1 memory all data sheets are subject to change without notice (858) 503-3300 - fax: (858) 503-3301 - www.maxwell.com octal buffers/drivers 54bct244 ?2001 maxwell technologies all rights reserved. 12.19.01 rev 5 1000608 f eatures : ? 3-state outputs drive bus lines or buffer memory address registers ?r ad -p ak ? radiation-hardened against natural space radia- tion ? total dose hardness: - >100 krad (si), depending upon space mission ? package: - 20-pin r ad -p ak ? flat package ? operating temperature range: -55 to 125 c ? p-n-p inputs reduce dc loading ?typical v olp (output ground bounce) - < 0.8 v at v cc =3.3 v, t a =25 c ? esd protection exceeds 2000 v d escription : maxwell technologies? 54bct244 octal buffers and line driv- ers features a greater than 100 krad (si) total dose tolerance; depending upon space misssion. the 54bct244 is organized as two 4-bit drivers with separate output enable (oe ) inputs. when oe is low, the device passes data from the a inputs to the y outputs. when oe is high, the outputs are in the high impedance state. maxwell technologies' patented r ad -p ak ? packaging technol- ogy incorporates radiation shie lding in the microcircuit pack- age. it eliminates the need for box shielding while providing the required radiation shielding for a lifetime in orbit or a space mission. in a geo orbit, r ad -p ak provides true greater than 100 krad (si) total radiation dose tolerance, dependent upon space mission. this product is available with packaging and screening up to class s. logic diagram
memory 2 all data sheets are subject to change without notice ?2001 maxwell technologies all rights reserved. octal buffers/drivers 54bct244 12.19.01 rev 5 1000608 t able 1. p inout d escription p in s ymbol d escription 1, 19 1oe -2oe output enables 2, 4, 6, 8 1a1-1a4 input 3, 5, 7, 9 2y4-2y1 output 10 gnd ground 11, 13, 15, 17 2a1-2a4 input 12, 14, 16, 18 1y4-1y1 output 20 v cc power supply t able 2. 54bct244 a bsolute m aximum r atings 1 1. stresses above the absolute maximum rating may cause per manent damage to the device. extended operation at the maxi- mum levels may degrade performance and affect reliability. p arameter s ymbol m in m ax u nit supply voltage range v cc -0.5 7.0 v input voltage range 2 2. the input and output voltage ratings may be exceeded if the input and output current ratings are observed. v i -0.5 7.0 v voltage range applied to any output in the disable or power-off state 2 v o -0.5 5.5 v voltage range applied to any output in high state 2 v o -0.5 v cc v current into any output in the low state i o -- 96 ma total power dissipation @ t a = +55 c 3 3. must be able to withstand the additional p d due to short circuit test, e.g. i ds . the p d number is based upon dc values. p d -- 651 mw operating temperature range t a -55 125 c storage temperature range t s -65 150 c t able 3. d elta l imits p arameter v ariation i cc(op) 10% of specified value on table 5 i ozh 10% of specified value on table 5 i ozl 10% of specified value on table 5
memory 3 all data sheets are subject to change without notice ?2001 maxwell technologies all rights reserved. octal buffers/drivers 54bct244 12.19.01 rev 5 1000608 t able 4. 54bct244 r ecommended o perating c onditions 1 p arameter s ymbol m in m ax u nit supply voltage v cc 4.5 5.5 v high-level input voltage v ih 2.0 -- v low-level input voltage v il -- 0.8 v high-level output current i oh -- -12 ma low-level output current i ol -- 48 ma input clamp current i ik -- -18 ma thermal impedance ? flat package jc -- 5.56 c/w operating temperature t a -55 125 c 1. all unused control inputs must be held high or low to ensure proper device operation. t able 5. 54bct244 dc e lectrical c haracteristics (v cc = 5v 10%, t a = -55 c to 125 c, unless otherwise specified ) p arameter s ymbol t est c onditions m in m ax u nit input clamp voltage v ik v cc = 4.5 v i i = -18 ma -- -1.2 v high-level output voltage v oh v cc = 4.5 v i oh = -3 ma 2.4 -- v i oh = -12 ma 2 -- low-level output voltage v ol v cc = 4.5 v i ol = 48 ma -- 0.55 v input current i i v cc = 5.5 v v i = 7 v 0.1 ma off-state output current high-level volt- age applied i ozh v cc = 5.5 v v i = 2.7 v -- 50 a off-state output current low-level volt- age applied i ozl v cc = 5.5 v v o = 0.5 v -- -50 a high level input current i ih1 v cc = 5.5 v v i = 7 v -- 0.1 ma i ih2 v cc = 5.5 v v i = 2.7 v -- 20 a low level input current i il v cc = 5.5 v v i = 0.5 v -- -1.0 ma short-circuit output current 1 1. not more than one output should be shorted at one time and the duration of test shall not exceed one second. i os v cc = 5.5 v v o = 0.0 v -100 -225 ma supply current, outputs high i cch v cc = 5.5 v outputs open -- 40 ma supply current, outputs low i ccl v cc = 5.5 v outputs open -- 80 ma supply current, outputs disabled to high impedance state i ccz v cc = 5.5 v outputs open -- 10 ma
