admin 发表于 2010-4-24 10:58:47

24LC22A Data Sheet

http://www.microchip.com/stellent/images/mchpsiteimages/dwnfolder.gif24LC22A Data Sheet


The Microchip Technology Inc. 24LC22A is a 256 x 8- bit dual-mode Electrically Erasable PROM. This device is designed for use in applications requiring storage and serial transmission of configuration and control information. Two modes of operation have been implemented: Transmit-Only mode (1 Kbit) and Bidirectional mode (2 Kbit). Upon power-up, the device will be in the Transmit-Only mode, sending a serial bit stream of the memory array from 00h to 7Fh, clocked by the VCLK pin. A valid high-to-low transition on the SCL pin will cause the device to enter the Transition mode, and look for a valid control byte on the I2C™Compatible bus. If it detects a valid control byte from the master, it will switch into Bidirectional mode, with byte selectable read/write capability of the entire 2K memory array using SCL. If no control byte is received, the device will revert to the Transmit-Only mode after it receives 128 consecutive VCLK pulses while the SCL pin is idle. The 24LC22A is available in standard 8-pin PDIP and SOIC packages.

参数名称数值
Density2k bits (x8)
Max. Clock Freq.400 kHz
Page Size (bytes)8
Endurance1,000,000
Op. Volt Range (V)2.5 to 5.5
Temp Range (°C)-40°C to +85°C

   特性
Single Supply with Operation Down to 2.5V
Supports Enhanced EDID™ (E-EDID™) 1.3
Completely Implements DDC1™/DDC2™
Interface for Monitor Identification, Including
Recovery to DDC1
2 Kbit Serial EEPROM Low-Power CMOS
Technology:
2-Wire Serial Interface Bus, I2C™ Compatible
100 kHz (2.5V) and 400 kHz (5V) Compatibility
Self-Timed Write Cycle (including Auto-Erase)
Page-Write Buffer for up to Eight Bytes
1,000,000 Erase/Write Cycles
Data Retention >200 years


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