A93C66
AiT Semiconductor Inc.
www.ait-ic.com
THREE-WIRE SERIAL EEPROM
4K (512 X 8 OR 256 X 16)
ERASE (ERASE)
The Erase (ERASE) instruction programs all bits in the specified memory location to the logical “1”state. The
self-timed erase cycle starts once the ERASE instruction and address are decoded. The DO pin outputs the
Ready/Busy status of the part if CS is brought high after being kept low for a minimum of 250ns (TCS). A logic
“1” at pin DO indicates that the selected memory location has been erased, and the part is ready for another
instruction.
WRITE (WRITE)
The Write (WRITE) instruction contains the 8 or 16 bits of data to be written into the specified memory location.
The self-timed programming cycle, tWP, starts after the last bit of data is received at serial data input pin DI.
The DO pin outputs the Ready/Busy status of the part if CS is brought high after being kept low for a minimum
of 250ns (TCS). A logic “0” at DO indicates that programming is still in progress. A logic “1” indicates that the
memory location at the specified address has been written with the data pattern contained in the instruction
and the part is ready for further instructions. A Ready/Busy status cannot be obtained if the CS is brought high
after the end of the self timed programming cycle, TWP.
ERASE ALL (ERAL)
The Erase All (ERAL) instruction programs every bit in the memory array to the logic “1” state and is primarily
used for testing purposes. The DO pin outputs the Ready/Busy status of the part if CS is brought high after
being kept low for a minimum of 250ns (TCS). The ERAL instruction is valid only at VCC = 5.0V ± 10%.
WRITE ALL (WRAL)
The Write All (WRAL) instruction programs all memory locations with the data patterns specified in the
instruction. The DO pin outputs the Ready/Busy status of the part if CS is brought high after being kept low for
a minimum of 250ns (TCS). The WRAL instruction is valid only at VCC = 5.0V ± 10%.
ERASE/WRITE DISABLE (EWDS)
To protect against accidental data disturb, the Erase/Write Disable (EWDS) instruction disables all
programming modes and should be executed after all programming operations. The operation of the Read
instruction is independent of both the EWEN and EWDS instructions and can be executed at any time.
REV1.0
- MAY 2012 RELEASED -
- 8 -
AITSEMI [ AiT Semiconductor ]
