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Serial-in / Parallel-out Driver Series
Serial / Parallel
2-input Drivers
BU2098F, BU2090F, BU2090FS
●Description
Serial-in-parallel-out driver is a open drain output driver. It incorporates a built-in shift register and a latch circuit to turn on a
maximum of 12 LED by a 2-line interface, linked to a microcontroller.
A open drain output provides maximum of 25mA current.
●Features
1) LED can be driven directly. (Output current 25mA)
2) 8/12 Bit parallel output
3) This product can be operated on low voltage.
4) Compatible with I2C BUS. (BU2098)
●Use
For AV equipment such as, audio stereo sets, videos and TV sets, PCs, control microcontroller mounted equipment.
●Line up
Parameter BU2098F BU2090F BU2090FS Unit
Output current 25 25 mA
Output line 8 12 lines
Package SOP16 SOP16 SSOP-A16 －
●Thermal derating curve
700
600
500
400
300
200
100
025 50 75 100 125 150 175
BU2090F
B
U
2
090
F
S
700
600
500
400
300
200
100
025 50 75 100 125 150 175
Power dissipation Pd [mW]
BU2098F
85℃
Ambient temperature Ta [℃]
Power dissipation Pd [mW]
No.11051EBT04
BU2098F, BU2090F, BU2090FS
Technical Note
2/12
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© 2011 ROHM Co., Ltd. All rights reserved.
●Electrical characteristics
BU2098F (unless otherwise noted, VDD=5V, Vss=0V, Ta=25℃)
Parameter Symbol Min. Typ. Max. Unit Condition
Input High-level voltage VIH 0.7×VDD - - V
Input Low-level voltage VIL - - 0.3×VDD V
Output Low-level voltage VOL - - 0.4 V IOUT=10mA
Input Low-level current IIL - 2.0 μA VIN=0
Input High-level current IIH - - -2.0 μA VIN=VDD
Output leakage current IOZ - - ±5.0 μA Output=High impedance
VOUT=VDD
Static dissipation current IDD - - 2.0 μA
BU2090F/BU2090FS (unless otherwise noted, VDD=5V, VSS=0V, Ta=25℃)
Parameter Symbol Min. Typ. Max. Unit Condition
Input High-level voltage VIH 3.5 - - V VDD=5V
2.5 - - V VDD=3V
Input Low-level voltage VIL - - 1.5 V VDD=5V
- - 0.4 V VDD=3V
Output Low-level voltage VOL - - 2.0 V VDD=5V,IOL=20mA
- - 1.0 V VDD=3V,IOL=5mA
“H” output disable current IOZH - - 10 μA VO=25V
“L” output disable current IOZL - -5.0 μA VO=0V
Static dissipation current IDD - - 5.0 μA VDD=5V
3.0 μA VDD=3V
●Operating conditions (Ta=25℃, VSS=0V)
Parameter Symbol Limits Unit
BU2098F BU2090F/BU2090FS
Power Supply Voltage VDD +2.7 to 5.5 V
Output Voltage Vo 0 to +15 0 to +25 V
●Absolute maximum ratings
BU2098F, BU2090F,BU2090FS
Parameter Symbol Limits Unit
BU2098F BU2090F BU2090FS
Power supply voltage VDD -0.5 to +7.0 -0.3 to +7.0V V
Power dissipation1 Pd1 300 *1 300 *1 500 *2 mW
Power dissipation2 Pd2 - 500 *3 650 *4
Operating temperature range Topr -40 to +85 ℃
Storage temperature range Tstg -55 to +125 ℃
Output voltage Vo VSS to +18.0 VSS-0.3 to +25V V
Input voltage VIN -0.5 to VDD+0.5 VSS-0.3 to VDD+0.3V V
Allowable loss of single unit
* Reduced by 3mW/℃ over 25℃. (BU2098F)
*1 Reduced by 3mW/℃ over 25℃.
*2 Reduced by 5mW/℃ over 25℃.
