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march 2010 doc id 11932 rev 3 1/15 15 stg3856 low voltage 1.0 max dual sp3t switch with break-before-make feature features high speed: ?t pd = 0.3 ns (typ.) at v cc =3.0v ?t pd = 0.4 ns (typ.) at v cc =2.3v ultra low power dissipation: ?i cc =0.2 a (max.) at t a =85c low on resistance v in =0v: ?r on =1.0 (max. t a =25c) at v cc =4.3v ?r on =1.5 (max. t a =25c) at v cc =3.0v ?r on =1.8 (max. t a =25c) at v cc =2.3v wide operating voltage range: ?v cc (opr) = 1.65 v to 4.3 v single supply 4.3 v tolerant and 1.8 v compatible threshold on digital control input at v cc = 2.3 to 4.3 v latch-up performance exceeds 300 ma (jesd 17) esd performance (analog channel vs. gnd): hbm > 2 kv (mil std 883 method 3015) description the stg3856 is a high-speed cmos low voltage dual analog sp3t (single pole triple throw) switch or dual 3 : 1 multiplexer /demultiplexer switch fabricated in silicon gate c 2 mos technology. it is designed to operate from 1.65 v to 4.3 v, making this device ideal for portable applications. the device offers very low on resistance (< 1.0 ) at v cc = 4.3 v. the disabling and enabling of switches are done by setting the 1in and 2in control pins. additional key features are fast switching speed, and ultra low power consumption. all inputs and outputs are equipped with protection circuits against static discharge, giving them esd immunity and transient excess voltage. qfn12l table 1. device summary order code temperature range package packaging STG3856QTR -40c to +85c qfn12l (2.2 x 1.4 mm) tape and reel www.st.com
summary description stg3856 2/15 doc id 11932 rev 3 1 summary description 1.1 pin connections and description figure 1. connection diagram (top through view) table 2. pin description 1.2 truth table table 3. truth table pin symbol name and function 12, 10 1in, 2in controls 1,2,3, 9,8,7 1s1, 1s2, 1s3, 2s 1, 2s2, 2s3 independent channels 4,6 d1, d2 common channels 11 v cc positive supply voltage 5 gnd ground (0 v) d1 gnd d2 456 7 8 9 3 2 1 1s1 1s2 1s3 12 11 10 2s1 2s2 2s3 in1 vcc in2 1in 2in switch state l l high impedance l h d1-1s1, d2-2s1 h l d1-1s2, d2-2s2 h h d1-1s3, d2-2s3
stg3856 summary description doc id 11932 rev 3 3/15 1.3 internal schematic figure 2. internal schematic 1.4 input equivalent circuit figure 3. input equivalent circuit
maximum ratings stg3856 4/15 doc id 11932 rev 3 2 maximum ratings stressing the device above the rating listed in the ?absolute maximum ratings? table may cause permanent damage to the device. these are stress ratings only and operation of the device at these or any other conditions above those indicated in the operating sections of this specification is not imp lied. exposure to absolute ma ximum rating conditions for extended periods may affect device reliability. table 4. absolute maximum ratings symbol parameter value unit v cc supply voltage -0.5 to 5.5 v v i dc input voltage -0.5 to v cc +0.5 v v ic dc control input voltage -0.5 to 5.5 v v o dc output voltage -0.5 to v cc +0.5 v i ikc dc input diode current on control pin (v in <0v) -50 ma i ik dc input diode current (v in < 0 v) 50 ma i ok dc output diode current 20 ma i o dc output current 150 ma i op dc output current peak (pulse at 1 ms, 10% duty cycle) 300 ma i cc or i gnd dc v cc or ground current 100 ma p d power dissipation at t a =70oc (1) 1. derate above 70oc by 18.5mw/c. mw t stg storage temperature -65 to 150 c t l lead temperature (10 sec) 300 c
