? semiconductor components industries, llc, 2001 august, 2001 rev. 0 1 publication order number: 74fst3345/d 74fst3345 8-bit bus switch the on semiconductor 74fst3345 is an 8bit, high performance switch. the device is cmos ttl compatible when operating between 4 and 5.5 volts. the device exhibits extremely low r on and adds nearly zero propagation delay. the device adds no noise or ground bounce to the system. the device consists of an 8bit switch with two output/enable pins (oe and oe ). ? r on 4 typical ? less than 0.25 nsmax delay through switch ? nearly zero standby current ? no circuit bounce ? control inputs are ttl/cmos compatible ? pinforpin compatible with qs3345, fst3345, cbt3345 ? all popular packages: qsop20, tssop20, soic20 oe a 2 a 5 a 4 a 3 a 1 a 0 v cc b 1 b 4 b 3 b 2 b 0 oe 1 2 3 4 5 6 7 20 19 18 17 16 15 14 figure 1. 20lead pinout a 6 8 a 7 9 gnd 10 b 5 13 b 6 12 b 7 11 oe x inputs h l oe l x h connect connect function truth table disconnect 9 1 11 oe figure 2. logic diagram a 7 b 7 218 a 0 b 0 19 oe description pin names oe 1 , oe 2 1a, 2a http://onsemi.com device package shipping ordering information 74fst3345dw so20 38 units/rail 74fst3345dwr2 so20 74fst3345dt tssop20 1000 units/reel 75 units/rail 74fst3345dtr2 tssop20 2500 units/reel 74fst3345qs qsop20 55 units/rail 74fst3345qsr qsop20 2500 units/reel tssop20 dt suffix case 948e so20 dw suffix case 751d 20 marking diagrams pin bus switch enables bus a 1b, 2b bus b 20 1 1 fst3345 awlyyww 1 20 20 1 fst 3345 alyw a = assembly location l, wl = wafer lot y = year w, ww = work week qsop20 qs suffix case 492a 1 20 fst3345 awlyww 20 1
74fst3345 http://onsemi.com 2 maximum ratings symbol parameter value unit v cc dc supply voltage 0.5 to 7.0 v v i dc input voltage 0.5 to 7.0 v v o dc output voltage 0.5 to 7.0 v i ik dc input diode current v i gnd 50 ma i ok dc output diode current v o gnd 50 ma i o dc output sink current 128 ma i cc dc supply current per supply pin 100 ma i gnd dc ground current per ground pin 100 ma t stg storage temperature range 65 to 150 c t l lead temperature, 1 mm from case for 10 seconds 260 c t j junction temperature under bias 150 c ja thermal resistance (note 1) soic tssop qsop 96 128 200 c/w msl moisture sensitivity level 1 f r flammability rating oxygen index: 28 to 34 ul 94 v0 @ 0.125 in v esd esd withstand voltage human body model (note 2) machine model (note 3) 2000 200 v i latchup latchup performance above v cc and below gnd at 85 c (note 4) 500 ma maximum ratings are those values beyond which damage to the device may occur. exposure to these conditions or conditions beyond those indicated may adversely affect device reliability. functional operation under absolute maximumrated conditions is not implied. functional operation should be restricted to the recommended operating conditions. 1. measured with minimum pad spacing on an fr4 board, using 10 mmby1 inch, 2ounce copper trace with no air flow. 2. tested to eia/jesd22a114a. 3. tested to eia/jesd22a115a. 4. tested to eia/jesd78. recommended operating conditions symbol parameter min max unit v cc supply voltage operating, data retention only 4.0 5.5 v v i input voltage (note ) 0 5.5 v v o output voltage (high or low state) 0 v cc v t a operating freeair temperature 40 85 c t/ v input transition rise or fall rate switch control input switch i/o 0 0 5 dc ns/v 5. unused control inputs may not be left open. all control inputs must be tied to a high or low logic input voltage level.
