AK6416C Datasheet, PDF (2/14 Pages) Asahi Kasei Microsystems – 16Kbit Serial CMOS EEPROM

ASAHI KASEI
[AK6416C]
General Description
The AK6416C is a 16384bit, serial, read/write, non-volatile memory device fabricated using an
advanced CMOS EEPROM technology. The AK6416C has 16384bits of memory organized into
1024 registers of 16 bits each. The AK6416C 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.
The AK6416C can connect to the serial communication port of popular one chip microcomputer
directly (3 line negative clock synchronous interface). At write operation, AK6416C 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, AK6416C takes out the read data from a register to
data output pin (DO) synchronously with falling edge of SK .
The AK6416C has 5 instructions such as READ, WRITE, PAGE WRITE, WREN (write enable) and
WRDS (write disable). Each instruction is organized by op-code block (8bits), address block (8bits)
and data (8bits x 2). When input level of SK pin is high level and input level of chip select
( CS ) pin is changed from high level to low level, AK6416C can receive the instructions.
Special features of the AK6416C include : automatic write time-out with auto-ERASE,
Ready/ Busy status signal output and ultra-low standby power mode when deselected
( CS =high).
Software and Hardware controlled write protection
The AK6416C has 2 (hardware and software) write protection functions.
After power on or after execution of WRDS (write disable) instruction, execution of WRITE
instruction will be disabled. This write protection condition continues until WREN instruction is
executed or VCC is removed from the part.
Execution of READ instruction is independent of both WREN and WRDS instructions.
Reset pin should be low level when WRITE instruction is executed. When the Reset pin is high
level, the WRITE instruction is not executed.
Ready/ Busy status signal
During the automatic write time-out period ( Busy status), the AK6416C can't accept the other
instructions. The AK6416C has 2 functions to know the Busy status from exterior.
The RDY/ BUSY pin indicates the Busy status regardless of the CS pin status. The
RDY/ BUSY pin outputs the low level regardless of the CS pin status during Busy status.
Except the above status, this pin outputs high level.
Also the DO pin indicates the Busy status. When input level of SK pin is low level and input
level of CS pin is changed from high level to low level, the AK6416C is in the status output
mode and the DO pin indicates the Ready/ Busy status. The Ready/ Busy status outputs on
DO pin until CS pin is changed from low level to high level, or first bit ("1") of op-code of next
instruction is given to the part. Except when the device is in the status output mode or outputs
data, the DO pin is in the high impedance state.
Type of Products
Model
AK6416CM
AK6416CH
Temp.Range
-40°C to 85°C
-40°C to 85°C
VCC
1.8V to 5.5V
1.8V to 5.5V
Package
8pin Plastic SSOP
8pin Plastic MSOP
DAS05E-00
-2-
2005/03