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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 head drivers Thermal printing
LED character display drivers
*Features up to 200 mA. 1) Can drive
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.
*Block diagram
O0 12 O1 11 O2 10 O3 9 O4 8 O5 7 O6 6 O7 5 16 VCC STROBE INPUT S 1 DQ C SHIFT PULSE C 2 DQ C DQ C DQ C DQ C DQ C DQ C DQ C 3 DATA OUTPUT Do
DATA INPUT DI 15
13 GND1 4 GND2
14 GND (Dig)
*Absolute maximum ratings (Ta = 25C)
Parameter Power supply voltage BA823 Power dissipation Input voltage Operating temperature Storage temperature BA823F Symbol VCC Pd VIN Max. Topr Tstg Limits 7.01 5502 5003 + 0.3 ~ + 6.0 - 20 ~ + 75 - 55 ~ + 125 Unit V mW V C C
1 O0 to O7 output pins are 34V (max.). 2 Reduced by 5.5mW for each increase in Ta of 1C over 25C. 3 Reduced by 5mW for each increase in Ta of 1C over 25C. 1
Standard ICs
BA823 / BA823F
*Usage conditions range
OUTPUT CURRENT : IOUT (mA) 200
100
Ma
x.
us
ag
ec
on
dit
ion
s
Usage conditions 0 range 0 10
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.
20
SUPPLY VOLTAGE : VCC (V)
Fig. 1 Power supply voltage and output current usage conditions
*Electrical characteristics (unless otherwise noted, Ta = 25C, VCC = + 5.0V)
Parameter 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 Symbol VCC IQ1 IQ2 VIL VIH IIH IIH VO OFF VO ON IOL VDOH VDOL t1 t2 t3 fMax. 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 A V V mA V V ns s s kHz VIN = 4.5 V VIN = 2.0 V O0 to O7 pins, IO = 10A When IO = 100mA sink Applied voltage V = 11.8V RL = 10k -- VIH = 2.0V, VIL = 0.8V VIH = 2.0V, VIL = 0.8V VIH = 2.0V, VIL = 0.8V VIH = 2.0V, VIL = 0.8V VCC pin When all data values are "0" When all data values are "0" -- -- Conditions Measurement circuit Fig.2 Fig.2 Fig.2 Fig.2 Fig.2 Fig.2 Fig.2 Fig.3 Fig.3 Fig.3 Fig.3 Fig.3 -- -- -- --
2
Standard ICs
BA823 / BA823F
*Measurement circuits
VCC = 5.0V A
Item
Data should be left at "0" VIN = 4.5V
SW1 1 2
SW2 1 1~3
ICC IIH
A
BA823 / F
3 2 SW2 1 2 1 PG SW1 After 8 or more pulses have elapsed
Fig. 2 ICC and IIH measurement circuit
Item
VCC = 5.0V
SW1 1 1
SW2 1~8 1~8 1~8
SW3 1 2 2
VO IOL VO
BA823 / F
ON
OFF
2
When tested at VO OFF : IO = 10A When tested at IO ON : VA = 30V
1 2 SW1 7 8
5 6
4 3
SW2 SW3 2 A IO
2
1
PG 1 After 8 or more pulses have elapsed 100mA
82 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 5.5k 20k 1, 2, 15pin 10k
5, 6, 7, 8, 9, 10, 11, 12pin 1.0k 48mA 42mA 22mA 18mA 100 12k
(c) Data output circuit
VCC 100 500 10k 200
3pin
5k
Fig.5
*Electrical characteristic curves
750 MAXIMUM OUTPUT CURENT : IOM (mA) POWER DISSIPATION : Pd (mW) BA823 500 BA823F
200
13%
30%
160 15% 120 Ta = 75C 80 BA823F 40 34%
Ta = 25C BA823
250
0 - 25
0
25
50
75
100
125
150
20
40
60
80
AMBIENT TEMPERATURE : Ta (C)
OUTPUT DUTY CYCLE (ALL BIT "ON") (%)
At repetition frequency of 1 Hz or higher
Fig. 6 Power dissipation vs. ambient temperature
Fig. 7 Output conditions
4
Standard ICs
BA823 / BA823F
*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 VCC GND GND GND Code C DI S O0 O1 O2 O3 O4 O5 O6 O7 DO VCC GND1 GND2 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 O7 output circuit and becomes the input for the next step Normally 5.0V used (10%) O0 to O3 output circuit GND O4 to O7 output circuit GND Function
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
10V
O0
O1
O2
O3
O4
O5
O6
O7
O0
O1
O2
O3
O4
O5
O6
O7
O0
O1
O2
O3
O4
O5
O6
BA823 / F
GND1 GND2 VCC DO DI DI C C S
BA823 / F
GND1 GND2 VCC DO DI C S
BA823 / F
GND1 GND2 VCC DO
0.15 0.1 0.3Min. 0.15
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
current) of the heat element does not need to be switched.
*Circuit operation internal configuration shown in the The BA823 has 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
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
19.4 0.3 16 9 6.5 0.3 16 6.2 0.3 4.4 0.2 9
BA823F
10.0 0.2
0.51Min.
1
8 7.62
3.2 0.2 4.25 0.3
1 1.5 0.1
8
0.11
0.3 0.1
1.27
2.54
0.5 0.1
0.4 0.1
0 ~ 15
DIP16
SOP16
S
O7
7

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