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Atmel Electronic Components Datasheet



AT24C21

2-Wire Serial EEPROM


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AT24C21 pdf
Features
2-wire Serial Interface
Schmitt Trigger, Filtered Inputs For Noise Suppression
DDC1™/ DDC2™ Interface Compliant for Monitor Identification
Low-voltage Operation
– 2.5 (VCC = 2.5V to 5.5V)
Internally Organized 128 x 8
100 kHz (2.5V) Compatibility
8-byte Page Write Mode
Write Protection Available
Self-timed Write Cycle (10 ms max)
High Reliability
– Endurance: 1 Million Write Cycles
– Data Retention: 100 Years
8-lead PDIP and 8-lead JEDEC SOIC Packages
Description
The AT24C21 provides 1024 bits of serial electrically erasable and programmable
read only memory (EEPROM) organized as 128 words of 8 bits each. The device is
optimized for use in applications requiring data storage and serial transmission of con-
figuration and control information. The AT24C21 features two modes of operation:
Transmit-only Mode and Bidirectional Mode. Upon power-up, the AT24C21 will be in
the Transmit-only Mode, sending a serial-bit stream of the entire memory contents,
clocked via the VCLK pin. The Bidirectional Mode is selected by a valid high-to-low
transition on the SCL pin and offers byte selectable read/write capability of the entire
memory array. The AT24C21 is available in space saving 8-lead PDIP and 8-lead
JEDEC SOIC packages.
2-wire Serial
EEPROM
1K (128 x 8)
AT24C21
Not Recommended
for New Designs
Pin Configurations
Pin Name Function
NC No Connect
SDA
SCL
VCLK
Serial Data
Serial Clock Input
(Bidirectional Mode)
Serial Clock Input
(Transmit-only Mode)
8-lead PDIP
NC
NC
NC
GNE
1
2
3
4
8 VCC
7 VCLK
6 SCL
5 SDA
2-Wire, 1K
Serial EEPROM
8-lead SOIC
NC
NC
NC
GND
1
2
3
4
8 VCC
7 VCLK
6 SCL
5 SDA
Rev. 0405I–SEEPR–7/03
1



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AT24C21 pdf
Absolute Maximum Ratings*
Operating Temperature ................................. -55°C to +125°C
Storage Temperature .................................... -65°C to +150°C
Voltage on Any Pin
with Respect to Ground .....................................-1.0V to +7.0V
Maximum Operating Voltage .......................................... 6.25V
DC Output Current........................................................ 5.0 mA
Block Diagram
*NOTICE:
Stresses beyond those listed under “Absolute
Maximum Ratings” may cause permanent dam-
age to the device. This is a stress rating only and
functional operation of the device at these or any
other conditions beyond those indicated in the
operational sections of this specification is not
implied. Exposure to absolute maximum rating
conditions for extended periods may affect device
reliability.
2 AT24C21
0405I–SEEPR–7/03



Part Number AT24C21
Description 2-Wire Serial EEPROM
Maker ATMEL Corporation - ATMEL Corporation
Total Page 17 Pages
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