0S2223/DS2224 DALLAS DS2223/DS2224 SEMICONDUCTOR EconoRAM FEATURES PACKAGE OUTLINE Low-cost, general-purpose, 256-bit memory TO-92 DS2223 has 256bit SRAM DS2224 has 32-bit ROM, 224bit 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 25C Nonvoiatile data retention easily achieved via low cost alkaline batteries or capacitors Directly connects to a port pin of popular microcontrol- lers Operation from 1.2 to 5.5 valts Popular TO-92 or SOT-223 surface mount package Operates over industrial temperature range 40C to +85C DESCRIPTION The 082223 and DS2224 EconoRAMs are fully static, micro~powered, read/write memories in low-cost TO-92 or SOT-223 packages. The DS2223 is orga- nized as a serial 256 x 1 bit static read/write memory. The 0S2224'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. SOT-223 1 2 4 3 BOTTOM VIEW TOP VIEW See Mech. Drawings See Mech. Drawings Section Section PIN CONNECTIONS Pin 1 GND ~ Ground Pin 2 DQ ~ Data In/Out Pins Vee ~- Supply Pin 4 GND ~ Ground ORDERING INFORMATION 0$2223 256bit SRAM ~ TO-92 Package DS2223Z 256-bit SRAM SOT-223 Package DS2223T 1000 piece tapeand-reel of DS2223 DS2223Y 2500 piece tapeand-reel of DS22232 DS2224 32-bit serial number (ROM), 224bit SRAM TO-92 Package DS2224Z2 32-bit serial number (ROM), 224~bit SRAM SOT-223 Package DS2224T 1000 piece tapeandreel of DS2224. DS2224Y 2500 piece tapeand-reei of DS2224Z 118