1 superlite sy55854u micrel, inc. m9999-041206 hbwhelp@micrel.com or (408) 955-1690 description guaranteed f max >2.5ghz over temperature 2.3v to 5.7v power supply non-blocking ?witch architecture guaranteed <15ps channel-to-channel skew guaranteed <480ps propagation delay over temperature configurable as 2:1 mux, 1:2 fan-out buffer, dual buffer, or 2 x 2 switch accepts cml, pecl, lvpecl inputs fully differential inputs/outputs source terminated cml outputs for fast edge rates wide operating temperature range: ?0 c to +85 c available in a tiny 16-pin epad-qsop package the sy55854u is a fully differential, cml, 2 x 2- crosspoint switch. the non-blocking design allows any input to be connected to any output. varying the state of the select inputs allows sy55854u to be used in backup, fault tolerant, protection, and backplane distribution applications. sy55854u inputs can be terminated with a single resistor between the true and the complement pins of a given input. the sy55854u is a member of micrel? new superlite family of high-speed logic devices. this family features very small packaging, high signal integrity, and flexible supply voltage operation. features 2 x 2 protection crosspoint switch superlite sy55854u applications high-speed logic data communications systems wireless communications systems telecom systems backplane redundancy functional block diagram rev.: d amendment: /0 issue date: april 2006 superlite is a trademark of micrel, inc. s 0 1 d0 d1 s0 q0 s 0 1 q1 s1 superlite
2 superlite sy55854u micrel, inc. m9999-041206 hbwhelp@micrel.com or (408) 955-1690 package/ordering information ordering information (1) package operating package lead part number type range marking finish sy55854uyi y16-1 industrial 854u sn-pb sy55854uyitr (2) y16-1 industrial 854u sn-pb SY55854UYY (3) y16-1 industrial 854u with nipdau pb-free bar line indicator pb-free SY55854UYYtr (2, 3) y16-1 industrial 854u with nipdau pb-free bar line indicator pb-free notes: 1. contact factory for die availability. dice are guaranteed at t a = 25 c, dc electricals only. 2. tape and reel. 3. pb-free package recommended for new designs. 1 gnd d0 /d0 s0 /s0 /d1 d1 gnd 16 vcc q0 /q0 s1 /s1 /q1 q1 vcc 15 14 13 12 11 10 9 2 3 4 5 6 7 8 qsop 16-pin epad-qsop (y16-1) pin number pin name pin function 2, 3 d0, /d0 cml/pecl/lvpecl input (differential). this is one of the data inputs to the crosspoint. it will be switched either to the q0 output, the q1 output, both outputs, or neither output, depending on the state of the s0 and s1 inputs. 4, 5 s0, /s0 cml/pecl/lvpecl input (differential). this selects input chooses which data input switches to the q0 output. s0 logic low selects the d0 input, while s0 logic high selects the b input. 6, 7 /d1, d1 cml/pecl/lvpecl input (differential). this is the other data input to the crosspoint. it will be switched either to the q0 output, the q1 output, both outputs, or neither output, depending on the state of the s0 and s1 inputs. 1, 8 gnd ground. 9, 16 vcc power supply. 10, 11 q1, /q1 cml output (differential). this is the other output from the crosspoint. input s1 selects either the d0 or d1 input to be switched to this output. 12, 13 /s1, s1 cml/pecl/lvpecl input (differential). this select input chooses which data input switches to the q1 output. s1 logic low selects the d0 input, while s1 logic high selects the d1 input. 14, 15 /q0, q0 cml output (differential). this is one output from the crosspoint. input s0 selects either the d0 or the d1 input to be switched to this output. pin description
3 superlite sy55854u micrel, inc. m9999-041206 hbwhelp@micrel.com or (408) 955-1690 functional description v cc nc x /x figure 1. hard wiring a logic 1 (1) nc nc x /x v cc > 3.0v nc v cc x /x v cc 3.0v figure 2. hard wiring a logic 0 (1) establishing static logic inputs the true pin of an input pair is internally biased to ground through a 75k ? resistor. the complement pin of an input pair is internally biased halfway between v cc and ground by a voltage divider consisting of two 75k ? resistors. in this way, unconnected inputs appear as logic zeros. to keep an input at static logic zero at v cc > 3.0v, leave both inputs unconnected. for v cc 3.0v, connect the complement input to v cc and leave the true input unconnected. to make an input static logic one, connect the true input to v cc , leave the complement input unconnected. these are the only two safe ways to cause inputs to be at a static value. in particular, no input pin should be directly connected to ground. all nc (no connect) pins should be unconnected. note 1. x is either d0, d1, s0, or s1 input. /x is either /d0, /d1, /s0, or /s1 input. usage sy55854u is very versatile. tying its select inputs in various ways varies its functionality. for example, tying the select inputs together turns sy55854u into a redundant distributor. either input will be switched to both outputs simultaneously. this is very useful in redundant backplane applications. by cross-tying the select inputs, sy55854u becomes a true crosspoint, selecting between straight through and cross connected operation. also, using the select inputs independently, sy55854u functions as two multiplexers. setting the select inputs to static values turns sy55854u into a dual buffer, or a fan-out buffer. to make larger crosspoints, cascade sy55854u devices, either in a tree or in a banyan structure, as appropriate for your application.
