ds75154 quad line receiver general description the ds75154 is a quad monolithic line receiver designed to satisfy the requirements of the standard interface between data terminal equipment and data communication equipment as defined by eia standard rs-232c. other applications are in relatively short, single-line, point-to-point data transmis- sion systems and for level translators. operation is normally from a single 5v supply; however, a built-in option allows op- eration from a 12v supply without the use of additional com- ponents. the output is compatible with most ttl and ls cir- cuits when either supply voltage is used. in normal operation, the threshold-control terminals are con- nected to the v cc1 terminal, pin 15, even if power is being supplied via the alternate v cc2 terminal, pin 16. this pro- vides a wide hysteresis loop which is the difference between the positive-going and negative-going threshold voltages. in this mode, if the input voltage goes to zero, the output volt- age will remain at the low or high level as determined by the previous input. for fail-safe operation, the threshold-control terminals are open. this reduces the hysteresis loop by causing the negative-going threshold voltage to be above zero. the positive-going threshold voltage remains above zero as it is unaffected by the disposition of the threshold terminals. in the fail-safe mode, if the input voltage goes to zero or an open-circuit condition, the output will go to the high level re- gardless of the previous input condition. features n input resistance, 3 k w to7k w over full rs-232c voltage range n input threshold adjustable to meet afail-safeo requirements without using external components n inverting output compatible with ttl or ls n built-in hysteresis for increased noise immunity n output with active pull-up for symmetrical switching speeds n standard supply voltage e 5v or 12v schematic diagram ds005795-1 note: when using v cc1 (pin 15), v cc2 (pin 16) may be left open or shorted to v cc1 . when using v cc2 ,v cc1 must be left open or connected to the threshold control pins. may 1998 ds75154 quad line receiver ? 1998 national semiconductor corporation ds005795 www.national.com
absolute maximum ratings (note 2) if military/aerospace specified devices are required, please contact the national semiconductor sales office/ distributors for availability and specifications. normal supply voltage (pin 15), (v cc1 )7v alternate supply voltage (pin 16), (v cc2 ) 14v input voltage 25v storage temperature range ?65c to +150c maximum power dissipation (note 1) at 25c so package 650 mw lead temperature (soldering, 4 seconds) 260c operating conditions min max units supply voltage (pin 15), (v cc1 ) 4.5 5.5 v alternate supply voltage (pin 16), (v cc2 ) 10.8 13.2 v input voltage 15 v temperature, (t a ) 0 +70 c note 1: derate molded dip package 10.9 mw/c above 25c; derate so package 8.01 mw/c above 25c. electrical characteristics (notes 3, 4, 5) symbol parameter conditions min typ max units v ih high-level input voltage ( figure 1 )3v v il low-level input voltage ( figure 1 )?3v v t+ positive-going threshold voltage ( figure 1 ) normal operation 0.8 2.2 3 v fail-safe operation 0.8 2.2 3 v v t? negative-going threshold voltage ( figure 1 ) normal operation ?3 ?1.1 0 v fail-safe operation 0.8 1.4 3 v v t+ ?v t? hysteresis ( figure 1 ) normal operation 0.8 3.3 6 v fail-safe operation 0 0.8 2.2 v v oh high-level output voltage i oh = ?400 a, ( figure 1 ) 2.4 3.5 v v ol low-level output voltage i ol = 16 ma, ( figure 1 ) 0.23 0.4 v r i input resistance ( figure 2 ) d v i = ?25v to ?14v 3 5 7 k w d v i = ?14v to ?3v 3 5 7 k w d v i = ?3v to +3v 3 6 k w d v i = 3v to 14v 3 5 7 k w d v i = 14v to 25v 3 5 7 k w v i(open) open-circuit input voltage i i = 0, ( figure 3 ) 0 0.2 2 v i os short-circuit output current v cc1 = 5.5v, v i = ?5v, ( figure 4 ) ?10 ?20 ?40 ma (note 6) i cc1 supply current from v cc1 v cc1 = 5.5v, t a = 25c, ( figure 5 )2035ma i cc2 supply current from v cc2 v cc2 = 13.2v, t a = 25c, ( figure 5 )2340ma switching characteristics (v cc1 = 5v, t a = 25c) symbol parameter conditions min typ max units t plh propagation delay time, low-to-high c l = 50 pf, r l = 390 w ,( figure 6 )22 ns level output t phl propagation delay time, high-to-low c l = 50 pf, r l = 390 w ,( figure 6 )20 ns level output t tlh transition time, low-to-high level c l = 50 pf, r l = 390 w ,( figure 6 )9 ns output t thl transition time, high-to-low level c l = 50 pf, r l = 390 w ,( figure 6 )6 ns output