AT24C512 查看數據表（PDF） - Atmel Corporation

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AT24C512

2-wire Serial EEPROM 512K (65,536 x 8)

Atmel Corporation 

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 (A1, A0): The A1 and A0

pins are device address inputs that are hardwired or left not

connected for hardware compatibility with AT24C128/256.

When the pins are hardwired, as many as four 512K

devices may be addressed on a single bus system (device

addressing is discussed in detail under the Device

Addressing section). When the pins are not hardwired, the

default 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 memory are inhib-

ited. If left unconnected, WP is internally pulled down to

GND. Switching WP to VCC prior to a write operation cre-

ates a software write protect function.

Memory Organization

AT24C512, 512K SERIAL EEPROM: The 512K is inter-

nally organized as 512 pages of 128-bytes each. Random

word addressing requires a 16-bit data word address.

2

AT24C512

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