Serial-in / Parallel-out Driver Series
Serial-Parallel
3-input Driver
BA823F
No.09051EAT01
●Description
BA823F are an 8-bit serial-to-parallel-output driver, applicable for thermal printer heads or LED character display drivers.
●Features
1) Capable of driving a maximum of 200mA.
2) Non-driving current consumption can be reduced by controlling the strobe timing pulse.
3) Output data terminal can be used for a cascade configuration.
4) Digital ground and power ground are separated.
5) TTL and CMOS allow driving.
●Applications
Driver for thermal print head
Driver for LED character display
●Absolute
maximum ratings (Ta=25℃)
Parameter
Power supply voltage
Power
dissipation
BA823F
Symbol
Vcc
Pd
V
IN MAX
Topr
Tstg
Limits
7.0
＊
1
500
＊
3
+0.3 to +6.0
-20 to +75
-55 to +125
Unit
V
mW
V
℃
℃
●Thermal
derating curve
875
750
Power dissipation Pd (mW)
625
500
375
250
125
0
-25
0
25
50
75
100 125
Ambient temperature Ta (℃)
150
BA823
BA823F
Input voltage
Operating temperature
Storage temperature
*1 Voltage of O
0
~O
7
terminals is 34V (Max.)
*2 Reduced by 5.5 mW/C over 25C.
*3 Reduced by 5.0 mW/C over 25C.
70℃
Fig.1
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© 2009 ROHM Co., Ltd. All rights reserved.
1/8
2009.06 - Rev.A
BA823F
●Electrical
characteristics
(Unless otherwise specified, Ta=25℃,Vcc=+5.0V)
Parameter
Power supply
Current dissipation(no load)1
Current dissipation(no load)2
Input low level voltage
Input high level voltage
Input low level current
Input high level current
Maximum output voltage
Output saturation voltage
Output current
“H” output voltage
“L” output voltage
Minimum set up time
Minimum shift clock width
Minimum timing pulse width
Maximum transfer time
Symbol
V
CC
I
O1
I
O2
V
IL
V
IH
I
IL
I
IH
V
O OFF
V
O ON
I
OL
V
DOH
V
DOL
t
1
T
2
T
3
f
Max
Min.
4.5
-
-
-
2
-
-
-
-
-
2.4
-
-
-
-
500
Typ.
5.0
4
8
-
-
-
-
-
0.8
-
-
-
-
-
-
-
Max.
5.5
6
11
0.8
-
0.4
100
21.8
1.3
207
-
0.8
300
1
1
-
Unit
V
mA
mA
V
V
mA
μA
V
V
mA
V
V
ns
μs
μs
kHz
Technical Note
Conditions
V
CC
terminal
@All outputs = “0”
@All outputs = “0”
-
-
V
IN
=4.5V
V
IN
=2.0V
Ō
0
to
Ō
7,
Io=10μA
@Io=100mA sink
External voltage = 11.8V
R
L
=10kΩ
-
V
IH
=2.0V,V
IL
=0.8V
V
IH
=2.0V,V
IL
=0.8V
V
IH
=2.0V,V
IL
=0.8V
V
IH
=2.0V,V
IL
=0.8V
Test Circuit
Fig.2
Fig.2
Fig.2
Fig.2
Fig.2
Fig.2
Fig.3
Fig.3
Fig.3
Fig.3
Fig.3
Fig.3
-
-
-
-
●Usage
conditions range
OUTPUT CURRENT : I
OUT
(mA)
200
100
Max usage conditions
Usage condition
range
0
10
20
Fig.2: Conditions to use supply voltage and output current (per circuit)
Maximum conditions of use in the diagram to the left, show the
absolute maximum supply voltage and IC output current.
This product should not exceed the usage conditions range.
0
SUPPLY VOLTAGE : Vcc (V)
Fig.2 Power supply voltage and
current usage conditions
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2/8
2009.06 - Rev.A
BA823F
●Block
diagram
Ō
0
12
Technical Note
Ō
1
11
Ō
2
10
Ō
3
9
Ō
4
8
Ō
5
7
Ō
6
6
Ō
7
5
16
V
CC
STROBE INPUT S
DATA INPUT D
4
SHIFT PULSE C
1
15
3
13
2
4
14
DATA OUTPUT D
O
GND
1
GND
2
GND
(Dig)
●Pin
descriptions
Pin No.
