SN54BCT25245, sn74bct25245 25- w octal bus transceivers with 3-state outputs scbs053b may 1990 revised april 1994 copyright ? 1994, 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 the bct25245 is a 25- w octal bus transceiver designed for asynchronous communication between data buses. it improves both the performance and density of 3-state memory address drivers, clock drivers, and bus-oriented transceivers. the device allows data transmission from the a bus to the b bus or from the b bus to the a bus depending upon the logic level at the direction-control (dir) input. the output-enable (oe ) input can disable the device so that both buses are effectively isolated. these transceivers 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. the SN54BCT25245 is characterized for opera- tion over the full military temperature range of 55 c to 125 c. the sn74bct25245 is characterized for operation from 0 c to 70 c. function table inputs operation oe dir operation l l b data to a bus l h a data to b bus h x isolation 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 a1 gnd a2 a3 gnd a4 a5 gnd a6 a7 gnd a8 dir b1 b2 v cc b3 b4 b5 b6 v cc b7 b8 oe SN54BCT25245 . . . jt or w package sn74bct25245 . . . dw or nt package (top view) 3212827 12 13 5 6 7 8 9 10 11 25 24 23 22 21 20 19 oe a8 gnd nc a7 a6 gnd b3 v cc b2 nc b1 dir a1 426 14 15 16 17 18 gnd a2 a3 nc gnd a4 a5 b4 b5 b6 nc v b7 b8 SN54BCT25245 . . . fk package (top view) cc nc no internal connection unless otherwise noted this document contains production data information 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.
SN54BCT25245, sn74bct25245 25- w octal bus transceivers with 3-state outputs scbs053b may 1990 revised april 1994 22 post office box 655303 ? dallas, texas 75265 logic symbol 2 logic diagram (positive logic) b2 22 b3 20 b4 19 a5 7 a6 9 a7 10 a8 12 a2 3 a3 4 a4 6 oe a1 1 g3 13 3en2[ab] b5 18 b6 17 b7 15 b8 14 b1 23 3en1[ba] 24 dir dir oe a1 b1 24 1 23 13 to seven other channels 1 2 2 this symbol is in accordance with ansi/ieee std 91-1984 and iec publication 617-12. 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): control inputs 0.5 v to 7 v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . i/o ports 0.5 v to 5.5 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 (b port) 0.5 v to v cc . . . . . . . . . . . . . . . . . . . . . . . . input clamp current, i ik 30 ma . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . current into any output in the low state, i o : SN54BCT25245 (a port) 250 ma . . . . . . . . . . . . . . . . . . . . . . . . . . SN54BCT25245 (b port) 40 ma . . . . . . . . . . . . . . . . . . . . . . . . . . . sn74bct25245 (a port) 376 ma . . . . . . . . . . . . . . . . . . . . . . . . . . sn74bct25245 (b port) 48 ma . . . . . . . . . . . . . . . . . . . . . . . . . . . operating free-air temperature range: SN54BCT25245 55 c to 125 c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . sn74bct25245 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 .
SN54BCT25245, sn74bct25245 25- w octal bus transceivers with 3-state outputs scbs053b may 1990 revised april 1994 23 post office box 655303 ? dallas, texas 75265 recommended operating conditions SN54BCT25245 sn74bct25245 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 out p ut current a port 53 80 ma i oh high - le v el o u tp u t c u rrent b port 3 3 ma i ol low level out p ut current a port 125 188 ma i ol lo w- le v el o u tp u t c u rrent b port 20 24 ma t a operating free-air temperature 55 125 0 70 c electrical characteristics over recommended operating free-air temperature range (unless otherwise noted) parameter test conditions SN54BCT25245 sn74bct25245 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 =45v i oh = 53 ma 2 v oh a port v cc = 4 . 5 v i oh = 80 ma 2 v v oh v cc = 4.75 v, i oh = 3 ma 2.7 v b port v cc = 4.5 v, i oh = 3 ma 2.4 3.3 2.4 3.3 i ol = 94 ma 0.38 0.55 0.42 0.55 a port v cc = 4.5 v i ol = 125 ma 0.8 v ol i ol = 188 ma 0.7 v b p ort v cc =45v i ol = 20 ma 0.3 0.5 b port v cc = 4 . 5 v i ol = 24 ma 0.35 0.5 i a or b port v cc =55v v i =55v 0.25 0.25 ma i i control input v cc = 5 . 5 v , v i = 5 . 5 v 0.1 0.1 ma i 3 a or b port v cc =55v v i =27v 70 70 m a i ih 3 control input v cc = 5 . 5 v , v i = 2 . 