general description the max328/ma329 are monolithic cmos analog multi- plexers. the max328 is a single-ended, 1-of-8 device, and the max329 is a differential, 2-of-8 device. designed to provide the lowest possible on- and off- leakages, these multiplexers switch signals from high source impedance, providing the mux operates into a high-input-impedance op amp or a/d converter. the max328/max329 are pin-for-pin replacements for the popular dg508/dg509 in these applications. adding an external 40k ? resistor to each input makes the max328/max329 an excellent fault-tolerant multi- plexer. low leakage (less than 1pa at +25?) and 2.5k ? on-resistance allow the circuit to sustain 110v ac faults indefinitely while maintaining an error of less than 40nv for normal signals (i.e., 1pa times 40k ? ). the max328/max329 work equally well with a single supply of 10v to 30v or dual supplies of ?v to ?8v. they also perform well with unbalanced combinations of supply voltage, such as +12v and -5v or +5v and -15v. low power dissipation (1.9mw with ?5v supplies) allows use in portable applications. applications control systems data logging systems aircraft heads-up displays data-acquisition systems signal routing features ultra-low off- and on-leakage: 1pa typ bidirectional operation (use as mux or demux) ttl and cmos logic compatibility analog signal range includes power-supply rails switching speeds less than 1.5? pin compatible with dg508/dg509 and max358/max359 latchup proof construction max328/max329 ultra-low leakage monolithic cmos analog multiplexers ________________________________________________________________ maxim integrated products 1 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 a0 a1 a2 gnd v+ s5 s6 s7 s8 top view max328 dip/so en v- s3 s1 s2 s4 d 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 a0 a1 gnd v+ s1b s2b s3b s4b db max329 dip/so en v- s3a s1a s2a s4a da pin configurations ordering information max328 v+ v- gnd a 0 a 1 a 2 en s1 s8 d op amp +15v -15v 40k ? 1/2w 40k ? 1/2w analog input analog input dm7493 +15v +15v n.c. clk in n.c. gnd v 02 v 01 ain bin q b q c q o q a v+ en in (mux on/off control) out i bias < 1pa 1-of-8 channel sequential mux with 120v ac fault capability typical operating circuit 19-1006; rev 2; 9/01 for pricing, delivery, and ordering information, please contact maxim/dallas direct! at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. * contact factory for dice specifications. ** contact factory for availability. substrate may be allowed to float or be connected to v+. ordering information and pin configurations continued at end of data sheet. part temp range pin-package max328 cpe 0 c to +70 c 16 plastic dip max328cwe 0 c to +70 c 16 wide so max328cje 0 c to +70 c 16 cerdip max328c/d 0 c to +70 c dice* max328ege -40 c to +85 c 16 qfn max328epe -40 c to +85 c 16 plastic dip max328ewe -40 c to +85 c 16 wide so max328eje -40 c to +85 c 16 cerdip** max328mje -55 c to +125 c 16 cerdip**
max328/max329 ultra-low leakage monolithic cmos analog multiplexers 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics (v+ = +15v, v- = -15v, gnd = 0v, t a = +25 c, unless otherwise noted.) stresses beyond those listed under ?bsolute maximum ratings?may cause permanent damage to the device. these are stress rating s only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specificatio ns is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. voltage referenced to v- v+ ........................................................................................+44v gnd .....................................................................................+25v digital inputs (note 1), v s , v d ............................