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MicrochipTechnology - 1K2.5VDualModeI2CSerialEEPROM

Numéro de référence 24LC21-SN
Description 1K2.5VDualModeI2CSerialEEPROM
Fabricant MicrochipTechnology 
Logo MicrochipTechnology 





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24LC21-SN fiche technique
24LC21
1K 2.5V Dual Mode I2CSerial EEPROM
FEATURES
• Single supply with operation down to 2.5V
• Completely implements DDC1/DDC2inter-
face for monitor identification
• Low power CMOS technology
- 1 mA active current typical
- 10 µA standby current typical at 5.5V
• 2-wire serial interface bus, I2Ccompatible
• Self-timed write cycle (including auto-erase)
• Page-write buffer for up to 8 bytes
• 100 kHz (2.5V) and 400 kHz (5V) compatibility
• Factory programming (QTP) available
• 1,000,000 erase/write cycles guaranteed
• Data retention > 200 years
• 8-pin PDIP and SOIC package
• Available for extended temperature ranges
- Commercial (C):
- Industrial (I):
0˚C to +70˚C
-40˚C to +85˚C
DESCRIPTION
The Microchip Technology Inc. 24LC21 is a 128 x 8 bit
Electrically Erasable PROM. This device is designed for
use in applications requiring storage and serial trans-
mission of configuration and control information. Two
modes of operation have been implemented: Transmit
Only Mode and Bi-Directional Mode. Upon power-up,
the device will be in the Transmit Only Mode, sending a
serial bit stream of the entire memory array contents,
clocked by the VCLK pin. A valid high to low transition
on the SCL pin will cause the device to enter the
Bi-Directional Mode, with byte selectable read/write
capability of the memory array. The 24LC21 is available
in a standard 8-pin PDIP and SOIC package in both
commercial and industrial temperature ranges.
PACKAGE TYPES
PDIP
NC 1
NC 2
NC 3
VSS 4
SOIC
NC 1
NC 2
NC 3
VSS
4
8 VCC
7 VCLK
6 SCL
5 SDA
8 VCC
7 VCLK
5 SCL
5 SDA
BLOCK DIAGRAM
VCLK
HV GENERATOR
I/O
CONTROL
LOGIC
MEMORY
CONTROL
LOGIC
XDEC
SDA SCL
EEPROM
ARRAY
PAGE LATCHES
YDEC
VCC SENSE AMP
VSS R/W CONTROL
DDC is a trademark of the Video Electronics StandarDs Association.
I2C is a trademark of Philips Corporation.
© 1996 Microchip Technology Inc.
This document was created with FrameMaker 4 0 4
DS21095F-page 1

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