BR93L66RF-WE2 Rohm Semiconductor, BR93L66RF-WE2 Datasheet - Page 14

• Manufacturer Part Number: BR93L66RF-WE2
• Description: IC EEPROM 4KBIT 2MHZ 8SOP
• Manufacturer: Rohm Semiconductor

Specifications of BR93L66RF-WE2

• Memory Size: 4K (256 x 16)
• Format - Memory: EEPROMs - Serial
• Memory Type: EEPROM
• Speed: 2MHz
• Interface: Microwire, 3-Wire Serial
• Voltage - Supply: 1.8 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 8-SOP
• Clock Frequency: 2MHz
• Supply Voltage Range: 1.8V To 5.5V
• Memory Case Style: SOP
• No. Of Pins: 8
• Operating Temperature Range: -40°C To +85°C
• Svhc: No SVHC (18-Jun-2010)
• Package /: RoHS Compliant
• Memory Configuration: 256 X 16
• Interface Type: Serial, Microwire
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The resistance R becomes through current limit resistance at data collision. When through current flows, noises of
power source line and instantaneous stop of power source may occur. When allowable through current is defined as I,
the following relation should be satisfied. Determine allowable current amount in consideration of impedance and so
forth of power source line in set. And insert resistance R, and set the value R to satisfy EEPROM input level VIH/VIL
even under influence of voltage decline owing to leak current and so forth. Insertion of R will not cause any influence
upon basic operations.
Selection of resistance value R
(1) Address data A0 = "1" input, dummy bit "0" output timing
(2) DO status READY output timing
Fig. 59 Circuit at DI, DO direct connection (Microcontroller DI/O "H" output, EEPROM "L" output)
Fig. 60 Circuit at DI, DO direct connection (Microcontroller DI/O "L" output, EEPROM "H" output)
Example) When Vcc = 5V, VOHM = 5V, IOHM = 0.4mA, VOLM = 5V, IOLM = 0.4mA,
(When microcontroller DI/O output is "H", EEPROM DO outputs "L", and "H" is input to DI)
(When the microcontroller DI/O is "L", EEPROM DO outputs "H", and "L" is input to DI)
Make the through current to EEPROM 10mA or below.
See to it that the input level VIH of EEPROM should satisfy the following.
Set the EEPROM input level VIL so as to satisfy the following.
Microcontroller
Microcontroller
"L" output
"H" output
From the equation
DI/O PORT
DI/O PORT
R
R
R
VOLM
VOHM
IOHM
IOHM
≥
≥
≥ 12.5 [k ]
0.4×10
VOLE
VOHE
VOHM
IOHM
R
R
,
5
DI
DO
DI
DO
-3
. . .
"H" output
EEPROM
EEPROM
"L" output
14/16
Therefore, from the equations
From the equation
R
R
R
R
At this moment, if VOLE = 0V,
At this moment, VOHE=V
Conditions
Conditions
≥ 12.5 [k ]
≥
≥
≥ 2.2 [k ]
VIHE : EEPROM VIH specifications
VOLE : EEPROM VOL specifications
VOHM : Microcontroller VOH specifications
IOHM : Microcontroller IOH specifications
VILE
VOHE : EEPROM VOH specifications
VOLM : Microcontroller VOL specifications
IOLM : Microcontroller IOL specifications
V
2.1×10
CC
5 - 0.4
VOHM
VOHM
VOHM
VOLM
VOLM
VOLM
IOLM
,
- VOLM
R
R
: EEPROM VIL specifications
-3
. . .
≤
≤
≤
≥
≥
≥
≥
≥
and
CC
VOHM
VIHE
IOHM × R + VOLE
IOHM × R
IOHM
VILE
VOHE - IOLM × R
V
V
,
CC
CC
IOLM
- IOLM × R
- VOLM
,
. . .
. . .