-2v to (v+ + 2v) current (any terminal, except s or d)................................30ma continuous current, s or d (pulsed at 1ms, 10% duty cycle max) ............................40ma operating temperature range max328/329 c _ _ ..............................................0 c to +70 c max328/329 e _ _ ...........................................-40 c to +85 c max328/329 m _ _.........................................-55 c to +125 c power dissipation (package) (note 1) 16-pin cerdip (note 2) ...............................................900mw 16-pin plastic dip (note 3)...........................................470mw 16-pin wide so (note 4) ..............................................750mw 16-pin qfn (note 5) ...................................................1538mw storage temperature.........................................-65 c to +150 c limits max328m max329m max328c/e max329c/e parameter symbol test conditions min typ max min typ max units switch analog signal range v analog 15 15 v v d = 10v, i s = 100a 1.5 2.5 1.5 3.5 drain-source on-resistance r ds ( on ) v d = -10v, i s = 100a seq. each switch on, v al = 0.8v, v ah = 2.4v 1.0 2.5 1.0 3.5 k ? greatest change in drain-source on- resistance between channels ? r ds ( on ) r ds(on) = r ds(on) max - r ds(on) min ( ) r ds(on) ave 22% v s = 10v, v d = -10v 0.1 10 0.1 10 source off-leakage current (note 6) i s(off) v s = -10v, v d = 10v v en = 0v 0.3 10 0.3 10 pa v d = 10v, v s = -10v 0.3 10 0.3 10 max328 v d = -10v, v s = 10v 1.0 10 1.0 10 v d = 10v, v s = -10v 0.3 10 0.3 10 drain off- leakage current (note 6) max329 i d(off) v d = -10v, v s = 10v v en = 0v 0.5 10 0.5 10 pa v s (all) = v d = 10v 3.0 10 3.0 10 max328 v s (all) = v d = -10v 2.0 10 2.0 10 v s (all) = v d = 10v 1.5 10 1.5 10 drain on- leakage current (note 6) max329 i d(on) v s (all) = v d = -10v seq. each switch on, v al = 0.8v, v ah = 2.4v 1.0 10 1.0 10 pa note 1: all leads soldered or welded to pc board. note 2: derate 12mw/ c above +75 c. note 3: derate 6.3mw/ c above +75 c. note 4: derate 10mw/ c above +75 c. note 5: derate 19.2mw/ c above +75 c.
max328/max329 ultra-low leakage monolithic cmos analog multiplexers _______________________________________________________________________________________ 3 electrical characteristics (continued) (v+ = +15v, v- = -15v, gnd = 0v, t a = +25 c, unless otherwise noted.) limits max328m max329m max328c/e max329c/e parameter symbol test conditions min typ max min typ max units input v a = 2.4v 0.001 1 0.001 1 address input current, input voltage high i ah v a = 15v 0.001 1 0.001 1 a v en = 2.4v 0.001 1 0.001 1 address input current, input voltage low i al v en = 0v all v a = 0v 0.001 1 0.001 1 a dynamic switching time of multiplexer t transition see figure 1 1.0 1.5 s break-before-make interval t open see figure 2 0.2 0.2 s enable turn-on time t on ( en ) see figure 3 1.0 1.5 s enable turn-off time t off ( en ) see figure 3 0.7 1.0 s off-isolation oirr v en = 0v, r l = 1k ? , c l = 15pf, v s = 7v rms , f = 500khz 84 84 db source off-capacitance c s ( off ) v s = 0v v en = 0v, f = 1mhz 1.8 1.8 pf max328 8.0 8.0 drain off- capacitance max329 c d ( off ) v d = 0v v en = 0v, f = 1mhz 4.0 4.0 pf v a = +10v 1 1 v a = 0v 2 5 2 5 charge injection (note 8) q (inj) v a = -10v 4 4 pc supply positive supply current i+ v en = 2.4v v a = 0v/5v 4.5 200 4.5 200 a negative supply current i- v en = 2.4v v a = 0v/5v 1 -100 1 -100 a power-supply range for continuous operation (note 7) v op 5 18 5 18 v note 6: all leakage parameters are 100% tested at maximum rated operating temperature, i.e., +70 c, +85 c, +125 c, and guaran- teed by correlation at +25 c. note 7: electrical characteristics, such as on-resistance, change when power supplies other than 15v are used. power-supply range is a design characteristic, not production tested. note 8: guaranteed by design. typical values are for design aid only, not guaranteed or subject to production testing.
