The NEC UPD42S16800L series is a 3.3 V, 2 M‑word × 8‑bit dynamic CMOS RAM with fast page mode. The document lists several part numbers (UPD42S16800L, uPD42S17800L, etc.) that differ in refresh cycles and package types.
Key sections include a description of the memory organization, ordering information, pin configurations for 28‑pin TSOP and SOJ packages, electrical specifications, recommended operating conditions, DC characteristics, and recommended soldering conditions. The datasheet also provides mechanical dimensions and package drawings.
| Memory capacity | 2,097,152 words × 8 bits |
|---|---|
| Supply voltage (recommended) | 3.0 V – 3.6 V |
| Supply voltage (absolute max) | 0.5 V – 4.6 V |
| Power dissipation | 1 W |
The recommended supply voltage is 3.0 V to 3.6 V.