stg3856 electrical characteristics doc id 11932 rev 3 5/15 3 electrical characteristics table 5. recommended operating conditions 3.1 dc electrical characteristics symbol parameter value unit v cc supply voltage (1) 1. truth table guaranteed: 1.2 v to 4.3 v. 1.4 to 4.3 v v i input voltage 0 to v cc v v ic control input voltage 0 to v cc v v o output voltage 0 to v cc v t op operating temperature -55 to 125 c dt/dv input rise and fall time control input v cc = 1.65 v to 2.7 v 0 to 20 ns/v v cc = 3.0 to 4.3 v 0 to 10 table 6. dc electrical characteristics symb ol parameter test condition value unit v cc (v) t a = 25c -40 to 85c -55 to 125c min typ max min max min max v ih high level input voltage 1.65 - 1.95 0.65 v cc ?? 0.65 v cc ? 0.65 v cc ? v 2.3 - 2.5 1.4 ? ? 1.4 ? 1.4 ? 2.7 - 3.0 1.4 ? ? 1.4 ? 1.4 ? 3.3 - 4.3 1.5 ? ? 1.5 ? 1.5 ? v il low level input voltage 1.65 - 1.95 ? ? 0.40 ? 0.40 ? 0.40 v 2.3 - 2.5 ? ? 0.50 ? 0.50 ? 0.50 2.7 - 3.0 ? ? 0.50 ? 0.50 ? 0.50 3.3 - 4.3 ? ? 0.50 ? 0.50 ? 0.50
electrical characteristics stg3856 6/15 doc id 11932 rev 3 r on switch on resistance 4.3 v s =0v to v cc i s = 100 ma ?0.61.0 ? 1.2 ? ? 3.0 ? 1.3 1.5 ? 1.8 ? ? 2.7 ? 1.5 1.8 ? 2.2 ? ? 2.3 ? 2.0 2.2 ? 2.6 ? ? 1.8 ? 2.5 3.0 ? 3.6 ? ? 1.65 ? 3.3 4.0 ? 4.8 ? ? r on on resistance match between channels 2.7 v s at r on max i s =100 ma ?0.01? ? ? ? ? r flat on resistance flatness (1)(2) 4.3 v s =0v to v cc i s =100 ma ??? ? ? ? ? 3.0 ? ? ? ? ? ? ? 2.7 ? 0.22 0.35 ? 0.35 ? ? 2.3 ? ? ? ? ? ? ? 1.65 ? ? ? ? ? ? ? i off off state leakage current (nsn), (dn) 4.3 v s =0.3 or 4 v ??20? 10 0 ??na i in input leakage current 0-4.3 v in =0 to 4.3 v ??0.1?1? a i cc quiescent supply current 1.65 - 4.3 v in =v c c or gnd ?? 0.0 5 ? 0. 2 ?1a i cclv quiescent supply current low voltage driving 4.3 v in1 , v in2 =1 .65 v ?3750 ? 10 0 ?? a v in1 , v in2 =1. 80v ?3340 ? 50 ? ? v in1 , v in2 =2 .60v ?1220 ? 30 ? ? 1. ron = max |msn-nsn|, where m = 1 and n = 2, n = 1..3 2. flatness is defined as the difference between the maximum and minimum value of on resistance as measured over the specif ied analog signal ranges. table 6. dc electrical characteristics (continued) symb ol parameter test condition value unit v cc (v) t a = 25c -40 to 85c -55 to 125c min typ max min max min max
stg3856 electrical characteristics doc id 11932 rev 3 7/15 3.2 ac electrical characteristics table 7. ac electrical characteristics (c l = 35 pf, r l = 50 , t r = t f 5ns) symbol parameter test condition value unit v cc (v) t a = 25c -40 to 85c -55 to 125c min typ max min max min max t plh , t phl propagation delay 1.65 - 1.95 ?0.45? ? ? ? ? ns 2.3 - 2.7 ? 0.40 ? ? ? ? ? 3.0 - 3.3 ? 0.30 ? ? ? ? ? 3.6 - 4.3 ? 0.30 ? ? ? ? ? t on turn-on time 1.65 - 1.95 v s =0.8v ? 56 ? ? ? ? ? ns 2.3 - 2.7 v s =1.5v ?3350 ?60? ? 3.0 - 3.3 ? 21 40 ? 50 ? ? 3.6 - 4.3 ? 19 40 ? 50 ? ? t off turn-off time 1.65 - 1.95 v s =0.8 ? 24 ? ? ? ? ns 2.3 - 2.7 v s =1.5v ?1725 ?40? ? 3.0 - 3.3 ? 14 20 ? 30 ? ? 3.6 - 4.3 ? 12 20 ? 30 ? ? t d break-before - make time delay 1.65 - 1.95 v s = 0.8 10 31 ? ? ? ? ? ns 2.3 - 2.7 v s =1.5v 10 22 40 ? 50 ? ? 3.0 - 3.3 10 18 30 ? 40 ? ? 3.6 - 4.3 10 7 25 ? 35 ? ? q charge injection 1.65 - 1.95 c l =100pf r l =1mo v gen =0v r gen =0 ?25? ? ? ? ? pc 2.3 - 2.7 ? 35 ? ? ? ? ? 3.0 - 3.3 ? 40 ? ? ? ? ? 3.6 - 4.3 ? 55 ? ? ? ? ?
