1 standard ics 8-bit static shift register bu4021b / bu4021bf the bu4021b and bu4021bf are 8-bit static shift registers consisting of 8 register cells, each of which has parallel input. control of the parallel / serial control input (p / s) enables serial input / serial output with clock synchronization, as well as parallel input / serial output conversions. logic circuit diagram truth table serial operation d ds (11) p / s (9) clock (10) q c dq c dq c dq c dq c dq q c dq q c d q c (2) q 6 p 8 (1) p 7 (15) p 6 (14) p 5 (13) p 4 (4) p 3 (5) p 2 (6) p 1 (7) (12) q 7 (3) q 8 t clock nll0 ?? n + 1hl10 ? n + 2 ll010 n + 3 hl101 xl q 6 q 7 q 8 q 6 q 7 q 8 d s p / s ( t = n + 6 ) ( t = n + 7 ) ( t = n + 8 ) block diagram 2 q 6 p 8 p 4 p 3 p 2 p 1 q 8 3 4 5 6 7 8 15 14 13 12 11 10 9 v ss 1 p 7 v dd p 5 q 7 d s clock p 6 p / s 16 q 6 p 8 p 4 p 3 p 2 p 1 q 8 p 7 p 5 q 7 d s clock p 6 p / s clock xhl l xhh h d s d m q m * x: irrelevant * : q 6 , q 7 , and q 8 are external p / s absolute maximum ratings (v ss = 0v, ta = 25?) parameter symbol limits unit power supply voltage v dd v power dissipation mw operating temperature topr c storage temperature tstg c input voltage v in ? 0.3 ~ v dd + 0.3 v 1000 ( dip ) , 500 ( sop ) pd ? 0.3 ~ + 18 ? 40 ~ + 85 ? 55 ~ + 150 parallel operation
2 standard ics bu4021b / bu4021bf parameter symbol min. typ. max. unit conditions input high level voltage v ih 3.5 v 5 7.0 10 11.0 15 input low level voltage v il 1.5 v 5 3.0 10 4.0 15 input high level current i ih 0.3 m a15v ih = 15v input low level current i il 0.3 m a15v il = 0v output high level voltage v oh 4.95 v 5 i o = 0ma 9.95 10 14.95 15 output low level voltage v ol 0.05 v 5 i o = 0ma 0.05 10 0.05 15 output high level current i oh ? 0.16 ma 5v oh = 4.6v ? 0.4 10 v oh = 9.5v ? 1.2 15 v oh = 13.5v output low level current i ol 0.44 ma 5v ol = 0.4v 1.1 10 v ol = 0.5v 3.0 15 v ol = 1.5v static current dissipation i dd 20 m a 5 v i = v dd , gnd 40 10 80 15 v dd ( v ) electrical characteristics dc characteristics (unless otherwise noted, ta = 25?, v ss = 0v)
3 standard ics bu4021b / bu4021bf output fall time parameter symbol min. typ. max. unit conditions measurement circuit v dd ( v ) t tlh 180 ns 5 fig.1 90 10 65 15 t thl 100 ns 5 fig.1 50 10 40 15 t plh 400 ns 5 fig.1 170 10 115 15 t phl 400 ns 5 fig.1 170 10 115 15 setup time t su 150 ns 5 fig.1 50 10 30 15 minimum clock pulse width t w ( clk ) 150 ns 5 fig.1 75 10 40 15 maximum clock frequency f ( clk ) max. 3.0 mhz 5 fig.1 6.0 10 8.0 15 maximum clock rise / fall time t r ( clk ) t f ( clk ) 15 m s 5 fig.1 5.0 10 4.0 15 minimum p / s control pulse width t w ( p / s ) 150 ns 5 75 10 40 15 input capacitance c in 5 pf "l" to "h" propagation delay time clock to q, p / s to q "h" to "l" propagation delay time clock to q, p / s to q output rise time switching characteristics (unless otherwise noted, v ss = 0v, ta = 25?, c l = 50pf)
4 standard ics bu4021b / bu4021bf sw 2 c l v dd sw 1 p.g. p.g. p / s clk p 1 p 2 p 3 p 4 p 5 p 6 p 7 p 8 d s q 6 q 7 q 8 v ss fig.1 switching characteristics measurement circuit gnd measurement circuit 20ns 20ns t su t w v dd t r parallel or serial data clock or p / s output t plh t f t tlh t thl t phl 90% 50% 10% gnd v dd gnd v oh v ol fig.2 switching characteristics waveform power dissipation: pd (mw) 1200 1000 800 600 400 200 0 0255075100125150 ambient temperature: ta ( c) sop16 dip16 fig.3 power dissipation vs. ambient temperature electrical characteristic curve
5 standard ics bu4021b / bu4021bf dip16 sop16 bu4021b bu4021bf 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 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 external dimensions (units: mm)
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