参数资料
型号: BR93L66-W
厂商: Rohm Semiconductor
文件页数: 35/41页
文件大小: 0K
描述: IC EEPROM 4KBIT 2MHZ 8DIP
标准包装: 2,000
格式 - 存储器: EEPROMs - 串行
存储器类型: EEPROM
存储容量: 4K (256 x 16)
速度: 2MHz
接口: Microwire 3 线串行
电源电压: 1.8 V ~ 5.5 V
工作温度: -40°C ~ 85°C
封装/外壳: 8-DIP(0.300",7.62mm)
供应商设备封装: 8-DIP
包装: 管件
产品目录页面: 1380 (CN2011-ZH PDF)
BR93L -W Series, 93A □□ -WM Series, BR93H □□ -WC Series
4-4) DO status READY output timing
(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.
Conditions
Technical Note
Microcontroller
EEPROM
VOLM ≧ VILE
“L” output
DI/O PORT
VOLM
IOHM
R
DI
VOLM ≧ VOHE – IOLM × R
As this moment, if VOHE=Vcc,
VOLM ≧ Vcc – IOLM × R
DO
VOHE
“H” output
R ≧
Vcc – VOLM
IOLM
???⑧
? VILE
? VOHE
? VOLM
? IOLM
Example) When Vcc=5V, VOHM=5V, IOHM=0.4mA, VOLM=5V, IOLM=0.4mA,
: EEPROM VIL specifications
: EEPROM VOH specifications
: Microcontroller VOL specifications
: Microcontroller IOL specifications
From the equation ⑦ ,
From the equation ⑧ ,
0.4 × 10
2.1 × 10
R ≧
R ≧
VOHM
IOHM
5
-3
R ≧
R ≧
V cc – VOLM
IOLM
5 – 0.4
-3
R ≧
12.5 [k ? ]
???⑨
R ≧
2.2 [k ? ]
???⑩
Therefore, from the equations ⑨ and ⑩ ,
R ≧
12.5 [k ? ]
Fig.50
Circuit at DI, DO direct connection (Microcontroller DI/O “L” output, EEPROM “H” output)
5) Notes at test pin wrong input
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
There is no influence by TEST1 (TEST) pin.
2. WRITE, WRAL command input
* BR93H56-WC, BR93H66-WC, address 8 bits
BR93H76-WC, BR93H86-WC, address 10 bits
Start bit
1bits
Ope code
2bits
Address*
8bits
Data
16bits
t E/W
a
Write start
CS rise timing
Fig.51 TEST1(TEST) pin wrong input timing
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.
Avoid noise input, and at use, be sure to connect it to GND terminal or set it OPEN.
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? 2011 ROHM Co., Ltd. All rights reserved.
35/40
2011.09 - Rev.G
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