BR93L86-W Rohm Semiconductor, BR93L86-W Datasheet - Page 35

• 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

© 2011 ROHM Co., Ltd. All rights reserved.
BR93L□□-W Series, 93A□□-WM Series, BR93H□□-WC Series
www.rohm.com
5) Notes at test pin wrong input
4-4) DO status READY output timing
There is no influence of external input upon TEST2 pin.
For TEST1 (TEST)pin, input must be GND or OPEN. If H level is input, the following may occur,
1. At WEN, WDS, READ command input
2. WRITE, WRAL command input
(When the microcontroller DI/O is “L”, EEPROM DO outputs “H”, and “L” is input to DI)
・Set the EEPROM input level VIL so as to satisfy the following.
Example) When Vcc=5V, VOHM=5V, IOHM=0.4mA, VOLM=5V, IOLM=0.4mA,
There is no influence by TEST1 (TEST) pin.
a：There is no influence by TEST1 (TEST) pin.
b：If H during write execution, it may not be written correctly. And H area remains BUSY and READY does not go back.
Start bit
Fig.51 TEST1(TEST) pin wrong input timing
1bits
Avoid noise input, and at use, be sure to connect it to GND terminal or set it OPEN.
Fig.50 Circuit at DI, DO direct connection (Microcontroller DI/O “L” output, EEPROM “H” output)
Microcontroller
“L” output
∴
From the equation ⑦,
R ≧
R ≧
R ≧ 12.5 [kΩ]
DI/O PORT
VOLM
Ope code
IOHM
2bits
0.4×10
VOHM
IOHM
5
VOHE
R
a
-3
* BR93H56-WC, BR93H66-WC, address 8 bits
DO
DI
BR93H76-WC, BR93H86-WC, address 10 bits
・・・⑨
EEPROM
“H” output
Address*
8bits
Data
35/40
From the equation ⑧,
16bits
∴
Therefore, from the equations ⑨ and ⑩,
∴
Write start
CS rise timing
R ≧
R ≧
R ≧ 2.2 [kΩ]
R ≧ 12.5 [kΩ]
t
As this moment, if VOHE=Vcc,
E/W
Conditions
Vcc – VOLM
2.1×10
5 – 0.4
・VILE
・VOHE
・VOLM
・IOLM
IOLM
∴
VOLM ≧ VILE
VOLM ≧ VOHE – IOLM×R
VOLM ≧ Vcc – IOLM×R
-3
・・・⑩
: EEPROM VIL specifications
: EEPROM VOH specifications
: Microcontroller VOL specifications
: Microcontroller IOL specifications
R ≧
Vcc – VOLM
IOLM
Technical Note
2011.02 - Rev.F
・・・⑧