AK93C45B_03 Datasheet, PDF (2/14 Pages) Asahi Kasei Microsystems – 1K / 2K / 4K / 8Kbit Serial CMOS EEPROM

ASAHI KASEI
[AK93C45B/55B/65B/75B]
General Description
The AK93C45B/55B/65B/75B is a 1024/2048/4096/8192-bit serial CMOS EEPROM divided into
64/128/256/512 registers of 16 bits each. The AK93C45B/55B/65B/75B has 4 instructions such as
READ, WRITE, EWEN and EWDS. Those instructions control the AK93C45B/55B/65B/75B.
The AK93C45B/55B/65B/75B can operate full function under wide operating voltage range from
1.8V to 5.5V. The charge up circuit is integrated for high voltage generation that is used for write
operation.
A serial interface of AK93C45B/55B/65B/75B, consisting of chip select (CS), serial clock (SK),
data-in (DI) and data-out (DO), can easily be controlled by popular microcontrollers or standard
microprocessors. AK93C45B/55B/65B/75B takes in the write data from data input pin (DI) to a
register synchronously with rising edge of input pulse of serial clock pin (SK). And at read
operation, AK93C45B/55B/65B/75B takes out the read data from a register to data output pin (DO)
synchronously with rising edge of SK.
The DO pin is usually in high impedance state. The DO pin outputs "L" or "H" in case of data
output or Busy/Ready signal output.
x Software and Hardware controlled write protection
When VCC is applied to the part, the part automatically powers up in the ERASE/WRITE Disable
state. In the ERASE/WRITE disable state, execution of WRITE instruction is disabled. Before
WRITE instruction is executed, EWEN instruction must be executed. The ERASE/WRITE enable
state continues until EWDS instruction is executed or VCC is removed from the part.
Execution of a read instruction is independent of both EWEN and EWDS instructions.
The PE is internally pulled up to VCC. If the PE is left unconnected, the part will accept WRITE,
EWEN and EWDS instructions. ・・AK93C55B/65B/75B
x Busy/Ready status signal
After a write instruction, the DO output serves as a Busy/Ready status indicator. After the falling
edge of the CS initiates the self-timed programming cycle, the DO indicates the Busy/Ready status
of the chip if the CS is brought high after a minimum of 250ns (Tcs). DO=logical "0" indicates that
programming is still in progress. DO=logical "1" indicates that the register at the address specified
in the instruction has been written with the new data pattern contained in the instruction and the part
is ready for a next instruction.
The Busy/Ready status indicator is only valid when CS is active (high). When CS is low, the DO
output goes into a high impedance state.
The Busy/Ready signal outputs until a start bit (Logic"1") of the next instruction is given to the part.
„ Type of Products
Model
AK93C45BH
AK93C45BL
AK93C55BH
AK93C55BL
AK93C65BH
AK93C65BL
AK93C75BH
Memory size
1K bits
2K bits
4K bits
8K bits
Temp. Range
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
VCC
1.8V to 5.5V
1.8V to 5.5V
1.8V to 5.5V
1.8V to 5.5V
1.8V to 5.5V
1.8V to 5.5V
1.8V to 5.5V
Package
8pin Plastic MSOP
8pin Plastic SON
8pin Plastic MSOP
8pin Plastic SON
8pin Plastic MSOP
8pin Plastic SON
8pin Plastic MSOP
DAM04E-02
-2-
2003/05