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Features
? Permanent and reversible software write protection for the first-half of the array
– Software procedure to verify write protect status
? Hardware write protection for the entire array
? Low-voltage and standard-voltage operation
– 1.7 (V CC = 1.7V to 5.5V)
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?
Internally organized 256 x 8
Two-wire serial interface
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Schmitt trigger, filtered inputs for noise suppression
Bidirectional data transfer protocol
100kHz (1.7V) and 400kHz (2.7V and 5.0V) compatibility
16-byte page write modes
Partial page writes are allowed
Self-timed write cycle (5ms max)
High-reliability
– Endurance: 1 million write cycles
– Data retention: 100 years
8-lead JEDEC SOIC, 8-lead Ultra Thin Mini-MAP (MLP 2x3), 8-lead TSSOP, and 8-ball
dBGA2 packages
Die sales: wafer form, tape and reel, and bumped wafers
Two-wire Serial
Electrically-erasable
and Programmable
Read Only Memory
with Permanent
and Reversible
Software Write
Protect
2K (256 x 8)
Description
The Atmel ? AT34C02C provides 2048 bits of serial electrically-erasable and programmable
read only memory (EEPROM) organized as 256 words of eight bits each. The first-half of
the device incorporates a permanent and a reversible software write protection feature
while hardware write protection for the entire array is available via an external pin. Once the
permanent software write protection is enabled, by sending a special command to the
device, it cannot be reversed. However, the reversible software write protection is enabled
and can be reversed by sending a special command. The hardware write protection is con-
trolled with the WP pin and can be used to protect the entire array, whether or not the
software write protection has been enabled. This allows the user to protect none, first-half,
or all of the array depending on the application. The device is optimized for use in many
industrial and commercial applications where low-power and low-voltage operations are
essential. The AT34C02C is available in space saving 8-lead JEDEC SOIC, 8-lead Ultra Thin
Mini-MAP (MLP 2x3) , 8-lead TSSOP, and 8-ball dBGA2 packages and is accessed via a Two-
wire serial interface. It is available in 1.7V (1.7V to 5.5V).
Atmel AT34C02C
Not Recommended for
New Design
Replaced by AT34C02D
8-lead TSSOP
8-ball dBGA2
8-lead Ultra Thin Mini-MAP
A
A
A
N
CC
SC
SA
VCC
WP
SCL
SDA
8
7
6
5
1
2
3
4
A0
A1
A2
GND
CC
SC
SA
A
A
A
N
A
A
A
8-lead SOIC
CC
SC
Bottom View
(MLP 2x3) Bottom View
N
SA
5185E–SEEPR–3/11
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