DS2224

Features:

• Lowcost, generalpurpose, 256bit memory
   DS2223 has 256bit SRAM
   DS2224 has 32bit ROM, 224bit SRAM
• Reduces control, address and data interface to a single pin
• Each DS2224 32bit ROM is factorylasered 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 TO92 or SOT223 surface mount package
• Operates over industrial temperature range 40°C to +85°C


Pinout




Specifications

Voltage on Any Pin Relative to Ground       0.5V to +6.5V
Operating Temperature                             40 to +85
Storage Temperature                              55 to +125
Soldering Temperature                       260 for 10 seconds


Description

The DS2223 and DS2224 EconoRAMs are fully static, micropowered, read/write memories in lowcost TO92 or SOT223 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 new designs. However, the parts will remain available until the year 2003, at least.