CAT93C57LI-G

Series:	--
Packaging:	Tube
Part Status:	Obsolete
Memory Type:	Non-Volatile
Memory Format:	EEPROM
Technology:	EEPROM
Memory Size:	2Kb (256 x 8, 128 x 16)
Clock Frequency:	1MHz
Write Cycle Time - Word, Page:	--
Memory Interface:	SPI
Voltage - Supply:	1.8 V ~ 5.5 V
Operating Temperature:	-40°C ~ 85°C (TA)
Mounting Type:	Through Hole
Package / Case:	8-DIP (0.300", 7.62mm)
Supplier Device Package:	8-PDIP
Base Part Number:	CAT93C57

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Background

CAT93C57LI-G is a memory device made by supplier STMicroelectronics, which specifically is a 93C57LI-G EEPROM (electrically erasable programmable read-only memory). This type of device is an important element in the data protection and safety applications, within which contents of memory are stored securely, reliably, and non-volatile. Its characteristics, applications and principle of operation are detailed as following.

Characteristics of CAT93C57LI-G

CAT93C57LI-G has two-wire serial interface which is specified in I2C mode and one-wire serial interface which is specified in SPI mode. Its memory capacity is 512 bits organized as 32 eight-bit words and the extended temperature range is -40ºC to +85ºC with the package of SOIC. It comes with the features of internal write protection, free streaming data read, sequential reads, and random block write etc. It has proven to be robust and highly reliable in case of accidental system power loss.

Application field of CAT93C57LI-G

The CAT93C57LI-G EEPROM mainly applies to numerous industrial, automotive, consumer and computer applications. In terms of industrial control, this device can be used in electrical control systems and safety systems where its random block write, free streaming data read, and internal write protection function can prevent data leakage. For the consumers, CAT93C57LI-G provides basic data storage for automated text input and storage functions. In the automotive sector, engine control systems, maintenance recorders, abrasion sensors and navigation systems make use of it. Additionally, in the computer, CAT93C57LI-G is extensively utilized in hard disks, system initialization frames and configuration setting frames.

Working principle of CAT93C57LI-G

The working principle of CAT93C57LI-G revolves around how the data is written, modified and read from the memory. In order to write data into the memory, first we should write a configurable address pointer register to specify the starting address. Then the data is written sequentially to the blocks following the address pointed by the pointer register. We can also write data randomly (without using the pointer register) but only for one block.In terms of data read, the response to the command is to output the data from the memory from the selected address in sequential order. The data can be read in blocks of eight bits, with a fixed transition time of 0.25 ms between these blocks.When it comes to data modification, it must be written sequentially since it’s impossible to alter only one byte out of a block. The block write packet is used to change the data accordingly in the memory.

Conclusion

CAT93C57LI-G is a common and cost-effective EEPROM device, and it is widely used in various sectors with the features of free streaming data read, random block write and internal write protection. The operating principle is based on the I2C mode and/or SPI mode, which is easy to comprehend and use. In a nutshell, CAT93C57LI-G is a reliable, secure, and low-cost choice for applications in industrial, automotive, computer and consumer systems.

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