DESCRIPTION

The DS2223 and DS2224 EconoRAMs are fully static, micro–powered, 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.

FEATURES

• 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 @1.5V typical

• Less than 15 nA standby current at 25°C

• Nonvolatile data retention easily achieved via low–cost alkaline batteries or capacitors

• Directly connects to a port pin of popular microcontrollers

• Operation from 1.2 to 5.5 volts

• Popular TO–92 or SOT–223 surface mount package

• Operates over industrial temperature range –40°C to +85°C