BR93L86-W Rohm Semiconductor, BR93L86-W Datasheet - Page 16

IC EEPROM 16KBIT 2MHZ 8DIP

BR93L86-W

Manufacturer Part Number
BR93L86-W
Description
IC EEPROM 16KBIT 2MHZ 8DIP
Manufacturer
Rohm Semiconductor
Datasheet

Specifications of BR93L86-W

Format - Memory
EEPROMs - Serial
Memory Type
EEPROM
Memory Size
16K (1K x 16)
Speed
2MHz
Interface
Microwire, 3-Wire Serial
Voltage - Supply
1.8 V ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Package / Case
8-DIP (0.300", 7.62mm)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

Available stocks

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Manufacturer
Quantity
Price
Part Number:
BR93L86-W
Manufacturer:
ROHM
Quantity:
2 025
Part Number:
BR93L86-W
Manufacturer:
ROHM
Quantity:
5 339
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3) Equivalent circuit
4) I/O peripheral circuit
4-1) Pull down CS.
○Pull down resistance Rpd of CS pin
4-2) DO is available in both pull up and pull down.
By making CS=“L” at power ON/OFF, mistake in operation and mistake write are prevented.
To prevent mistake in operation and mistake write at power ON/OFF, CS pull down resistance is necessary. Select an
appropriate value to this resistance value from microcontroller VOH, IOH, and VIL characteristics of this IC.
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 this
as 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.
Microcontroller
“H” output
Output circuit
Input circuit
DI
VOHM
Fig.75 CS pull down resistance
IOHM
Fig.71 Output circuit (DO)
Fig.73 Input circuit (DI)
CS
SK
DI
DO
High-Z
D0
OEint.
Rpd
CS int.
VIHE
Fig.76 READY output timing at DO=OPEN
“L” input
EEPROM
BUSY
READY
Enlarged
16/40
DO
With the value of Rpd to satisfy the above equation, VOHM becomes
2.4V or higher, and VIHE (=2.0V), the equation ② is also satisfied.
Example) When V
・VIHE
・VOHM
・IOHM
DO
CS
SK
DI
DO
∴ Rpd ≧ 1.2 [kΩ]
from the equation ①,
Input citcuit
VOHM ≧ VIHE
CS
Input circuit
SK
BUSY
BUSY
“H”
: EEPROM VIH specifications
: Microcontroller VOH specifications
: Microcontroller IOH specifications
Rpd ≧
Rpd ≧
CC
Improvement by DO pull up
=5V, VIHE=2V, VOHM=2.4V, IOHM=2mA,
Fig.72 Input circuit (CS)
Fig.74 Input circuit (SK)
READY
VOHM
IOHM
2×10
High-Z
2.4
-3
RESET int.
When DO=pull up
When DO=OPEN
CS=SK=DI=”H”
CS=SK=DI=”H”
・・・②
・・・①
CS int.
Technical Note
2011.02 - Rev.F
CSint.

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