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?) 1 15 2 3 13 4 14 s d i c 12 11 10 9 8 7 6 5 o 0 o 1 o 2 o 3 o 4 o 5 o 6 o 7 16 v cc gnd 1 gnd 2 gnd (dig) dq c dq c dq c dq c dq c dq c dq c dq c 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 o 0 to o 7 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 : i out (ma) supply voltage : v cc (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?, v cc = + 5.0v) parameter symbol min. typ. max. unit conditions measurement circuit v cc 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 m 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 m s t 3 1 m 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 = 10k w v ih = 2.0v, v il = 0.8v v ih = 2.0v, v il = 0.8v v ih = 2.0v, v il = 0.8v v ih = 2.0v, v il = 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 o 7 pins, i o = 10 m a when i o = 100ma sink applied voltage v = 11.8v
3 standard ics ba823 / BA823F measurement circuits v cc = 5.0v pg 1 1 3 2 2 sw 2 sw 1 v in = 4.5v ba823 / f a a data should be left at "0" after 8 or more pulses have elapsed fig. 2 i cc and i ih measurement circuit v cc = 5.0v 1 2 sw 1 sw 3 sw 2 100ma 82 w v a i o 2 1 8 7 6 54 3 2 1 ba823 / f pg a after 8 or more pulses have elapsed fig. 3 v o on , v o off and i ol measurement circuit item i cc 11 i ih 21 ~ 3 sw 1 sw 2 item v o on 11 ~ 81 i ol 11 ~ 82 v o off 21 ~ 82 sw 1 sw 2 sw 3 when tested at v o off : i o = 10 m a when tested at i o on : v a = 30v input conditions t 1 t 2 t 3 fig. 4 data input d 1 shift pulse c print pulse s
4 standard ics ba823 / BA823F input / output circuits 1, 2, 15pin 10k w 20k w (a) input circuit 10k w 5k w 100 w 500 w 3pin v cc 200 w (c) data output circuit fig.5 12k w 1.0k w 5.5k w v cc 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 : i om (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 v cc gnd 1 gnd 2 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 o 3 output circuit gnd o 4 to o 7 output circuit gnd logic circuit gnd
6 standard ics ba823 / BA823F timing chart o 0 o 1 o 2 o 3 o 4 o 5 o 6 o 7 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 d i c v cc gnd1 gnd2 s d o o 7 10v ba823 / f d i c v cc gnd1 gnd2 s d o o 7 ba823 / f o 0 o 1 o 2 o 3 o 4 o 5 o 6 o 0 d i c v cc gnd1 gnd2 s d o o 1 o 2 o 3 o 4 o 5 o 6 o 7 o 0 o 1 o 2 o 3 o 4 o 5 o 6 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 o 7 , 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 out- put pins can be increased by eight bits each. external dimensions (units: mm) sop16 0.51min. 0.3 0.1 9 16 8 1 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 0.1 1.27 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
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