1 description 3.3v 10% power supply guaranteed ac parameters over temperature: f max > 275mhz (lvttl) < 2ns lvpecl-to-lvttl propagation delay < 600ps lvttl-to-lvpecl propagation delay internal 75k ? input pull-down resistors industrial temperature range: ?0 c to +85 c available in 8-pin msop and soic packages the sy10/100ept28l is a differential lvpecl-to- lvttl translator and a lvttl-to-differential lvpecl translator in a single package. because lvpecl (positive ecl) levels are used, only +3.3v and ground are required. the small outline 8-pin package and the dual translation design of the ept28l makes it ideal for applications which are sending and receiving signals across a backplane. the 100k series includes temperature compensation. thus, logic levels are constant over temperature. features pin configuration/block diagram pin names 3v lvttl-to-differential lvpecl and differential lvpecl-to-lvttl translator 1 d_lvpecl / d_lvpecl q_lvpecl /q-lvpecl 8 vcc q_lvttl d_lvttl gnd 7 6 5 2 3 4 lvpecl lvttl top view (available in msop or soic package) pin function d_lvttl low voltage ttl input q_lvttl low voltage ttl output d_lvpecl low voltage differential pecl inputs /d_lvpecl with 75k ? internal pull-down q_lvpecl low voltage differential pecl outputs /q_lvpecl v cc 3.3v positive supply gnd ground rev.: a amendment: /0 issue date: august 2001 sy10ept28l sy100ept28l final
2 sy10ept28l sy100ept28l micrel symbol rating value unit v cc power supply voltage ?.5 to +3.8 v v in input voltage 0 to v cc v i out lvpecl output current ?ontinuous 50 mv ?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) 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. 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 3.0 3.3 3.6 3.0 3.3 3.6 3.0 3.3 3.6 v i cc power supply current 20 40 22 40 25 40 ma dc electrical characteristics (1) note: 1. 10/100kept 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. 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 (2) 10ept 2165 2290 2415 2230 2355 2480 2290 2415 2540 mv voltage 100ept 2155 2280 2405 2155 2280 2405 2155 2280 2405 v ol output low (2) 10ept 1365 1490 1615 1430 1555 1680 1490 1615 1740 mv voltage 100ept 1355 1480 1605 1355 1480 1605 1355 1480 1605 v ih input high (2) 10ept 2090 2415 2155 2480 2215 2540 mv voltage 100ept 2075 2420 2075 2420 2075 2420 v il input low (2) 10ept 1365 1690 1430 1755 1490 1815 mv voltage 100ept 1355 1675 1355 1675 1355 1675 i ih input high current 150 150 150 av in = 3.46v i il input low current /d, d 0.5 0.5 0.5 0.5 a c in input capacitance (soic) 0.75 pf (msop) 1.1pf lvpecl dc electrical characteristics (1) v cc = 3.3v 10% notes: 1. 10/100kept 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. input and output parameters vary 1:1 with v cc .
3 sy10ept28l sy100ept28l 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 2.0 2.0 2.0 v i oh = ?ma v ol output low voltage 0.5 0.5 0.5 v i oh = ?4ma 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 voltage ?.2 ?.2 ?.2 v i ik = ?8ma i ih input high current 20 20 20 av in = 2.7v 100 100 100 av in = v cc i il input low current ?.2 ?.2 ?.2 av in = 0.5v i out(sc) lvttl output ?75 ?0 ?75 ?0 ?75 ?0 ma v out = 0v short-circuit current c in input capacitance (soic) 0.75 pf (msop) 1.1 pf lvttl dc electrical characteristics (1) v cc = 3.3v 10% note: 1. 10/100kept 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. note: 1. v pp (min) is the minimum input swing for which ac parameters are guaranteed. 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 maximum frequency output lvpecl 700 700 700 mhz toggle lvttl 275 350 275 350 275 350 mhz frequency t plh propagation delay t phl d_lvpecl ? q_lvttl 1.5 2.5 1.5 2.5 1.5 2.5 ns c l = 20pf q_lvttl ? d_lvpecl 100 400 600 100 400 600 100 400 600 ps 50 ? to v cc ?.0 v cmr lvpecl 1.2 v cc 1.2 v cc 1.2 v cc v common mode range v pp lvpecl input voltage swing 100 100 100 mv (single-ended) (1) lvpecl output rise/fall times 200 500 200 500 200 500 ns 50 ? to v cc ?.0 t r , t f (20% to 80%) lvttl output rise/fall times 0.5 1.0 0.5 1.0 0.5 1.0 ns c l = 20pf (10% to 90%) t dc duty cycle 45 50 55 45 50 55 45 50 55 % t jitter cycle-to-cycle jitter (rms) 0.2 < 1 0.2 < 1 0.2 < 1 ps rms ac electrical characteristics v cc = +3.3v 10%
4 sy10ept28l sy100ept28l micrel termination recommendations r2 82 ? r2 82 ? z o = 50 ? z o = 50 ? +3.3v +3.3v v t = v cc 2 v r1 130 ? r1 130 ? +3.3v figure 1. lvpecl parallel termination?hevenin equivalent z = 50 ? z = 50 ? 50 ? 50 ? +3.3v +3.3v source destination r b figure 2. lvpecl 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 3.3v supply, r b value is between 46 ? to 50 ? . product ordering code ordering package operating package code type range marking sy10ept28lzi z8-1 industrial hep28 sy10ept28lzitr* z8-1 industrial hep28 sy100ept28lzi z8-1 industrial xep28 sy100ept28lzitr* z8-1 industrial xep28 ordering package operating package code type range marking sy10ept28lki k8-1 industrial hp28 sy10ept28lkitr* k8-1 industrial hp28 sy100ept28lki k8-1 industrial xp28 sy100ept28lkitr* k8-1 industrial xp28 *tape and reel
5 sy10ept28l sy100ept28l micrel 8 lead msop (k8-1) rev. 01
6 sy10ept28l sy100ept28l 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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