max328/max329 ultra-low leakage monolithic cmos analog multiplexers 4 _______________________________________________________________________________________ electrical characteristics (over temperature) (v+ = +15v, v- = -15v, gnd = 0v, t a = t min to t max , unless otherwise noted.) limits max328m max329m max328c/e max329c/e parameter symbol test conditions min typ max min typ max units switch analog signal range v analog 15 15 v v d = 10v, i s = 100a 2.2 4 1.9 5 drain-source on-resistance r ds ( on ) v d = -10v, i s = 100a seq. each switch on, v al = 0.8v, v ah = 2.4v 1.5 4 1.2 5 k ? v s = 10v, v d = -10v 5 5 source off- leakage current (note 9) i s(off) v s = -10v, v d = 10v v en = 0v 5 5 na v d = 10v, v s = -10v 20 20 max328 v d = -10v, v s = 10v 20 20 v d = 10v, v s = -10v 10 10 drain off- leakage current (note 9) max329 i d(off) v d = -10v, v s = 10v v en = 0v 10 10 na v s (all) = v d = 10v 20 20 max328 v s (all) = v d = -10v 20 20 v s (all) = v d = 10v 10 10 drain on- leakage current (note 9) max329 i d(on) v s (all) = v d = -10v seq. each switch on, v al = 0.8v, v ah = 2.4v 10 10 na input v a = 2.4v 0.01 1 0.01 1 address input current, input voltage high i ah v a = 15v 0.01 1 0.01 1 a v en = 2.4v 0.01 1 0.01 1 address input current, input voltage low i al v en = 0v all v a = 0v 0.01 1 0.01 1 a note 9: leakage parameters are 100% tested at maximum rated operating temperature, i.e., +70 c, etc.
max328/max329 ultra-low leakage monolithic cmos analog multiplexers _______________________________________________________________________________________ 5 typical operating characteristics (t a = +25 c, unless otherwise noted.) r ds(on) vs. analog input for dual supplies max328/max329 toc01 analog input (v) r ds(on) (k ? ) 10 5 0 -5 -10 1 2 3 4 5 6 7 8 9 0 -15 15 5v supplies 15v supplies r ds(on) vs. analog input for single supply max328/max329 toc02 analog input (v) r ds(on) (k ? ) 10 5 1 2 3 4 5 0 015 with +15v supply i s(off) vs. temperature max328/max329 toc03 temperature ( c) leakage (na) 105 85 65 45 25 5 -15 -35 0.001 0.01 0.1 1.0 10.0 0.0001 -55 125 v+ = 15v v- = 15v max328/ max329 i d(on), i d(off) vs. temperature max328/max329 toc04 temperature ( c) leakage (na) 105 85 65 45 25 5 -15 -35 0.01 0.1 1.0 10 100 0.001 -55 125 v+ = 15v v- = 15v max328
max328/max329 ultra-low leakage monolithic cmos analog multiplexers 6 _______________________________________________________________________________________ pin max328 max329 dip/so qfn dip/so qfn name function 1, 15, 16 15, 14, 13 a0, a2, a1 address input 1, 16 15, 14 a0, a1 address input 2 16 2 16 en enable 3 1 3 1 v- negative-supply voltage input 4 72 5 s1 s4 analog inputs bidirectional 4 72 5 s1a s4a analog inputs bidirectional 86 d analog outputs bidirectional 8, 9 6, 7 da, db analog outputs bidirectional 9 12 7 10 s8 s5 analog inputs bidirectional 10 13 8 11 s4b s1b analog inputs bidirectional 13 11 14 12 v+ positive-supply voltage input 14 12 15 13 gnd ground pin description truth table?ax328 a 2 a 1 a 0 en on switch x x x 0 none 00001 00112 01013 01114 10015 10116 11017 11118 truth table max329 a 1 a 0 en on switch x x 0 none 0011 0112 1013 1114 note: logic 0 = v al 0.8v, logic 1 = v ah 2.4v
