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
2-Wire
Serial EEPROM
32K (4096 x 8)
64K (8192 x 8)
– 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
AT24C32
AT24C64
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.
8-Pin PDIP
Pin Configurations
A0
A1
1
2
3
4
8
7
6
5
VCC
WP
Pin Name
A0 to A2
SDA
Function
2-Wire, 32K
Address Inputs
Serial Data
A2
SCL
SDA
Serial E2PROM
GND
SCL
Serial Clock Input
Write Protect
8-Pin TSSOP
WP
A0
A1
A2
1
2
3
4
8
7
6
5
VCC
WP
SCL
SDA
14-Pin SOIC
GND
NC
A0
1
14
13
NC
2
VCC
WP
NC
8-Pin SOIC
A1
3
4
5
6
7
12
11
10
9
NC
A2
A0
A1
1
2
3
4
8
7
6
5
VCC
WP
SCL
SDA
NC
GND
NC
A2
SCL
SDA
8
GND
Rev. 0336F–08/98
1
ATMEL [ ATMEL ]
