AT34C02 データシートの表示（PDF） - Atmel Corporation
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AT34C02 Datasheet PDF : 12 Pages
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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
*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.
Block Diagram
VCC
GND
WP
SCL
SDA
A2
A1
A0
START
STOP
LOGIC
LOAD
DEVICE
ADDRESS
COMPARATOR
R/W
SERIAL
CONTROL
LOGIC
EN
WRITE PROTECT
CIRCUITRY
COMP
LOAD INC
DATA WORD
ADDR/COUNTER
H.V. PUMP/TIMING
DATA RECOVERY
SOFTWARE WRITE
PROTECTED AREA
(00H - 7FH)
E2PROM
Y DEC
SERIAL MUX
DIN
DOUT
DOUT/ACK
LOGIC
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-
2
AT34C02
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