EconoRAM

Neither the DS2223 or DS2224 are available for new designs.

The DS2223 and DS2224 EconoRAMs are fully static, micropowered, read/write memories in low-cost TO-92 or SOT-223 packages. The DS2223 is organized as a serial 256 x 1-bit static read/write memory. The DS2224's first 32 bits are lasered with a unique ID code at the time of manufacture; the remaining 224 bits are static read/write memory. Signaling necessary for reading or writing is reduced to just one interface lead.

* Low-cost, general-purpose, 256-bit memory

* DS2223 has 256-bit SRAM

* DS2224 has 32-bit ROM, 224-bit SRAM

* Reduces control, address, and data interface to a single pin

* Each DS2224 32-bit ROM is factory-lasered with a unique serial number

* DS2224 portion of ROM with custom code and unique serial number available

* Minimal operating power: 45 nanocoulombs per transaction at 1.5V typical

* Less than 15nA standby current at +25°C

* Nonvolatile data retention easily achieved by low-cost alkaline batteries or capacitors

* Directly connects to a port pin of popular microcontrollers

* Operation from 1.2V to 5.5V

* Popular TO-92 or SOT-223 surface mount package

* Operates over industrial temperature range -40°C to +85°C