I2C serial EEPROMs

Small size serial memories (RAM and EEPROM) are fairly common and widely used in many different applications. EEPROMs are 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, and Serial Presence Detect (SPD) on DIMMs. 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 (2Kbits organized in 256 X 8 in the PCF8582C-2 for example), such as set points, temperature, alarms, and DIMM information 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.

The PCA8582C-2 is pin and address compatible with the PCF8570 and PCF8581. 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 V_CC. 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. The PCA9558 and PTN3500/01 are general purpose I/O expanders with embedded 2k-bit EEPROMs.

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).

• The PCF8570 is organized as 256 words of 8-bytes

• The PCA8581/8581C is organized as 128 words of 8-bytes
• The PCF8582C-2/102C-2 and 103C-2 are 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

• Internal non-volatile registers (except PCA8570) with a minimum of 1,000,000 write cycles at T_ambient = 22^oC
• 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

The PCA94S08 is an 8-kbit Electrically Erasable and Programmable Read-Only Memory (EEPROM) with access permissions, set via the I2C bus, that isolate memory blocks from unauthorized or inadvertent reads or writes. The user sets protection bits that control access to the individual memory blocks and also sets optional sticky bits that prevent the protection bits from changing. The PCA24S08 is pin-compatible with industry standard 24C08 serial EEPROMs, allowing users to replace existing devices and incorporate this access protection feature during redesign or board respin.

Product(s)
PCF8570	2.5 to 6V	3	1	2K	N/A	-40 to +85oC	100kHz

Click for datasheet. Also, see datasheet disclaimer.
, , indicate product status. Click or for more or less detail.

	PCA24S08		1024 x 8-Bit CMOS EEPROM with Access Protection
	PCA8581		128 x 8-Bit EEPROM with I2C Bus Interface
	PCA8581C		128 x 8-Bit EEPROM with I2C Bus Interface
	PCF8570		256 x 8-Bit Static Low-Voltage RAM with I2C Bus Interface
	PCF8582C-2		256 x 8-Bit CMOS EEPROM with I2C Bus Interface
	PCF8594C-2		512 x 8-Bit CMOS EEPROM with I2C Bus Interface
	PCF8598C-2		1024 x 8-Bit CMOS EEPROM with I2C Bus Interface
	PCF85102C-2		256 x 8-Bit CMOS EEPROM with I2C Bus Interface
	PCF85103C-2		256 x 8-Bit CMOS EEPROM with I2C Bus Interface
	PCF85116-3		2048 x 8-Bit CMOS EEPROM with I2C Bus Interface

Click for datasheet. Also, see datasheet disclaimer.
, , indicate product status. Click or for more or less detail.

	PCA9500		8-Bit I2C I/O Port with 2-Kbit EEPROM
	PCA9501		8-Bit I2C I/O Port with Interrupt, 2-Kbit EEPROM, and Six Address Pins
	PCA9558		5-Bit Multiplexed/1-Bit Latched 6-Bit I2C EEPROM and Octal SMBus Registered Interface with 256-Byte I2C EEPROM
	PCA9559		5-Bit Multiplexed/1-Bit Latched 6-Bit I2C EEPROM
	PCA9560		Dual 5-Bit Multiplexed 1-Bit Latched I2C EEPROM
	PCA9561		Quad 6-Bit Multiplexed I2C EEPROM

	Highly accurate system tuning with flexible, easy-to-program EEPROMs NXP dual 5-bit and quad 6-bit multiplexed I2C-bus/SMBus EEPROMs PCA9560/61 © February 2008; English; Ordering code: 9397 750 16179
	Your complete choice for I2C-bus peripherals Our invention, your solution to everyday design challenges © December 2007; English; Ordering code: 9397 750 15669
	Non-volatile I2C-bus memories from 128 x 8-bit to 2048 x 8-bit NXP I2C-bus EEPROMs and RAMs © August 2007; English; Ordering code: 9397 750 16091
	I2C-bus EEPROM DIP switch for easy system management NXP 5-bit multiplexed / 1-bit latched 6-bit I2C-bus EEPROM PCA9559 © August 2007; English; Ordering code: 9397 750 16090
	Multi-function I2C-bus device simplifies board configuration NXP 6-bit I2C-bus DIP switch with integrated 8-bit GPIO and 2K EEPROM © August 2007; English; Ordering code: 9397 750 16089
	Jumperless configuration of PC motherboards NXP 4-bit muxed/1-bit latched I2C-bus EEPROM DIP switch PCA8550 © Aug 2007; English; Ordering code: 9397 750 16082
	Combination GPIO expanders and EEPROMs for smaller boards NXP 8-bit I2C/SMBus GPIO expanders with 2-K EEPROM PCA9500/01 © June 2007; English; Ordering code: 9397 750 16018
	Pin-for-pin replacement for 24C08 serial EEPROM with access protection NXP 1024 x 8-bit CMOS EEPROM PCA24S08 with access protection © May 2007; English; Ordering code: 9397 750 15967