max328/max329 ultra-low leakage monolithic cmos analog multiplexers _______________________________________________________________________________________ 7 max328 a 2 +5v s 1 a 1 en 2.4v v out v a out s 8 a 0 s 2 ? 7 gnd 1k ? 50 ? 12.5pf 0v v ah = 3.0v t open 50% 50% output address drive (v a ) figure 2. break-before-make delay (t open ) max328 a 2 s 1 a 1 en v a out a 0 s 2 s 7 gnd 1k ? 50 ? 12.5pf +10v 50% 90% 90% t off(en) t on(en) output enable drive v ah = 3.0v 0v figure 3. enable delay (t on(en) , t off(en) ) max328 a 2 10v -10v 0v +10v 50% 90% 10v s 1 a 1 s 2 en +v ah v ah = 3.0v output a v a t a out s 8 a 0 s 2 s 7 gnd 10m ? 50 ? probe 14pf address drive (v a ) figure 1. access time vs. logic level (high)
max328/max329 ultra-low leakage monolithic cmos analog multiplexers 8 _______________________________________________________________________________________ applications information figure 4 is a typical circuit for converting the max328/max329 into a fault-tolerant mux. in this application, the internal diodes limit the voltage at the max328 input to 15.7v (15v supplies). no external diodes need to be added with the max328/max329, unlike conventional multiplexers requiring external diodes. the resistors, r, need to be 39k ? or higher to limit the power dissipation in the resistor when a 120v ac fault occurs (i.e., power dissipation is (120-16) 2 /39k ? or 0.28w. this is why a 1/2/w resistor is needed). the circuit withstands an indefinite fault to a 120v ac line with no damage to any component. in addition to allowing fault-protection, the guaranteed low leakage of the max328/max329 also reduces signal errors. the circuit in figure 4 produces an error voltage of 10pa (max leakage) x 39k ? or 0.39v at room tempera- ture and 39v at +125 c. therefore, for 10v signals, the max328/max329 allows 17-bit resolution (38v = 1lsb) over the full temperature range. s8 d 98 10 11 12 13 14 s7 s6 s5 v+ gnd 7 6 5 4 3 s4 s3 s2 s1 v- 15 16 1 2 a2 a1 a0 en 0.104 (2.64mm) 0.118 (2.90mm) 0.104 (2.64mm) 0.118 (2.90mm) en a0 a1 2 1 16 7 6 5 4 3 s4a s3a s2a s1a v- db da 98 10 11 12 13 14 15 s4b s3b s2b s1b v+ gnd max328 max329 chip topographies 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 a 0 a 1 a 2 max328 max329 en v out s 4 s 3 s 2 s 1 1 f -15v r r r r r r r r s 5 s 6 s 7 s 8 1 f +15v r = 39k ? 1/2w figure 4. fault-tolerant mux (indefinitely withstands 120v ac fault voltages)
max328/max329 ultra-low leakage monolithic cmos analog multiplexers maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circuit patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 _____________________ 9 ? 2001 maxim integrated products printed usa is a registered trademark of maxim integrated products. ordering information (continued) * contact factory for dice specifications. ** contact factory for availability. substrate may be allowed to float or be connected to v+. part temp range pin-package max329 cpe 0 c to +70 c 16 plastic dip max329cwe 0 c to +70 c 16 wide so max329cje 0 c to +70 c 16 cerdip max329c/d 0 c to +70 c dice* max329ege -40 c to +85 c 16 qfn max329epe -40 c to +85 c 16 plastic dip max329ewe -40 c to +85 c 16 wide so max329eje -40 c to +85 c 16 cerdip** max329mje -55 c to +125 c 16 cerdip** 16 en 15 a0 14 a1 13 a2 10 s5 11 v+ 12 gnd 9s6 2s1 1v- 3s2 4s3 5s4 6 d 7 s8 8s7 max328 logic 16 en 15 a0 14 a1 13 gnd 10 s2b 11 s1b 12 v+ 9 s3b 2s1a 1v- 3s2a 4s3a 5s4a 6 da 7 db 8s4b max329 logic top view pin configurations (continued) package information for the latest package outline information, go to www.maxim-ic.com/packages .
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