hi-8421, hi-8424 6-channel / 8-channel discrete-to-digital interface sensing 28v / open signals description features the hi-8421 is a six channel discrete-to-digital interface device.the hi-8424 has eight channels. mixed-signal cmos technology is used to provide superior low-power performance. the device inputs are configured to sense 28v / open discrete signals. the device outputs are cmos / ttl compatible and may be disabled (tri-state) using the and pins. the hi-8421 is a drop-in replacement for the dei1054. 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 (ds8421 rev. f) 08/10 function table block diagram discrete output input open 0 0 1 28 volts 0 0 0 x 1 x high z x x 1 high z ce oe + - out1 + - out2 + - out3 + - out4 + - out7 + - out8 oe ce v dd in1 in2 in3 in4 in7 in8 gnd 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 + - out5 + - out6 in5 in6 29 k 66 k 29 k 66 k 6 or 8 independent 28v / open sensing channels 5.0v single supply operation low power cmos technology industrial and extended temperatures hi-8421 is a drop in replacement for dei1054 pin configurations pin configurations hi-8421psi hi-8421pst 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 hi-8421psi hi-8421pst 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) 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-8424pti hi-8424ptt 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-8424pti hi-8424ptt 20 pin tssop package 20 pin tssop package holt integrated circuits www.holtic.com
pin descriptions 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. 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 absolute maximum ratings recommended operating conditions electrical characteristics vdd = 5.0v , gnd = 0v, t = operating temperature range (unless otherwise specified). a 10% parameter symbol condition min typ max units 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 electrical characteristics (cont.) vdd = 5.0v , gnd = 0v, t = operating temperature range (unless otherwise specified). a 10% timing diagrams ordering information hi - 842xxx x x package description 20 pin plastic tssop (20ht) 16 pin plastic narrow body soic (16hn) part number 8424pt 8421ps temperature range flow burn in -40c to +85c no i -55c to +125c no t part number t i part number lead finish 100% matte tin (pb-free, rohs compliant) f tin / lead (sn / pb) solder blank 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 parameter symbol condition min typ max units 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 (all inputs) 5 10 ma 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 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 lh hl zl zh lz hz a a a hi-8421, hi-8424 holt integrated circuits 3
revision history p/n rev date description of change ds8421 f 08/04/10 removed reference to lightning protection throughout datasheet and added reference to available temperature ranges. hi-8421, hi-8424 holt integrated circuits 4
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 5
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