25AA256,25LC256 Device Data Sheet
http://www.microchip.com/stellent/images/mchpsiteimages/dwnfolder.gif25AA256/25LC256 Device Data SheetThe Microchip Technology Inc. 25AA256/25LC256 (25XX256*) are 256 Kbit Serial Electrically Erasable PROMs. 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, transitions on its inputs will be ignored, with the exception of Chip Select, allowing the host to service higher priority interrupts. The 25XX256 is available in standard packages including 8-lead PDIP and SOIC, and advanced packaging including 8-lead DFN and 8-lead TSSOP
参数名称数值
Density256K bits (x8)
Max. Clock Freq.10 MHz
Page Size (bytes)64
Write ProtectQuarter, Half, Whole Array
Endurance1,000,000
Op. Volt Range (V)1.8 to 5.5
Temp Range (°C)-40°C to +85°C
特性
Max. Clock 10 MHz
Low-Power CMOS Technology:
- Max. Write Current: 5 mA at 5.5V, 10 MHz
- Read Current: 6 mA at 5.5V, 10 MHz
- Standby Current: 1 μA at 5.5V
32,768 x 8-bit Organization
64-Byte Page
Self-Timed Erase and Write Cycles (5 ms max.)
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: 1,000,000 erase/write cycles
- Data retention: > 200 years
- ESD protection: > 4000V
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