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The Microchip Technology Inc. 25AA040/25LC040/25C040 (25xx040*) is a 4K bit serial Electrically Eras-able PROM.The memory is accessed via a simple Serial Peripheral Interface (SPI) compatible serial bus.The bus signals required are a clock input (SCK) plus separate data in(SI) and data out(SO) lines. Access to the device is controlled through a chip select (CS) input.
Communication to the device can be paused via the hold pin (HOLD). While the device is paused, transi-tions on its inputs will be ignored, with the exception of chip select, allowing the host to service higher priority interrupts. Also, write operations to the device can be disabled via the write protect pin (WP).
25AA040 Maximum Ratings
Vcc ...................................................................................7.0V All inputs and outputs w.r.t. Vss.................. 0.6V to Vcc+1.0V Storage temperature .....................................-65°C to 150 Ambient temperature under bias................... -65°C to 125 Soldering temperature of leads (10 seconds) .............+300 ESD protection on all pins.................................................4kV
25AA040 Features
* Low power CMOS technology - Write current: 3 mA typical - Read current: 500 A typical - Standby current: 500 nA typical * 512 x 8 bit organization * 16 byte page * Write cycle time: 5ms max. * Self-timed ERASE and WRITE cycles * Block write protection - Protect none, 1/4, 1/2, or all of array * Built-in write protection - Power on/off data protection circuitry - Write enable latch - Write protect pin * Sequential read * High reliability - Endurance: 10M cycles (guaranteed) - Data retention: > 200 years - ESD protection: > 4000 V * 8-pin PDIP, SOIC, and TSSOP packages * Temperature ranges supported: - Commercial: (C) 0 C to +70 C - Industrial: (I) -40 C to +85 C - Automotive: (E) (25C040) -40 C to +125 C