note 2: aabsolute maximum ratingso are those values beyond which the safety of the device cannot be guaranteed. except for aoperating temperature rangeo the y are not meant to imply that the devices should be operated at these limits. the table of aelectrical characteristicso provides conditions for actual d evice operation. note 3: unless otherwise specified min/max limits apply across the 0c to +70c range for the ds75154. all typical values are for t a = 25c and v cc1 = 5v. note 4: all currents into device pins shown as positive, out of device pins as negative, all voltages referenced to ground unless otherwise noted. all values s hown as max or min on absolute value basis. www.national.com 2
switching characteristics (continued) note 5: the algebraic convention where the most-positive (least-negative) limit is designated as maximum is used in this data sheet for logic and threshold l evels only, e.g., when ?3v is the maximum, the minimum limit is a more-negative voltage. note 6: only one output at a time should be shorted. typical performance characteristics connection diagram output voltage vs input voltage ds005795-10 dual-in-line package ds005795-2 top view order number ds75154m see ns package number m16a www.national.com 3
dc test circuits and truth tables ds005795-3 test measure a t y v cc1 v cc2 (pin 15) (pin 16) open-circuit input v oh open open i oh 4.5v open (fail-safe) v oh open open i oh open 10.8v v t+ min, v oh 0.8v open i oh 5.5v open v t? (fail-safe) v oh 0.8v open i oh open 13.2v v t+ min (normal) v oh (note 7) pin 15 i oh 5.5v and t open v oh (note 7) pin 15 i oh t 13.2v v il max, v oh ?3v pin 15 i oh 5.5v and t open v t? min (normal) v oh ?3v pin 15 i oh t 13.2v v ih min, v t+ max, v ol 3v open i ol 4.5v open v t? max (fail-safe) v ol 3v open i ol open 10.8v v ih min, v t+ max, v ol 3v pin 15 i ol 4.5v and t open (normal) v ol 3v pin 15 i ol t 10.8v v t? max (normal) v ol (note 8) pin 15 i ol 5.5v and t open v ol (note 8) pin 15 i ol t 13.2v note 7: momentarily apply ?5v, then 0.8v. note 8: momentarily apply 5v, then ground. figure 1. v ih ,v il ,v t+ ,v t? ,v oh ,v ol www.national.com 4
dc test circuits and truth tables (continued) ds005795-4 tv cc1 v cc2 (pin 15) (pin 16) open 5v open open gnd open open open open pin 15 t and 5v open gnd gnd open open open 12v open open gnd pin 15 t 12v pin 15 t gnd pin 15 t open figure 2. r i ds005795-5 tv cc1 v cc2 (pin 15) (pin 16) open 5.5v open pin 15 5.5v open open open 13.2v pin 15 t 13.2v figure 3. v i(open) www.national.com 5
dc test circuits and truth tables (continued) ac test circuit and switching time waveforms ds005795-6 each output is tested separately. figure 4. i os ds005795-7 all four line receivers are tested simultaneously. figure 5. i cc ds005795-8 note 1: the pulse generator has the following characteristics: z out =50 w ,t w = 200 ns, duty cycle 20 % . note 2: c l includes probe and jig capacitance. ds005795-9 figure 6. www.national.com 6
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physical dimensions inches (millimeters) unless otherwise noted life support policy national's products are not authorized for use as critical components in life support de- vices or systems without the express written approval of the president of national semi- conductor corporation. as used herein: 1. life support devices or systems are devices or sys- tems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose fail- ure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 2. a critical component in any component of a life support device or system whose failure to perform can be rea- sonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. national semiconductor corporation americas tel: 1-800-272-9959 fax: 1-800-737-7018 email: support@nsc.com www.national.com national semiconductor europe fax: +49 (0) 1 80-530 85 86 email: europe.support@nsc.com deutsch tel: +49 (0) 1 80-530 85 85 english tel: +49 (0) 1 80-532 78 32 fran?ais tel: +49 (0) 1 80-532 93 58 italiano tel: +49 (0) 1 80-534 16 80 national semiconductor asia pacific customer response group tel: 65-2544466 fax: 65-2504466 email: sea.support@nsc.com national semiconductor japan ltd. tel: 81-3-5620-6175 fax: 81-3-5620-6179 so package (m) order number ds75154m ns package number m16a ds75154 quad line receiver national does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and national reserves the righ t at any time without notice to change said circuitry and specifications.
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