4 superlite sy55854u micrel, inc. m9999-041206 hbwhelp@micrel.com or (408) 955-1690 cml termination 100 ? 100 ? 100 ? 100 ? sy55854u v cc v cc 100 ? 50 ? 50 ? 8ma figure 3a. differentially terminated (50 ? load cml output) 100 ? 100 ? 100 ? 50 ? sy55854u v cc 50 ? 8ma 50 ? 100 ? 50 ? figure 3b. individually terminated (50 ? load cml output) all inputs accept the output from any other member of this family. all outputs are source terminated 100 ? cml differential drivers as shown in figures 3 and 4. sy55854u expects the inputs to be terminated, and that good high speed design practices be adhered to. sy55854u inputs are designed to accept a termination resistor between the true and complement inputs of a differential pair. 0402 form factor chip resistors will fit with some trace fanout. 100 ? 100 ? 200 ? sy55854u v cc 8ma 100 ? 100 ? figure 4. 100 ? load cml output s0 s1 q0 q1 function 0 0 d0 d0 fan-out buffer 0 1 d0 d1 dual buffer 1 0 d1 d0 dual buffer 1 1 d1 d1 fan-out buffer ctl ctl same same redundant distribution ctl /ctl opposite opposite crosspoint truth table
5 superlite sy55854u micrel, inc. m9999-041206 hbwhelp@micrel.com or (408) 955-1690 t a = 40 ct a = 0 ct a = +25 ct a = +85 c symbol parameter min. max. min. max. min. max. min. max. unit v cc power supply voltage 2.3 5.7 2.3 5.7 2.3 5.7 2.3 5.7 v i cc power supply current 60 60 60 60 ma dc electrical characteristics v cc = 2.3v to 5.7v; gnd = 0v symbol parameter min. typ. max. unit condition v id differential input voltage 100 mv v ih input high voltage 1.6 v cc v v il input low voltage 1.5 v cc 0.1 v v oh output high voltage v cc 0.020 v cc 0.010 v cc v no load v ol output low voltage v cc 0.97 v cc 0.825 v cc 0.660 v no load v os output voltage swing (3) 0.700 0.800 0.950 v no load 0.400 100 ? environment (5) 0.200 50 ? environment (4) r drive output source impedance 80 100 120 ? cml dc electrical characteristics v cc = 2.3v to 5.7v; gnd = 0v; t a = 40 c to +85 c (2) note 2. equilibrium temperature. note 3. actual voltage levels and differential swing will depend on customer termination scheme. typically, a 400mv swing is available in the 100 ? environment and a 200mv swing in the 50 ? environment. refer to the cml termination diagram for more details. note 4. see figure 3a and 3b. note 5. see figure 4. symbol rating value unit v cc power supply voltage 0.5 to +6.0 v v in input voltage 0.5 to v cc +0.5 v v out cml output voltage v cc 1.0 to v cc +0.5 v t a operating temperature range 40 to +85 c t lead lead temperature (soldering, 20 sec.) 260 c c t store storage temperature range 65 to +150 c note 1. permanent device damage may occur if absolute maximum ratings are exceeded. this is a stress rating only and functional operation is not implied at conditions other than those detailed in the operational sections of this data sheet. exposure to a bsolute maximum ratlng conditions for extended periods may affect device reliability. absolute maximum ratings (1)
6 superlite sy55854u micrel, inc. m9999-041206 hbwhelp@micrel.com or (408) 955-1690 symbol parameter min. typ. max. unit condition f max max. operating frequency 2.5 ghz t pd propagation delay, 400 ps s0, s1, d0, d1 to q0, q1 t skew within-device skew (3) 15 ps part-to-part skew (diff.) 100 t r cml output rise/fall times 150 ps t f (20% to 80%) ac electrical characteristics (1, 2) v cc = 2.3v to 5.7v; gnd = 0v; t a = 40 c to +85 c note 1. specification for packaged product only. note 2. tested using environment of figure 3b, 50 ? load cml output. note 3. worst case difference between q0 and q1 from either a or b, when both outputs come from the same input
7 superlite sy55854u micrel, inc. m9999-041206 hbwhelp@micrel.com or (408) 955-1690 16-pin epad-qsop (y16-1) 45 0.2284 (5.801) 0.2240 (5.690) seating plane 0.009 (0.2286) ref 0.012 (0.30) 0.008 (0.20) 0.157 (3.99) 0.150 (3.81) 0.050 (1.27) 0.016 (0.40) 0.0688 (1.748) 0.0532 (1.351) 0.196 (4.98) 0.189 (4.80) 0.025 (0.635) bsc pin 1 dimensions: inches (mm) 0.0098 (0.249) 0.0040 (0.102) 0.0098 (0.249) 0.0075 (0.190) 8 0 micrel, inc. 2180 fortune drive san jose, ca 95131 usa tel + 1 (408) 944-0800 fax + 1 (408) 474-1000 web http://www.micrel.com the information furnished by micrel in this datasheet is believed to be accurate and reliable. however, no responsibility is as sumed by micrel for its use. micrel reserves the right to change circuitry and specifications at any time without notification to the customer. micrel products are not designed or authorized for use as components in life support appliances, devices or systems where malfu nction of a product can reasonably be expected to result in personal injury. life support devices or systems are devices or systems that (a) are intend ed for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant inj ury to the user. a purchaser s use or sale of micrel products for use in life support appliances, devices or systems is at purchaser s own risk and purchaser agrees to fully indemnify micrel for any damages resulting from such use or sale. ? 2006 micrel, incorporated.
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