AT25128B/AT25256B
Description
3.
Description
The AT25128B/AT25256B provides 131,072/262,144 bits of Serial Electrically Erasable and
Programmable Read-Only Memory (EEPROM) organized as 16,384/32,768 words of 8 bits each.
The device is optimized for use in many industrial and commercial applications where low‑power and
low‑voltage operation are essential. The device is available in space-saving 8‑lead SOIC, 8‑lead TSSOP,
8‑pad UDFN and 8‑ball VFBGA packages. All packages operate from 1.8V to 5.5V.
3.1
SPI Bus Master Connections to Serial EEPROMs
SPI Master:
Microcontroller
Data Clock (SCK)
Data Output (SO)
Data Input (SI)
SI SO SCK
SI SO SCK
SI SO SCK
SI SO SCK
Slave 0
Slave 1
Slave 2
Slave 3
AT25XXX
AT25XXX
AT25XXX
AT25XXX
CS
CS
CS
CS
CS3 CS2 CS1 CS0
DS20006193A-page 7
© 2019 Microchip Technology Inc.
MICROCHIP [ MICROCHIP ]
