BU9891GUL-W Datasheet, PDF (7/18 Pages) Rohm – WL-CSP EEPROM family Microwire Bus

BU9891GUL-W
●Block diagram
Technical Note
CS
Command decode
Control
SK
Clock generation
DI
Command
register
DO
Dummy bit
●Pin assignment and function
Power source voltage detection
Write
prohibition
Address
buffer
8bit
Data
register
16bit
High voltage occurrence
Address
decoder
R/W
amplifier
8bit
16bit
4,096 bit
EEPROM
Fig.30 Block diagram
Land No.
A1
A2
A3
B1
B2
B3
Pin Name
DI
DO
Vcc
SK
GND
CS
B
B1
B2
B3
(SK)
(GND)
(CS)
A
A1
A2
A3
(DI)
(DO)
(Vcc)
1
2
3
Fig.31 Pin assignment diagram
I/O
INPUT
OUTPUT
-
INPUT
-
INPUT
Function
Start Bit, Op.code, Address, Serial Data Input
Serial Data Output, Ready/Busy Status Output
Power Supply
Serial Data Clock Input
Grand (0V)
Chip Select
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7/17
2010.07 - Rev.A