Rainbow Electronics AT24C64 User Manual
Wire serial eeprom, Wire, 32k serial e, Prom

1
Features
•
Low-Voltage and Standard-Voltage Operation
– 2.7 (V
CC
= 2.7V to 5.5V)
– 1.8 (V
CC
= 1.8V to 5.5V)
•
Low-Power Devices (I
SB
= 2
µA at 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) Clock Rate
•
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
•
Automotive Grade and Extended Temperature Devices Available
•
8-Pin JEDEC PDIP, 8-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 JEDEC SOIC, 8-pin EIAJ SOIC,
and 8-pin TSSOP (AT24C64) 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.
2-Wire
Serial EEPROM
32K (4096 x 8)
64K (8192 x 8)
AT24C32
AT24C64
Rev. 0336I–SEEPR–07/02
2-Wire, 32K
Serial E
2
PROM
Pin Configurations
Pin Name
Function
A0 - A2
Address Inputs
SDA
Serial Data
SCL
Serial Clock Input
WP
Write Protect
8-Pin PDIP
1
2
3
4
8
7
6
5
A0
A1
A2
GND
VCC
WP
SCL
SDA
8-Pin SOIC
1
2
3
4
8
7
6
5
A0
A1
A2
GND
VCC
WP
SCL
SDA
8-Pin TSSOP
1
2
3
4
8
7
6
5
A0
A1
A2
GND
VCC
WP
SCL
SDA
Document Outline
- Pin Configurations
- Features
- Description
- Absolute Maximum Ratings*
- Block Diagram
- Pin Description
- Memory Organization
- Pin Capacitance(1)
- DC Characteristics
- AC Characteristics
- Device Operation
- Bus Timing SCL: Serial Clock, SDA: Serial Data I/O
- Write Cycle Timing SCL: Serial Clock, SDA: Serial Data I/O
- Data Validity
- Start and Stop Definition
- Output Acknowledge
- Device Addressing
- Write Operations
- Read Operations
- AT24C32 Ordering Information
- AT24C64 Ordering Information
- Packaging Information