electrical characteristics stg3856 8/15 doc id 11932 rev 3 3.3 analog switch table 8. analog switch characteristics (c l =5pf, r l =50 , t a =25c) symbol parameter test condition value unit v cc (v) t a = 25c -40 to 85c -55 to 125c min typ max min max min max o irr off isolation (1) 1. off isolation = 20 log 10 (v d /v s ), v d = output, v s = input at off switch 1.65 - 4.3 v s =1v rms f=100khz ?-82? ? ? ? ?db x talk crosstalk 1.6 - 4.3 v s = 1 v rms f=100khz ?-84? ? ? ? ?db t hd total harmonic distortion 2.3 - 4.3 r l =600 v in =2v pp f = 20 hz to 20 khz ?0.03? ? ? ? ? % bw -3db bandwidth 1.65 - 4.3 r l =50 ? 100 ? ? ? ? ? mhz c in control pin input capacitance ?5? ?? ? ? pf c sn(off) sn port off capacitance 3.3 f = 1 mhz ? ? ? ? ? ? ? c sn(on) sn port on capacitance 3.3 f = 1 mhz ? ? ? ? ? ? ? c d d port capacitance when switch is enabled 3.3 f = 1 mhz ? ? ? ? ? ? ?
stg3856 package mechanical data doc id 11932 rev 3 9/15 4 package mechanical data in order to meet environmental requirements, st offers these devices in different grades of ecopack ? packages, depending on their level of environmental compliance. ecopack ? specifications, grade definitions and product status are available at: www.st.com . ecopack ? is an st trademark. figure 4. qfn12l (2.2 x 1.4 mm) package outline all dimensions are in millimeters
package mechanical data stg3856 10/15 doc id 11932 rev 3 table 9. fn12l (2.2 x 1.4 mm) mechanical data figure 5. footprint recommendation symbol millimeters inches min typ max min typ max a 0.50 0.55 0.60 0.019 0.021 0.023 a1 0 0.02 0.05 0 0.001 0.002 b 0.15 0.20 0.25 0.006 0.007 0.010 d 1.30 1.40 1.50 0.051 0.055 0.059 e 2.10 2.20 2.30 0.082 0.086 0.090 e 0.40 0.015 l 0.35 0.40 0.45 0.013 0.015 0.017
stg3856 package mechanical data doc id 11932 rev 3 11/15 figure 6. qfn12l (2.2 x 1.4 mm) re el for carrier tape information
package mechanical data stg3856 12/15 doc id 11932 rev 3 figure 7. qfn12l (2.2 x 1.4 mm) re el for carrier tape information
stg3856 package mechanical data doc id 11932 rev 3 13/15 figure 8. qfn12l (2.2 x 1.4 mm) carrier tape information
revision history stg3856 14/15 doc id 11932 rev 3 5 revision history table 10. document revision history date revision changes 22-dec-2005 1 first draft. 23-dec-2005 2 few changes. 15-mar-2010 3 the document has been reformatted, added tape and reel information.
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