This document describes the features and characteristics of the μPD43256B, a 256K-bit CMOS static RAM product, including high speed, low power, low voltage operation, and battery backup.
The document describes the NEC Electronics uPD43256B, a high speed, low power, and 262,144 bits (32,768 words by 8 bits) CMOS static RAM. The device supports battery backup options and is available in A and B versions for wide voltage operations ranging from 2.7V to 5.5V.
| Organization | 32,768 words by 8 bits |
|---|---|
| Capacity | 256K-bit (262,144 bits) |
| Access Time (Max) | 70 ns |
| Operating Voltage (A version) | 3.0 to 5.5 V |
| Operating Voltage (B version) | 2.7 to 5.5 V |
| Data Retention Voltage | 2.0 V (MIN.) |
| Operating Ambient Temperature | 0 to 70 °C |
The device is packed in 28-pin PLASTIC DIP, 28-pin PLASTIC SOP and 28-pin PLASTIC TSOP (I).
Yes, the datasheet states that battery backup is available.