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24LC21AT

Description
128 X 8 I2C/2-WIRE SERIAL EEPROM, PDSO8
Categorystorage   
File Size338KB,26 Pages
ManufacturerMicrochip
Websitehttps://www.microchip.com
Download Datasheet Parametric Compare View All

24LC21AT Overview

128 X 8 I2C/2-WIRE SERIAL EEPROM, PDSO8

24LC21AT Parametric

Parameter NameAttribute value
Number of functions1
Number of terminals8
Maximum operating temperature85 Cel
Minimum operating temperature-40 Cel
Maximum supply/operating voltage5.5 V
Minimum supply/operating voltage2.5 V
Rated supply voltage3 V
maximum clock frequency0.4000 MHz
Processing package description3.90 MM, ROHS COMPLIANT, PLASTIC, SOIC-8
Lead-freeYes
EU RoHS regulationsYes
China RoHS regulationsYes
stateACTIVE
CraftsmanshipCMOS
packaging shapeRECTANGULAR
Package SizeSMALL OUTLINE
surface mountYes
Terminal formGULL WING
Terminal spacing1.27 mm
terminal coatingMATTE TIN
Terminal locationDUAL
Packaging MaterialsPLASTIC/EPOXY
Temperature levelINDUSTRIAL
memory width8
organize128 X 8
storage density1024 deg
operating modeSYNCHRONOUS
Number of digits128 words
Number of digits128
Memory IC typeI2C/2-WIRE SERIAL EEPROM
serial parallelSERIAL
Maximum TWC of write cycle10 ms
24LC21A
1K 2.5V Dual Mode I
2
C
Serial EEPROM
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, I
2
C™ 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
- Industrial (I):
-40°C to +85°C
• Pb-Free and RoHS Compliant
Package Types
PDIP
NC
NC
NC
V
SS
SOIC
NC
NC
NC
Vss
1
24LC21A
2
3
4
8
7
6
5
Vcc
VCLK
SCL
SDA
1
24LC21A
2
3
4
8
7
6
5
Vcc
VCLK
SCL
SDA
Block Diagram
HV Generator
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 informa-
tion. 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 I
2
C 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.
I/O
Control
Logic
Memory
Control
Logic
XDEC
EEPROM
Array
Page Latches
SDA
SCL
YDEC
VCLK
Sense AMP
R/W Control
V
CC
V
SS
Pin Function Table
Name
V
SS
SDA
SCL
VCLK
V
CC
NC
Function
Ground
Serial Address/Data I/O
Serial Clock (Bidirectional mode)
Serial Clock (Transmit-Only mode)
+2.5V to 5.5V Power Supply
No Connection
DDC is a trademark of the Video Electronics Standards
Association.
I
2
C is a trademark of Philips Corporation.
©
2008 Microchip Technology Inc.
DS21160G-page 1

24LC21AT Related Products

24LC21AT 24LC21AT-I/SN 24LC21A_08 24LC21AT-I/P 24LC21A 24LC21A-I/P
Description 128 X 8 I2C/2-WIRE SERIAL EEPROM, PDSO8 128 X 8 I2C/2-WIRE SERIAL EEPROM, PDSO8 128 X 8 I2C/2-WIRE SERIAL EEPROM, PDSO8 128 X 8 I2C/2-WIRE SERIAL EEPROM, PDSO8 128 X 8 I2C/2-WIRE SERIAL EEPROM, PDSO8 128 X 8 I2C/2-WIRE SERIAL EEPROM, PDSO8
Number of functions 1 1 1 1 1 1
Number of terminals 8 8 8 8 8 8
Maximum operating temperature 85 Cel 85 °C 85 Cel 85 Cel 85 Cel 85 °C
Minimum operating temperature -40 Cel -40 °C -40 Cel -40 Cel -40 Cel -40 °C
surface mount Yes YES Yes Yes Yes NO
Terminal form GULL WING GULL WING GULL WING GULL WING GULL WING THROUGH-HOLE
Terminal location DUAL DUAL DUAL DUAL DUAL DUAL
Temperature level INDUSTRIAL INDUSTRIAL INDUSTRIAL INDUSTRIAL INDUSTRIAL INDUSTRIAL
memory width 8 8 8 8 8 8
organize 128 X 8 128X8 128 X 8 128 X 8 128 X 8 128X8
Maximum supply/operating voltage 5.5 V - 5.5 V 5.5 V 5.5 V -
Minimum supply/operating voltage 2.5 V - 2.5 V 2.5 V 2.5 V -
Rated supply voltage 3 V - 3 V 3 V 3 V -
maximum clock frequency 0.4000 MHz - 0.4000 MHz 0.4000 MHz 0.4000 MHz -
Processing package description 3.90 MM, ROHS COMPLIANT, PLASTIC, SOIC-8 - 3.90 MM, ROHS COMPLIANT, PLASTIC, SOIC-8 3.90 MM, ROHS COMPLIANT, PLASTIC, SOIC-8 3.90 MM, ROHS COMPLIANT, PLASTIC, SOIC-8 -
Lead-free Yes - Yes Yes Yes -
EU RoHS regulations Yes - Yes Yes Yes -
China RoHS regulations Yes - Yes Yes Yes -
state ACTIVE - ACTIVE ACTIVE ACTIVE -
Craftsmanship CMOS - CMOS CMOS CMOS -
packaging shape RECTANGULAR - RECTANGULAR RECTANGULAR RECTANGULAR -
Package Size SMALL OUTLINE - SMALL OUTLINE SMALL OUTLINE SMALL OUTLINE -
Terminal spacing 1.27 mm - 1.27 mm 1.27 mm 1.27 mm -
terminal coating MATTE TIN - MATTE TIN MATTE TIN MATTE TIN -
Packaging Materials PLASTIC/EPOXY - PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY -
storage density 1024 deg - 1024 deg 1024 deg 1024 deg -
operating mode SYNCHRONOUS - SYNCHRONOUS SYNCHRONOUS SYNCHRONOUS -
Number of digits 128 - 128 128 128 -
Memory IC type I2C/2-WIRE SERIAL EEPROM - I2C/2-WIRE SERIAL EEPROM I2C/2-WIRE SERIAL EEPROM I2C/2-WIRE SERIAL EEPROM -
serial parallel SERIAL - SERIAL SERIAL SERIAL -
Maximum TWC of write cycle 10 ms - 10 ms 10 ms 10 ms -
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