BR93L86-W Rohm Semiconductor, BR93L86-W Datasheet - Page 33

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

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

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BR93L□□-W Series, 93A□□-WM Series, BR93H□□-WC Series
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4) When to directly connect DI and DO
（DO status）
○READY / BUSY status display (DO terminal)
（DO status）
This IC has independent input terminal DI and output terminal DO, and separate signals are handled on timing chart,
meanwhile, by inserting a resistance R between these DI and DO terminals, it is possible to carry out control by 1 control line.
○Data collision of microcontroller DI/O output and DO output and feedback of DO output to DI input.
(common to BR93H56-WC, BR93H66-WC, BR93H76-WC, BR93H86-WC)
This display outputs the internal status signal. When CS is started after tCS (Min.200ns)
from CS fall after write command input, “H” or “L” output.
R/B display＝“L” (BUSY) = write under execution
accepted.
R/B display = “H” (READY) = command wait status
DI=“L” in the area
*Do not input any command while status signal is output. Command input in BUSY area is cancelled, but command input in READY area is accepted.
Therefore, status READY output is cancelled, and malfunction and mistake write may be made.
Drive from the microcontroller DI/O output to DI input on I/O timing, and signal output from DO output occur at the
same time in the following points.
4-1) 1 clock cycle to take in A0 address data at read command
Dummy bit “0” is output to DO terminal.
→When address data A0 = “1” input, through current route occurs.
After the timer circuit in the IC works and creates the period of tE/W, this time circuit completes automatically.
And write to the memory cell is made in the period of tE/W, and during this period, other command is not
Even after tE/W (max.10ms) from write of the memory cell, the following command is accepted.
Therefore, CS=“H” in the period of tE/W, and when input is in SK, DI, malfunction may occur, therefore,
CS=“H”. (Especially, in the case of shared input port, attention is required.)
CS
SK
DI
DO
High-Z
Fig.47 Collision timing at read data output at DI, DO direct connection
EEPROM CS input
EEPROM SK input
EEPROM DI input
EEPROM DO output
Microcontroller DI/O port
WRITE
INSTRUCTION
CLOCK
Fig.45 R/B status output timing chart
Fig.46 DI, DO control line common connection
Microcontroller
Microcontroller output
“H”
DI/O PORT
High-Z
A1
A1
R
t
SV
BUSY
A0
A0
STATUS
0
Microcontroller input
33/40
D15 D14 D13
DI
DO
EEPROM
Collision of DI input and DO output
READY
High-Z
Technical Note
2011.02 - Rev.F