1 description guaranteed ac parameters over temperature: ? max > 160mhz (ttl) < 5.5ns pecl-to-ttl propagation delay < 1.5ns t r /t f ; pecl output < 1.3ns ttl-to-pecl propagation delay wide temperature range: ?0 c to +85 c 5v power supply q ttl output will default low with inputs left open or < 1.3v q ecl output will default high with inputs left open internal pecl input pulldown resistors available in 8-pin msop and soic packages the sy10/100elt28 is a differential pecl-to-ttl translator and a ttl-to-differential pecl translator in a single package. because pecl (positive ecl) levels are used, only +5v and ground are required. the small outline 8-pin package and the dual translation design of the elt28 makes it ideal for applications which are sending and receiving signals across a backplane. features pin configuration/block diagram pin names 5v ttl-to-differential pecl and differential pecl-to-ttl translator 1 decl /decl qecl /qecl 8vcc qttl dttl gnd 7 6 5 2 3 4 pecl ttl top view (available in msop or soic package) pin function dttl ttl inputs qttl ttl outputs decl, /decl pecl differential inputs qecl, /qecl pecl differential outputs v cc positive supply gnd ground rev.: a amendment: /0 issue date: august 2001 sy10elt28 sy100elt28
2 sy10elt28 sy100elt28 micrel symbol rating value unit v cc power supply voltage ?.5 to +7.0 v v in input voltage 0 to +6.0 v i out pecl output current ?ontinuous 50 ma ?urge 100 t a operating temperature range ?0 to +85 c t store storage temperature range ?5 to +150 c ja package thermal resistance ?till-air (soic) 160 c/w (junction-to-ambient) ?00lfpm (soic) 109 ?till-air (msop) 206 c/w ?00lfpm (msop) 155 jc package thermal resistance (soic) 39 c/w (junction-to-case) (msop) 39 absolute maximum ratings (1) t a = ?0 ct a = +25 ct a = +85 c symbol parameter min. typ. max. min. typ. max. min. typ. max. unit condition v cc power supply voltage 4.75 5.0 5.5 4.75 5.0 5.5 4.75 5.0 5.5 v i cc power supply current 23 40 22 40 25 40 ma c in input capacitance (soic) 0.75 pf (msop) 1.1 pf dc electrical characteristics (1) v cc = +5v 10%; v ee = 0v note: 1. 10/100kelt circuits are designed to meet the dc specifications shown in the above table after thermal equilibrium has been es tablished. the circuit is in a test socket or mounted on a printed circuit board and traverse airflow greater than 500lfpm is maintained. input and outpu t parameters vary 1:1 with v cc . v cc can vary 0.25v. t a = ?0 ct a = +25 ct a = +85 c symbol parameter min. typ. max. min. typ. max. min. typ. max. unit condition v oh output high voltage 3920 4010 4110 4020 4105 4190 4090 4185 4280 mv 50 ? v cc ?v v ol output low voltage 3050 3200 3350 3050 3210 3370 3050 3227 3405 mv 50 ? v cc ?v v ih input high voltage 3770 4110 3870 4190 3940 4280 mv (single-ended) v il input low voltage 3050 3500 3050 3520 3050 3555 mv (single-ended) v ihcmr input high voltage 1.2 v cc 1.2 v cc 1.2 v cc mv common mode range (2) 10k pecl dc electrical characteristics (1) v cc = +5.0v 10% notes: 1. 10/100kelt circuits are designed to meet the dc specifications shown in the above table after thermal equilibrium has been es tablished. the circuit is in a test socket or mounted on a printed circuit board and traverse airflow greater than 500lfpm is maintained. 2. v ihcmr (min) varies 1:1 with gnd, v ihcmr (max) varies 1:1 with v cc . note: 1. permanent device damage may occur if absolute maximum ratings are exceeded. this is a stress rating only and functional oper ation is not implied at conditions other than those detailed in the operational sections of this data sheet. exposure to absolute maximum ratlng co nditions for extended periods may affect device reliability.
