Datasheet BA823F, BA823 Datasheet (ROHM)

1

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

•

Features

•

Block diagram

•

Absolute maximum ratings (Ta = 25°C)

1

15

2

3

13

4

14

S

D

I

C

12 11 10 9 8 7 6

5

O

0 O1 O2 O3 O4 O5 O6 O7

16

V

CC

GND1
GND2
GND

(Dig)

DQCDQCDQCDQCDQ

CDQCDQCDQC

STROBE INPUT

DATA INPUT

SHIFT PULSE

DATA OUTPUT Do

1) Can drive up to 200 mA.

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.

4) The digital ground and power ground are separated.

5) TTL and CMOS drive possible.

Parameter Symbol Limits Unit

V

CC 7.0

∗

1

V

BA823

Pd

550

∗

2

mW

BA823F 500

∗

3

V

IN Max. + 0.3 ~ + 6.0 V

Topr – 20 ~ + 75 °C
Tstg – 55 ~ + 125 °C

Power supply voltage

Power dissipation

Input voltage
Operating temperature
Storage temperature

∗

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.

2

Standard ICs BA823 / BA823F

•

Usage conditions range

200

100

0

01020

OUTPUT CURRENT : IOUT (mA)

SUPPLY VOLTAGE : VCC (V)

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.

Fig. 1 Power supply voltage and

output current usage conditions

Max. usage conditions

Usage conditions
range

•

Electrical characteristics (unless otherwise noted, Ta = 25°C, VCC = + 5.0V)

Parameter Symbol Min. Typ. Max. Unit Conditions

Measurement

circuit

VCC 4.5 5.0 5.5 V Fig.2

I

Q1 — 4 6 mA Fig.2

I

Q2 — 8 11 mA Fig.2

V

IL ——0.8 V Fig.2

V

IH 2 ——V Fig.2

I

IH ——0.4 mA Fig.2

I

IH ——100 µ

A Fig.2

V

O OFF ——21.8 V Fig.3

V

O ON — 0.8 1.3 V Fig.3

I

OL ——207 mA Fig.3

V

DOH

2.4

——V

Fig.3

V

DOL ——0.8 V Fig.3

t

1 ——300 ns

—

t

2 —— 1 µ

s

—

t

3 —— 1 µ

s

—

f

Max. 500 ——kHz

—

Power supply voltage
Quiescent current 1
Quiescent current 2
Input low level voltage
Input high level voltage
Input high level current
Input high level current
Maximum output voltage
Output saturation voltage
Output current
"H" level data output voltage
"L" level data output voltage
Minimum setup time
Minimum shift pulse width
Minimum timing time
Maximum data transfer speed

—
—

R

L

= 10kΩ

—

V

IH

= 2.0V, VIL = 0.8V

V

IH

= 2.0V, VIL = 0.8V

V

IH

= 2.0V, VIL = 0.8V

V

IH

= 2.0V, VIL = 0.8V

V

CC pin

When all data values are "0"
When all data values are "0"

V

IN = 4.5 V

V

IN = 2.0 V

O

0 to O7 pins, IO = 10µA

When I

O = 100mA sink

Applied voltage V = 11.8V

3

Standard ICs BA823 / BA823F

•

Measurement circuits

VCC = 5.0V

PG

1

1

3

2

2

SW

2

SW1

VIN = 4.5V

BA823 / F

A

A

Data should be left at "0"

