sdas054b ? december 1982 ? revised january 1995 copyright ? 1995, texas instruments incorporated 1 post office box 655303 ? dallas, texas 75265 post office box 1443 ? houston, texas 77251?1443 ? low-power version of sn74als240a ? 3-state outputs drive bus lines or buffer memory address registers ? pnp inputs reduce dc loading ? package options include plastic small-outline (dw) packages and standard plastic (n) 300-mil dips description this octal buffer and line driver is designed specifically to improve both the performance and density of 3-state memory address drivers, clock drivers, and bus-oriented receivers and transmitters. the designer has a choice of selected combinations of inverting and noninverting outputs, symmetrical active-low output-enable (oe ) inputs, and complementary oe and oe inputs. this device features high fan-out and improved fan-in. the sn74als1240 is characterized for operation from 0 c to 70 c. logic symbol ? logic diagram (positive logic) ? this symbol is in accordance with ansi/ieee std 91-1984 and iec publication 617-12. 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 1oe 2oe 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 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 dw or n package (top view)
sdas054b ? december 1982 ? revised january 1995 2 post office box 655303 ? dallas, texas 75265 post office box 1443 ? houston, texas 77251?1443 absolute maximum ratings over operating free-air temperature range (unless otherwise noted) ? supply voltage, v cc 7 v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . input voltage, v i 7 v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . voltage applied to a disabled 3-state output 5.5 v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . operating free-air temperature range, t a 0 c to 70 c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . storage temperature range ?65 c to 150 c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ? stresses beyond those listed under ?absolute maximum ratings? may cause permanent damage to the device. these are stress ratings only, a nd functional operation of the device at these or any other conditions beyond those indicated under ?recommended operating conditi ons? is not implied. exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. recommended operating conditions min nom max unit v cc supply voltage 4.5 5 5.5 v v ih high-level input voltage 2 v v il low-level input voltage 0.8 v i oh high-level output current ?15 ma i ol low-level output current 16 ma t a operating free-air temperature 0 70 c electrical characteristics over recommended operating free-air temperature range (unless otherwise noted) parameter test conditions min typ ? max unit v ik v cc = 4.5 v, i i = ? 18 ma ?1.2 v v cc = 4.5 v to 5.5 v, i oh = ? 0.4 ma v cc ?2 v oh v cc = 4.5 v i oh = ? 3 ma 2.4 3.2 v v oh v cc = 4.5 v i oh = ? 15 ma 2 v v ol v cc = 4.5 v i ol = 8 ma 0.25 0.4 v v ol v cc = 4.5 v i ol = 16 ma 0.35 0.5 v i ozh v cc = 5.5 v, v o = 2.7 v 20 a i ozl v cc = 5.5 v, v o = 0.4 v ?20 a i i v cc = 5.5 v, v i = 7 v 0.1 ma i ih v cc = 5.5 v, v i = 2.7 v 20 a i il v cc = 5.5 v, v i = 0.4 v ?0.1 ma i o ? v cc = 5.5 v, v o = 2.25 v ?30 ?112 ma outputs high 5 8 i cc v cc = 5.5 v outputs low 8.5 14 ma i cc v cc = 5.5 v outputs disabled 8.1 13 ma ? all typical values are at v cc = 5 v, t a = 25 c. for i/o ports, the parameters i ih and i il include the off-state output current. ? the output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, i os .
sdas054b ? december 1982 ? revised january 1995 3 post office box 655303 ? dallas, texas 75265 post office box 1443 ? houston, texas 77251?1443 switching characteristics (see figure 1) parameter from (input) to (output) v cc = 4.5 v to 5.5 v, c l = 50 pf, r1 = 500 ? , r2 = 500 ? , t a = min to max ? unit min max t plh a y 2 13 ns t phl a y 2 13 ns t pzh oe y 4 20 ns t pzl oe y 6 22 ns t phz oe y 2 10 ns t plz oe y 3 13 ns ? for conditions shown as min or max, use the appropriate value specified under recommended operating conditions.
