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Atmel Electronic Components Datasheet

AT24C21 Datasheet

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



Atmel Electronic Components Datasheet

AT24C21 Datasheet

2-Wire Serial EEPROM

No Preview Available !

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



Atmel Electronic Components Datasheet

AT24C21 Datasheet

2-Wire Serial EEPROM

No Preview Available !

AT24C21 pdf
AT24C21
Pin Description
SERIAL CLOCK (SCL): The SCL input is used to positive edge clock data into each
EEPROM device and negative edge clock data out of each device.
SERIAL DATA (SDA): The SDA pin is bidirectional for serial data transfer. This pin is
open-drain driven and may be wire-ORed with any number of other open drain or open
collector devices.
SERIAL CLOCK (VCLK): Upon power-up, the device is in the Transmit-only mode and
will transmit the entire memory contents via the SDA pin with positive signals on the
VCLK pin.
Memory Organization AT24C21, 1K SERIAL EEPROM: Internally organized with 128 pages of one byte each.
The 1K requires a 7-bit data word address for random word addressing.
DC Characteristics
Applicable over recommended operating range from: TAI = -40°C to +85°C, TAC = 0°C to +70°C, VCC = +2.5V to +5.5V
(unless otherwise noted).
Symbol Parameter
Test Condition
Min Typ Max Units
VCC Supply Voltage
2.5 5.5 V
ICC Supply Current VCC = 5.0V
READ at 100 KHz
0.4 1.0 mA
ICC Supply Current VCC = 5.0V
WRITE at 100 KHz
2.0 3.0 mA
ISB
Standby Current
VCC = 2.5V
VIN = VCC or VSS
VCC = 5.0V
VIN = VCC or VSS
3.0
12.0
4.0
30.0
µA
µA
ILI Input Leakage Current
VIN = VCC or VSS
0.10 1.0
µA
ILO Output Leakage Current
VOUT = VCC or VSS
VIL Input Low Level(1) SCL, SDA Pin
Input Low Level VCLK Pin
VCC 2.7V
VCC < 2.7V
VIH Input High Level(1) SCL, SDA Pin
Input High Level VCLK Pin
-0.6
VCC × 0.7
2.0
0.05
1.0
VCC × 0.3
0.8
0.2 × VCC
VCC + 0.5
µA
V
V
V
V
V
VOL
Note:
Output Low Level VCC = 3.0V
IOL = 2.1 mA
1. VIL min and VIH max are for reference only and not tested.
0.40 V
Pin Capacitance(1)
Applicable over recommended operating range from TA = 25°C, f = 1.0 MHz, VCC = +1.8V.
Symbol Test Condition
Max
CI/O
CIN
Note:
Input/Output Capacitance (SDA)
Input Capacitance (A0, A1, A2, SCL, VCLK)
1. This parameter is characterized and is not 100% tested.
8
6
Units
pF
pF
Conditions
VI/O = 0V
VIN = 0V
0405I–SEEPR–7/03
3




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