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