24LCS21A Series

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

Catalog

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

Part	Mounting Type	Supplier Device Package	Technology	Memory Organization	Memory Format	Write Cycle Time - Word, Page	Memory Size	Package / Case	Package / Case [y]	Package / Case [x]	Operating Temperature [Max]	Operating Temperature [Min]	Access Time	Memory Interface	Memory Type	Voltage - Supply [Min]	Voltage - Supply [Max]	Clock Frequency	Package / Case	Package / Case
Microchip Technology 24LCS21AT/SN	Surface Mount	8-SOIC	EEPROM	128 x 8	EEPROM	10 ms	128 B	8-SOIC	3.9 mm	0.154 in	70 °C	0 °C	900 ns	I2C	Non-Volatile	2.5 V	5.5 V	400 kHz
Microchip Technology 24LCS21AT-I/SN	Surface Mount	8-SOIC	EEPROM	128 x 8	EEPROM	10 ms	128 B	8-SOIC	3.9 mm	0.154 in	85 °C	-40 °C	900 ns	I2C	Non-Volatile	2.5 V	5.5 V	400 kHz
Microchip Technology 24LCS21A-I/SNG	Surface Mount	8-SOIC	EEPROM	128 x 8	EEPROM	10 ms	128 B	8-SOIC	3.9 mm	0.154 in	85 °C	-40 °C	900 ns	I2C	Non-Volatile	2.5 V	5.5 V	400 kHz
Microchip Technology 24LCS21A/P	Through Hole	8-PDIP	EEPROM	128 x 8	EEPROM	10 ms	128 B	8-DIP			70 °C	0 °C	900 ns	I2C	Non-Volatile	2.5 V	5.5 V	400 kHz	0.3 in	7.62 mm
Microchip Technology 24LCS21A/SN	Surface Mount	8-SOIC	EEPROM	128 x 8	EEPROM	10 ms	128 B	8-SOIC	3.9 mm	0.154 in	70 °C	0 °C	900 ns	I2C	Non-Volatile	2.5 V	5.5 V	400 kHz
Microchip Technology 24LCS21A-I/SN	Surface Mount	8-SOIC	EEPROM	128 x 8	EEPROM	10 ms	128 B	8-SOIC	3.9 mm	0.154 in	85 °C	-40 °C	900 ns	I2C	Non-Volatile	2.5 V	5.5 V	400 kHz

Catalog

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

Key Features

• * Single Supply with Operation Down to 2.5V

• * Completely Implements DDC1™/DDC2™ Interface

• for Monitor Identification, Including Recovery

• to DDC1

• * Low-Power CMOS Technology:

- 1 mA active current, typical

- 10 uA standby current, typical at 5.5V

• * 2-Wire Serial Interface Bus, I2C™ Compatible

• * 100 kHz (2.5V) and 400 kHz (5V) Compatibility

• * Self-Timed Write Cycle (including Auto-Erase)

• * Hardware Write-Protect Pin

• * Page Write Buffer for up to Eight Bytes

• * 1,000,000 Erase/Write Cycles Ensured

• * Data Retention > 200 years

• * ESD Protection > 4000V

• * 8-pin PDIP and SOIC Package

• * Available for Extended Temperature Ranges:

- Industrial (I): -40°C to +70°C

• * Pb-Free and RoHS Compliant

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.