SN54BCT244, sn74bct244 octal buffers/drivers with 3-state outputs scbs006e october 1987 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 ? p-n-p inputs reduce dc loading ? esd protection exceeds 2000 v per mil-std-883c, method 3015 ? 3-state outputs drive bus lines or buffer memory address registers ? package options include plastic small-outline (dw) and shrink small-outline (db) packages, ceramic chip carriers (fk) and flatpacks (w), and standard plastic and ceramic 300-mil dips (j, n) description these 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. taken together with the bct240 and bct241, these devices provide the choice of selected combinations of inverting and noninverting outputs, symmetrical oe (active-low output-enable) inputs, and complementary oe and oe inputs. the bct244 is organized as two 4-bit buffers/line 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. the SN54BCT244 is characterized for operation over the full military temperature range of 55 c to 125 c. the sn74bct244 is characterized for operation from 0 c to 70 c. function table (each buffer) inputs output oe a y l h h l ll h x z 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 1oe 1a1 2y4 1a2 2y3 1a3 2y2 1a4 2y1 gnd v cc 2oe 1y1 2a4 1y2 2a3 1y3 2a2 1y4 2a1 SN54BCT244 ...j or w p ackage sn74bct244 . . . db or dw or n package (top view) 3 2 1 20 19 9 10 11 12 13 4 5 6 7 8 18 17 16 15 14 1y1 2a4 1y2 2a3 1y3 1a2 2y3 1a3 2y2 1a4 SN54BCT244 . . . fk package (top view) 2y4 1a1 1oe 1y4 2a2 2oe 2y1 gnd 2a1 v cc 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.
SN54BCT244, sn74bct244 octal buffers/drivers with 3-state outputs scbs006e october 1987 revised april 1994 22 post office box 655303 ? dallas, texas 75265 logic symbol 2 logic diagram (positive logic) 1 2 4 6 8 19 11 13 15 17 3 5 7 9 12 14 16 18 1a1 1a2 1a3 1a4 1y1 2a1 2a2 2a3 2a4 2y1 1y2 1y3 1y4 2y2 2y3 2y4 2oe 1oe 2 1a1 4 1a2 6 1a3 8 1a4 en 1 1y1 18 1y2 16 1y3 14 1y4 12 11 2a1 13 2a2 15 2a3 17 2a4 en 19 2y1 9 2y2 7 2y3 5 2y4 3 1oe 2oe 2 this symbol is in accordance with ansi/ieee std 91-1984 and iec publication 617-12. 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . current into any output in the low state: SN54BCT244 96 ma . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . sn74bct244 128 ma . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . operating free-air temperature range: SN54BCT244 55 c to 125 c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . sn74bct244 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 voltage ratings may be exceeded if the input and output current ratings are observed.
SN54BCT244, sn74bct244 octal buffers/drivers with 3-state outputs scbs006e october 1987 revised april 1994 23 post office box 655303 ? dallas, texas 75265 recommended operating conditions SN54BCT244 sn74bct244 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 12 15 ma i ol low-level output current 48 64 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 SN54BCT244 sn74bct244 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 i oh = 3 ma 2.4 3.3 2.4 3.3 v oh v cc = 4.5 v i oh = 12 ma 2 3.2 v i oh = 15 ma 2 3.1 v ol v cc =45v i ol = 48 ma 0.38 0.55 v v ol v cc = 4 . 5 v i ol = 64 ma 0.42 0.55 v i i v cc = 5.5 v, v i = 7 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 1 1 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 os 3 v cc = 5.5 v, v o = 0 100 225 100 225 ma i cch v cc = 5.5 v, outputs open 23 40 23 40 ma i ccl v cc = 5.5 v, outputs open 53 80 53 80 ma i ccz v cc = 5.5 v, outputs open 4 10 4 10 ma 2 all typical values are at v cc = 5 v. 3 not more than one output should be tested at a time, and the duration of the test should not exceed one second.
SN54BCT244, sn74bct244 octal buffers/drivers with 3-state outputs scbs006e october 1987 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 bct244 SN54BCT244 sn74bct244 min typ max min max min max t plh a y 1.2 2.5 4.4 0.9 5.3 0.9 5 ns t phl a y 1.7 3.2 5 1.4 6 1.4 5.5 ns t pzh oe y 2 5.7 7.8 2 9 2 8.7 ns t pzl oe y 2 5.9 8.1 2 9.4 2 8.9 ns t phz oe y 2 5.4 6.7 2 8 2 7.7 ns t plz oe y 2 6.1 7.6 2 9.8 2 8.9 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.
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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