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AK6416AM

16Kbit Serial CMOS EEPROM

Asahi Kasei Microdevices 

ASAHI KASEI

[AK6416A]

General Description

The AK6416A is a 16384bit, serial, read/write, non-volatile memory device fabricated using an advanced

CMOS EEPROM technology. The AK6416A has 16384bits of memory organized into 1024 registers of 16 bits

each. The AK6416A 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 AK6416A can connect to the serial communication port of popular one chip microcomputer directly (3 line

negative clock synchronous interface). At write operation, AK6416A 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,

AK6416A takes out the read data from a register to data output pin (DO) synchronously with falling edge of

SK.

The AK6416A has 4 instructions such as READ, WRITE, WREN (write enable) and WRDS (write disable).

Each instruction is organized by op-code block (8bits), address block (8bits) and data (8bits Õ 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,

AK6416A can receive the instructions.

Special features of the AK6416A 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 AK6416A 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 AK6416A can't accept the other instructions.

The AK6416A 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 AK6416A 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

AK6416AM

Memory size

16Kbits

Temp.Range

-40°C∼85°C

Vcc

1.8V∼5.5V

Package

8pin Plastic SSOP

DAS02E-00

-2-

1999/05

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