24LC21A - Microchip

The pictures are for reference only, and the specific specifications can be found in the product manual.

Part No

24LC21A
Manufacturer

Microchip
ChipWorker Part#

CW480837540
Category

EEPROM IC Chip
Package

-
Description

1K 2.5V Dual Mode I2C⑩ Serial EEPROM
Documentation

Datasheet

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24LC21A Specifications

Attribute	Attribute Value

Part Number	24LC21A
Manufacturer	Microchip
ChipWorker Part#	CW480837540
Category	EEPROM IC Chip
Documentation	Datasheet
Case/Package	-
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Product Lifecycle Status	Active
RoHS	RoHS Compliant

Product Description

Description
The Microchip Technology Inc. 24LC21A 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, sending a serial bit stream of the memory array from 00h to 7Fh, clocked by the VCLK pin. A valid high-to-low transition on the SCL pin will cause the device to enter the transition mode, and look for a valid control byte on the I2C 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 24LC21A is available in a standard 8-pin PDIP and SOIC package in both commercial and industrial temperature ranges.
Features
• Single supply with operation down to 2.5V
• Completely implements DDC1™/DDC2™ interface for monitor identification, including recovery to DDC1
• Pin and function compatible with 24LC21
• Low-power CMOS technology
- 1 mA typical active current
- 10 µA 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)
• 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
- Commercial (C): 0°C to +70°C
- Industrial (I): -40°C to +85°C

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