*3 Reduced by 5.0mW for each increase in Ta of 1℃ over 25℃.(When mounted on a board 70mm×70mm×1.6mm Glass-epoxy PCB)
*4 Reduced by 6.5mW for each increase in Ta of 1℃ over 25℃.(When mounted on a board 70mm×70mm×1.6mm Glass-epoxy PCB)
BU2098F, BU2090F, BU2090FS
Technical Note
3/12
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© 2011 ROHM Co., Ltd. All rights reserved.
●Pin descriptions
BU2098F
PIN No. Pin Name I/O Function
1 A0 I
Address input, internally pull-up 2 A1 I
3 A2 I
4 Q0
O Open drain output
5 Q1
6 Q2
7 Q3
8 VSS - GND
9 Q4
O Open drain output
10 Q5
11 Q6
12 Q7
13 N.C. - Non connected
14 SCL I
Serial clock input
15 SDA I/O
Serial data input/output
16 VDD -
Power supply
BU2090F/BU2090FS
PIN No. Pin Name I/O Function
1 VSS - GND
2 DATA I Serial data input
3 CLOCK I
Data shift clock input (rising edge trigger)
The shift data is transferred to the output when the input data logic
level is high during the falling transition of the clock pulse.
4 Q0
O
Parallel data output (Nch Open Drain FET)
Latch data L H
Output FET ON OFF
5 Q1
6 Q2
7 Q3
8 Q4
9 Q5
10 Q6
11 Q7
12 Q8
13 Q9
14 Q10
15 Q11
16 VDD -
Power supply
BU2098F, BU2090F, BU2090FS
Technical Note
4/12
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© 2011 ROHM Co., Ltd. All rights reserved.
●Block diagram
BU2098F
BU2090F/BU2090FS
●Interfaces
BU2090F/BU2090FS BU2090F/BU2090FS BU2098F
DATA, CLOCK Q0～Q11 Q0～Q7
BU2098F BU2098F BU2098F
A0～A2 SDA SCL
Power-On Reset
I2C BUS
Controller
Shift
Register
SD
A
SCL
A0
A1
A2
8bit
L
a
t
c
h
Write
Buffer
Q0～Q7
Controller
Shift
Register
12bit
L
a
t
c
h
Write
Buffer
Q0～Q11
CLOCK
DAT
A
GND (VSS)
OUT
GND (VSS)
OUT
IN
GND (VSS) GND (VSS)
VDD V
DD
IN
GND (VSS) GND (VSS)
VDD V
DD
VDD
GND (VSS)
IN
GND (VSS) GND (VSS)
VDD
IN
GND (VSS)GND (VSS)
VDD
GND (VSS)
BU2098F, BU2090F, BU2090FS
Technical Note
5/12
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© 2011 ROHM Co., Ltd. All rights reserved.
【BU2098F】
●AC characteristics (Unless otherwise noted, VDD=5V, VSS=0V, Ta=25℃)
Parameter Symbol Fast mode I2C BUS Standard mode I2C BUS Unit
Min. Max. Min. Max.
SCL clock frequency fSCL 0 400 0 100 kHz
Bus free time between start-stop condition tBUS 1.3 - 4.7 - μs
Hold time start condition tHD:STA 0.6 - 4.0 - μs
Low period of the SCL clock tLOW 1.3 - 4.7 - μs
High period of the SCL clock tHIGH 0.6 - 4.0 - μs
Set up time Re-start condition tSU:STA 0.6 - 4.7 - μs
Data hold time tHD:DAT 0 0.9 0 - μs
Data set up time tSU:DAT 100 - 250 - ns
Rise time of SDA and SCL tR 20+0.1Cb 300 - 1000 ns
Fall time of SDA and SCL tF 20+0.1Cb 300 - 300 ns
Set up time stop condition tSU:STO 0.6 - 4.0 - μs
Capacitive load for SDA line and SCL line Cb - 400 - 400 pF
●Timing chart
Fig.1 SDA, SCL timing chart
tBUS
SDA
P
tSU:STO
tHD:STA
Sr
tSU:STA
tSU:DAT
tf
tLOW
tHD:DAT
tr
S
P tHD:STA
SCL
BU2098F, BU2090F, BU2090FS
Technical Note
6/12
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●Function
○Start condition
The start condition is a “HIGH” to “LOW” transition of the SDA line while SCL is “HIGH”.
