Features
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Low-Voltage and Standard-Voltage Operation
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– 2.7 (V
CC
= 2.7V to 5.5V)
– 1.8 (V
CC
= 1.8V to 5.5V)
Low-Power Devices (I
SB
= 6 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) and 400 kHz (2.5V) Clock Rate for AT24C32A
400 kHz (1.8V) Clock Rate for AT24C64A
Write Protect Pin for Hardware Data Protection
32-Byte Page Write Mode (Partial Page Writes Allowed)
Self-Timed Write Cycle (5 ms Max)
High Reliability
– Endurance: 1 Million Write Cycles
– Data Retention: 100 Years
Automotive Grade, Extended Temperature and Lead-free/Halogen-free
Devices Available
8-lead JEDEC PDIP, 8-lead JEDEC SOIC, 8-lead EIAJ SOIC, 8-lead MAP and 8-lead
TSSOP Packages
2-Wire
Serial EEPROM
32K (4096 x 8)
64K (8192 x 8)
AT24C32A
AT24C64A
Description
The AT24C32A/64A provides 32,768/65,536 bits of serial electrically erasable and
programmable 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 AT24C32A/64A is
available in space saving 8-lead JEDEC PDIP, 8-lead JEDEC SOIC, 8-lead EIAJ
SOIC, 8-lead MAP and 8-lead TSSOP packages and is accessed via a 2-wire serial
interface. In addition, the entire family is available in 2.7V (2.7V to 5.5V) and 1.8V
(1.8V to 5.5V) versions.
Pin Configurations
Pin Name
A0 - A2
SDA
SCL
WP
Function
Address Inputs
Serial Data
Serial Clock Input
Write Protect
Bottom View
A0
A1
A2
GND
8-lead SOIC
1
2
3
4
8
7
6
5
VCC
WP
SCL
SDA
8-lead MAP
VCC
WP
SCL
SDA
8
7
6
5
1
2
3
4
A0
A1
A2
GND
8-lead TSSOP
A0
A1
A2
GND
1
2
3
4
8
7
6
5
VCC
WP
SCL
SDA
A0
A1
A2
GND
8-lead PDIP
1
2
3
4
8
7
6
5
VCC
WP
SCL
SDA
3054N–SEEPR–2/04
1
ATMEL [ ATMEL CORPORATION ]
