HM628128LP-8
HM628128LP-8 - 128K x 8 85ns CMOS SRAM | Renesas
The Renesas Electronics HM628128LP-8 is a 128K x 8-bit high-speed CMOS static RAM with an 85 ns access time, supplied in a 32-pin PDIP package. The device provides 131,072 words of read/write memory, implements eight parallel data bits, and uses 0.8 μm Hi-CMOS process technology to combine higher density, faster access, and low power consumption.
Static random-access memory, or SRAM, is a volatile semiconductor memory category that stores each bit as a latch state and therefore does not require periodic refresh. A parallel SRAM belongs to the broader hierarchy of semiconductor memory, alongside ROM, DRAM, flash memory, and other volatile or nonvolatile storage. The HM628128LP-8 is positioned for systems requiring deterministic access, direct bus interfacing, and byte-wide memory rather than the high density or serial interface of more specialized memory devices.
Its principal specifications include a 131072-word by 8-bit organization, an 85 ns rated access time, CMOS technology, and a 32-pin plastic DIP package. The 0.8 μm Hi-CMOS implementation supports the device's stated combination of density, performance, and low power consumption. Because the memory is organized for eight-bit parallel operation, the associated system bus must present and latch eight data lines for each addressed word.
In a typical processor or controller system, the SRAM provides temporary storage for variables, buffers, stack or working memory, and intermediate data that must be accessed rapidly. Its parallel architecture simplifies connection to older microprocessor and embedded-controller buses, while the 85 ns timing provides a defined maximum access interval for synchronous memory-control logic. Exact address timing, setup requirements, and power-state limits should be implemented according to the manufacturer datasheet.
Typical uses include industrial control systems, legacy embedded platforms, data-acquisition equipment, communication modules, and compact controller boards that retain a parallel SRAM interface. It can also serve as expansion memory when a controller lacks sufficient internal RAM. Selection should account for package footprint, bus width, access timing, supply voltage, and signal levels, because memory components with the same storage capacity are not necessarily interchangeable.
The most important PCB-design issue is preserving signal integrity across the address, data, and control lines. Place the device close to the memory controller when possible, route the bus systematically, and decouple each supply connection near the package. Because this is a legacy PDIP device intended for through-hole assembly, designers should also verify board spacing, pin orientation, and any daughter-card or socket constraints before committing the footprint.
This product page combines the published memory organization, access time, technology, and package information with drop-in replacement analysis, application guidance, comparison parameters, and practical integration notes. It is intended to help engineers determine whether HM628128LP-8 fits an existing parallel-memory design and what must be checked before substitution or PCB reuse.
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