74fst3345 http://onsemi.com 3 dc electrical characteristics v cc t a = 40 c to 85 c symbol parameter conditions (v) min typ* max unit v ik clamp diode resistance i in = 18ma 4.5 1.2 v v ih highlevel input voltage 4.0 to 5.5 2.0 v v il lowlevel input voltage 4.0 to 5.5 0.8 v i i input leakage current 0 v in 5.5 v 5.5 1.0 a i oz offstate leakage current 0 a, b v cc 5.5 1.0 a r on switch on resistance (note 6) v in = 0 v, i in = 64 ma 4.5 4 7 v in = 0 v, i in = 30 ma 4.5 4 7 v in = 2.4 v, i in = 15 ma 4.5 8 15 v in = 2.4 v, i in = 15 ma 4.0 11 20 i cc quiescent supply current v in = v cc or gnd, i out = 0 5.5 3 a i cc increase in i cc per input one input at 3.4 v, other inputs at v cc or gnd 5.5 2.5 ma *typical values are at v cc = 5.0 v and t a = 25 c. 6. measured by the voltage drop between a and b pins at the indicated current through the switch. ac electrical characteristics limits t a = 40 c to 85 c v cc = 4.5 to 5.5 v v cc = 4.0 v symbol parameter conditions figures min max min max unit t phl , t plh prop delay bus to bus (note 7) v i = open 3 and 4 0.25 0.25 ns t pzh , t pzl output enable time v i = 7 v for t pzl v i = open for t pzh 3 and 4 1.5 6.5 7.0 ns t phz , t plz output disable time v i = 7 v for t plz v i = open for t phz 3 and 4 1.0 8.0 8.2 ns 7. this parameter is guaranteed by design but is not tested. the bus switch contributes no propagation delay other than the rc d elay of the typical on resistance of the switch and the 50 pf load capacitance, when driven by an ideal voltage source (zero output impedan ce). capacitance (note 8) symbol parameter conditions typ max unit c in control pin input capacitance v cc = 5.0 v 3 pf c i/o input/output capacitance v cc , oe = 5.0 v 5 pf 8. t a = 25 c, f = 1 mhz, capacitance is characterized but not tested.
74fst3345 http://onsemi.com 4 v i v ol v ol + 0.3 v t plh t plh v ol v oh v oh 0.3 v t phzl t f = 2.5 ns 90 % 1.5 v 10 % 10 % 1.5 v 90 % t f = 2.5 ns t pzl t pzl output 1.5 v output 1.5 v gnd 3.0 v t pzh enable input t f = 2.5 ns 90 % 1.5 v 1.5 v 90 % 10 % 10 % 1.5 v 1.5 v v oh gnd 3.0 v switch input t f = 2.5 ns c l * from output under test figure 3. ac test circuit figure 4. propagation delays ac loading and waveforms notes: 1. input driven by 50 source terminated in 50 . 2. cl includes load and stray capacitance. *c l = 50 pf 500 500 figure 5. enable/disable delays output
74fst3345 http://onsemi.com 5 package dimensions so20 d suffix case 751d05 issue f 20 1 11 10 b 20x h 10x c l 18x a1 a seating plane h x 45 e d m 0.25 m b m 0.25 s a s b t e t b a dim min max millimeters a 2.35 2.65 a1 0.10 0.25 b 0.35 0.49 c 0.23 0.32 d 12.65 12.95 e 7.40 7.60 e 1.27 bsc h 10.05 10.55 h 0.25 0.75 l 0.50 0.90 0 7 notes: 1. dimensions are in millimeters. 2. interpret dimensions and tolerances per asme y14.5m, 1994. 3. dimensions d and e do not include mold protrusion. 4. maximum mold protrusion 0.15 per side. 5. dimension b does not include dambar protrusion. allowable protrusion shall be 0.13 total in excess of b dimension at maximum material condition.