○Stop condition
The stop condition is a “LOW” to “HIGH” transition of the SDA line while SCL is “HIGH”.
Fig.2 Start / Stop condition
○Acknowledge
The master (μp) puts a resistive “HIGH” level on the SDA line during the acknowledge clock pulse. The peripheral (audio
processor) that acknowledge has to pull-down (“LOW”) the SDA line during the acknowledge clock pulse, so that the SDA
line is stable “LOW” during this clock pulse.
The slave which has been addressed has to generate an acknowledgement after the reception of each byte, otherwise the
SDA line remains at the “HIGH” level during the ninth clock pulse time. In this case the master transmitter can generate the
STOP information in order to abort the transfer.
Fig.3 Acknowledge
SD
A
SCL
S
Start
condition
P
Stop
condition
9 8
1
SCL
(from master)
SDA
(from master)
SDA
(from slave) S
not confirm
ACK signal
confirm
clock for acknowledge
BU2098F, BU2090F, BU2090FS
Technical Note
7/12
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○Write DATA
Send the stave address from master following the start condition (S). This address consists of 7 bits. The left 1 bit (the foot
bit) is fixed “0”. The stop condition (P) is needed to finish the data transferred. But the re-send starting condition (Sr)
enables to transfer the data without STOP (P).
Fig.4 DATA transmit
○Data format
The format is following.
Table 1 for WRITE format
Slave address
A0～A2 Each bit can be defined by the input levels of pins A0～A3.
A3～A6 These 4 bits are fixed.
R/W “0”
Write Data D0～D7 Write “1” to D0 makes Q0 pin High-impedance. And write “0” makes Q0 pin
LOW. D[1:7] and Q[1:7] are same as D0 and Q0.
Table 2 for (A2, A1, A0) to SLAVE ADDRESS
A6 A5 A4 A3 A2 A1 A0 Slave address
0 1 1 1 0 0 0 38H
0 1 1 1 0 0 1 39H
0 1 1 1 0 1 0 3AH
0 1 1 1 0 1 1 3BH
0 1 1 1 1 0 0 3CH
0 1 1 1 1 0 1 3DH
0 1 1 1 1 1 0 3EH
0 1 1 1 1 1 1 3FH
S slave address R/W ACK DATA ACK P
S slave address R/W ACK DATA ACK Sr slave address R/W ACK DATA ACK P
S A6 A5 A4 A3 A2 A1 A0 R/W ACK D6 D5 D4 D3 D2 D1 D0 D7 ACK P
SLAVE ADDRESS WRITE DATA
Fixed for BU2098F Defined by external pin A0～A2
“0” (Write)
“0” (Write)
“0” (Write)
BU2098F, BU2090F, BU2090FS
Technical Note
8/12
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○Data transmission timing
Fig.5 Timing chart for WRITE
Command sample for driving LEDs. These are all off. (terminal A0～A2 is open)
・RESET CONDITION
After reset, Q0～Q7 pins are ON. (LEDs are all ON.)
・RISING TIME OF POWER SUPPLY
V
DD must rise within 10ms. If the rise time would exceed 10ms, it is afraid not to reset the BU2098F.
Fig.6 Rising time of power supply
VDD
GND
t≦10ms
S A6 A5 A4 A3 A2 A1 A0 R/W ACK D6 D5 D4 D3 D2 D1 D0 D7 ACK P
Slave address Write data
Output the write data to Q7～Q0 at the same time.
SDA
Latch pulse
Output (Q7～Q0)
S 0 1 1 1 1 1 1 0 ACK 1 1 1 1 1 1 1 1ACK P
Slave address Write data
SDA
LEDs all-ON with power supply ON
LEDs are all-off by this command.
Power Supply ON
BU2098F, BU2090F, BU2090FS
Technical Note
9/12
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© 2011 ROHM Co., Ltd. All rights reserved.
【BU2090F/BU2090FS】
●AC characteristics (unless otherwise noted, VDD=5V, VSS=0V, Ta=25℃)
Parameter Symbol Limit Unit Condition
Min. Typ. Max.
