description 2.5ghz min f max 2.3v to 5.7v power supply provides for any logic function of 2 variables provides for 2-input muxing fully differential source terminated cml outputs for fast edge rates accepts lvds, pecl, pecl, cml, ttl, lvpecl, input logic levels available in a tiny 10-pin msop the SY55851U is a highly flexible, universal logic gate capable of upto 2.5ghz operation. it? differential inputs and outputs will produce any of 9 possible logic functions of two boolean variables. it can be configured as any of the following gates: and, nand, or, nor, xor, xnor, delay, negation (not). also, the SY55851U can function as a 2-input multiplexer. SY55851U inputs can be terminated with a single resistor between the true and the complement pins of a given input. the SY55851U is a member of micrel? new super- lite family of high-speed logic devices. this family features very small packaging, high signal integrity, and operation at many different supply voltages. features anygate cml logic chip superlite SY55851U applications port bypass data communication systems wireless communication systems telecom systems pin configuration functional block diagram 1 rev.: b amendment: /0 issue date: august 2000 s 0 1 a b s q pin names pin function a, /a input data b, /b input data q, /q output data s, /s input selector gnd ground v cc v cc s/sa/agnd vcc /b b q /q 76 45 1 10 98 23 851u anygate and superlite are trademarks of micrel, inc.
2 superlite SY55851U micrel pin descriptions a, /a cml input (differential) this is one of the inputs to the logic block. for a 2- variable logic function, it is either a constant value or a boolean input. for a 2-input mux, this signal represents the output when s is set to logic zero. b, /b cml input (differential) this is one of the inputs to the logic block. for a 2- variable logic function, it is either a constant value or a boolean input. for a 2-input mux, this signal represents the output when s is set to logic one. q, /q cml output (differential) this is the output of the logic block. s, /s cml input (differential) this is one of the inputs to the logic block. it represents either one boolean input for a 2-variable logic function, or the select input for a 2-input mux. functional description v cc nc x /x figure 1. hard wiring a logic 1 (1) nc v cc > 3.0v nc x /x nc v cc 3.0v vcc x /x 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. 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 a, b, s input. /x is either /a, /b, /s input.
3 superlite SY55851U micrel |() abs q /q lhl l h lhhh l hll h l hlh l h | + ( + ) abs q /q lhl l h hhl h l lhhh l hhh h l abs q /q lxl l h hxl h l truth tables and/nand q /q s /s a /a b /b nc ? ( ? ) nc or/nor q /q s /s a /a b /b + ( + ) v cc nc xor/xnor q /q s /s a /a b /b ( ) delay/negation q /q s a /b /s b /a nc nc || abs q /q xlhl h xhhh l q /q s a /b /s b /a v cc nc |?(?) abs q /q lll l h lhl l h llhl h lhhh l q s a b 0 1 sq hb la 2:1 mux
4 superlite SY55851U micrel symbol rating value unit v cc power supply voltage 0.5 to +6.0 v v i input voltage 0.5 to v cc +0.5 v v o cml output voltage v cc 1.0 to v cc +0.5 v t a operating temperature range 40 to +85 c t store storage temperature range 65 to +150 c 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. cml termination 100 ? 100 ? 100 ? 100 ? SY55851U v cc v cc 100 ? 50 ? 50 ? 8ma figure 3a. differentially terminated (50 ? load cml output) 100 ? 100 ? 100 ? 50 ? SY55851U 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. SY55851U expects the inputs to be terminated, and that good high speed design practices be adhered to. SY55851U 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 ? SY55851U v cc 8ma 100 ? 100 ? figure 4. 100 ? load cml output
5 superlite SY55851U micrel 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 0.700 v no load v os output voltage swing (2) 0.700 0.800 0.950 v no load 0.400 100 ? environment (4) 0.200 50 ? environmnet (3) 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 (1) notes: 1. equilibrium temperature. 2. actual voltage levels and differential swing will depend on customer termination scheme. typically, a 400mv swing is availabl e in the 100 ? environment and a 200mv swing in the 50 ? environment. refer to the cml termination diagram for more details. 3. see figure 3a and 3b. 4. see figure 4. symbol parameter min. typ. max. unit condition (1) f max max. operating frequency 2.5 ghz t pin0 propagation delay, 350 ps s to q t pin1 propagation delay, 350 ps a to q t pin2 propagation delay, 350 ps b to q t r cml output rise/fall times tbd 110 ps t f (20% to 80%) ac electrical characteristics v cc = 2.3v to 5.7v; gnd = 0v; t a = 40 c to +85 c 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 ma i cc power supply current 40 40 40 40 ma dc electrical characteristics v cc = 2.3v to 5.7v; gnd = 0v product ordering code ordering package operating code type range SY55851Ukc k10-1 commercial note: 1. tested using environment of figure 3b, 50 ? load cml output.
6 superlite SY55851U micrel 10 lead msop (k10-1) rev. 00
7 superlite SY55851U micrel
8 superlite SY55851U micrel micrel-synergy 3250 scott boulevard santa clara ca 95054 usa tel + 1 (408) 980-9191 fax + 1 (408) 914-7878 web http://www.synergysemi.com 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. ? 2000 micrel incorporated
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