ROHM BA829 Technical data
Serial-in / Parallel-out Driver Series
Serial / Parallel
5-input Driver
BA829
No.09051EAT02
●Description
Serial-in-parallel-out driver is a constant-current output driver with a built-in shift register and a latch circuit to turn on a
maximum of 8 LED by a 5-line interface linked to a microcontroller. Output current value of constant-current can be set up to
a maximum of 300mA.
●Features
1) This product can drive a maximum of 300mA.
2) When the strobe terminal is controlled by the drive timing pulse, current during a period without driving can be reduced.
3) When the data output terminal is used as the next input data, cascade connection becomes possible.
4) Digital ground and power ground are separated.
5) Latch is built in between the shift register and the driver output.
6) Stand-by function is incorporated. (10μA Typ. upon standby)
●Applications
For AV equipment such as, component stereo sets, videos and TV sets, PCs, and control microcontroller mounted equipment.
●Absolute maximum ratings ●Thermal derating curve
Parameter Symbol Limit Unit
1600
1400
Power supply voltage VDD -0.3 to +7.0 V
Power dissipation Pd 1100* mW
Input voltage ISINK -0.3 to VCC V
Output voltage VO 15 V
Operating temperature Topr -25 to +70 ℃
Storage temperature Tstg -55 to +125 ℃
*1 Reduced by 11 mW/C over 25C.
1200
1000
800
600
400
Power dissipation Pd 〔mW〕
200
0
70℃
50 75 25 100 125 150 175
Ambient temperature Ta 〔℃〕
BA829
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© 2009 ROHM Co., Ltd. All rights reserved.
1/7
2009.06 - Rev.A
BA829
Technical Note
●Recommended operating conditions (Topr=-25℃ to +70℃)
Parameter
Symbol Min. Typ. Max. Unit Condition
Power supply VCC 4.5 5.0 5.5 V Clock frequency TCLK - - 500 kHz Power setup time tPset 500 - - ns Fig.4
Clock pulse width tWC 1 - - ns Fig.4
Data setup time tDset 300 - - ns Fig.4
Data hold time tDhold 400 - - ns Fig.4
Latch pulse timing 1 tLT1 600 - - ns Fig.4
Latch pulse timing 2 tLT2 250 - - ns Fig.4
Latch pulse width tWL 800 - - ns Fig.4
Strobe pulse timing 1 tST1 300 - - ns Fig.4
Strobe pulse width tws 3 - - μs Fig.4
Voltage between L-GND and P-GND VG - - 0.2 V -
* Electric potential is a difference of L-GND and P-GND. Short-circuit near the power source whenever possible.
However, between L-GND Pin and P-GND Pin, product should be used in a range not exceeding 0.2V.
●Electrical characteristics (Unless otherwise specified, Ta=25℃,VCC=5.0V)
Parameter Symbol Min. Typ. Max. Unit Condition Test Circuit
Supply current 1 Icc1 － 10 20 μA PSW“L” Fig.1
Supply current 2 Icc2 － 110 158 mA PSW“H”, STB“H” Fig.1
Supply current 3 Icc3 － 14 20 mA PSW“H”, STB“L” Fig.1
Output ON voltage VOON － 0.4 0.6 V ICCN=300 mA Fig.1
Output leakage current IOOFF － 10 50 μA V0=13.5V Fig.1
Data transference time fCLK 500 － － kHz － Fig.1
Input high-level voltage VIH 2.6 － － V － Fig.2
Input low-level voltage VIL － － 0.8 V － Fig.2
1=3.4V,CLK,LATCH
Input high-level current IIH1 － 0.1 10 μA
Input low-level current IIL1 － -0.01 -0.1 mA
V
,DATA,STB
1=0.4V,CLK,LATCH
V
,DATA,STB
Fig.1
Fig.1
Out put high-level voltage VDDH 2.8 3.0 － V IDOH=-400μA Fig.1
Output low-level voltage VDDL － 0.3 0.4 V IDOL=⊿1.6mA Fig.1
Data output transmission delay tDLH － 0.6 1.0 μs RLD=10kΩ Fig.4
Data output transmission delay tDHL － 0.6 2.0 μs RLD=10kΩ Fig.4
R
Print output transmission delay tOLH － － 10 μs
Print output transmission delay tOHL － － 10 μs
L=560kΩ560,
V
0=13.5V
L=560kΩ560,
R
0=13.5V
V
Fig.4
Fig.4
Input high-level current IIH2 － 0.04 0.1 mA V1=3.4V,PSW Fig.1
Input low-level current IIL2 － 0.1 10 μA V1=0.4V,PSW Fig.1
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© 2009 ROHM Co., Ltd. All rights reserved.
2/7
2009.06 - Rev.A
BA829
●Block diagram
Pulse Gen.
Technical Note
×8
DOFF
V
LD
STB
PSW
PAW
L
R
PGND
Fig.1
Fig.2
A
08
PGND
LGND Vcc
LGND V
V
A
V
OON
V
01
A
I
CC1～3
V
CC
CC
V
CC
O
W
V
DCH
V
V
DCL
CLK
R
Do
CLK
DATA
LATCH
DATA
LATCH
STB
A
I
IIH IIIL
VI
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© 2009 ROHM Co., Ltd. All rights reserved.
3/7
2009.06 - Rev.A
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