Minimum clock frequency tw 500 - - ns VDD=5V
1000 - - ns VDD=3V
Data shift set up time tSU 200 - - ns VDD=5V
300 - - ns VDD=3V
Data shift hold time tH 200 - - ns VDD=5V
400 - - ns VDD=3V
Data latch set up time tLSUH 50 - - ns VDD=5V
100 - - ns VDD=3V
Data latch hold time tLHH 250 - - ns VDD=5V
500 - - ns VDD=3V
Data latch ”L”
set up time tLSUL 200 - - ns VDD=5V
400 - - ns VDD=3V
Data latch ”L”
hold time tLHL 250 - - ns VDD=5V
500 - - ns VDD=3V
●Switching time test circuit
Fig.7
●Switching time test waveforms
Fig.8
CLOCK
Pulse
Gen.
DATA
Pulse
Gen.
Q11
RL 10kΩ
±25V
Q0
RL 10kΩ
±25V
VDD
GND (Vss)
10% 10% 10% 10%
90%
90%
90%
tW tW
90%
90%
10% 10%
90% 90%
tLSUH tLHHtLSUL tLHL
tHtSU
CLOCK
DATA
VDD
GND (Vss)
VDD
GND (Vss)
BU2098F, BU2090F, BU2090FS
Technical Note
10/12
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© 2011 ROHM Co., Ltd. All rights reserved.
●Timing chart
【BU2098F】
【BU2090F/BU2090FS】
Note1) Indicates undefined output.
Note2) Output terminal is provided with a pull-up resistor.
SCL
SDA
VCC
1 2 3 4 5 6 7 89 12345678 9
Start condition Sto
p
condition
A6 A5 A4 A3 A2 A1
A0 RW ACK D7 D6 D5 D4 D3 D2 D1 D0 ACK
Device code
Slave address
External terminal
Note) Diagram shows a status where a pull-up resistor is connected to output.
Q7
Q6
Q5
Q4
Q3
Q2
Q1
Q0
CLOCK
DATA
Q11
Q10
Q9
Q8
Q5
Q4
Q3
Q2
Q1
Q0
Q6
Q7
D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
BU2098F, BU2090F, BU2090FS
Technical Note
11/12
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© 2011 ROHM Co., Ltd. All rights reserved.
●Notes for use
1. Absolute maximum ratings
An excess in the absolute maximum ratings, such as supply voltage, temperature range of operating conditions, etc., can
break down the devices, thus making impossible to identify breaking mode, such as a short circuit or an open circuit. If any
over rated values will expect to exceed the absolute maximum ratings, consider adding circuit protection devices, such as
fuses.
2. Connecting the power supply connector backward
Connecting of the power supply in reverse polarity can damage IC. Take precautions when connecting the power supply
lines. An external direction diode can be added.
3. Power supply lines
Design PCB layout pattern to provide low impedance GND and supply lines. To obtain a low noise ground and supply line,
separate the ground section and supply lines of the digital and analog blocks. Furthermore, for all power supply terminals
to ICs, connect a capacitor between the power supply and the GND terminal. When applying electrolytic capacitors in the
circuit, not that capacitance characteristic values are reduced at low temperatures.
4. GND voltage
The potential of GND pin must be minimum potential in all operating conditions.
5. Thermal design
Use a thermal design that allows for a sufficient margin in light of the power dissipation (Pd) in actual operating conditions.
6. Inter-pin shorts and mounting errors
Use caution when positioning the IC for mounting on printed circuit boards. The IC may be damaged if there is any
connection error or if pins are shorted together.
7. Actions in strong electromagnetic field
Use caution when using the IC in the presence of a strong electromagnetic field as doing so may cause the IC to
malfunction.
8. Testing on application boards
When testing the IC on an application board, connecting a capacitor to a pin with low impedance subjects the IC to stress.
Always discharge capacitors after each process or step. Always turn the IC's power supply off before connecting it to or
removing it from a jig or fixture during the inspection process. Ground the IC during assembly steps as an antistatic
measure. Use similar precaution when transporting or storing the IC.
