X84641

APPLICATION NOTE A V A I L A B L E AN95 AN103 AN107 16K/64K/128K X84161/641/129 µ Port Saver EEPROM DESCRIPTION MPS™ EEPROM FEATURES Up to 10MHz data transfer rate 25ns Read Access Time Direct Interface to Microprocessors and Microcontrollers —Eliminates I/O port requirements —No interface glue logic required —Eliminates need for parallel to serial converters Low Power CMOS —1.8V–3.6V, 2.5V–5.5V and 5V ±10% Versions —Standby Current Less than 1µA —Active Current Less than 1mA Byte or Page Write Capable —32-Byte Page Write Mode Typical Nonvolatile Write Cycle Time: 2ms High Reliability —100,000 Endurance Cycles —Guaranteed Data Retention: 100 Years The µPort Saver memories need no serial ports or special hardware and connect to the processor memory bus. Replacing bytewide data memory, the µPort Saver uses bytewide memory control functions, takes a fraction of the board space and consumes much less power. Replacing serial memories, the µPort Saver provides all the serial benefits, such as low cost, low power, low voltage, and small package size while releasing I/Os for more important uses. The µPort Saver memory outputs data within 25ns of an active read signal. This is less than the read access time of most hosts and provides “no-wait-state” operation. This prevents bottlenecks on the bus. With rates to 10 MHz, the µPort Saver supplies data faster than required by most host read cycle specifications. This eliminates the need for software NOPs. The µPort S...