hi-8420, hi-8423 6-channel / 8-channel discrete-to-digital interface sensing open / ground signals description features the hi-8420 is a six channel discrete-to-digital interface device. the hi-8423 has eight channels. mixed-signal cmos technology is used to provide superior low-power performance. the device inputs are configured to sense ground / open discrete signals. the device outputs are cmos / ttl compatible and may be disabled (tri-state) using the and pins. the hi-8420 is a drop-in replacement for the dei1026. for added functionality, the holt hi-8422 offers eight channels of open / ground sensing and eight channels of 28v / ground sensing in a single device. ce oe august 2010 (ds8420 rev. e) 08/10 function table block diagram discrete output input open 0 0 0 ground 0 0 1 x 1 x high z x x 1 high z ce oe + - out1 + - out2 + - out3 + - out4 9k + - out7 + - out8 3.25v reference oe ce v dd in1 in2 in3 in4 in7 in8 gnd 9k 9k 9k 9k 9k 5k 5k 5k 5k 5k 5k 9k 5k + - out5 + out6 9k in5 in6 9k 5k 5k - - pin configurations 6 or 8 independent open / ground sensing channels 5.0v single supply operation low power cmos technology industrial and extended temperature ranges hi-8420 is a drop in replacement for dei1026 hi-8420psi hi-8420pst in1 1 in2 2 in3 3 in4 4 in5 5 in6 6 7 8 oe ce 16 gnd 15 out1 14 out2 13 out3 12 out4 11 out5 10 out6 9 vdd 16-pin plastic soic package (narrow body) 20 gnd 19 out1 18 out2 17 out3 16 in8 15 out4 14 out5 13 out6 12 out7 11 out8 in1 1 in2 2 in3 3 in4 4 in5 5 in6 6 in7 7 8 9 vdd 10 oe ce hi-8423pti hi-8423ptt 20 pin tssop package holt integrated circuits www.holtic.com
pin symbol function description (hi-8420) (hi-8423) 1 1 in1 discrete input open / ground sensing input, channel 1 2 2 in2 3 3 in3 4 4 in4 5 5 in5 6 6 in6 7 8 digital 9 10 v power - 11 out8 tri-state output - 12 out7 10 13 out6 11 14 out5 12 15 out4 -16 discrete input open / ground sensing input, channel 2 discrete input open / ground sensing input, channel 3 discrete input open / ground sensing input, channel 4 discrete input open / ground sensing input, channel 5 discrete input open / ground sensing input, channel 6 - 7 in7 discrete input open / ground sensing input channel 7 input output enable. out1-out8 are high-impedance if is high 8 9 digital input chip enable. out1-out8 are high-impedance if is high positive supply voltage 5.0 v logic output, channel 8 tri-state output logic output, channel 7 tri-state output logic output, channel 6 tri-state output logic output, channel 5 tri-state output logic output, channel 4 in8 discrete input open / ground sensing input, channel 8 13 17 out3 tri-state output logic output, channel 3 14 18 out2 tri-state output logic output, channel 2 15 19 out1 tri-state output logic output, channel 1 16 20 gnd power ground oe oe ce ce dd hi-8420, hi-8423 pin descriptions holt integrated circuits 2
hi-8420, hi-8423 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 operating temperature range industrial screening ......... -40c to +85c hi-temp screening ........ -55c to +125c vdd .................................. 4.5 v to 5.5 v 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 -80 v to + 80 v 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 = v (all inputs) 5 10 ma switching characteristics propagation delay in to out t , t 150 ns output enable time t , t from or 25 ns output disable time t , t from or 25 ns ce oe ce oe ce oe ih il ih ih dd il il oh oh ol ol oh oh dd ol oz out dd dd dd in dd lh hl zl zh lz hz a a a parameter symbol condition min typ max units discrete inputs ground state input voltage v input voltage to give high output 3.0 v open state input voltage v input voltage to give low output 3.5 v ground state input resistor r resistor from input to ground 0 100 open state input resistor r resistor from input to ground 100 k to give low output input source current i current sourced into 100 -100 -330 a to ground reverse leakage current i v = 35 v, v = 0 v 5.0 m sg so ig io io ir in dd to give high output a holt integrated circuits 3
hi - 842xxx x x package description 20 pin plastic tssop (20ht) 16 pin plastic narrow body soic (16hn) part number 8423pt 8420ps 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 timing diagrams ordering information 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 hi-8420, hi-8423 t,t zl zh ce oe or outx output enable timing t,t zl zh inx t hl input to output propagation delay outx t lh holt integrated circuits 4
revision history p/n rev date description of change ds8420 e 08/04/10 removed reference to lightning protected inputs throughout datasheet, increased discrete input voltage range and added reference to available temperature ranges. hi-8420, hi-8423 holt integrated circuits 5
package dimensions 16-pin plastic small outline (soic) - nb (narrow body) inches (millimeters) package type: 16hn bsc = ?basic spacing between centers? is theoretical true position dimension and has no tolerance. (jedec standard 95) 0 to 8 detail a .0025 .002 (.064 .038) .033 .017 (.838 .432) .061 .007 (1.549 .178) .0165 .003 (.419 .089) .390 .004 (9.90 .10) .236 .008 (5.99 .20) .0087 .0015 (.220 .029) see detail a .1525 .0025 (3.87 .06) top view .050 (1.27) bsc inches (millimeters) package type: 20ht 20-pin plastic tssop bsc = ?basic spacing between centers? is theoretical true position dimension and has no tolerance. (jedec standard 95) pin 1 .025 (.65) bsc .031 (0.800) .041(1.050) 0.252 (6.400) 0.259 (6.600) 0.007 (0.190) 0.012 (0.300) 0.035 (0.889) 0.047 (1.200) 0.002 (0.050) 0.006 (0.150) 0.004 (0.090) 0.008 (0.200) see detail a detail a 0.169 (4.300) 0.177 (4.500) 0.246 (6.250) 0.258 (6.550) 0.018 (0.450) 0.029 (0.750) gate plane 0.010 (0.254) 0 to 8 holt integrated circuits 6
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