Description
The CDP1821C/3 is a 1024-word x 1-bit CMOS silicon-on-sapphire (SOS), fully static, random-access memory designed for use in CDP1800 microprocessor systems. This device has a recommended operating voltage range of 4V to 6.5V

FEATUREs
• Static CMOS Silicon-On-Sapphire Circuitry CD4000-Series Compatible
• Compatible with CDP1800-Series Microprocessors at Maximum Speed
• Fast Access Time. . . . . . . . . . . 100ns Typ. at VDD = 5V
• Single Voltage Supply
• No Precharge or External Clocks Required
• Low Quiescent and Operating Power
• Separate Data Inputs and Outputs
• High Noise Immunity . . . . . . . . . . . . . . . . . . 30% of VDD
• Memory Retention for Standby Battery Voltage Down to 2V at +25°C
• Latch-Up-Free Transient-Radiation Tolerance