24LC21A/P More Semiconductors - ICs by Microchip Technology

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

Status: Active
Series: 24LC21A
RoHS: Compliant
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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.

Where to Buy

Prices starting from US$0.61

Distributor Stock
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Newark
from US$0.62
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Avnet America
from US$0.61
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Logo for RS Americas
RS Americas
from US$0.85
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Avnet Silica
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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

Specifications

Density (Organization) 1K bits (x8)
Operating Voltage Min. (V) 2.5
Oper Voltage Max (V) 5.5
Max. Clock Freq. 400 kHz
Page Size (bytes) 8
Write Protected False
Write Protect Scheme None
Endurance 1,000,000

Resources


Application Notes
AN974 - Interfacing I2C™ Serial EEPROMs to PICmicro® Microcontrollers
AN976 - Using the MSSP Module to Interface I2C? Serial EEPROMs with PIC16 Devices
AN979 - Interfacing I2C™ Serial EEPROMs to PIC18 Devices
AN982 - Interfacing I2C Serial EEPROMs to PIC10 and PIC12 Devices
AN989 - Using the MSSP Module to Interface I2C? Serial EEPROMs with PIC18 Devices
AN991 - Using the C18 Compiler and the MSSP to Interface I2C™ EEPROMs with PIC18 Devices
AN997 - Using the C18 Compiler to Interface I2C? Serial EEPROMs with PIC18 Devices
AN1019 - EEPROM Endurance Tutorial
AN1028 - Recommended Usage of Microchip I2C? Serial EEPROM Devices
AN1079 - Using the C30 Compiler and the I2C? Peripheral to Interface Serial EEPROMs with dsPIC33F
AN1100 - Using the C30 Compiler to Interface Serial EEPROMs with dsPIC33F
AN1113 - Using C and a Hardware Module to Interface 8051 MCUs with I2C Serial EEPROMs
AN1147 - Interfacing 8051 MCUs with I2C Serial EEPROMs
AN1190 - Using ASM and a Hardware Module to Interface 8051 MCUs with I2C(TM) Serial EEPROMs
AN1195 - Using C to Interface 8051 MCUs with I2C(TM) Serial EEPROMs
AN1418 - Adding Flexibility by Using Multiple Footprints for I2C Serial EEPROMs



Environmental Information

JEDEC Indicator e3
ROHS Compliant
China EFUP Compliant
Device Weight (g) 0.4867
Shipping Weight (kg) 0.9
Lead Count 8
Package Type PDIP
Package Width or Size .300in
Soldering Composition Matte Tin

Alternative Descriptions

Ic,serial Eeprom,128X8,cmos,dip,8Pin,plastic Rohs Compliant: Yes |Microchip 24LC21A/P | Newark Electronics
EEPROM Serial-I2C 1K-bit 128 x 8 3.3V/5V 8-Pin PDIP | Avnet America
Microchip 24LC21A/P EEPROM Memory, 1kb, 3500ns, 2.5 to 5.5 V 8-Pin PDIP | Microchip Technology Inc. 24LC21A/P | RS Americas


Frequently Asked Questions

Where can I find additional details, specifications and documents for a 24LC21A/P?

Additional datasheets, footprints and schematics for 24LC21A/P are listed on our Part Details page. You can also find images and similar parts to 24LC21A/P on this page.

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What category does 24LC21A/P fall under?

The 24LC21A/P is listed under Semiconductors - ICs > More Semiconductors - ICs.

Can I view similar or alternative parts?

You can view similar parts to 24LC21A/P when available in the More Semiconductors - ICs range under the specifications section at the bottom of the details page.

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Submit any questions directly to the customer support team of the distributor listing the product. For the 24LC21A/P you can contact the distributor directly for product support, shipping queries etc.

Is the 24LC21A/P RoHS compliant?

Yes. This part has been flagged as RoHS Compliant by Microchip Technology.

Which authorised distributors for 24LC21A/P have stock available?

Authorised distributors including Newark Electronics, Avnet America, RS Americas and Avnet Silica have stock available or on a lead time for 24LC21A/P.

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