2
15
1
12
11
10
9
8
7
6
5
3
16
13
4
14
Pin Name
SHIFT PULSE
DATA INPUT
STROBE
OUTPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
DATA OUTPUT
V
CC
GND
GND
GND
Symbol
C
D
1
S
Ō
0
Ō
1
Ō
2
Ō
3
Ō
4
Ō
5
Ō
6
Ō
7
Do
V
CC
GND
1
GND
2
GND(Dig)
Shift pulse of shift register
Data input of shift register is stored during the shift pulse rise time.
When “1” is effective, the content of shift register is outputted.
“0” is effective when the content of register is “1” on the 1st bit is outputted.
“0” is effective when the content of register is “1” on the 2nd bit is outputted.
“0” is effective when the content of register is “1” on the 3rd bit is outputted.
“0” is effective when the content of register is “1” on the 4th bit is outputted.
“0” is effective when the content of register is “1” on the 5th bit is outputted.
“0” is effective when the content of register is “1” on the 6tht bit is outputted.
“0” is effective when the content of register is “1” on the 7tht bit is outputted.
“0” is effective when the content of register is “1” on the 8th bit is outputted.
Data having passed through the output circuit of
Ō
7
becomes the input of the next stage
5.0V .is used normally (±10%)
Especially, GND of the output circuit of
Ō
0
~
Ō
3
Especially, GND of the output circuit of
Ō
4
~
Ō
7
Especially, GND of the logic circuit
Function
●Description
of operation
BA823 is configured internally as shown in the block diagram. Terminals of clock C, data D1, and strobe S are used as input.
Data input is synchronized with the clock, read serially during the rise time and latched at the rise time edge of the shifted
shift register. The content of the set shift register appears on the output terminal of
Ō
0
~
Ō
7
when the strobe is input, as
shown in the time chart of Fig.5. Pulse width is the same as that of the strobe input pulse.
Data output terminal D0, is a terminal used for cascade connection of the IC, where the output of the final stage of the shift
register has appeared, and is connected to the next data input terminal D1. In this case, when the clock and the strobe are
used in conjunction, output terminal can be increased by 8 bits at a time.
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3/8
2009.06 - Rev.A
BA823F
●Measurement
circuits
Technical Note
Vcc=5.0V
A
Data should be left “0”.
Item
I
CC
I
IH
BA823F
SW
1
1
2
SW
2
1
1½3
V
IN
=4.5V
A
3
2
SW
2
1
2
1
PG
After 8 pulses have elapsed.
SW
1
Fig.3 Icc 1st measurement circuit
V
CC
=5.0V
Item
V
O ON
I
OL
BA823F
5
1
2
SW
1
8
7
6
SW
2
SW
3
2
A
I
O
82Ω
V
A
4
SW
1
1
1
2
SW
2
1½8
1½8
1½8
SW
3
1
1
2
V
O OFF
3
2
1
IO = 10μA when VO OFF is measured
VA = 30V when IO ON is measured
PG
After 8 pulses have elapsed.
100mA
1
Fig.4 Vo
ON
, Vo
OFF
, I
OL
measurement circuit
●Input
conditions
Data input
D
1
Shift pulse
C
t
1
t
2
Print pulse
S
t
3
Fig.5
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© 2009 ROHM Co., Ltd. All rights reserved.
4/8
2009.06 - Rev.A
BA823F
●Timing
chart
Clock input
DATA input
Strobe input
C
D
1
S
Technical Note
Ō
0
Ō
1
Ō
2
Ō
3
Ō
4
Ō
5
Ō
6
Ō
7
DATA output
D
O
Fig.6
●Application
example
10V
Ō
0
Ō
1
Ō
2
Ō
3
Ō
4
Ō
5
Ō
6
Ō
7
Ō
0
Ō
1
Ō
2
Ō
3
Ō
4
Ō
5
Ō
6
Ō
7
Ō
0
Ō
1
Ō
2
Ō
3
Ō
4
Ō
5
Ō
6
BA823F
GND1
GND2
C
V
CC
D
O
D
1
D
1
S
BA823F
GND1
GND2
C
V
CC
D
O
D
1
S
BA823F
GND1
C
V
CC
GND2
D
O
S
DATA signal
Shift pulse
Power supply 5V
Print pulse
Fig.7
Example: Print head using the strobe function
Disabling the high current while the heating
element is switched off is advantageous.
Use for thermal printer (when the timing is 1 phase) example
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Ō
7
5/8
2009.06 - Rev.A
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