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ATMEL Corporation
ATMEL Corporation

AT24C32 Datasheet

2-Wire Serial EEPROM


AT24C32 Datasheet Preview


Features
Low-Voltage and Standard-Voltage Operation
– 5.0 (VCC = 4.5V to 5.5V)
– 2.7 (VCC = 2.7V to 5.5V)
– 2.5 (VCC = 2.5V to 5.5V)
– 1.8 (VCC = 1.8V to 5.5V)
Low-Power Devices (ISB = 2 µA @ 5.5V) Available
Internally Organized 4096 x 8, 8192 x 8
2-Wire Serial Interface
Schmitt Trigger, Filtered Inputs for Noise Suppression
Bidirectional Data Transfer Protocol
100 kHz (1.8V, 2.5V, 2.7V) and 400 kHz (5V) Compatibility
Write Protect Pin for Hardware Data Protection
32-Byte Page Write Mode (Partial Page Writes Allowed)
Self-Timed Write Cycle (10 ms max)
High Reliability
– Endurance: 1 Million Write Cycles
– Data Retention: 100 Years
– ESD Protection: >3,000V
Automotive Grade and Extended Temperature Devices Available
8-Pin JEDEC PDIP, 8-Pin and 14-Pin JEDEC SOIC, 8-Pin EIAJ SOIC,
and 8-pin TSSOP Packages
Description
The AT24C32/64 provides 32,768/65,536 bits of serial electrically erasable and pro-
grammable read only memory (EEPROM) organized as 4096/8192 words of 8 bits
each. The device’s cascadable feature allows up to 8 devices to share a common 2-
wire bus. The device is optimized for use in many industrial and commercial applica-
tions where low power and low voltage operation are essential. The AT24C32/64 is
available in space saving 8-pin JEDEC PDIP, 8-pin and 14-pin JEDEC SOIC, 8-pin
EIAJ SOIC, and 8-pin TSSOP packages and is accessed via a 2-wire serial interface.
In addition, the entire family is available in 5.0V (4.5V to 5.5V), 2.7V (2.7V to 5.5V),
2.5V (2.5V to 5.5V) and 1.8V (1.8V to 5.5V) versions.
Pin Configurations
Pin Name
A0 to A2
SDA
Function
Address Inputs
Serial Data
8-Pin PDIP
A0
A1
A2
GND
1
2
3
4
8 VCC
7 WP
6 SCL
5 SDA
SCL Serial Clock Input
WP Write Protect
14-Pin SOIC
8-Pin TSSOP
A0
A1
A2
GND
1
2
3
4
8 VCC
7 WP
6 SCL
5 SDA
NC
A0
A1
NC
A2
GND
NC
1
2
3
4
5
6
7
14 NC
13 VCC
12 WP
11 NC
10 SCL
9 SDA
8 NC
8-Pin SOIC
A0
A1
A2
GND
1
2
3
4
8 VCC
7 WP
6 SCL
5 SDA
2-Wire
Serial EEPROM
32K (4096 x 8)
64K (8192 x 8)
AT24C32
AT24C64
2-Wire, 32K
Serial E2PROM
Rev. 0336F–08/98
1
Page 1

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.
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.
DEVICE/PAGE ADDRESSES (A2, A1, A0): The A2, A1
and A0 pins are device address inputs that are hard wired
or left not connected for hardware compatibility with
AT24C16. When the pins are hardwired, as many as eight
32K/64K devices may be addressed on a single bus sys-
tem (device addressing is discussed in detail under the
Device Addressing section). When the pins are not hard-
wired, the default A2, A1, and A0 are zero.
WRITE PROTECT (WP): The write protect input, when tied
to GND, allows normal write operations. When WP is tied
high to VCC, all write operations to the upper quandrant
(8/16K bits) of memory are inhibited. If left unconnected,
WP is internally pulled down to GND.
Memory Organization
AT24C32/64, 32K/64K SERIAL EEPROM: The 32K/64K is
internally organized as 256 pages of 32 bytes each. Ran-
dom word addressing requires a 12/13 bit data word
address.
2 AT24C32/64
Page 2

AT24C32/64
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)
1. This parameter is characterized and is not 100% tested.
8
6
Units
pF
pF
Conditions
VI/O = 0V
VIN = 0V
DC Characteristics
Applicable over recommended operating range from: TAI = -40°C to +85°C, VCC = +1.8V to +5.5V, TAC = 0°C to +70°C,
VCC = +1.8V to +5.5V (unless otherwise noted).
Symbol Parameter
Test Condition
Min Typ Max Units
VCC1
Supply Voltage
1.8 5.5 V
VCC2
Supply Voltage
2.5 5.5 V
VCC3
Supply Voltage
2.7 5.5 V
VCC4
Supply Voltage
4.5 5.5 V
ICC1 Supply Current VCC = 5.0V
READ at 100 kHz
0.4 1.0 mA
ICC2 Supply Current VCC = 5.0V
WRITE at 100 kHz
2.0 3.0 mA
ISB1
Standby Current
(1.8V option)
VCC = 1.8V
VCC = 5.5V
VIN = VCC or VSS
0.1 µA
2.0
ISB2
Standby Current
(2.5V option)
VCC = 2.5V
VCC = 5.5V
VIN = VCC or VSS
0.5 µA
2.0
ISB3
Standby Current
(2.7V option)
VCC = 2.7V
VCC = 5.5V
VIN = VCC or VSS
0.5 µA
2.0
ISB4
Standby Current
(5V option)
VCC = 4.5 - 5.5V VIN = VCC or VSS
20 35 µA
ILI
ILO
VIL
VIH
VOL2
VOL1
Notes:
Input Leakage Current
Output Leakage Current
Input Low Level(1)
VIN = VCC or VSS
VOUT = VCC or VSS
Input High Level(1)
Output Low Level VCC = 3.0V
IOL = 2.1 mA
Output Low Level VCC = 1.8V
IOL = 0.15 mA
1. VIL min and VIH max are reference only and are not tested.
-0.6
VCC x 0.7
0.10
0.05
3.0
3.0
VCC x 0.3
VCC + 0.5
0.4
0.2
µA
µA
V
V
V
V
3
Page 3
Part Number AT24C32
Manufactur ATMEL Corporation
Description 2-Wire Serial EEPROM
Total Page 15 Pages
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