IC EEPROM 1KBIT 2MHZ 8SSOP

 

BR93L46FV-WE2

Manufacturer Part NumberBR93L46FV-WE2
DescriptionIC EEPROM 1KBIT 2MHZ 8SSOP
ManufacturerRohm Semiconductor
BR93L46FV-WE2 datasheets

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Specifications of BR93L46FV-WE2

Format - MemoryEEPROMs - SerialMemory TypeEEPROM
Memory Size1K (64 x 16)Speed2MHz
InterfaceMicrowire, 3-Wire SerialVoltage - Supply1.8 V ~ 5.5 V
Operating Temperature-40°C ~ 85°CPackage / Case8-SSOP
Lead Free Status / RoHS StatusLead free / RoHS CompliantOther namesBR93L46FV-WE2
BR93L46FV-WE2TR
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BR93L□□-W Series, 93A□□-WM Series, BR93H□□-WC Series
3-2) DO is available in both pull up and pull down.
Do output become “High-Z” in other READY / BUSY output timing than after data output at read command and write
command. When malfunction occurs at “High-Z” input of the microcontroller port connected to DO, it is necessary to
pull down and pull up DO. When there is no influence upon the microcontroller actions, DO may be OPEN. If DO is
OPEN, and at timing to output status READY, at timing of CS=“H”, SK=“H”, DI=“H”, EEPROM recognizes thisas a
start bit, resets READY output, and DO=”High-Z”, therefore, READY signal cannot be detected. To avoid such output,
pull up DO pin for improvement.
CS
SK
D0
DI
High-Z
DO
Fig.42 READY output timing at DO=OPEN
○Pull up resistance Rpu and pull down resistance Rpd of DO pin
As for pull up and pull down resistance value, select an appropriate value to this resistance value from microcontroller
VIH, VIL, and VOH, IOH, VOL, IOL characteristics of this IC.
Microcontroller
Rpu
IOLE
VILM
“L” input
・VOLE
・IOLE
・VILM
Fig.43 DO pull up resistance
Microcontroller
VIHM
IOHE
“H” input
Rpd
Fig.44 DO pull down resistance
www.rohm.com
© 2011 ROHM Co., Ltd. All rights reserved.
CS
“H”
SK
Enlarged
DI
READY
DO
BUSY
BUSY
Improvement by DO pull up
READY
DO
BUSY
EEPROM
Example) When V
VOLE
from the equation ③,
“L” output
∴
With the value of Rpu to satisfy the above equation, VOLE becomes 0.4V or
below, and with VILM(=0.8V), the equation ④ is also satisfied.
・VOLE
・IOLE
・VILM
EEPROM
Example) When V
VOHE
“H” output
∴
With the value of Rpd to satisfy the above equation, VOHE becomes 2.4V or
below, and with VIHM (=3.5V), the equation ⑥ is also satisfied.
・VOHE
・IOHE
・VIHM
32/40
Technical Note
CS=SK=DI=”H”
High-Z
When DO=OPEN
CS=SK=DI=”H”
When DO=pull up
Vcc－VOLE
Rpu ≧
・・・③
IOLE
VOLE ≦ VILM
・・・④
=5V, VOLE=0.4V, IOLE=2.1mA, VILM=0.8V,
CC
5－0.4
Rpu ≧
-3
2.1×10
Rpu ≧ 2.2 [kΩ]
: EEPROM VOL specifications
: EEPROM IOL specifications
: Microcontroller VIL specifications
VOHE
Rpd ≧
・・・⑤
IOHE
VOHE ≧ VIHM
・・・⑥
=5V, VOHE=Vcc－0.2V, IOHE=0.1mA,
CC
VIHM=Vcc×0.7V from the equation ⑤
5－0.2
Rpd ≧
-3
0.1×10
Rpd ≧ 48 [kΩ]
: EEPROM VOH specifications
: EEPROM IOH specifications
: Microcontroller VIH specifications
2011.02 - Rev.F

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