memory 4 all data sheets are subject to change without notice ?2001 maxwell technologies all rights reserved. octal buffers/drivers 54bct244 12.19.01 rev 5 1000608 t able 6. 54bct244 ac e lectrical c haracteristics (v cc = 5v 10%, t a = -55 c to 125 c, unless otherwise specified ) p arameter s ymbol t est c onditions m in m ax u nit propagation delay time an to yn t plh v cc = 4.5 to 5.5 v c l = 50 pf r 1 = 500 ? r 2 = 500 ? 0.9 5.3 ns t phl t a = -55 to +125 c1.46 t plh v cc = 5.0 v c l = 50 pf r 1 = 500 ? r 2 = 500 ? 1.2 4.4 t phl t a = +25 c1.75 output enable time oe to yn t pzh v cc = 4.5 to 5.5 v c l = 50 pf r 1 = 500 ? r 2 = 500 ? 29ns t pzl t a = -55 to +125 c29.4 t pzh v cc = 5.0 v c l = 50 pf r 1 = 500 ? r 2 = 500 ? 27.8 t pzl t a = +25 c28.1 output disable time oe to yn t phz v cc = 4.5 to 5.5 v c l = 50 pf r 1 = 500 ? r 2 = 500 ? 28ns t plz t a = -55 to +125 c29.8 t phz v cc = 5.0 v c l = 50 pf r 1 = 500 ? r 2 = 500 ? 26.7 t plz t a = +25 c27.6 t able 7. f unction t able ( each buffer ) inputs output oe ay lhh ll l hx z
memory 5 all data sheets are subject to change without notice ?2001 maxwell technologies all rights reserved. octal buffers/drivers 54bct244 12.19.01 rev 5 1000608 f igure 1. l oad c ircuit for o utputs f igure n ote : 1. c l includes probe and jog capacitance f igure 2. v oltage w aveforms p ulse d uration f igure 3. o utput e nable t iming p arameter m easurement i nformation t est s1 t plh /t phl open t plz /t pzl 6v t phz /t pzh gnd
memory 6 all data sheets are subject to change without notice ?2001 maxwell technologies all rights reserved. octal buffers/drivers 54bct244 12.19.01 rev 5 1000608 f igure 4. v oltage s etup and h old t imes f igure 5. p ropagation d elay t imes i nverting and n on - inverting o utputs figure notes: 2. all input pulses are supplied by generators having the following characteristics: prr < 10 mhz, z o = 50 ? , t r < 2.5 ns, t f < 2.5 ns. 3. waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control. waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control. 4.the outputs are measured one at a time with one transition per measurement.
memory 7 all data sheets are subject to change without notice ?2001 maxwell technologies all rights reserved. octal buffers/drivers 54bct244 12.19.01 rev 5 1000608 f20-01 note: all dimensions in inches 20 p in r ad -p ak ? f lat p ackage s ymbol d imension m in n om m ax a 0.128 0.141 0.154 b 0.015 0.017 0.022 c 0.003 0.005 0.009 d 0.470 0.480 0.490 e 0.287 0.295 0.303 e1 -- -- 0.333 e2 0.155 0.160 -- e3 0.030 0.068 -- e 0.050bsc l 0.370 0.380 0.390 q 0.035 0.039 0.042 s1 0.005 0.007 -- n20
memory 8 all data sheets are subject to change without notice ?2001 maxwell technologies all rights reserved. octal buffers/drivers 54bct244 12.19.01 rev 5 1000608 important notice: these data sheets are created using the chip manufacturer?s published specifications. maxwell technologies verifies functionality by testing key parameters either by 100% testing, sample test ing or characterization. the specifications presented within these data sheets represent the latest and most accurate information available to date. however, these specifications are subject to change without notice and maxwell technologies assumes no responsibility for the us e of this information. maxwell technologies? products are not authorized for use as critical components in life support devices or systems without express written approval from maxwell technologies. any claim against maxwell technologies must be made within 90 days from the date of shipment from maxwell tech- nologies. maxwell technologies? liability shall be limited to replacement of defective parts.
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