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AT24C21-10SI-2.5

P1-P3P4-P6P7-P9P10-P12P13-P14
1
Features
• 2-wire Serial Interface
• Schmitt Trigger, Filtered Inputs For Noise Suppression
• DDC1™/ DDC2™ Interface Compliant for Monitor Identification
• Low-voltage Operation
– 2.5 (V
CC
= 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
– ESD Protection: >3000V
• 8-pin PDIP and 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-pin PDIP and 8-lead SOIC
packages.
2-wire Serial
EEPROM
1K (128 x 8)
AT24C21
Rev. 0405F–01/00
2-Wire, 1K
Serial EEPROM
Pin Configurations
Pin Name Function
NC No Connect
SDA Serial Data
SCL Serial Clock Input
(Bidirectional Mode)
VCLK Serial Clock Input
(Transmit-only Mode)
8-pin PDIP
1
2
3
4
8
7
6
5
NC
NC
NC
GNE
VCC
VCLK
SCL
SDA
8-lead SOIC
1
2
3
4
8
7
6
5
NC
NC
NC
GND
VCC
VCLK
SCL
SDA
AT24C21
2
Block Diagram
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.
Absolute Maximum Ratings*
Operating Temperature ................................. -55°C to +125°C
*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.
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
AT24C21
3
Note: 1. V
IL
min and V
IH
max are for reference only and not tested.
Note: 1. This parameter is characterized and is not 100% tested.
DC Characteristics
Applicable over recommended operating range from: T
AI
= -40°C to +85°C, T
AC
= 0° C to +70°C, V
CC
= +2.5V to +5.5V
(unless otherwise noted).
Symbol Parameter Test Condition Min Typ Max Units
V
CC
Supply Voltage 2.5 5.5 V
I
CC
Supply Current V
CC
= 5.0V READ at 100 KHz 0.4 1.0 mA
I
CC
Supply Current V
CC
= 5.0V WRITE at 100 KHz 2.0 3.0 mA
I
SB
Standby Current V
CC
= 2.5V
V
CC
= 5.0V
V
IN
= V
CC
or V
SS
V
IN
= V
CC
or V
SS
3.0
12.0
4.0
30.0
µA
µA
I
LI
Input Leakage Current V
IN
= V
CC
or V
SS
0.10 1.0 µA
I
LO
Output Leakage Current V
OUT
= V
CC
or V
SS
0.05 1.0 µA
V
IL
Input Low Level
(1)
SCL, SDA Pin
Input Low Level VCLK Pin V
CC
≥ 2.7V
V
CC
< 2.7V
-0.6 V
CC
× 0.3
0.8
0.2 × V
CC
V
V
V
V
IH
Input High Level
(1)
SCL, SDA Pin
Input High Level VCLK Pin
V
CC
× 0.7
2.0
V
CC
+ 0.5 V
V
V
OL
Output Low Level V
CC
= 3.0V I
OL
= 2.1 mA 0.40 V
Pin Capacitance
(1)
Applicable over recommended operating range from T
A
= 25°C, f = 1.0 MHz, V
CC
= +1.8V.
Symbol Test Condition Max Units Conditions
C
I/O
Input/Output Capacitance (SDA) 8 pF V
I/O
= 0V
C
IN
Input Capacitance (A
0
, A
1
, A
2
, SCL, VCLK) 6 pF V
IN
= 0V
Transmit-only Mode
Symbol Parameter
2.5-volt
UnitsMin Max
T
VAA
Output valid from VCLK 500 ns
T
VHIGH
VCLK high-time 4.0 µs
T
VLOW
VCLK low-time 4.7 µs
T
VHZ
Mode transition time 500 ns
T
VPU
Transmit-only power-up time 0 ns
P1-P3P4-P6P7-P9P10-P12P13-P14

AT24C21-10SI-2.5

Mfr. #:
Buy AT24C21-10SI-2.5
Manufacturer:
Description:
IC EEPROM 1K I2C 100KHZ 8SOIC
Lifecycle:
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