The HM514400CZ-70 is a 4Mbit DRAM (Dynamic Random Access Memory) chip produced by Hitachi. This DRAM is organized as 4,194,304 words x 1 bit and is designed for applications requiring a moderate amount of memory with relatively fast access times. The "-70" suffix typically indicates an access time of 70ns.

Applications

• Main memory in older computers and workstations.
• Video memory in graphics cards.
• Memory for embedded systems.
• Printers and other peripherals.

Features

• Capacity: 4 Mbit (4M x 1 bit)
• Organization: 4,194,304 words x 1 bit
• Access Time: 70 ns
• Package: ZIP (Zig-zag In-line Package) or SOJ (Small Outline J-lead Package) - package needs verifying.
• Refresh Requirement: Requires periodic refresh cycles to retain data.
• Power Supply: 5V

Benefits

• Fast Access Time: 70ns access time allows for quick data retrieval.
• Moderate Capacity: 4Mbit provides a reasonable amount of memory for various applications.
• Standard Interface: Compatible with standard DRAM controllers.

Additional Details

The HM514400CZ-70 is a dynamic RAM, so it requires periodic refresh cycles to maintain the integrity of the stored data. This chip likely came in a ZIP or SOJ package, allowing for relatively high density on circuit boards. The 4M x 1 organization means the memory is accessed one bit at a time. This type of DRAM was commonly used in systems before the widespread adoption of SDRAM. The 70ns access time is considered relatively fast for DRAM of that era.