12-101 12 absolute maximum ratings 1 v dd logic power supply voltage -0.5v to +7.5v v pp positive high voltage supply -0.5v to +90v logic input voltages -0.3v to v dd +0.3v operating temperature range -40 c to +85 c storage temperature -55 c to +150 c power dissipation 28-pin plcc 2 1.2 watt 28-pin dip 3 1.1 watt notes: 1. all voltages are referenced to ground. absolute maximum ratings are those values at which damage to the device may occur. functional operation under these conditions is not implied. continuous operation of the device at the absolute rating level may affect device reliability. 2. for operations above 25 c derate linearly to 85 c at 20mw/ c. 3. for operations above 25 c derate linearly to 85 c at 18.3mw/ c. HV5812 device 28 pin plastic dip 28 pin plastic chip carrier die HV5812 HV5812p HV5812pj HV5812x 20-channel serial-input vacuum-fluorescent display driver for anode/grid ordering information package options general description the supertex HV5812 is a 20-channel serial input vacuum fluorescent display driver. it combines a 20-bit cmos shift regis- ter, data latches, and control circuitry with high voltage mosfet outputs. the HV5812 is primarily designed for vacuum-fluores- cent displays. the cmos shift register and latches allow direct interfacing with microprocessor-based systems. data input rates are typically over 5.0mhz with 5v logic supply. especially useful for inter-digit blanking, the blanking input disables the output source drives and turns on the sink drivers. use with ttl may require external pull-up resistors to ensure an input logic high. features operating voltage of to up to 80v hvcmos ? technology for high performance high speed source driver up to 3.3mhz data input rate 5.0v cmos logic circuitry excellent noise immunity flexible high voltage supplies
12-102 HV5812 symbol parameter min typ max units conditions i dss output leakage current -5.0 -15 av out = 0v, t a = +70 c hv oh output voltage 78 78.5 v i out = -25ma, v pp = 80v hv ol output voltage v dd = 5v 2.0 3.0 v i out = 1.0ma i sink output pull-down current v dd = 5v 2.0 3.5 ma v out = 5.0v to v pp v ih logic input voltage v dd = 5v 3.5 5.3 v v il logic input voltage -0.3 0.8 v i ih logic input current v dd = 5v 0.05 0.5 av in = v dd i il logic input current v dd = 5v -0.05 -0.5 av in = 0.8v v oh serial data out v dd = 5v 4.5 4.7 v i out = -200 a v ol serial data out v dd = 5v 200 250 mv i out = 200 a f clk maximum clock frequency v dd = 5v 7.5 mhz i ddq supply current v dd = 5v 100 300 a all outputs high v dd = 5v 100 300 a all outputs low i ppq supply current 10 100 a outputs high, no load 10 100 a outputs low, no load electrical characteristics dc characteristics (over recommended operating conditions, t a = 25 c, unless otherwise noted) symbol parameter min nom max units v dd supply voltage 4.5 5.5 v v pp supply voltage 20 80 v t a operating free-air temperature -40 +85 c power-up sequence should be the following: 1. connect ground. 2. apply v dd . 3. set all inputs (data, clk, etc.) to a known state. 4. apply v pp . power-down sequence should be the reverse of the above. recommended operating conditions
12-103 12 HV5812 symbol parameter min typ max units conditions t phl blanking to output delay v dd = 5v 2000 ns c l = 30pf, 50% to 50% t plh blanking to output delay v dd = 5v 1000 ns c l = 30pf, 50% to 50% t f output fall time v dd = 5v 1450 ns c l = 30pf, 90% to 10% t r output rise time v dd = 5v 650 ns c l = 30pf, 10% to 90% t su data set-up time 75 ns see timing diagram t h data hold time 75 ns see timing diagram t pwd minimum data pulse width 150 ns see timing diagram t pwclk minimum clock pulse width 150 ns see timing diagram t cks minimum time between clock activation 300 ns see timing diagram and strobe t pws minimum strobe pulse width 100 ns see timing diagram t sto typical time between strobe activation 500 ns see timing diagram and output transition ac characteristics (t a = 25 c, over operating conditions unless otherwise noted) input and output equivalent circuits v dd input lgnd v pp l/t v r pgnd hv out logic inputs lgnd data out logic data output high voltage outputs v dd
12-104 HV5812 block diagram function table blanking strobe data in clock data out 20-bit shift register 20-bit latch v pp hv out 1 hv out 2 hv out 3 hv out 20 gnd v dd serial clock shift register contents serial strobe latch content blanking output content data input data input input i 1 i 2 i 3 ... i n-1 i n output i 1 i 2 i 3 ... i n-1 i n i 1 i 2 i 3 ... i n-1 i n h l to h h r 1 r 2 ... r n-2 r n-1 r n-1 l l to h l r 1 r 2 ... r n-2 r n-1 r n-1 xh to lr 1 r 2 r 3 ... r n-1 r n r n x x x ... x x x l r 1 r 2 r 3 ... r n-1 r n p 1 p 2 p 3 ... p n-1 p n p n hp 1 p 2 p 3 ... p n-1 p n lp 1 p 2 p 3 ... p n-1 p n x x x ... x x h l l l ... l l note: l = low logic level h = high logic level x = irrelevant p= present state r = previous state timing diagram clk data in strobe blanking hv out t pwclk t pws t phl t f t r t plh t su 50% 50% 50% 90% 90% 10% 50% 10% t h t pwd t cks t sto
12-105 12 HV5812 pin configuration pad function 1v pp 2 data out 3hv out 20 4hv out 19 5hv out 18 6hv out 17 7hv out 16 8hv out 15 9hv out 14 10 hv out 13 11 hv out 12 12 hv out 11 13 blank 14 gnd 15 clock 16 strobe 17 hv out 10 18 hv out 9 19 hv out 8 20 hv out 7 21 hv out 6 22 hv out 5 23 hv out 4 24 hv out 3 25 hv out 2 26 hv out 1 27 data in 28 v dd HV5812 28-pin plcc and dip 18 17 16 15 23 22 21 20 19 25 24 26 27 28 1 2 3 4 5 6 7 8 9 10 11 12 13 14 4 26 25 19 27 28 1 2 3 24 23 22 21 20 12 18 17 16 15 14 13 5 11 678910 top view 28-pin plcc top view 28-pin dip package outlines
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