The CDP1823 and CDP1823C are 128-word by 8-bit CMOS SOS static random-access memories. These memories are compatible with general-purpose microprocessors. The two memories are functionally identical. They differ in that the CDP1823 has a recommended operating voltage range of 4V to 10.5V, and the CDP1823C has a recommended operating voltage range of 4V to 6.5V.