hi-8422 16-channel discrete-to-digital interface sensing 28 volt / open and open / ground signals description features pin configuration the hi-8422 is a sixteen channel discrete-to-digital interface device. the device has eight channels designed to sense 28 v / open signals and eight channels that sense open / ground signals. data is multiplexed from each bank of sensors to an eight bit digital databus. mixed-signal cmos technology is used to provide superior low-power performance. the device outputs are cmos / ttl compatible and may be disabled (tri-state) using the and pins. the hi-8422 is offered in a small footprint 32-pin plastic quad flat package (pqfp). please contact the holt sales department for other packaging options. ce oe 8 independent 28 volt / open sensing channels 8 independent open / ground sensing channels 5.0 v single supply operation low power cmos technology industrial and extended temperature ranges august 2010 (ds8422 rev. g) 08/10 function table 32 pin pqfp package 24 - n/c 23 - d3 22 - n/c 21 - 0vin8 20 - 28vin8 19 - d4 18 - d5 17 - d6 28vin3 - 1 0vin3 - 2 28vin4 - 3 0vin4 - 4 28vin5 - 5 0vin5 - 6 28vin6 - 7 0vin6 - 8 28vin7 - 9 0vin7 - 10 -11 -12 a0 - 13 vdd - 14 d8 - 15 d7 - 16 oe ce 32 - 0vin2 31 - 28vin2 30 - 0vin1 29 - 28vin1 28 - n/c 27 - gnd 26 - d1 25 - d2 28v 0 v a0 output inputs inputs open x 1 0 0 1 28 volts x 1 0 0 0 x open 0 0 0 0 x ground 0 0 0 1 x x x 1 x high z x x x x 1 high z ce oe HI-8422PQI & hi-8422pqt holt integrated circuits www.holtic.com
pin descriptions hi-8422 pin symbol function description 1 28vin3 discrete input 28 volt / open sensing input, channel 3 2 0vin3 open 3 28vin4 4 0vin4 5 28vin5 6 0vin5 7 28vin6 discrete 9 28vin7 10 0vin7 11 12 13 a0 digital input when a0 is high d1 - d8 outputs data from 28v comparators when a0 is low d1 - d8 show results from 0v comparators 14 vdd 15 d8 16 d7 discrete input / ground sensing input, channel 3 discrete input 28 volt / open sensing input, channel 4 discrete input open / ground sensing input, channel 4 discrete input 28 volt / open sensing input, channel 5 discrete input open / ground sensing input, channel 5 input 28 volt / open sensing input, channel 6 8 0vin6 discrete input open / ground sensing input, channel 6 discrete input 28 volt / open sensing input, channel 7 discrete input open / ground sensing input, channel 7 digital input output enable. d1-d8 are high-impedance if is high digital input chip enable. d1-d8 are high-impedance if is high power positive supply voltage 5.0 v tri-state output logic output, channel 8 tri-state output logic output, channel 7 17 d6 tri-state output logic output, channel 6 18 d5 tri-state output logic output, channel 5 19 d4 tri-state output logic output, channel 4 20 28vin8 discrete input 28 volt / open sensing input, channel 8 21 0vin8 discrete input open / ground sensing input, channel 8 22 n/c not connected 23 d3 tri-state output logic output, channel 3 24 n/c not connected 25 d2 tri-state output logic output, channel 2 26 d1 tri-state output logic output, channel 1 27 gnd power ground 28 n/c not connected 29 28vin1 discrete input 28 volt / open sensing input, channel 1 30 0vin1 discrete input open / ground sensing input, channel 1 31 28vin2 discrete input 28 volt / open sensing input, channel 2 32 0vin2 discrete input open / ground sensing input, channel 2 oe oe ce ce holt integrated circuits 2
block diagram hi-8422 + - + - + - + - + - + - 3.25v reference 0vin3 0vin4 0vin5 0vin6 0vin7 0vin8 gnd + - d1 + - d2 + - d3 + - d4 + - d5 + - d6 oe ce v dd 28vin1 28vin2 28vin3 28vin4 28vin5 28vin6 66 k 29 k 66 k 29 k 66 k 29 k 66 k 29 k 66 k 29 k 66 k 29 k 3.6v reference + - + - 28vin7 28vin8 66 k 29 k 66 k 29 k + - + - v dd 0vin1 0vin2 d7 d8 a0 8 x 2:1 mux 9k 9k 9k 9k 9k 9k 9k 9k 5k 5k 5k 5k 5k 5k 5k 5k 5k 9k holt integrated circuits 3