7 v 20 20 m a i 3 a or b port v cc =55v v i =05v 0.6 0.6 ma i il 3 control input v cc = 5 . 5 v , v i = 0 . 5 v 0.6 0.6 ma i os b port only ? v cc = 5.5 v, v o = 0 60 150 60 150 ma i cch a to b v cc =55v 36 46 36 46 ma i cch b to a v cc = 5 . 5 v 63 80 63 80 ma i ccl a to b v cc =55v 48 60 48 60 ma i ccl b to a v cc = 5 . 5 v 95 125 95 125 ma i ccz v cc = 5.5 v 12 16 12 16 ma c i control input v cc = 5 v, v i = 2.5 v or 0.5 v 8 8 pf c i a port v cc =5v v o =25vor05v 18 18 p f c io b port v cc = 5 v , v o = 2 . 5 v or 0 . 5 v 8 8 pf 2 all typical values are at v cc = 5 v, t a = 25 c. 3 for i/o ports, the parameters i ih and i il include the off-state output current. not more than one output should be tested at a time, and the duration of the test should not exceed one second. ? testing for this parameter on the a port is not recommended. product preview information concerns products in the formative or design phase of development. characteristic data and other specifications are design goals. texas instruments reserves the right to change or discontinue these products without notice.
SN54BCT25245, sn74bct25245 25- w octal bus transceivers with 3-state outputs scbs053b may 1990 revised april 1994 24 post office box 655303 ? dallas, texas 75265 switching characteristics (see note 2) parameter from (input) to (output) v cc = 5 v, c l = 50 pf, r1 = 500 w , r2 = 500 w , t a = 25 c v cc = 4.5 v to 5.5 v, c l = 50 pf, r1 = 500 w , r2 = 500 w , t a = min to max 2 unit bct25245 SN54BCT25245 sn74bct25245 min typ max min max min max t plh a b 1.2 3.3 5.1 1.2 5.8 1.2 5.7 ns t phl a b 1.9 4.3 6.7 1.9 7.6 1.9 7.2 ns t plh b a 1.2 3.3 4.8 1.2 5.7 1.2 5.5 ns t phl b a 2.1 4 5.6 2.1 6.4 2.1 6.2 ns t pzh oe a 3.7 6.3 8.4 3.7 10.1 3.7 9.6 ns t pzl oe a 4.5 7.4 9.2 4.5 11.1 4.5 10.3 ns t phz oe a 1.8 3.7 5.5 1.8 6.4 1.8 6.2 ns t plz oe a 3.3 5.1 7.2 3.3 9.6 3.3 8.3 ns t pzh oe b 3.4 5.7 7.9 3.4 9.2 3.4 8.9 ns t pzl oe b 4.3 6.6 8.7 4.3 10.1 4.3 9.7 ns t phz oe b 2.7 4.5 6.3 2.7 7.2 2.7 6.9 ns t plz oe b 1.7 4.5 6.8 1.7 8.3 1.7 7.5 ns 2 for conditions shown as min or max, use the appropriate value specified under recommended operating conditions. note 2: load circuits and voltage waveforms are shown in section 1. product preview information concerns products in the formative or design phase of development. characteristic data and other specifications are design goals. texas instruments reserves the right to change or discontinue these products without notice.
important notice texas instruments and its subsidiaries (ti) reserve the right to make changes to their products or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. all products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those pertaining to warranty, patent infringement, and limitation of liability. ti warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with ti's standard warranty. testing and other quality control techniques are utilized to the extent ti deems necessary to support this warranty. specific testing of all parameters of each device is not necessarily performed, except those mandated by government requirements. certain applications using semiconductor products may involve potential risks of death, personal injury, or severe property or environmental damage (acritical applicationso). ti semiconductor products are not designed, authorized, or warranted to be suitable for use in life-support devices or systems or other critical applications. inclusion of ti products in such applications is understood to be fully at the customer's risk. in order to minimize risks associated with the customer's applications, adequate design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. ti assumes no liability for applications assistance or customer product design. ti does not warrant or represent that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other intellectual property right of ti covering or relating to any combination, machine, or process in which such semiconductor products or services might be or are used. ti's publication of information regarding any third party's products or services does not constitute ti's approval, warranty or endorsement thereof. copyright ? 1998, texas instruments incorporated
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