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 Power dissipation BA823F Input voltage Operating temperature Storage temperature Symbol Vcc Pd VIN MAX Topr Tstg Limits 7.01 Unit V 3 mW 500 +0.3 to +6.0 -20 to +75 -55 to +125 V *1 Voltage of O0~O7 terminals is 34V (Max.) *2 Reduced by 5.5 mW/C over 25C. *3 Reduced by 5.0 mW/C over 25C. 875 750 Pd (mW) Parameter Power supply voltage Thermal derating curve Power dissipation Absolute maximum ratings (Ta=25) 625 BA823 500 BA823F 375 250 125 70 0 -25 0 25 50 75 100 125 Ambient temperature Ta () Fig.1 www.rohm.com (c) 2009 ROHM Co., Ltd. All rights reserved. 1/8 2009.06 - Rev.A 150 Technical Note 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 VCC IO1 IO2 VIL VIH IIL 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 Conditions VCC terminal @All outputs = "0" @All outputs = "0" VIN=4.5V VIN=2.0V 0 to 7, Io=10A @Io=100mA sink External voltage = 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 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 - OUTPUT CURRENT : IOUT (mA) Usage conditions range 200 100 Max usage conditions 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. Usage condition range 0 0 10 20 SUPPLY VOLTAGE : Vcc (V) Fig.2 Power supply voltage and current usage conditions www.rohm.com (c) 2009 ROHM Co., Ltd. All rights reserved. 2/8 2009.06 - Rev.A Technical Note BA823F Block diagram STROBE INPUT S 1 DATA INPUT D4 15 SHIFT PULSE C 0 1 2 3 4 5 6 12 11 10 9 8 7 6 2 7 5 16 VCC 3 DATA OUTPUT DO 13 GND1 4 GND2 14 GND (Dig) Pin descriptions Pin No. Pin Name Symbol Function 2 SHIFT PULSE C Shift pulse of shift register 15 DATA INPUT D1 Data input of shift register is stored during the shift pulse rise time. 1 STROBE S When "1" is effective, the content of shift register is outputted. 12 OUTPUT 0 "0" is effective when the content of register is "1" on the 1st bit is outputted. 11 OUTPUT 1 "0" is effective when the content of register is "1" on the 2nd bit is outputted. 10 OUTPUT 2 "0" is effective when the content of register is "1" on the 3rd bit is outputted. 9 OUTPUT 3 "0" is effective when the content of register is "1" on the 4th bit is outputted. 8 OUTPUT 4 "0" is effective when the content of register is "1" on the 5th bit is outputted. 7 OUTPUT 5 "0" is effective when the content of register is "1" on the 6tht bit is outputted. 6 OUTPUT 6 "0" is effective when the content of register is "1" on the 7tht bit is outputted. 5 OUTPUT 7 "0" is effective when the content of register is "1" on the 8th bit is outputted. 3 DATA OUTPUT Do Data having passed through the output circuit of 7 becomes the input of the next stage 16 VCC VCC 5.0V .is used normally (10%) 13 GND GND1 Especially, GND of the output circuit of 0~ 3 4 GND GND2 Especially, GND of the output circuit of 4~ 7 14 GND GND(Dig) Especially, GND of the logic circuit 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 0~ 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. www.rohm.com (c) 2009 ROHM Co., Ltd. All rights reserved. 3/8 2009.06 - Rev.A Technical Note BA823F Measurement circuits A Vcc=5.0V Item Data should be left "0". VIN=4.5V SW2 SW1 ICC 1 1 IIH 2 13 BA823F A 3 2 SW2 2 1 1 PG SW1 After 8 pulses have elapsed. Fig.3 Icc 1st measurement circuit VCC=5.0V BA823F 5 1 2 SW1 8 7 4 1 After 8 pulses have elapsed. SW2 SW3 1 18 1 IOL 1 18 1 VO OFF 2 18 2 2 SW2 PG SW1 VO ON IO = 10A when VO OFF is measured VA = 30V when IO ON is measured 3 6 Item 1 SW3 2 A IO 100mA 82 VA Fig.4 Vo ON, Vo OFF, IOL measurement circuit Input conditions Data input D1 Shift pulse C t1 t2 Print pulse S t3 Fig.5 www.rohm.com (c) 2009 ROHM Co., Ltd. All rights reserved. 4/8 2009.06 - Rev.A Technical Note BA823F Timing chart Clock input C DATA input D1 Strobe input S 0 1 2 3 4 5 6 7 DATA output DO Fig.6 Application example 7 6 5 4 3 2 1 0 7 6 5 DO S GND2 GND1 D1 DO S BA823F C VCC 4 GND2 GND1 C VCC D1 DO BA823F S GND2 GND1 C VCC D1 BA823F 3 2 1 0 7 6 5 4 3 2 1 0 10V 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. www.rohm.com (c) 2009 ROHM Co., Ltd. All rights reserved. Use for thermal printer (when the timing is 1 phase) example 5/8 2009.06 - Rev.A Technical Note BA823F Interfaces (a) Input (b) Output VCC 1,2,15pin 5.5k 10k 5,6,7,8,9,10,11,12pin 20k 12k (c) 1.0k Serial data output VCC 10k 100 200 500 3pin 5k Fig.8 MAXIMUM OUTPUT CURENT : low(mA) Thermal derating curve 13% 30% 200 160 15% 34% 120 Ta=75 Ta=25 BA823 80 40 48mA 42mA BA823F 0 0 20 40 60 80 22mA 18mA 100 OUTPUT DUTY CYCLE(ALL BIT "ON")(%) At repetition frequency 1Hz or higher Fig.9 Output conditions www.rohm.com (c) 2009 ROHM Co., Ltd. All rights reserved. 6/8 2009.06 - Rev.A Technical Note BA823F Notes for use 1. Absolute maximum ratings An excess in the absolute maximum ratings, such as supply voltage, temperature range of operating conditions, etc., can break down the devices, thus making impossible to identify breaking mode, such as a short circuit or an open circuit. If any over rated values will expect to exceed the absolute maximum ratings, consider adding circuit protection devices, such as fuses. 2. Connecting the power supply connector backward Connecting of the power supply in reverse polarity can damage IC. Take precautions when connecting the power supply lines. An external direction diode can be added. 