HB52E328EM-A6B and HB52E329EM are 8-byte DIMM (Dual In-line Memory Module) produced by Elpida Memory, which are optimized main memory solutions for 8-byte processor applications.
The HB52E328EM and HB52E329EM are 256 MB unbuffered SDRAM DIMM modules designed for 8‑byte processor applications. They use a 168‑pin dual‑lead‑out package, operate at 3.3 V, and support a maximum clock frequency of 100 MHz. The modules provide either a 64‑bit non‑parity data bus (HB52E328EM) or a 72‑bit ECC data bus (HB52E329EM) and feature LVTTL signal levels.
Key features include auto‑refresh and self‑refresh capabilities, programmable burst lengths (1, 2, 4, 8), four independent banks, and byte‑mask control. The datasheet also contains pin‑out tables, handling cautions, and usage guidelines for high‑reliability applications.
| Memory capacity | 256 MB |
|---|---|
| Package type | 168‑pin dual lead out |
| Supply voltage | 3.3 V |
| Maximum clock frequency | 100 MHz (max) |
| Data bus width | 64 bit (HB52E328EM) / 72 bit ECC (HB52E329EM) |
| Number of banks | 4 banks (simultaneous operation) |
The modules operate from a 3.3 V power supply.
The maximum clock frequency is 100 MHz.
Each module has four banks that can operate simultaneously and independently.
The module uses an LVTTL interface.