After 8 or more pulses have elapsed

Fig. 2 ICC and IIH measurement circuit

VCC = 5.0V

1
2

SW

1

SW3

SW2

100mA

82Ω

V

A

IO

21

8

7

6

54

3

2

1

BA823 / F

PG

A

After 8 or more pulses have elapsed

Fig. 3 VO ON, VO OFF and IOL measurement circuit

Item

I

CC 11

I

IH 21 ~ 3

SW

1 SW2

Item

V

O ON 11 ~ 81

I

OL 11 ~ 82

V

O OFF 21 ~ 82

SW

1 SW2 SW3

When tested at VO OFF : IO = 10µA
When tested at I

O ON : VA = 30V

•

Input conditions

t1 t2

t3

Fig. 4

Data input

D

1

Shift pulse

C

Print pulse

S

4

Standard ICs BA823 / BA823F

•

Input / output circuits

1, 2, 15pin

10kΩ

20kΩ

(a) Input circuit

10kΩ

5kΩ

100Ω

500Ω

3pin

V

CC

200Ω

(c) Data output circuit

Fig.5

12kΩ

1.0kΩ

5.5kΩ

VCC

5, 6, 7, 8, 9, 10,
11, 12pin

(b) Output circuit

•

Electrical characteristic curves

AMBIENT TEMPERATURE : Ta (°C)

POWER DISSIPATION : Pd (mW)

750

500

250

0

– 25 0 25 50 75 100

BA823F

125 150

BA823

Fig. 6 Power dissipation vs.

ambient temperature

OUTPUT DUTY CYCLE (ALL BIT "ON") (%)

MAXIMUM OUTPUT CURENT : IOM (mA)

200

160

120

80

40

20 40 60 80 100

18mA

22mA

42mA

48mA

13% 30%

34%

15%

BA823

BA823F

Ta

=

75°C

Ta = 25°C

At repetition frequency of 1 Hz or higher

Fig. 7 Output conditions

5

Standard ICs BA823 / BA823F

•

Pin descriptions

C

S

O

0

O

1

O

2

O

3

O

4

O

5

O

6

O

7

D

O

VCC
GND1
GND2

D

I

GND (Dig)

2

15

1
12
11
10

9

8

7

6

5

3
16
13

4
14

Pin No.

SHIFT PULSE

DATA INPUT

STROBE
OUTPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT

DATA OUTPUT

V

CC

GND
GND
GND

Pin name Code

Function
Shift pulse of shift register
Data input of shift pulse registered using shift pulse rise
When "1", the content of the shift register is output
"0" when the content of the register is "1" on the 1st bit
"0" when the content of the register is "1" on the 2nd bit
"0" when the content of the register is "1" on the 3rd bit
"0" when the content of the register is "1" on the 4th bit
"0" when the content of the register is "1" on the 5th bit
"0" when the content of the register is "1" on the 6th bit
"0" when the content of the register is "1" on the 7th bit
"0" when the content of the register is "1" on the 8th bit
Has passed the O

7 output circuit and becomes the input for the next step

Normally 5.0V used (±10%)
O

0 to O3 output circuit GND

O

4 to O7 output circuit GND

Logic circuit GND

6

Standard ICs BA823 / BA823F

•

Timing chart

O0

O1

O2

O3

O4

O5

O6

O7

Fig.8

C

D

I

S

D

O

Clock input

Data input

Strobe input

Data output

7

Standard ICs BA823 / BA823F

•

Application example

BA823 / F

DICVCCGND1

GND2SD

O

O7

10V

BA823 / F

DICVCCGND1

GND2SD

O

O7

BA823 / F

O0O1O2O3O4O5O6

O0

DI

C

VCCGND1

GND2SD

O

O1O2O3O4O5O6O7

O0O1O2O3O4O5O6

Fig.9

Data signal

Shift pulse
Power supply

5V
Print pulse

Example of printing using a strobe pulse
This offers the advantage that the common line (large

current) of the heat element does not need to be
switched.

•

Circuit operation
The 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 O

0 to O7, as shown in the timing chart

in Figure 8, depending on the strobe input, with that

pulse width being the same as that of the strobe input.
The data output pin D

O 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 D

I. 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)

SOP16

0.51Min.

0.3

± 0.1

916

81

6.5 ± 0.3

3.2 ± 0.2

4.25 ± 0.3

0.5 ± 0.1

19.4 ± 0.3

2.54

0° ~ 15°

7.62

BA823 BA823F

DIP16

0.4 ± 0.11.27

0.15

0.15 ± 0.1

0.3Min.

4.4 ± 0.2

6.2 ± 0.3

0.11

1.5 ± 0.1

1

16

10.0 ± 0.2

8

9