sdas054b ? december 1982 ? revised january 1995 4 post office box 655303 ? dallas, texas 75265 post office box 1443 ? houston, texas 77251?1443 parameter measurement information series 54als/74als and 54as/74as devices t phz t plz t phl t plh 0.3 v t pzl t pzh t plh t phl load circuit for 3-state outputs from output under test test point r1 s1 c l (see note a) 7 v 1.3 v 1.3 v 1.3 v 3.5 v 3.5 v 0.3 v 0.3 v t h t su voltage waveforms setup and hold times timing input data input 1.3 v 1.3 v 3.5 v 3.5 v 0.3 v 0.3 v high-level pulse low-level pulse t w voltage waveforms pulse durations input out-of-phase output (see note c) 1.3 v 1.3 v 1.3 v 1.3 v 1.3 v 1.3 v 1.3 v 1.3 v 1.3 v 1.3 v 3.5 v 3.5 v 0.3 v 0.3 v v ol v oh v oh v ol output control (low-level enabling) waveform 1 s1 closed (see note b) waveform 2 s1 open (see note b) 0 v v oh v ol 3.5 v in-phase output 0.3 v 1.3 v 1.3 v voltage waveforms propagation delay times voltage waveforms enable and disable times, 3-state outputs r2 v cc r l test point from output under test c l (see note a) load circuit for open-collector outputs load circuit for bi-state totem-pole outputs from output under test test point c l (see note a) r l r l = r1 = r2 notes: a. c l includes probe and jig capacitance. b. 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. c. when measuring propagation delay items of 3-state outputs, switch s1 is open. d. all input pulses have the following characteristics: prr 1 mhz, t r = t f = 2 ns, duty cycle = 50%. e. the outputs are measured one at a time with one transition per measurement. figure 1. load circuits and voltage waveforms
important notice texas instruments incorporated and its subsidiaries (ti) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. all products are sold subject to ti?s terms and conditions of sale supplied at the time of order acknowledgment. ti warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with ti?s standard warranty. testing and other quality control techniques are used to the extent ti deems necessary to support this warranty. except where mandated by government requirements, testing of all parameters of each product is not necessarily performed. ti assumes no liability for applications assistance or customer product design. customers are responsible for their products and applications using ti components. to minimize the risks associated with customer products and applications, customers should provide adequate design and operating safeguards. ti does not warrant or represent that any license, either express or implied, is granted under any ti patent right, copyright, mask work right, or other ti intellectual property right relating to any combination, machine, or process in which ti products or services are used. information published by ti regarding third-party products or services does not constitute a license from ti to use such products or services or a warranty or endorsement thereof. use of such information may require a license from a third party under the patents or other intellectual property of the third party, or a license from ti under the patents or other intellectual property of ti. reproduction of ti information in ti data books or data sheets is permissible only if reproduction is without alteration and is accompanied by all associated warranties, conditions, limitations, and notices. reproduction of this information with alteration is an unfair and deceptive business practice. ti is not responsible or liable for such altered documentation. information of third parties may be subject to additional restrictions. resale of ti products or services with statements different from or beyond the parameters stated by ti for that product or service voids all express and any implied warranties for the associated ti product or service and is an unfair and deceptive business practice. ti is not responsible or liable for any such statements. ti products are not authorized for use in safety-critical applications (such as life support) where a failure of the ti product would reasonably be expected to cause severe personal injury or death, unless officers of the parties have executed an agreement specifically governing such use. buyers represent that they have all necessary expertise in the safety and regulatory ramifications of their applications, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any use of ti products in such safety-critical applications, notwithstanding any applications-related information or support that may be provided by ti. further, buyers must fully indemnify ti and its representatives against any damages arising out of the use of ti products in such safety-critical applications. ti products are neither designed nor intended for use in military/aerospace applications or environments unless the ti products are specifically designated by ti as military-grade or "enhanced plastic." only products designated by ti as military-grade meet military specifications. buyers acknowledge and agree that any such use of ti products which ti has not designated as military-grade is solely at the buyer's risk, and that they are solely responsible for compliance with all legal and regulatory requirements in connection with such use. ti products are neither designed nor intended for use in automotive applications or environments unless the specific ti products are designated by ti as compliant with iso/ts 16949 requirements. buyers acknowledge and agree that, if they use any non-designated products in automotive applications, ti will not be responsible for any failure to meet such requirements. following are urls where you can obtain information on other texas instruments products and application solutions: products applications amplifiers amplifier.ti.com audio www.ti.com/audio data converters dataconverter.ti.com automotive www.ti.com/automotive dlp? products www.dlp.com broadband www.ti.com/broadband dsp dsp.ti.com digital control www.ti.com/digitalcontrol clocks and timers www.ti.com/clocks medical www.ti.com/medical interface interface.ti.com military www.ti.com/military logic logic.ti.com optical networking www.ti.com/opticalnetwork power mgmt power.ti.com security www.ti.com/security microcontrollers microcontroller.ti.com telephony www.ti.com/telephony rfid www.ti-rfid.com video & imaging www.ti.com/video rf/if and zigbee? solutions www.ti.com/lprf wireless www.ti.com/wireless mailing address: texas instruments, post office box 655303, dallas, texas 75265 copyright ? 2009, texas instruments incorporated
|
