AK93C85A_04 Datasheet, PDF (2/13 Pages) Asahi Kasei Microsystems – 16K / 32K / 64Kbit Serial CMOS EEPROM

ASAHI KASEI
[AK93C85A/95A/10A]
General Description
The AK93C85A/95A/10A is a 16384/32768/65536-bit serial CMOS EEPROM divided into
1024/2048/4096 registers of 16 bits each. The AK93C85A/95A/10A has 4 instructions such as
READ, WRITE, EWEN and EWDS. Those instructions control the AK93C85A/95A/10A.
The AK93C85A/95A/10A 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 AK93C85A/95A/10A, 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. AK93C85A/95A/10A 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,
AK93C85A/95A/10A 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 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.
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
AK93C85AM
AK93C95AF
AK93C10AF
Memory size
16K bits
32K bits
64K bits
Temp. Range
-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
Package
8pin Plastic SSOP
8pin Plastic SOP
8pin Plastic SOP
DAM02E-03
-2-
2004/05