BU9877FV Datasheet, PDF (2/9 Pages) Rohm – Serial interface IC for DIMMs supporting plug & play

Memory ICs
•^{Block diagram}
BU9877FV
A0 1
A1 2
A2 ³
GND 4
8bit
Address
Decoder
2048bit EEPROM Array
8bit
Slave · word
Address Register
START
STOP
Control Circuit
Write Protect Control Circuit
High voltage generator
Power supply voltage detector
8bit
Data
Register
ACK
8 Vcc
7 WP
6 SCL
5 SDA
•^{Pin descriptions}
Pin No.
Pin name
1, 2, 3
A0, A1, A2
4
GND
5
SDA
6
SCL
7
WP
8
VCC
I/O
Function
I
Slave address setting (pin)
—
Input / output reference voltage of 0V
I/O
Slave and word address, serial data input / output
I
Serial clock input
I
Write protect input
—
Connect the power supply to this.
Note: The SDA pin is Nch open drain output, and should be used with external pull-up resistor.
The WP pin is equipped with internal pull-down resistor, so can be left open when used.
•^{Electrical characteristics (unless otherwise noted, Ta = – 40 to + 85°C, Vcc = 2.7V to 5.5V)}
Parameter
Symbol Min. Typ. Max. Unit
Conditions
Input high level voltage
VIH
0.7VCC
—
—
V
—
Input low level voltage
VIL
—
—
0.3VCC
V
—
Output low level voltage VOL
—
—
0.4
V
IOL = 3.0mA (SDA)
Input leakage current 1
ILI 1
–1
—
1
µA
VIN = 0V ~ VCC
Input leakage current 2
ILI 2
–1
—
20
µA
VIN = 0V ~ VCC (WP)
Output leakage current
ILO
–1
—
1
µA
VOUT = 0V ~ VCC
Operating current
consumption
ICC
—
—
3.0
mA VCC = 5.5V, fSCL = 100kHz
Standby current
ISB
—
—
2.0
µA VCC = 5.5V, SDA · SCL = VCC
SCL frequency
fSCL
—
—
100
kHz
—
Measurement circuit
—
—
Fig.1
Fig.2
Fig.2
Fig.2
Fig.3
Fig.4
—
2