1 m e m o r y all data sheets are subject to change without notice (858) 503-3300 - fax: (858) 503-3301 - www.maxwell.com octal buffers transceiver 54bct245 ?2002 maxwell technologies all rights reserved. 7.25.02 rev 5 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 +125c bi-cmos design esd protection exceeds 2000v d escription : maxwell technologies? 54bct245 octal bus transceiver fea- tures a greater than 100 krad (si) total dose tolerance. the 54bct245 is designed specifically for asynchronous commu- nication between data buses. the 54bct245 transmits data from the a bus to the b bus or from the b bus to the a bus depending upon the level at the direction-control (dir) input. the output-enable (oe) input can be used to disable the device so the buses are effectively isolated. maxwell technologies' patented r ad -p ak ? packaging technol- ogy incorporates radiation shielding in the microcircuit pack- age. it eliminates the need for box shielding while providing the required radiation shielding for a lifetime in orbit or space mission. in a geo orbit, r ad -p ak provides greater than 100 krad (si) radiation dose tolerance. this product is available with screening up to class s. logic diagram
m e m o r y 2 all data sheets are subject to change without notice ?2002 maxwell technologies all rights reserved. octal buffers transceiver 54bct245 7.25.02 rev 1 t able 1. p inout d escription p in s ymbol d escription 1 dir directional control input 2-9 a1-a8 bi-directional i/o?s with tri-state 10 gnd ground 11-18 b8-b1 bi-directional i/o?s with tri-state 19 oe output enable 20 v cc supply power t able 2. 54bct245 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 control input 3/i/o ports 2 i/o ports 3 2. the input and output voltage ratings may be exceeded if the input and output current ratings are observed. v i -0.5 -0.5 7.0 5.5 v voltage range applied to any output in the disable or power-off state v o -0.5 7.0 v voltage range applied to any output in high state 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 input clamp current i ik (v i < 0) -- -30 ma 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(ol) 10% of specified value in table 5 i cc(oh) 10% of specified value in table 5 i cc(od) 10% of specified value in table 5
m e m o r y 3 all data sheets are subject to change without notice ?2002 maxwell technologies all rights reserved. octal buffers transceiver 54bct245 7.25.02 rev 1 t able 4. 54bct245 r ecommended o perating c onditions 1 1. all unused control inputs must be held high or low to ensure proper device operation. 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 a port b port i oh -- -3 -12 ma low-level output current a port b port i ol -- 20 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 t able 5. 54bct245 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 s ubgroups m in m ax u nit input clamp voltage v ik v cc = 4.5 v i i = -18.0 ma 1, 2, 3 -- -1.2 v high-level output voltage v oh v cc = 4.5 v port a i oh = -1 ma 1, 2, 3 2.5 -- v i oh = -3 ma 2.4 -- port b i oh = -3 ma 2.4 -- i oh = -12 ma 2 -- low-level output voltage v ol v cc = 4.5 v port a i ol = 20 ma 1, 2, 3 -- 0.5 v port b i ol = 48 ma -- 0.55 input current i i v cc = 5.5 v a or b port v i = 5.5v 1, 2, 3 1 ma control input 0.1 high level input current 1 i ih v cc = 5.5 v a or b port v i = 2.7 v 1, 2, 3 -- 70 a control input -- 20 a low level input current 2 i il v cc = 5.5 v a or b port v in = 0.5 v 1, 2, 3 -- -0.65 ma control input -1.2 short-circuit output current 2 i os v cc = 5.5 v a port v o = 0 v 1, 2, 3 -60 -150 ma b port -100 -225 supply current, outputs high i cch a to b v cc = 5.5 v 1, 2, 3 -- 57 ma supply current, outputs low i ccl a to b v cc = 5.5 v 1, 2, 3 -- 90 ma
m e m o r y 4 all data sheets are subject to change without notice ?2002 maxwell technologies all rights reserved. octal buffers transceiver 54bct245 7.25.02 rev 1 supply current, outputs dis- abled to high impedance state i ccz v cc = 5.5 v 1, 2, 3 -- 15 ma input capacitance c i 3 v i = 2.5 v or 0.5v control input v cc = 5.5 v 1, 2, 3 7 pf input output capacitance c io 3 v cc = 5.5 v a to b v i = 2.5 v or 0.5 v 9pf b to a 12 1. for i/o ports, the parameters i ih and i il include the off-state output current. 2. not more than one output should be shorted at one time and the duration of test shall not exceed one second. 3. guaranteed by design. t able 6. 54bct245 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 s ubgroups m in m ax u nit propagation delay time from a or b to b or a t plh v cc = 4.5 to 5.5 v r 1 = 500 ? c l = 50 pf r 2 = 500 ? 9, 10, 11 1 7.2 ns t phl t a = -55 to +125 c1.57.6 t plh v cc = 5.0 v r 1 = 500 ? c l = 50 pf r 2 = 500 ? 16 t phl t a = +25 c1.56.6 output enable time oe to yn t pzh v cc = 4.5 to 5.5 v r 1 = 500 ? c l = 50 pf r 2 = 500 ? 9, 10, 11 1.5 11.2 ns t pzl t a = -55 to +125 c 1.5 11.8 t pzh v cc = 5.0 v r 1 = 500 ? c l = 50 pf r 2 = 500 ? 1.5 9.4 t pzl t a = +25 c 1.5 10.2 output disable time oe to yn t phz v cc = 4.5 to 5.5 v r 1 = 500 ? c l = 50 pf r 2 = 500 ? 9, 10, 11 1.5 9.7 ns t plz t a = -55 to +125 c1.59.6 t phz v cc = 5.0 v r 1 = 500 ? c l = 50 pf r 2 = 500 ? 1.5 8.3 t plz t a = +25 c1.57.8 t able 5. 54bct245 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 s ubgroups m in m ax u nit
m e m o r y 5 all data sheets are subject to change without notice ?2002 maxwell technologies all rights reserved. octal buffers transceiver 54bct245 7.25.02 rev 1 f igure 1. l oad c ircuit for o utputs figure note: 1.c l includes probe and jig capacitance. f igure 2. v oltage w aveforms p ulse d uration t able 7. f unction t able inputs operation oe dir l l b data to a bus l h a data to b bus hx isolation p arameter m easurement i nformation t est s1 t plh /t phl open t plz /t pzl 6v t phz /t pzh gnd
m e m o r y 6 all data sheets are subject to change without notice ?2002 maxwell technologies all rights reserved. octal buffers transceiver 54bct245 7.25.02 rev 1 f igure 3. o utput e nable t iming 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.
m e m o r y 7 all data sheets are subject to change without notice ?2002 maxwell technologies all rights reserved. octal buffers transceiver 54bct245 7.25.02 rev 1 f20-01 note: all dimensions in inches 20 p in r ad -p ack ? 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
m e m o r y 8 all data sheets are subject to change without notice ?2002 maxwell technologies all rights reserved. octal buffers transceiver 54bct245 7.25.02 rev 1 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 testing 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 use 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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