DS2223

DS2223/DS2224 DS2223/DS2224 EconoRAM FEATURES PACKAGE OUTLINE TO–92 Low–cost, general–purpose, 256–bit memory – DS2223 has 256–bit SRAM – DS2224 has 32–bit ROM, 224–bit SRAM Reduces single pin control, address and data interface to a 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 SOT–223 1 1 2 3 Minimal operating power: 45 nanocoulombs per transaction @1.5V typical Less than 15 nA standby current at 25°C Nonvolatile data 1 2 3 2 BOTTOM VIEW See Mech. Drawings Section 4 3 retention easily achieved via low– cost alkaline batteries or capacitors lers Directly connects to a port pin of popular microcontrol 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 TOP VIEW See Mech. Drawings Section PIN CONNECTIONS Pin 1 Pin 2 Pin 3 Pin 4 GND DQ VCC GND – – – – Ground Data In/Out Supply Ground 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. Both the DS2223 and DS2224 are not recommended for ne...