24LCS21A Series

1Kb I2C Serial EEPROM for DDC1™/DDC2™ Monitor Identification

Catalog

1Kb I2C Serial EEPROM for DDC1™/DDC2™ Monitor Identification

Part	Memory Type	Memory Depth	Memory Width	Voltage - Supply (Minimum)	Voltage - Supply (Maximum)	Package Name	Package Length	Package Width	Memory Format	Write Cycle Time - Word	Write Cycle Time - Page	Mounting Type	Operating Temperature (Max)	Operating Temperature (Min)	Memory Size	Clock Frequency	Access Time	Technology	Memory Interface (Type)
Microchip Technology 24LCS21A-I/P	Non-Volatile	128	8 bit	2.5 V	5.5 V	8-DIP 8-PDIP	0.3 in	7.62 mm	EEPROM	10 ms	10 ms	Through Hole	85 °C	-40 °C	1 Kbit	400 kHz	900 ns	EEPROM	I2C
Microchip Technology 24LCS21AT/SN	Non-Volatile	128	8 bit	2.5 V	5.5 V	8-SOIC	0.154 in	3.9 mm	EEPROM	10 ms	10 ms	Surface Mount	70 °C	0 °C	1 Kbit	400 kHz	900 ns	EEPROM	I2C
Microchip Technology 24LCS21AT-I/SN	Non-Volatile	128	8 bit	2.5 V	5.5 V	8-SOIC	0.154 in	3.9 mm	EEPROM	10 ms	10 ms	Surface Mount	85 °C	-40 °C	1 Kbit	400 kHz	900 ns	EEPROM	I2C
Microchip Technology 24LCS21A-I/SNG	Non-Volatile	128	8 bit	2.5 V	5.5 V	8-SOIC	0.154 in	3.9 mm	EEPROM	10 ms	10 ms	Surface Mount	85 °C	-40 °C	1 Kbit	400 kHz	900 ns	EEPROM	I2C
Microchip Technology 24LCS21A/P	Non-Volatile	128	8 bit	2.5 V	5.5 V	8-DIP 8-PDIP	0.3 in	7.62 mm	EEPROM	10 ms	10 ms	Through Hole	70 °C	0 °C	1 Kbit	400 kHz	900 ns	EEPROM	I2C
Microchip Technology 24LCS21A/SN	Non-Volatile	128	8 bit	2.5 V	5.5 V	8-SOIC	0.154 in	3.9 mm	EEPROM	10 ms	10 ms	Surface Mount	70 °C	0 °C	1 Kbit	400 kHz	900 ns	EEPROM	I2C
Microchip Technology 24LCS21A-I/SN	Non-Volatile	128	8 bit	2.5 V	5.5 V	8-SOIC	0.154 in	3.9 mm	EEPROM	10 ms	10 ms	Surface Mount	85 °C	-40 °C	1 Kbit	400 kHz	900 ns	EEPROM	I2C

Catalog

1Kb I2C Serial EEPROM for DDC1™/DDC2™ Monitor Identification

Description

The Microchip Technology Inc. 24LCS21A is a 128 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 and Bidirectional mode. Upon power-up, the device will be in the Transmit-Only mode, a valid high-to-low transition on the SCLpin 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 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 24LCS21A also enables the user to write-protect the entire memory array using its write-protect pin. The 24LCS21A is available in a standard 8-pin PDIP and SOIC package in industrial temperature range.