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PCF8570TD-T

製品説明
仕様・特性

EEPROM & RAM I2C Serial EEPROM and RAM I2C Slave Address 1 0 1 0 FIXED A2 A1 A0 or or or R/W Block# Block# Block# PROGRAMMABLE PCA8581/8581(C) PCF8570/82/94/98/102/116 Semiconductors 0 0 1 FIXED 0 A2 A1 A0 R/W PROGRAMMABLE PCF85103 Description The Philips family of I2C bus compatible memories comprises RAM, EEPROM, video memories and Flash memories. Small size serial memories (RAM and EEPROM) are fairly common and widely used in many different applications. EEPROM is particularly useful in applications where data retention during power-off is essential. Such applications include but are not limited to: meter readings, electronic key, product identification number, serial presence detect (SPD) on DIMMs, etc. A common pinning is used for these serial memories because their functionality is very similar.The common pinout was selected to allow interchangeability. EEPROMs store data (2 Kbits organized in 256 X 8 in the PCF8582C-2 for example), including set points, temperature, alarms, DIMM information and more, for a guaranteed minimum storage time of ten years in the absence of power. EEPROMs can change values up to 1,000,000 times and have an infinite number of read cycles, while consuming only 10 micro Amperes of current. RAM—Random Access Memory • The PCF8570 is organized as 256 words of 8-bytes. EEPROM—EEPROM is Electrically Erasable Programmable Read Only Memory • • • • • The PCF8581/8581C is organized as 128 words of 8-bytes. The PCF8582C-2 is organized as 256 words of 8-bytes. The PCF8594C-2 is organized as 512 words of 8-bytes in two 256 word pages. The PCF8598C-2 is organized as 1024 words of 8-bytes in four 256 word pages. The PCF85116-3 is organized as 2048 words of 8-bytes in eight 256 word pages. The PCF8582C-2 is pin and address compatible with the PCF8570 and PCA8581.The PCF85102C-2 is identical to the PCF8582C-2, with pin 7 (Programming Time Control output) as a no connect, to allow it to be used in competitors’ sockets, since PTC should be left floating or held at VCC. The PCF85103C-2 is identical to the PCF8582C-2 except that the fixed I2C address is different, allowing up to eight of each device to be used on the same I2C bus. Addresses and data are transferred serially via a two-wire bi-directional bus (I2C-bus).The built-in word address register is incremented automatically after each written or read data byte.All bytes can be read in a single operation. Up to 8 bytes can be written in one operation, reducing the total write time per byte. The 512-byte, 1024-byte and 2048-byte EEPROMs use the programmable address (Ax or Block #) to either select the slave address or one of the 256 word pages (e.g., the PCF8594C-2 has two addressable pages with up to four devices allowed on the same I2C bus while the PCF85116-3 has eight addressable pages but only one device is allowed on the same I2C bus). EEPROM/RAM Features • • • • • • • • • • • • Wide voltage range of 2.5 V to 5.5V Internal non-volatile registers (except PCF8570) with a minimum of 1,000,000 write cycles at Tambient = 22 ºC Infinite number of read cycles 10 year data retention (Minimum) Low power CMOS devices Non volatile storage from 128x8-bit to 2048x8-bit Write operation per byte or per 8-byte page Read operation can be sequential or random Internal timer for writing operation (no external components required) Internal Power On Reset High reliability by using redundant EEPROMS cells Offered in 8-pin DIP (N) and SO (D) packages Key Points • • The I2C bus is used to read and write information to and from the memory A wide voltage range minimizes the number of EEPROMs that need to be stocked

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