? 2005 fairchild semiconductor corporation ds500883 www.fairchildsemi.com march 2004 revised april 2005 fsa1256 ? fsa1256a fsa1257 fsa1257a fsa1258 fsa1258a low ron low voltage dual spst analog switch with low icct ?a? option fsa1256 fsa1256a fsa1257 fsa1257a fsa1258 fsa1258a low r on low voltage dual spst analog switch with low i cct ? a ? option general description the fsa1256, fsa1256a, fsa1257, fsa1257a, fsa1258, and fsa1258a are high performance dual sin- gle pole/single throw (spst) analog switches. all devices feature ultra low r on of 1.1 : maximum at 4.5v v cc . the fsa1256, fsa1257, and fsa1258 operate over a wide v cc range of 1.65v to 5.5v. the fsa1256a, fsa1257a, and fsa1258a operation range is 2.7v to 5.5v. these devices are fabricated with sub-micron cmos technology to achieve fast switching speeds and are designed for break-before-make operation. the select input is ttl level compatible. the fsa1256 and fsa1256a feature two nor- mally open (no) switches. the fsa1257 and fsa1257a feature two normally closed (nc) switches. the fsa1258 and fsa1258a have one no switch and one nc switch. features fsa1256a, fsa1257a, fsa1258a feature low i cct when s input is lower than v cc maximum 1.1 : on resistance (r on ) for 4.5v supply 0.4 : max r on flatness for 4.5v supply space saving pb-free micropak packaging broad v cc operating range: ? fsa1256, fsa1257, fsa1258: 1.65v to 5.5v fsa1256a, fsa1257a, fsa1258a: 2.7v to 5.5v fast turn-on and turn-off time fsa1258, fsa1258a feature break-before-make enable circuitry over-voltage tolerant ttl compatible control input ordering code: pb-free package per jedec j-std-020b. micropak is a trademark of fairchild semiconductor corporation. product package description supplied as order package code number number top mark fsa1256l8x mac08a eb pb-free 8-lead micropak, 1.6 mm wide 5k units on tape and reel FSA1256AL8X mac08a fn pb-free 8-lead micropak, 1.6 mm wide 5k units on tape and reel fsa1257l8x mac08a ec pb-free 8-lead micropak, 1.6 mm wide 5k units on tape and reel fsa1257al8x mac08a fp pb-free 8-lead micropak, 1.6 mm wide 5k units on tape and reel fsa1258l8x mac08a ed pb-free 8-lead micropak, 1.6 mm wide 5k units on tape and reel fsa1258al8x mac08a fs pb-free 8-lead micropak, 1.6 mm wide 5k units on tape and reel
www.fairchildsemi.com 2 fsa1256 fsa1256a fsa1257 fsa1257a fsa1258 fsa1258a analog symbols fsa1256, fsa1256a (top through view) fsa1257, fsa1257a (top through view) truth tables h high logic level l low logic level analog symbol fsa1258, fsa1258a (top through view) truth table h high logic level l low logic level pin descriptions fsa1256, fsa1256a control input(s) function l disconnect h a connected to b fsa1257, fsa1257a control input(s) function l a connected to b h disconnect fsa1258, fsa1258a control input 1s function control input 2s function l 1a connected to 1b l disconnect h disconnect h 2a connected to 2b pin names function a, b data ports s control input
3 www.fairchildsemi.com fsa1256 fsa1256a fsa1257 fsa1257a fsa1258 fsa1258a absolute maximum ratings (note 1) recommended operating conditions note 1: the ? absolute maximum ratings ? are those values beyond which the safety of the device cannot be guaranteed. the device should not be operated at these limits. the parametric values defined in the electrical characteristics tables are not guaranteed at the absolute maximum ratings. the ? recommended operating conditions ? table will define the conditions for actual device operation. note 2: the input and output negative voltage ratings may be exceeded if the input and output diode current ratings are observed. note 3: unused inputs must be held high or low. they may not float. dc electrical characteristics (all typical values are @ 25 q c unless otherwise specified) note 4: on resistance is determined by the voltage drop between a and b pins at the indicated current through the switch. note 5: ' r on r onmax r onmin measured at identical v cc , temperature, and voltage. note 6: flatness is defined as the difference between the maximum and minimum value of on resistance over the specified range of condit ions. supply voltage (v cc ) 0.5v to 6.0v switch voltage (v s ) (note 2) 0.5v to v cc 0.5v input voltage (v in ) (note 2) 0.5v to 6.0v input diode current 50 ma switch current 200 ma peak switch current (pulsed at 1 ms duration, 10% duty cycle) 400 ma power dissipation @ 85 q c micropak 8l package 180 mw storage temperature range (t stg ) 65 q c to 150 q c maximum junction temperature (t j ) 150 q c lead temperature (t l ) soldering, 10 seconds 260 q c esd human body model fsa1256, fsa1257, fsa1258 5.5kv fsa1256a, fsa1257a, fsa1258a 4.5kv supply voltage (v cc ) fsa1256, fsa1257, fsa1258 1.65v to 5.5v fsa1256a, fsa1257a, fsa1258a 2.7v to 5.5v control input voltage (v in ) (note 3) 0v to v cc switch input voltage (v in )0v to v cc operating