Rohm BA823 8-bit, serial in, parallel out driver Datasheet

Standard ICs
8-bit, serial IN, parallel OUT driver
BA823 / BA823F
The BA823 and BA823F are 8-bit serial input, parallel output drivers. These monolithic ICs were developed as
drivers for thermal printing heads, LED character displays, and other similar applications.
Applications
•Thermal
printing head drivers
LED character display drivers
•1)Features
Can drive up to 200 mA.
4) The digital ground and power ground are separated.
5) TTL and CMOS drive possible.
2) Controlling the strobe terminal with the drive timing
pulse enables current to be reduced when drive is
not being carried out.
3) Using the data output terminal for the next data input
enables cascade connections.
•Block diagram
O0
O1
O2
O3
O4
O5
O6
O7
12
11
10
9
8
7
6
5
16 VCC
STROBE INPUT S
1
DATA INPUT DI 15
D Q
D Q
D Q
D Q
D Q
D Q
D Q
D Q
C
C
C
C
C
C
C
C
3
4
SHIFT PULSE C 2
DATA OUTPUT Do
13 GND1
GND2
14 GND
(Dig)
•Absolute maximum ratings (Ta = 25°C)
Parameter
Power supply voltage
BA823
Power dissipation
BA823F
Symbol
Limits
7.0∗1
VCC
550∗2
Pd
500∗3
Unit
V
mW
VIN Max.
+ 0.3 ~ + 6.0
V
Operating temperature
Topr
– 20 ~ + 75
°C
Storage temperature
Tstg
– 55 ~ + 125
°C
Input voltage
∗1 O0 to O7 output pins are 34V (max.).
∗2 Reduced by 5.5mW for each increase in Ta of 1°C over 25°C.
∗3 Reduced by 5mW for each increase in Ta of 1°C over 25°C.
1
Standard ICs
BA823 / BA823F
OUTPUT CURRENT : IOUT (mA)
•Usage conditions range
200
Ma
100
x.
us
Fig. 1 Power supply voltage and output current
usage conditions (Per Circuit)
The maximum usage conditions, shown on the
left, indicate the absolute maximums for power
supply voltage and IC output current. Never
exceed these usage conditions, under any
circumstances.
ag
ec
on
Usage conditions
0 range
0
10
dit
ion
s
20
SUPPLY VOLTAGE : VCC (V)
Fig. 1 Power supply voltage and
output current usage conditions
•Electrical characteristics (unless otherwise noted, Ta = 25°C, V
CC
Parameter
Symbol
Min.
Typ.
Max.
Unit
Power supply voltage
VCC
4.5
5.0
5.5
V
Quiescent current 1
IQ1
—
4
6
Quiescent current 2
IQ2
—
8
11
Input low level voltage
VIL
—
—
Input high level voltage
VIH
2
—
Input high level current
IIH
—
—
Conditions
Measurement
circuit
VCC pin
Fig.2
mA
When all data values are "0"
Fig.2
mA
When all data values are "0"
Fig.2
0.8
V
—
Fig.2
—
V
—
Fig.2
0.4
mA
VIN = 4.5 V
Fig.2
IIH
—
—
100
µA
VIN = 2.0 V
Fig.2
Maximum output voltage
VO OFF
—
—
21.8
V
O0 to O7 pins, IO = 10µA
Fig.3
Output saturation voltage
VO ON
—
0.8
1.3
V
When IO = 100mA sink
Fig.3
IOL
—
—
207
mA
Applied voltage V = 11.8V
Fig.3
"H" level data output voltage
VDOH
2.4
—
—
V
RL = 10kΩ
Fig.3
"L" level data output voltage
VDOL
—
—
0.8
V
Minimum setup time
t1
—
—
300
ns
VIH = 2.0V, VIL = 0.8V
—
Minimum shift pulse width
t2
—
—
1
µs
VIH = 2.0V, VIL = 0.8V
—
Input high level current
Output current
Minimum timing time
Maximum data transfer speed
2
= + 5.0V)
—
Fig.3
t3
—
—
1
µs
VIH = 2.0V, VIL = 0.8V
—
fMax.