3. Power supply lines Design PCB layout pattern to provide low impedance GND and supply lines. To obtain a low noise ground and supply line, separate the ground section and supply lines of the digital and analog blocks. Furthermore, for all power supply terminals to ICs, connect a capacitor between the power supply and the GND terminal. When applying electrolytic capacitors in the circuit, not that capacitance characteristic values are reduced at low temperatures. 4. GND voltage The potential of GND pin must be minimum potential in all operating conditions. 5. Inter-pin shorts and mounting errors Use caution when positioning the IC for mounting on printed circuit boards. The IC may be damaged if there is any connection error or if pins are shorted together. 6. Actions in strong electromagnetic field Use caution when using the IC in the presence of a strong electromagnetic field as doing so may cause the IC to malfunction. 7. Testing on application boards When testing the IC on an application board, connecting a capacitor to a pin with low impedance subjects the IC to stress. Always discharge capacitors after each process or step. Always turn the IC's power supply off before connecting it to or removing it from a jig or fixture during the inspection process. Ground the IC during assembly steps as an antistatic measure. Use similar precaution when transporting or storing the IC. 8. Regarding input pin of the IC This monolithic IC contains P+ isolation and P substrate layers between adjacent elements in order to keep them isolated. P-N junctions are formed at the intersection of these P layers with the N layers of other elements, creating a parasitic diode or transistor. For example, the relation between each potential is as follows: When GND > Pin A and GND > Pin B, the P-N junction operates as a parasitic diode. When GND > Pin B, the P-N junction operates as a parasitic transistor. Parasitic diodes can occur inevitable in the structure of the IC. The operation of parasitic diodes can result in mutual interference among circuits, operational faults, or physical damage. Accordingly, methods by which parasitic diodes operate, such as applying a voltage that is lower than the GND (P substrate) voltage to an input pin, should not be used. Resistor Transistor (NPN) Pin A Pin B C Pin B B E Pin A N P+ N P+ P N Parasitic element N P+ P substrate Parasitic element GND B N P+ P N C E Parasitic element P substrate Parasitic element GND GND GND Other adjacent elements Fig.10 Example of IC structure 9. Ground Wiring Pattern When using both small signal and large current GND patterns, it is recommended to isolate the two ground patterns, placing a single ground point at the ground potential of application so that the pattern wiring resistance and voltage variations caused by large currents do not cause variations in the small signal ground voltage. Be careful not to change the GND wiring pattern of any external components, either. www.rohm.com (c) 2009 ROHM Co., Ltd. All rights reserved. 7/8 2009.06 - Rev.A Technical Note BA823F Ordering part number B D 8 Part No. 2 3 Part No. F - Package F: SOP16 E 2 Packaging and forming specification E2: Embossed tape and reel SOP16 <Tape and Reel information> 10 0.2 (MAX 10.35 include BURR) 9 Tape Embossed carrier tape Quantity 2500pcs Direction of feed E2 The direction is the 1pin of product is at the upper left when you hold ( reel on the left hand and you pull out the tape on the right hand ) 0.3MIN 4.40.2 6.20.3 16 1 8 0.11 1.50.1 0.15 0.1 1.27 0.4 0.1 0.1 1pin Reel (Unit : mm) www.rohm.com (c) 2009 ROHM Co., Ltd. All rights reserved. 8/8 Direction of feed Order quantity needs to be multiple of the minimum quantity. 2009.06 - Rev.A Notice Notes No copying or reproduction of this document, in part or in whole, is permitted without the consent of ROHM Co.,Ltd. The content specified herein is subject to change for improvement without notice. The content specified herein is for the purpose of introducing ROHM's products (hereinafter "Products"). If you wish to use any such Product, please be sure to refer to the specifications, which can be obtained from ROHM upon request. Examples of application circuits, circuit constants and any other information contained herein illustrate the standard usage and operations of the Products. The peripheral conditions must be taken into account when designing circuits for mass production. Great care was taken in ensuring the accuracy of the information specified in this document. However, should you incur any damage arising from any inaccuracy or misprint of such information, ROHM shall bear no responsibility for such damage. The technical information specified herein is intended only to show the typical functions of and examples of application circuits for the Products. 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If a Product is intended to be used for any such special purpose, please contact a ROHM sales representative before purchasing. If you intend to export or ship overseas any Product or technology specified herein that may be controlled under the Foreign Exchange and the Foreign Trade Law, you will be required to obtain a license or permit under the Law. Thank you for your accessing to ROHM product informations. More detail product informations and catalogs are available, please contact us. ROHM Customer Support System http://www.rohm.com/contact/ www.rohm.com (c) 2009 ROHM Co., Ltd. All rights reserved. R0039A