74fst3345 http://onsemi.com 6 package dimensions tssop20 dt suffix case 948e02 issue a dim a min max min max inches 6.60 0.260 millimeters b 4.30 4.50 0.169 0.177 c 1.20 0.047 d 0.05 0.15 0.002 0.006 f 0.50 0.75 0.020 0.030 g 0.65 bsc 0.026 bsc h 0.27 0.37 0.011 0.015 j 0.09 0.20 0.004 0.008 j1 0.09 0.16 0.004 0.006 k 0.19 0.30 0.007 0.012 k1 0.19 0.25 0.007 0.010 l 6.40 bsc 0.252 bsc m 0 8 0 8 notes: 1. dimensioning and tolerancing per ansi y14.5m, 1982. 2. controlling dimension: millimeter. 3. dimension a does not include mold flash, protrusions or gate burrs. mold flash or gate burrs shall not exceed 0.15 (0.006) per side. 4. dimension b does not include interlead flash or protrusion. interlead flash or protrusion shall not exceed 0.25 (0.010) per side. 5. dimension k does not include dambar protrusion. allowable dambar protrusion shall be 0.08 (0.003) total in excess of the k dimension at maximum material condition. 6. terminal numbers are shown for reference only. 7. dimension a and b are to be determined at datum plane -w-. 110 11 20 pin 1 ident a b t 0.100 (0.004) c d g h section nn k k1 jj1 n n m f w seating plane v u s u m 0.10 (0.004) v s t 20x ref k l l/2 2x s u 0.15 (0.006) t detail e 0.25 (0.010) detail e 6.40 0.252 --- --- s u 0.15 (0.006) t
74fst3345 http://onsemi.com 7 package dimensions qsop20 qs suffix case 492a01 issue o min millimeters g r b a l m 0.25 (0.010) t u t seating plane k d 20 pl c m 0.25 (0.010) t ba s s v n m f 8 pl detail e detail e h x 45 rad. mold pin dim max min max inches a 8.56 8.74 0.337 0.344 b 3.81 3.99 0.150 0.157 c 1.55 1.73 0.061 0.068 d 0.20 0.31 0.008 0.012 f 0.41 0.89 0.016 0.035 g 0.64 bsc 0.025 bsc h 0.20 0.46 0.008 0.018 j 0.249 0.191 0.0098 0.0075 k 0.10 0.25 0.004 0.010 l 5.84 6.20 0.230 0.244 m 0 8 0 8 n 0 7 0 7 p 1.32 1.58 0.052 0.062 q 0.89 dia 0.035 dia r 0.89 1.14 0.035 0.045 u 0.89 1.14 0.035 0.045 v notes: 1. dimensioning and tolerancing per ansi y14.5m, 1982. 2. controlling dimension: inch. 3. the bottom package shall be bigger than the top package by 4 mils (note: lead side only). bottom package dimension shall follow the dimension stated in this drawing. 4. plastic dimensions does not include mold flash or protrusions. mold flash or protrusions shall not exceed 6 mils per side. 5. bottom ejector pin will include the country of origin (coo) and mold cavity i.d. 0 8 0 8 mark q p 0.013 x 0.005 dp. max rad. 0.0050.010 typ j
74fst3345 http://onsemi.com 8 on semiconductor and are trademarks of semiconductor components industries, llc (scillc). scillc reserves the right to make changes without further notice to any products herein. scillc makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does scillc assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. atypicalo parameters which may be provided in scill c data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. all operating parameters, including atypicalso must be validated for each customer application by customer's technical experts. scillc does not convey any license under its patent rights nor the rights of others. scillc products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body , or other applications intended to support or sustain life, or for any other application in which the failure of the scillc product could create a sit uation where personal injury or death may occur. should buyer purchase or use scillc products for any such unintended or unauthorized application, buyer shall indemnify and hold scillc and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthori zed use, even if such claim alleges that scillc was negligent regarding the design or manufacture of the part. scillc is an equal opportunity/affirmative action employer. publication ordering information japan : on semiconductor, japan customer focus center 4321 nishigotanda, shinagawaku, tokyo, japan 1410031 phone : 81357402700 email : r14525@onsemi.com on semiconductor website : http://onsemi.com for additional information, please contact your local sales representative. 74fst3345/d literature fulfillment : literature distribution center for on semiconductor p.o. box 5163, denver, colorado 80217 usa phone : 3036752175 or 8003443860 toll free usa/canada fax : 3036752176 or 8003443867 toll free usa/canada email : onlit@hibbertco.com n. american technical support : 8002829855 toll free usa/canada
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