ROHM BU9891GUL-W User Guide
Summary
This high-reliability serial EEPROM provides robust non-volatile data storage using a simple 3-line interface method. Featuring low power consumption, up to 2MHz operating speed, and excellent data retention, this memory is ideal for various embedded systems. The comprehensive manual details all electrical specifications, timing characteristics, absolute ratings, and recommended operational conditions (1.7V–5.5V). It is designed for engineers developing general-use electronic equipment such as consumer audio-visual devices, communication gear, or office automation hardware requiring stable memory solutions.
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High Reliability Serial EEPROMs
WL-CSP EEPROM family Microwire Bus
BU9891GUL-W No.10001EAT10
●Description BU9891GUL-W is serial EEPROM of serial 3-line interface method
●Features 1) 3-line communications of chip select, serial clock, serial data input / output (the case where input and output are shared) 2) Actions available at high speed 2MHz clock (2.5~5.5V) 3) Speed write available (write time 5ms max.) 4) 1.7~5.5V single power source action 5) Address auto increment function at read action 6) Write mistake prevention function Write prohibition at power on Write prohibition by command code Write mistake prevention function at low voltage 7) Program cycle auto delete and auto end function 8) Program condition display by READY / BUSY 9) Low current consumption At write action (at 5V): 1.2m A (Typ.) At read action (at 5V): 0.3m A (Typ.) At standby action (at 5V): 0.1μA (Typ.) (CMOS input) 10) Data retention for 40 years 11) Data rewrite up to 100,000 times 12) Data at shipment all addresses FFFFh
Capacity Bit format Type Power source voltage Package type
4Kbit 256×16 BU9891GUL-W 1.7~5.5V VCSP50L1
●Absolute Maximum Ratings(Ta=25℃)
Parameter Symbol Ratings Unit
Impressed voltage VCC -0.3~+6.5 V
Permissible dissipation Pd 220 (VCSP50L1 ) *1 m W
Storage temperature range Tstg -65~+125 ℃
Action temperature range Topr -40~+85 ℃
Terminal voltage ‐ -0.3~VCC+0.3 V * When using at Ta=25℃ or higher, 2.2m W (to be reduced per 1℃.
www.rohm.com 2010.07 - Rev.A
© 2010 ROHM Co., Ltd. All rights reserved.
Page Summary Contents For ROHM BU9891GUL-W User Guide
Manual Details
| Brand | ROHM |
|---|---|
| Pages | 18 |
| File Size | 465.04 KB |
| Published | July 10, 2026 |
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Frequently Asked Questions
What is the recommended operating voltage range for this EEPROM?
The suggested power source voltage (VCC) ranges from 1.7V to 5.5V.
How many times can the data be rewritten in this chip?
The device supports up to 100,000 data rewrite times at Ta=25℃.
What are the typical current consumption rates during operation?
At 5V, standby draw is 0.1μA, write action consumes 1.2mA, and read action consumes 0.3mA.
Is this product suitable for high-reliability or aerospace applications?
No, it is not designed or manufactured for equipment requiring extremely high levels of reliability or direct life support systems.