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SERVICE MANUAL
applications where low-power and low-voltage operation are essential. The devices are available in space-saving 8-
pin JEDEC PDIP, 8-lead EIAJ, 8-lead JEDEC SOIC, 14-lead TSSOP, and 8-pad LAP packages. In addition, the
entire family is available in 5.0V (4.5V to 5.5V), 2.7V (2.7V to 5.5V) and 1.8V (1.8V to 3.6V) versions.
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-O Red 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 AT24C32/64. When the pins are hardwired, as many as four 128K/256K
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 A
and A
are zero.
1
0
WRITE PROTECT (WP): The write protect input, when tied to GND, allows normal write operations. When WP is
tied high to V
, all write operations to the memory are inhibited. If left unconnected, WP is internally pulled down to
CC
GND. Switching WP to V
prior to a write operation creates a software write protect function.
CC
Memory Organization
AT24C128/256, 128K/256K SERIAL EEPROM: The128K/256K is internally organized as 256/512 pages of 64-
bytes each. Random word addressing requires a 14/15-bit data word address.
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
Rev 1.0 21.10.02 16:23
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