system design: Compatible with standard TTL logic levels, simplifying the integration process.
• Reduces power consumption: Low power consumption helps to extend battery life in portable devices.
• Enhances system performance: Improves overall system performance by providing fast and reliable memory access.

Additional Details

The MSM514400E-60SJ-R1 typically comes in a SOJ (Small Outline J-lead) package. Refreshing the DRAM is essential to prevent data loss; this is typically handled by a memory controller. The device has address lines that select the specific memory location to be accessed. Proper decoupling capacitors should be used to minimize noise on the power supply line. Consult the manufacturer's datasheet for detailed electrical characteristics, timing diagrams, and application circuit examples. This part is considered obsolete and may be difficult to source. Replacement with modern memory chips is usually recommended for new designs.