temperature (t a ) 40 q c to 85 q c thermal resistance ( t ja ) in still air micropak 8l package 224 q c/w (modeled) symbol parameter v cc t a 25 q ct a 40 q c to 85 q c units conditions (v) min typ max min max v ih input voltage high 2.7 to 3.6 2.0 v 4.5 to 5.5 2.4 v il input voltage low 2.7 to 3.6 0.4 v fsa1256a, fsa1257a, fsa1258a only 2.7 to 3.6 0.6 4.5 to 5.5 0.8 i in control input leakage 2.7 to 3.6 1.0 1.0 p av in 0v to v cc 4.5 to 5.5 1.0 1.0 i no(off) , off-leakage current 5.5 -2.0 2.0 20.0 20.0 na a 1v, 4.5v i nc(off) 1b or 2b 1v, 4.5v r on switch on resistance 2.7 2.6 4.0 4.3 : i out 100 ma, 1b or 2b 1.5v (note 4) 4.5 0.95 1.15 1.3 i out 100 ma, 1b or 2b 3.5v ' r on on resistance matching : between channels 4.5 0.06 0.12 0.15 i out 100 ma, 1b or 2b 3.5v (note 5) r flat(on) on resistance flatness 2.7 1.4 : i out 100 ma, 1b or 2b 0v, 0.75v, 1.5v (note 6) 4.5 0.2 0.3 0.4 i out 100 ma, 1b or 2b 0v, 1v, 2v i cc quiescent supply current 3.6 0.1 0.5 1.0 p av in 0v or v cc , i out 0v 5.5 0.1 0.5 1.0 i cct increase in i cc per input 4.3 0.2 10.0 p a one input at 2.6v, others at v cc or gnd (fsa1256a, fsa1257a, fsa1258a only)
www.fairchildsemi.com 4 fsa1256 fsa1256a fsa1257 fsa1257a fsa1258 fsa1258a ac electrical characteristics (all typical value are @ 25 q c unless otherwise specified) capacitance symbol parameter v cc t a 25 q ct a 40 q c to 85 q c units conditions figure (v) min typ max min max number t on turn on time 2.7 to 3.6 15.0 50.0 60.0 ns 1b or 2b 1.5v, r l 50 : , c l 35 pf figure 1 4.5 to 5.5 10.0 35.0 40.0 1b or 2b 3.0v, r l 50 : , c l 35 pf t off turn off time 2.7 to 3.6 8.0 20.0 30.0 ns 1b or 2b 1.5v, r l 50 : , c l 35 pf figure 1 4.5 to 5.5 4.0 15.0 20.0 1b or 2b 3.0v, r l 50 : , c l 35 pf t b-m break-before-make 2.7 to 3.6 12.0 ns 1b or 2b 1.5v, r l 50 : , c l 35 pf figure 2 time 4.5 to 5.5 7.0 1b or 2b 3.0v, r l 50 : , c l 35 pf q charge injection 2.7 to 3.6 10.0 pc c l 1.0 nf, v gen 0v, figure 4 4.5 to 5.5 20.0 r gen 0 : oirr off-isolation 2.7 to 3.6 70.0 db f 1mhz, r l 50 : figure 3 4.5 to 5.5 70.0 xtalk crosstalk 2.7 to 3.6 100 db f 1mhz, r l 50 : figure 6 4.5 to 5.5 100 bw 3db bandwidth 2.7 to 3.6 300 mhz r l 50 : figure 7 4.5 to 5.5 300 thd total harmonic 2.7 to 3.6 0.002 % r l 600 : , v in 0.5v p.p, figure 8 distortion 4.5 to 5.5 0.002 f 20hz to 20khz symbol parameter v cc t a 25 q ct a 40 q c to 85 q c units conditions (v) min typ max min max c in control pin input capacitance 0.0 3.0 pf f 1mhz (see figure 6) c off b port off capacitance 4.5 11.5 pf f 1mhz (see figure 6) c on a port on capacitance 4.5 27.0 pf f 1mhz (see figure 6)
5 www.fairchildsemi.com fsa1256 fsa1256a fsa1257 fsa1257a fsa1258 fsa1258a ac loading and waveforms c l includes fixture and stray capacitance logic input waveforms inverted for switches that have the opposite logic sense figure 1. turn-on/turn-off timing figure 2. break-before-make timing figure 3. off isolation
www.fairchildsemi.com 6 fsa1256 fsa1256a fsa1257 fsa1257a fsa1258 fsa1258a ac loading and waveforms (continued) q ( ' v out )(c l ) figure 4. charge injection figure 5. crosstalk figure 6. on/off capacitance measurement setup
7 www.fairchildsemi.com fsa1256 fsa1256a fsa1257 fsa1257a fsa1258 fsa1258a ac loading and waveforms (continued) figure 7. bandwidth figure 8. harmonic distortion
www.fairchildsemi.com 8 fsa1256 fsa1256a fsa1257 fsa1257a fsa1258 fsa1258a tape and reel specification tape format for micropak reel dimensions inches (millimeters) package tape number cavity cover tape designator section cavities status status leader (start end) 125 (typ) empty sealed l8x carrier 5000 filled sealed trailer (hub end) 75 (typ) empty sealed tape size abcdn w1 w2 w3 8 mm 7.0 0.059 0.512 0.795 2.165 0.331 0.059/ 0.000 0.567 w1 0.078/ 0.039 (177.8) (1.50) (13.00) (20.20) (55.00) (8.40 1.50/ 0.00) (14.40) (w1 2.00/ 1.00)
9 www.fairchildsemi.com fsa1256 fsa1256a fsa1257 fsa1257a fsa1258 fsa1258a low ron low voltage dual spst analog switch with low icct ? a ? option physical dimensions inches (millimeters) unless otherwise noted pb-free 8-lead micropak, 1.6 mm wide package number mac08a fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and fairchild reserves the right at any time without notice to change said circuitry and specifications. life support policy fairchild ? s products are not authorized for use as critical components in life support devices or systems without the express written approval of the president of fairchild semiconductor corporation. as used herein: 1. life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be rea- sonably expected to result in a significant injury to the user. 2. a critical component in any component of a life support device or system whose failure to perform can be rea- sonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. www.fairchildsemi.com
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