- 您现在的位置：买卖IC网 > Datasheet目录316 > BU9891GUL-WE2 (Rohm Semiconductor)IC EEPROM 4KBIT VCSP T/R Datasheet资料下载
参数资料
| 型号： | BU9891GUL-WE2 |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 19/25页 |
| 文件大小： | 0K |
| 描述： | IC EEPROM 4KBIT VCSP T/R |
| 标准包装： | 3,000 |
| 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： | 1.7 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 6-UFBGA，CSPBGA |
| 供应商设备封装： | VCSP50L1 |
| 包装： | 带卷 (TR) |
BU9891GUL-W (4Kbit)
Datasheet
7) Notes on power ON/OFF
? At power ON/OFF, set CS “L”.
When CS is “H”, this IC gets in input accept status (active). If power is turned on in this status, noises and the likes may
cause malfunction, mistake write or so. To prevent these, at power ON, set CS “L”. (When CS is in “L” status, all inputs
are cancelled.) And at power decline, owing to power line capacity and so forth, low power status may continue long. At
this case too, owing to the same reason, malfunction, mistake write may occur, therefore, at power OFF too, set CS
“L”.
V VCC
V VCC
GND
VCC
CS
GND
Bad example
Good example
Figure 53. Timing at power ON/OFF
(Bad example)CS pin is pulled up to Vcc.
In this case, CS becomes “H” (active status), and EEPROM may have malfunction,
mistake write owing to noise and the likes.
Even when CS input is High-Z, the status becomes like this case, which please note.
(Good example)It is “L” at power ON/OFF.
Set 10ms or higher to recharge at power OFF.
When power is turned on without observing this condition,
IC internal circuit may not be reset, which please note.
○ POR citcuit
This IC has a POR (Power On Reset) circuit as a mistake write countermeasure. After POR action, it gets in write
disable status. The POR circuit is valid only when power is ON, and does not work when power is OFF. However, if CS
is “H” at power ON/OFF, it may become write enable status owing to noises and the likes. For secure actions, observe
the follwing conditions.
1. Set CS=”L”
2. Turn on power so as to satisfy the recommended conditions of t R , t OFF , Vbot for POR circuit action.
t R
V CC
Recommended conditions of t R , t OFF , Vbot
t R
10ms or below
t OFF
10ms or higher
V bot
0.3V or below
t OFF
Vbot
100ms or below
10ms or higher
0.2V or below
0
Figure 54. Rise waveform diagram
○ LVCC circuit
LVCC (V CC -Lockout) circuit prevents data rewrite action at low power, and prevents wrong write.
At LVCC voltage (Typ.=1.2V) or below, it prevent data rewrite.
8) Noise countermeasures
V CC noise (bypass capacitor)
When noise or surge gets in the power source line, malfunction may occur, therefore, for removing these, it is
recommended to attach a by pass capacitor (0.1μF) between IC V CC and GND, At that moment, attach it as close to IC
as possible.And, it is also recommended to attach a bypass capacitor between board V CC and GND.
SK noise
When the rise time (t R ) of SK is long, and a certain degree or more of noise exists, malfunction may occur owing to
clock bit displacement. To avoid this, a Schmitt trigger circuit is built in SK input. The hysteresis width of this circuit is
set about 0.2V, if noises exist at SK input, set the noise amplitude 0.2Vp-p or below. And it is recommended to set the
rise time (t R ) of SK 100ns or below. In the case when the rise time is 100ns or higher, take sufficient noise
countermeasures. Make the clock rise, fall time as small as possible.
www.rohm.com
? 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111 ? 15 ? 001
19/22
TSZ02201-0R2R0G100440-1-2
3.SEP.2012 Rev.001
相关PDF资料 |
PDF描述 |
|---|---|
| BU9897GUL-WE2 | IC EEPROM SERIAL VCSP50L2 |
| BU99901GUZ-WE2 | IC EEPROM 32KBIT 2WIRE VCSP |
| BUK218-50DY,118 | TOPFET DUAL SWITCH D2PAK |
| BVL121200003N | BATTERY CHG UNIV 12VDC @ 1.2A |
| BVW241250003A | BATTERY CHG UNIV 24VDC @ 1.25A |
相关代理商/技术参数 |
参数描述 |
|---|---|
| BU9897GUL-W | 制造商:ROHM 制造商全称:Rohm 功能描述:Silicon Monolithic Integrated Circuit |
| BU9897GUL-W_11 | 制造商:ROHM 制造商全称:Rohm 功能描述:High Reliability Series Serial EEPROMs WL-CSP EEPROM family I2C BUS |
| BU9897GUL-WE2 | 功能描述:电可擦除可编程只读存储器 Serial 电可擦除可编程只读存储器 I2C BUS 128Kb RoHS:否 制造商:Atmel 存储容量:2 Kbit 组织:256 B x 8 数据保留:100 yr 最大时钟频率:1000 KHz 最大工作电流:6 uA 工作电源电压:1.7 V to 5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 |
| BU99022NUX-3TR | 功能描述:IC EEPROM I2C BUS 2KB 8VSON 制造商:rohm semiconductor 系列:- 包装:剪切带（CT） 零件状态:有效 格式 - 存储器:EEPROMs - 串行 存储器类型:EEPROM 存储容量:4K （256 x 8 x 2） 速度:400kHz 接口:I2C，2 线串口 电压 - 电源:1.7 V ~ 5.5 V 工作温度:-40°C ~ 85°C（TA） 封装/外壳:8-UFDFN 裸露焊盘 供应商器件封装:VSON008X2030 标准包装:1 |
| BU9910KV | 制造商:ROHM 制造商全称:Rohm 功能描述:Status display LCD driver for PCs with I2C Bus interface |
发布紧急采购，3分钟左右您将得到回复。