3 sy10elt28 sy100elt28 micrel t a = ?0 ct a = +25 ct a = +85 c symbol parameter min. typ. max. min. typ. max. min. typ. max. unit condition v oh output high voltage 3915 3995 4120 3975 4045 4120 3975 4050 4120 mv 50 ? v cc ?v v ol output low voltage 3170 3305 3445 3190 3295 3380 3190 3295 3380 mv 50 ? v cc ?v v ih input high voltage 3835 4120 3835 4120 3835 4120 mv (single-ended) v il input low voltage 3190 3525 3190 3525 3190 3525 mv (single-ended) v ihcmr input high voltage 2.2 v cc 2.2 v cc 2.2 v cc v common mode range (2) 100k pecl dc electrical characteristics (1) v cc = +5.0v 10% notes: 1. 10/100kelt circuits are designed to meet the dc specifications shown in the above table after thermal equilibrium has been es tablished. the circuit is in a test socket or mounted on a printed circuit board and traverse airflow greater than 500lfpm is maintained. 2. v ihcmr (min) varies 1:1 with gnd, v ihcmr (max) varies 1:1 with v cc . t a = ?0 ct a = +25 ct a = +85 c symbol parameter min. typ. max. min. typ. max. min. typ. max. unit condition i ih input high current 10 20 20 20 a v in = 2.7v 100 100 100 a v in = v cc i il input low current ?00 ?00 ?00 a v in = 0.5v v ih input high voltage 2.0 2.0 2.0 v v il input low voltage 0.8 0.8 0.8 v v ik input clamp diode voltage ?.2 ?.2 ?.2 v i ik = ?8ma v oh output high voltage 2.4 2.9 2.4 3.4 2.4 3.9 v i oh = ?.0ma v ol output low voltage 0.29 0.5 0.26 0.5 0.27 0.5 v i ol = 24ma i osc output short-circuit current ?75 ?0 ?75 ?0 ?75 ?0 a v o = 0v ttl dc electrical characteristics (1) v cc = +5.0v 10% notes: 1. 10/100kelt circuits are designed to meet the dc specifications shown in the above table after thermal equilibrium has been es tablished. the circuit is in a test socket or mounted on a printed circuit board and traverse airflow greater than 500lfpm is maintained.
4 sy10elt28 sy100elt28 micrel product ordering code ordering package operating package code type range marking sy10elt28zi z8-1 industrial xel28 sy10elt28zitr* z8-1 industrial xel28 SY100ELT28ZI z8-1 industrial xel28 SY100ELT28ZItr* z8-1 industrial xel28 notes: 1. f max is defined as the maximum toggle frequency. 2. v pp (min) is the minimum input swing for which ac parameters are guaranteed. 3. see ?iming waveform. timing waveform q(0:9) /q(0:9) 150mv to 1200mv t a = ?0 ct a = +25 ct a = +85 c symbol parameter min. typ. max. min. typ. max. min. typ. max. unit condition f max maximumfrequency (1) pecl 700 700 700 mhz ttl 160 160 160 mhz t plh propagation dec l ? qttl 1.5 5.5 1.5 5.5 1.5 5.5 ns c l = 20pf delay dttl ? qecl 0.2 1.2 0.2 1.2 1.5 0.2 1.35 ns 50 ? tov cc 2v t phl propagation dec l ? qttl 1.5 5.5 1.5 5.5 1.5 5.5 ns c l = 20pf delay dttl ? qecl 0.2 1.2 0.2 1.2 1.5 0.2 1.35 ns 50 ? tov cc 2v v pp pecl input voltageswing (2) 200 800 1000 200 800 1000 200 800 1000 mv (single-ended) (3) t r qecl output rise/fall times 0.15 1.5 0.15 0.3 1.5 0.15 1.5 ns 50 ? to t f (20% to 80%) v cc 2v qttl output rise/fall times c l = 20pf; (10% to 90%) ttl 1.0 0.80 0.7 ns ttl output ac electrical characteristics v cc = +5.0v 10% ordering package operating package code type range marking sy10elt28ki k8-1 industrial xl28 sy10elt28kitr* k8-1 industrial xl28 sy100elt28ki k8-1 industrial xl28 sy100elt28kitr* k8-1 industrial xl28 *tape and reel
5 sy10elt28 sy100elt28 micrel termination recommendations r2 130 ? r2 130 ? z o = 50 ? z o = 50 ? +5.0v +5.0v v t = v cc 2 v r1 82 ? r1 82 ? +5.0v figure 1. +5v pecl parallel termination?hevenin equivalent z = 50 ? z = 50 ? 50 ? 50 ? +5.0v +5.0v source destination r b figure 2. +5v pecl three-resistor ??ermination notes: 1. power-saving alternative to 4-resistor, thevenin termination. 2. place termination resistors as close to destination inputs as possible. 3. r b resistor sets the dc bias voltage, equal to v t . for 5.0v supply, r b value is 110 ? .
6 sy10elt28 sy100elt28 micrel 8 lead msop (k8-1) rev. 01
7 sy10elt28 sy100elt28 micrel 8 lead soic .150" wide (z8-1) rev. 03 micrel-synergy 3250 scott boulevard santa clara ca 95054 usa tel + 1 (408) 980-9191 fax + 1 (408) 914-7878 web http://www.micrel.com this information is believed to be accurate and reliable, however no responsibility is assumed by micrel for its use nor for an y infringement of patents or other rights of third parties resulting from its use. no license is granted by implication or otherwise under any patent or pat ent right of micrel inc. ? 2001 micrel incorporated
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