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MicrochipTechnology - 1K2.5VDualModeI2CSerialEEPROM

Numéro de référence 24LC21A-IP
Description 1K2.5VDualModeI2CSerialEEPROM
Fabricant MicrochipTechnology 
Logo MicrochipTechnology 





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24LC21A-IP fiche technique
24LC21A
1K 2.5V Dual Mode I2CSerial EEPROM
FEATURES
• Single supply with operation down to 2.5V
• Completely implements DDC1/DDC2
interface for monitor identification, including recov-
ery 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, I2Ccompatible
• 100 kHz (2.5V) and 400 kHz (5V) compatibility
• Self-timed write cycle (including auto-erase)
• Page-write buffer for up to eight bytes
• 10,000,000 erase/write cycles guaranteed
• 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
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 imple-
mented: 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 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 Bi-directional 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.
PACKAGE TYPES
PDIP
NC 1
NC 2
NC 3
VSS 4
SOIC
8 VCC
7 VCLK
6 SCL
5 SDA
NC 1
NC 2
NC 3
VSS 4
BLOCK DIAGRAM
8 VCC
7 VCLK
6 SCL
5 SDA
HV GENERATOR
I/O
CONTROL
LOGIC
MEMORY
CONTROL
LOGIC
XDEC
SDA SCL
VCLK
VCC
VSS
EEPROM
ARRAY
PAGE LATCHES
YDEC
SENSE AMP
R/W CONTROL
DDC is a trademark of the Video Electronics Standards Association.
I2C is a trademark of Philips Corporation.
© 1996 Microchip Technology Inc.
Preliminary
This document was created with FrameMaker 4 0 4
DS21160B-page 1

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