SN54BCT25244, sn74bct25244 25- w octal buffers/drivers with 3-state outputs scbs064a june 1990 revised november 1993 copyright ? 1993, texas instruments incorporated 21 post office box 655303 ? dallas, texas 75265 ? state-of-the-art bicmos design significantly reduces i ccz ? esd protection exceeds 2000 v per mil-std-883c, method 3015; exceeds 200 v using machine model (c = 200 pf, r = 0) ? designed to facilitate incident-wave switching for line impedances of 25 w or greater ? distributed v cc and gnd pins minimize noise generated by the simultaneous switching of outputs ? package options include plastic small-outline (dw) packages, ceramic chip carriers (fk) and flatpacks (w), and standard plastic and ceramic 300-mil dips (jt, nt) description these 25- w octal buffers and line drivers are designed specifically to improve both the performance and density of 3-state memory address drivers, clock drivers, and bus-oriented receivers and transmitters. these buffers are capable of sinking 188-ma i ol , which facilitates switching 25- w transmission lines on the incident wave. the distributed v cc and gnd pins minimize switching noise for more reliable system operation. when the output-enable (1oe and 2oe ) inputs are low, the device transmits data from the a inputs to the y outputs. when 1oe and 2oe are high, the outputs are in the high-impedance state. the SN54BCT25244 is characterized for operation over the full military temperature range of 55 c to 125 c. the sn74bct25244 is characterized for operation from 0 c to 70 c. function table (each buffer/driver) inputs output oe a y l h h l ll h x z 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 1y1 gnd 1y2 1y3 gnd 1y4 2y1 gnd 2y2 2y3 gnd 2y4 1oe 1a1 1a2 v cc 1a3 1a4 2a1 2a2 v cc 2a3 2a4 2oe SN54BCT25244 . . . jt or w package sn74bct25244 . . . dw or nt package (top view) 3212827 12 13 5 6 7 8 9 10 11 25 24 23 22 21 20 19 2oe 2y4 gnd nc 2y3 2y2 gnd 1a3 v cc 1a2 nc 1a1 1oe 1y1 426 14 15 16 17 18 gnd 1y2 1y3 nc gnd 1y4 2y1 1a4 2a1 2a2 nc v 2a3 2a4 SN54BCT25244 . . . fk package (top view) cc nc no internal connection production data information is current as of publication date. products conform to specifications per the terms of texas instruments standard warranty. production processing does not necessarily include testing of all parameters.
SN54BCT25244, sn74bct25244 25- w octal buffers/drivers with 3-state outputs scbs064a june 1990 revised november 1993 22 post office box 655303 ? dallas, texas 75265 logic symbol 2 logic diagram (positive logic) 1oe en 24 23 1a1 22 1a2 20 1a3 19 1a4 1y1 1 1y2 3 1y3 4 1y4 6 18 2a1 17 2a2 15 2a3 14 2a4 2y1 7 2y2 9 2y3 10 2y4 12 1 1 2 this symbol is in accordance with ansi/ieee std 91-1984 and iec publication 617-12. 2oe en 13 1oe 1a1 1y1 24 23 1 1a2 1y2 22 3 1a3 1y3 20 4 1a4 1y4 19 6 2oe 2a1 2y1 13 18 7 2a2 2y2 17 9 2a3 2y3 15 10 2a4 2y4 14 12 pin numbers shown are for the dw, jt, nt, and w packages. absolute maximum ratings over operating free-air temperature range (unless otherwise noted) 3 supply voltage range, v cc 0.5 v to 7 v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . input voltage range, v i (see note 1) 0.5 v to 7 v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . voltage range applied to any output in the disabled or power-off state, v o 0.5 v to 5.5 v . . . . . . . . . . . . . . . . voltage range applied to any output in the high state, v o 0.5 v to v cc . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . input clamp current, i ik (v i < 0) 30 ma . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . current into any output in the low state, i o : SN54BCT25244 250 ma . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . sn74bct25244 376 ma . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . operating free-air temperature range: SN54BCT25244 55 c to 125 c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . sn74bct25244 0 c to 70 c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . storage temperature range 65 c to 150 c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 stresses beyond those listed under aabsolute maximum ratingso may cause permanent damage to the device. these are stress rating s only, and functional operation of the device at these or any other conditions beyond those indicated under arecommended operating conditi onso is not implied. exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. note 1: the input and output negative-voltage ratings may be exceeded if the input and output clamp-current ratings are observed .
SN54BCT25244, sn74bct25244 25- w octal buffers/drivers with 3-state outputs scbs064a june 1990 revised november 1993 23 post office box 655303 ? dallas, texas 75265 recommended operating conditions (see note 2) SN54BCT25244 sn74bct25244 unit min nom max min nom max unit v cc supply voltage 4.5 5 5.5 4.5 5 5.5 v v ih high-level input voltage 2 2 v v il low-level input voltage 0.8 0.8 v i ik input clamp current 18 18 ma i oh high-level output current 53 80 ma i ol low-level output current 125 188 ma t a operating free-air temperature 55 125 0 70 c note 2: unused or floating inputs must be held high or low. electrical characteristics over recommended operating free-air temperature range (unless otherwise noted) parameter test conditions SN54BCT25244 sn74bct25244 unit parameter test conditions min typ 2 max min typ 2 max unit v ik v cc = 4.5 v, i i = 18 ma 1.2 1.2 v v cc = 4.75 v, i oh = 3 ma 2.7 v oh v cc =45v i oh = 53 ma 2 v v cc = 4 . 5 v i oh = 80 ma 2 i ol = 94 ma 0.38 0.55 0.42 0.55 v ol v cc = 4.5 v i ol = 125 ma 0.8 v i ol = 188 ma 0.7 i i v cc = 5.5 v, v i = 5.5 v 0.1 0.1 ma i ih v cc = 5.5 v, v i = 2.7 v 20 20 m a i il v cc = 5.5 v, v i = 0.5 v 0.6 0.6 ma i ozh v cc = 5.5 v, v o = 2.7 v 50 50 m a i ozl v cc = 5.5 v, v o = 0.5 v 50 50 m a i ccl v cc = 5.5 v, outputs open 90 119 90 119 ma i cch v cc = 5.5 v, outputs open 59 78 59 78 ma i ccz v cc = 5.5 v, outputs open 7 11 7 11 ma c i v cc = 5 v, v i = 2.5 v or 0.5 v 5.5 5.5 pf c o v cc = 5 v, v o = 2.5 v or 0.5 v 17 17 pf 2 all typical values are at v cc = 5 v, t a = 25 c. switching characteristics over recommended ranges of supply voltage and operating free-air temperature, c l = 50 pf (unless otherwise noted) (see note 3) parameter from (input) to (output) v cc = 5 v, t a = 25 c SN54BCT25244 sn74bct25244 unit (input) (output) min typ max min max min max t plh a y 1 3.2 4.9 1 5.6 1 5.5 ns t phl a y 2 4 5.6 2 6.3 2 6 ns t pzh oe y 3.2 5.6 8.5 3.2 9.7 3.2 9.3 ns t pzl oe y 3.7 6.3 9.2 3.7 10.4 3.7 10.2 ns t phz oe y 1.6 3.6 5.5 1.6 6.5 1.6 6.3 ns t plz oe y 3.1 5.3 7.8 3.1 9.5 3.1 8.4 ns note 3: load circuits and voltage waveforms are shown in section 1.
SN54BCT25244, sn74bct25244 25- w octal buffers/drivers with 3-state outputs scbs064a june 1990 revised november 1993 24 post office box 655303 ? dallas, texas 75265
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