hi-8422 note: stresses above absolute maximum ratings or outside recommended operating conditions may cause permanent damage to the device. these are stress ratings only. operation at the limits is not recommended. absolute maximum ratings recommended operating conditions supply voltage ( logic input voltage range power dissipation at 25c 350 mw solder temperature 275c for 10 sec storage temperature -65c to +150c vdd) -0.3 v to +7 v -0.3 v to +5.5 v discrete input voltage range: 28v / open sensing -80 v to + 80 v open / ground sensing -80 v to + 80 v supply voltage operating temperature range industrial screening ......... -40c to +85c hi-temp screening ........ -55c to +125c vdd .................................. 4.5 v to 5.5 v dc electrical characteristics vdd = 5.0v , gnd = 0v, t = operating temperature range (unless otherwise specified). a 10% logic inputs ( , ) input voltage input voltage hi v 2.0 v input voltage lo v 0.8 v input current input sink i v = v 1.0 input source i v = 0 v -1.0 outputs logic output voltage high v i = -5 ma 2.4 v low v i = 5 ma 0.4 v logic output voltage (cmos) high v i = -100 ua v - 0.2 v low v iol = 100 ua 0.2 v tri-state output current i v =0vorv 10 supply current v current i v = 0 v (28v inputs) v = v (other inputs) ce oe ih il ih ih dd il il oh oh ol ol oh oh dd ol oz out dd dd dd in dd a a a 10 20 ma in parameter symbol condition min typ max units 28 v / open discrete inputs open state input voltage v input voltage to give high output -5 10 v 28 v state input voltage v input voltage to give low output 14 v open state input current i maximum input current 84 28 v state input current i minimum input current 197 to give low output input resistance r 0v hi-8422 ordering information timing diagrams t,t zl zh ce oe or dx output enable timing t,t zl zh inx t hl input to output propagation delay dx t lh a0 t su t hold input switching threshold the input switching threshold of the open / ground inputs will decrease with increasing series resistance according to the function v = 3.25 - 0.1r where v is the nominal input switching threshold, and r is the value of the external series resistor in kohms. t t switching characteristics propagation delay in to out t , t 500 ns output enable time t , t from or 25 ns output disable time t , t from or 25 ns a0 set-up time t 0 ns a0 hold time t 0 ns parameter symbol condition min typ max units lh hl zl zh lz hz su hold ce oe ce oe ac electrical characteristics vdd = 5.0v , gnd = 0v, t = operating temperature range (unless otherwise specified). a 10% hi - 8422pq x x package description 32 pin plastic quad flatpack pqfp (32ptqs) part number 8422pq temperature range flow burn in -40c to +85c no i -55c to +125c no t part number t i lead finish part number 100% matte tin (pb-free, rohs compliant) f tin / lead (sn / pb) solder blank holt integrated circuits 5
revision history p/n rev date description of change ds4422 g 08/04/10 removed reference to lightning protected inputs throughout datasheet, changed discrete input voltage range and clarified temperature ranges in features. hi-8422 holt integrated circuits 6
package dimensions 32 pin plastic quad flat pack (pqfp) inches (millimeters) package type: 32ptqs .354 (9.00) bsc sq .063 (1.60) .0315 (0.80) .015 .003 (0.375 .075) .055 .002 (1.4 .05) .003 (.08) .004 .002 (0.10 .05) 0 7 .276 (7.00) bsc sq see detail a detail a .006 .002 (0.14 .06) .024 .006 (0.60 .15) .0057 .002 (0.145 .06) max r min r bsc bsc = ?basic spacing between centers? is theoretical true position dimension and has no tolerance. (jedec standard 95) holt integrated circuits 7
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