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PDF AK6440B Data sheet ( Hoja de datos )
| Número de pieza | AK6440B | |
| Descripción | CMOS EEPROM | |
| Fabricantes | AKM | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AK6440B (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
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ASAHI KASEI
[AK6440B]
AK6440B
4096bit Serial CMOS EEPROM
Features
ADVANCED CMOS EEPROM TECHNOLOGY
Wide VCC (1.8V ~ 5.5V) operation
4096 bits: 256×16 organization
ONE CHIP MICROCOMPUTER INTERFACE
- Interface with one chip microcomputer's serial communication port directly
LOW POWER CONSUMPTION
- 0.75mA Max. (Read operation)
- 0.8µA Max. (Standby mode)
HIGH RELIABILITY
- Endurance
: 100K cycles
- Data Retention : 10 years
SPECIAL FEATURES
- High speed operation ( fMAX=1MHz: VCC=2.5V )
- Automatic write cycle time-out with auto-ERASE
- Automatic address increment (READ)
- Software and Hardware controlled write protection
IDEAL FOR LOW DENSITY DATA STORAGE
- Low cost, space saving, 8-pin package (MSOP, SON)
DI
INSTRUCTION
REGISTER
CS
SK
INSTRUCTION
DECODE,
CONTROL
AND
CLOCK
GENERATION
DATA
REGISTER
16
R/W AMPS
16
AND
AUTO ERASE
ADD.
BUFFERS
DECODER
DO
EEPROM
4096bit
256 ×16
VPP SW
RESET
VREF
VPP
GENERATOR
DAS03E-01
Block diagram
-1-
2012/09
http://www.Datasheet4U.com
1 page  
ASAHI KASEI
[AK6440B]
Functional Description
The AK6440B 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×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, AK6440B can receive the instructions.
When the instructions are executed consecutively, the CS pin should be brought to high
level for a minimum of 250ns(tCS) between consecutive instruction cycle.
Instruction Set
Instruction
Op-Code
Address
Data
WRITE
10100100
A7 A6 A5 A4 A3 A2 A1 A0 D15-D0(IN)
READ
10101000
A7 A6 A5 A4 A3 A2 A1 A0 D15-D0(OUT)
WREN
10100011
XX X X X X X X
WRDS
10100000
XX X X X X X X
(WRAL)
10101111
X X X X X X X X D15-D0(IN)
X: don’t care
(Note) The WRAL instruction is used for factory function test only. User can't use this
instruction.
Write
The write instruction is followed by 16 bits of data to be written into the specified address.
After the 32nd rising edge of SK to read D0 in, the AK6440B will be put into the automatic
write time-out period. During the automatic write time-out period (Busy status) and while
entering write instruction, the RESET pin should be low level. If the RESET pin is set to
high level during the automatic write time-out period, the AK6440B stops execution of
internal programming and the device returns to ready status. In this case the word data of
the specified address will be incomplete. When inputting the new instruction after RESET,
the CS pin should be set to high level. When the RESET pin is kept at high level, the write is
not executed. This becomes write protection function.
The CS pin need not be high level during automatic write time-out period (BUSY status).
RESET
CS
SK
DI
DO
1 2 3 4 5 6 7 8 9 10
1 0 1 0 0 1 0 0 A7 A6
Hi-Z
15 16 17 18
A1 A0 D15 D14
WRITE
30 31 32
D2 D1 D0
tE/W
DAS03E-01
-5-
2012/09
5 Page 
ASAHI KASEI
CS
SK
DI
DO
[AK6440B]
31 32
D1 D0
Data Output (READ)
tOZ
RESET
CS
SK
DI
DO
30
D2
tCSH
31 32
D1 D0
Hi-Z
Data Input (WRITE)
DAS03E-01
- 11 -
2012/09
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet AK6440B.PDF ] | |
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