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AT34C02 Datasheet(PDF) 2 Page - ATMEL Corporation

Part No. AT34C02
Description  2-Wire Serial EEPROM with Permanent Software Write Protect
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Maker  ATMEL [ATMEL Corporation]
Homepage  http://www.atmel.com
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AT34C02
2
Block Diagram
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
for the AT34C02. As many as eight 2K devices may be
addressed on a single bus system (device addressing is
discussed in detail under the Device Addressing section).
WRITE PROTECT (WP): The AT34C02 has a Write Pro-
tect pin that provides hardware data protection. The Write
Protect pin allows normal read/write operations when con-
Absolute Maximum Ratings*
Operating Temperature .................................. -55°C to +125 °C
*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.
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
DOUT/ACK
LOGIC
DOUT
DIN
A0
SDA
GND
A1
SCL
VCC
A2
Y DEC
DATA WORD
ADDR/COUNTER
SERIAL
CONTROL
LOGIC
START
STOP
LOGIC
DEVICE
ADDRESS
COMPARATOR
SERIAL MUX
E2PROM
EN
COMP
INC
LOAD
LOAD
R/W
H.V. PUMP/TIMING
DATA RECOVERY
WP
WRITE PROTECT
CIRCUITRY
SOFTWARE WRITE
PROTECTED AREA
(00H - 7FH)




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