500
—
—
kHz
VIH = 2.0V, VIL = 0.8V
—
Standard ICs
BA823 / BA823F
•Measurement circuits
A
VCC = 5.0V
Data should be left at "0"
Item
SW1
SW2
ICC
1
1
IIH
2
1~3
VIN = 4.5V
BA823 / F
A
3
2
SW2
2
1
1
PG
SW1
After 8 or more pulses have elapsed
Fig. 2 ICC and IIH measurement circuit
Item
SW1
SW2
SW3
1
1~8
1
1
1~8
2
2
1~8
2
VCC = 5.0V
VO
ON
IOL
VO
OFF
When tested at VO OFF : IO = 10µA
BA823 / F
When tested at IO ON : VA = 30V
5
1
2
4
3
6
7
SW1
8
SW2
PG
1
After 8 or more pulses have elapsed
100mA
2
1
SW3
2
A
IO
82Ω
VA
Fig. 3 VO ON, VO OFF and IOL measurement circuit
•Input conditions
Data input
D1
Shift pulse
C
t1 t2
Print pulse
S
t3
Fig. 4
3
Standard ICs
BA823 / BA823F
•Input / output circuits
(a) Input circuit
(b) Output circuit
VCC
5.5kΩ
1, 2, 15pin
20kΩ
10kΩ
12kΩ
1.0kΩ
5, 6, 7, 8, 9, 10,
11, 12pin
(c) Data output circuit
10kΩ
100Ω
VCC
200Ω
500Ω
5kΩ
3pin
Fig.5
200
MAXIMUM OUTPUT CURENT : IOM (mA)
POWER DISSIPATION : Pd (mW)
•Electrical characteristic curves
750
BA823
500
BA823F
250
0
– 25
0
25
50
75
100
125
AMBIENT TEMPERATURE : Ta (°C)
150
13%
30%
160
15%
34%
120
Ta = 25°C
Ta = 75°C
BA823
80
BA823F
48mA
42mA
40
20
40
60
80
22mA
18mA
100
OUTPUT DUTY CYCLE (ALL BIT "ON") (%)
At repetition frequency of 1 Hz or higher
Fig. 6 Power dissipation vs.
ambient temperature
4
Fig. 7 Output conditions
Standard ICs
BA823 / BA823F
•Pin descriptions
Pin No.
Pin name
Code
Function
2
SHIFT PULSE
C
Shift pulse of shift register
15
DATA INPUT
DI
Data input of shift pulse registered using shift pulse rise
1
STROBE
S
When "1", the content of the shift register is output
12
OUTPUT
O0
"0" when the content of the register is "1" on the 1st bit
11
OUTPUT
O1
"0" when the content of the register is "1" on the 2nd bit
10
OUTPUT
O2
"0" when the content of the register is "1" on the 3rd bit
9
OUTPUT
O3
"0" when the content of the register is "1" on the 4th bit
8
OUTPUT
O4
"0" when the content of the register is "1" on the 5th bit
7
OUTPUT
O5
"0" when the content of the register is "1" on the 6th bit
6
OUTPUT
O6
"0" when the content of the register is "1" on the 7th bit
5
OUTPUT
O7
"0" when the content of the register is "1" on the 8th bit
3
DATA OUTPUT
DO
Has passed the O7 output circuit and becomes the input for the next step
16
VCC
VCC
Normally 5.0V used (±10%)
13
GND
GND1
O0 to O3 output circuit GND
4
GND
GND2
O4 to O7 output circuit GND
14
GND
GND (Dig) Logic circuit GND
5
Standard ICs
BA823 / BA823F
•Timing chart
Clock input
C
Data input
DI
Strobe input
S
O0
O1
O2
O3
O4
O5
O6
O7
Data output
DO
Fig.8
6
Standard ICs
BA823 / BA823F
•Application example
O7
O6
O5
O4
O3
O2
O1
O0
O7
O6
O5
DO
S
GND2
GND1
C
DI
S
DO
BA823 / F
VCC
O4
GND2
GND1
VCC
C
DI
DO
BA823 / F
S
GND2
GND1
VCC
C
DI
BA823 / F
O3
O2
O1
O0
O7
O6
O5
O4
O3
O2
O1
O0
10V
Data signal
Shift pulse
Power supply
5V
Print pulse
Fig.9
Example of printing using a strobe pulse
This offers the advantage that the common line (large
operation
•TheCircuit
BA823 has the internal configuration shown in the
logic diagram, with the following three input pins: clock
C, data DI, and strobe S. Data input is synchronized to
the clock, with data being read serially at the rising
edge. The content of the set shift register appears at
output terminals O0 to O7, as shown in the timing chart
in Figure 8, depending on the strobe input, with that
current) of the heat element does not need to be
switched.
pulse width being the same as that of the strobe input.
The data output pin DO is used when ICs are connected
in cascade format, and when the output for the last
stage of the shift register appears, is connected to the
next data input pin DI. When these clock and strobe
latches and power switch are used in common, the output pins can be increased by eight bits each.
•External dimensions (Units: mm)
BA823
BA823F
10.0 ± 0.2
19.4 ± 0.3
9
0.3 ± 0.1
0.5 ± 0.1
0.11
7.62
2.54
9
1
8
1.27
0.4 ± 0.1
0.15 ± 0.1
8
16
4.4 ± 0.2
6.2 ± 0.3
1
1.5 ± 0.1
0.51Min.
3.2 ± 0.2 4.25 ± 0.3
6.5 ± 0.3
16
0.3Min.
0° ~ 15°
0.15
DIP16
SOP16
7
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