BR93L86-W Rohm Semiconductor, BR93L86-W Datasheet - Page 11

• 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

●Description of operations
●Command mode
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BR93L□□-W Series, 93A□□-WM Series, BR93H□□-WC Series
www.rohm.com
・ Input the address and the data in MSB first manners.
・ As for *, input either VIH or VIL.
*Start bit
*1 As for read, by continuous SK clock input after setting the read command, data output of the set address starts, and
*2 When the read and the write all commands are executed, data written in the selected memory cell is automatically deleted, and input data is written.
Communications of the Microwire Bus are carried out by SK (serial clock), DI (serial data input),DO (serial data output) ,and
CS (chip select) for device selection.
When to connect one EEPROM to a microcontroller, connect it as shown in Fig.59(a) or Fig.59(b). When to use the input and
output common I/O port of the microcontroller, connect DI and DO via a resistor as shown in Fig.59(b) (Refer to pages
17/35.), and connection by 3 lines is available.
In the case of plural connections, refer to Fig. 59 (c).
input of the start bit, input ope code, address and data. Address and data are input all in MSB first manners.
“0” input after the rise of CS to the start bit input is all ignored. Therefore, when there is limitation in the bit width of PIO of the
microcontroller, input “0” before the start bit input, to control the bit width.
Communications of the Microwire Bus are started by the first “1” input after the rise of CS. This input is called a start bit. After
Read (READ)
Write enable (WEN)
Write (WRITE)
Write all (WRAL)
Write disable (WDS)
Erase (ERASE)
Chip erase (ERAL)
Acceptance of all the commands of this IC starts at recognition of the start bit.
The start bit means the first “1” input after the rise of CS.
Fig.59-(a) Connection by 4 lines
controller
address data in significant order are sequentially output continuously. (Auto increment function)
Micro-
DO
CS
SK
Command
DI
*1
*2
*2
BR93LXX
/AXX
CS
SK
DI
DO
Start
bit
1
1
1
1
1
1
1
code
Ope
10
00
01
00
00
11
00
Fig.59-(b) Connection by 3 lines
controller
Micro-
A5,A4,A3,A2,A1,A0
A5,A4,A3,A2,A1,A0
A5,A4,A3,A2,A1,A0
BR93A46-WM
DO
CS
SK
BR93L46-W
1 1 * * * *
0 1 * * * *
0 0 * * * *
1 0 * * * *
Fig.59 Connection method with microcontroller
BR93LXX
/AXX
CS
SK
DI
DO
11/40
A7,A6,A5,A4,A3,A2,A1,A0
A7,A6,A5,A4,A3,A2,A1,A0
A7,A6,A5,A4,A3,A2,A1,A0
BR93A56/66-WM
BR93L56/66-W
1 1 * * * * * *
0 1 * * * * * *
0 0 * * * * * *
1 0 * * * * * *
Address
controller
A7 of BR93L56-W/A56-WM becomes Don't Care.
A9 of BR93L76-W/A76-WM becomes Don't Care.
Fig.59-(c) Connection example of plural devices
Micro-
CS3
CS1
CS0
DO
SK
DI
A9,A8,A7,A6,A5,A4,A3,A2,A1,A0
A9,A8,A7,A6,A5,A4,A3,A2,A1,A0
A9,A8,A7,A6,A5,A4,A3,A2,A1,A0
Device 1
BR93A76/86-WM
1 1 * * * * * * * *
0 1 * * * * * * * *
0 0 * * * * * * * *
1 0 * * * * * * * *
BR93L76/86-W
Device 2
Technical Note
2011.02 - Rev.F
D15~D0(READ DATA)
D15~D0(WRITE DATA)
D15~D0(WRITE DATA)
Device 3
Data