9. Ground Wiring Pattern
When using both small signal and large current GND patterns, it is recommended to isolate the two ground patterns,
placing a single ground point at the ground potential of application so that the pattern wiring resistance and voltage
variations caused by large currents do not cause variations in the small signal ground voltage. Be careful not to change the
GND wiring pattern of any external components, either.
10. Unused input terminals
Connect all unused input terminals to VDD or VSS in order to prevent excessive current or oscillation.
Insertion of a resistor (100kΩ approx.) is also recommended.
BU2098F, BU2090F, BU2090FS
Technical Note
12/12
www.rohm.com 2011.12 - Rev.B
© 2011 ROHM Co., Ltd. All rights reserved.
●Ordering part number
B U 2 0 9 0 F S - E 2
Part No. Part No.
2098
2090
Package
F : SOP16
FS : SSOP-A16
Packaging and forming specification
E2: Embossed tape and reel
(Unit : mm)
SOP16
8
0.1
16
1.27
0.11
1
9
0.3MIN
10±0.2
0.15±0.1
0.4±0.1
1.5±0.1 6.2±0.3
4.4±0.2
(MAX 10.35 include BURR)
∗
Order quantity needs to be multiple of the minimum quantity.
<Tape and Reel information>
Embossed carrier tapeTape
Quantity
Direction
of feed
The direction is the 1pin of product is at the upper left when you hold
reel on the left hand and you pull out the tape on the right hand
2500pcs
E2
()
Direction of feed
Reel 1pin
∗
Order quantity needs to be multiple of the minimum quantity.
<Tape and Reel information>
Embossed carrier tapeTape
Quantity
Direction
of feed
The direction is the 1pin of product is at the upper left when you hold
reel on the left hand and you pull out the tape on the right hand
2500pcs
E2
()
Direction of feed
Reel 1pin
(Unit : mm)
SSOP-A16
13
87
0.8
9
0.11
15
453
11
0.3MIN
2
1216 14
61
10
6.6±0.2
0.15±0.1
0.36±0.1
1.5±0.1 6.2±0.3
4.4±0.2
(MAX 6.95 include BURR)
0.1
R1120
A
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Notes
No copying or reproduction of this document, in part or in whole, is permitted without the
consent of ROHM Co.,Ltd.
The content specied herein is subject to change for improvement without notice.
The content specied herein is for the purpose of introducing ROHM's products (hereinafter
"Products"). If you wish to use any such Product, please be sure to refer to the specications,
which can be obtained from ROHM upon request.
Examples of application circuits, circuit constants and any other information contained herein
illustrate the standard usage and operations of the Products. The peripheral conditions must
be taken into account when designing circuits for mass production.
Great care was taken in ensuring the accuracy of the information specied in this document.
However, should you incur any damage arising from any inaccuracy or misprint of such
information, ROHM shall bear no responsibility for such damage.
The technical information specied herein is intended only to show the typical functions of and
examples of application circuits for the Products. ROHM does not grant you, explicitly or
implicitly, any license to use or exercise intellectual property or other rights held by ROHM and
other parties. ROHM shall bear no responsibility whatsoever for any dispute arising from the
use of such technical information.
The Products specied in this document are intended to be used with general-use electronic
equipment or devices (such as audio visual equipment, ofce-automation equipment, commu-
nication devices, electronic appliances and amusement devices).
The Products specied in this document are not designed to be radiation tolerant.
While ROHM always makes efforts to enhance the quality and reliability of its Products, a
Product may fail or malfunction for a variety of reasons.
Please be sure to implement in your equipment using the Products safety measures to guard
against the possibility of physical injury, re or any other damage caused in the event of the
failure of any Product, such as derating, redundancy, re control and fail-safe designs. ROHM
shall bear no responsibility whatsoever for your use of any Product outside of the prescribed
scope or not in accordance with the instruction manual.
The Products are not designed or manufactured to be used with any equipment, device or
system which requires an extremely high level of reliability the failure or malfunction of which
may result in a direct threat to human life or create a risk of human injury (such as a medical
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controller or other safety device). ROHM shall bear no responsibility in any way for use of any
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