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24LC21A

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

Status: In Production

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
  • 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
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Overview
Documents
Development Environment
Similar Devices
RoHS Information
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Device Overview

Summary

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™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 24LC21A is available in a standard 8-pin PDIP and SOIC package in industrial temperature range.

Additional Features
  • Single Supply with Operation Down to 2.5V
  • Completely Implements DDC1™/DDC2™Interface for Monitor Identification, IncludingRecovery to DDC1
  • Pin and Function Compatible with 24LC21
  • Low-Power CMOS Technology
  • 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
Parametrics
Name
Value
Density
1K bits (x8)
Op. Volt Range (V)
2.5 to 5.5
Max. Clock Freq.
400 kHz
Page Size (bytes)
8
Temp Range (°C)
-40°C to +85°C
Endurance
1,000,000

Documents

Jump to:

Data Sheet

07/15/2008
337KB

Reference Manual

Product Line Card

Brochures

Video

Webinars

01/27/2010
31187KB
01/27/2010
38593KB
01/27/2010
33683KB

Development Environment

  • Demo & Evaluation Boards
  • Application Examples
Demo & Evaluation Boards
MPLAB Starter Kit for Memory Products
MPLAB Starter Kit for Memory Products ( DV243003 )

Designers of Serial EEPROM applications can enjoy the increased productivity, reduced time to market and rock-solid design that only a well thought out development system can provide. Microchip's MPLAB® Starter Kit for Serial Memory Products includes everything necessary to quickly develop a robust and reliable Serial EEPROM design, and greatly reduces the time required for system integration...

Learn More
Add To Cart
Serial EEPROM PIM PICtail Pack
Serial EEPROM PIM PICtail Pack ( AC243003 )

The Serial EEPROM PIM PICtail™ Modules are a series of boards designed around Microchip Serial EEPROM devices. The boards are designed to interface with the PICtail Plus connector as well as the MPLAB® Starter Kit for Serial Memory Products and the PICkit™ 2, allowing you to get started right out of the box.

Learn More
Add To Cart

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RoHS Information

Part Number
Device Weight (g)
Shipping Weight (Kg)
Lead Count
Package Type
Package Width
Solder Composition
JEDEC Indicator
RoHS
China EFUP
24LC21A-I/P
0.486700
0.900000
8
PDIP
.300in
Matte Tin
e3
24LC21A/P
0.486700
0.900000
8
PDIP
.300in
Matte Tin
e3
24LC21A-I/SN
0.078000
0.250000
8
SOIC
.150In(3.90mm)
Matte Tin
e3
24LC21AT/SN
0.078000
0.230303
8
SOIC
.150In(3.90mm)
Matte Tin
e3
24LC21AT-I/SN
0.078000
0.230303
8
SOIC
.150In(3.90mm)
Matte Tin
e3
24LC21A/SN
0.078000
0.250000
8
SOIC
.150In(3.90mm)
Matte Tin
e3
To see a complete listing of RoHS data for this device, please Click here
Shipping Weight = Device Weight + Packing Material weight. Please contact sales office if device weight is not available.

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