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_______________general description the MAX378 8-channel single-ended (1-of-8) multiplexer and the max379 4-channel differential (2-of-8) multiplexer use a series n-channel/p-channel/n-channel structure to provide significant fault protection. if the power supplies to the MAX378/max379 are inadvertently turned off while input voltages are still applied, all channels in the muxes are turned off, and only a few nanoamperes of leakage cur- rent will flow into the inputs. this protects not only the MAX378/max379 and the circuitry they drive, but also the sensors or signal sources that drive the muxes. the series n-channel/p-channel/n-channel protection structure has two significant advantages over the simple current-limiting protection scheme of the industry? first- generation fault-protected muxes. first, the maxim protec- tion scheme limits fault currents to nanoamp leakage values rather than many milliamperes. this prevents dam- age to sensors or other sensitive signal sources. second, the MAX378/max379 fault-protected muxes can withstand a continuous ?0v input, unlike the first generation, which had a continuous ?5v input limitation imposed by power dissipation considerations. all digital inputs have logic thresholds of 0.8v and 2.4v, ensuring both ttl and cmos compatibility without requir- ing pull-up resistors. break-before-make operation is guaranteed. power dissipation is less than 2mw. ________________________applications data acquisition systems industrial and process control systems avionics test equipment signal routing between systems ____________________________features ? fault input voltage ?5v with power supplies off ? fault input voltage ?0v with ?5v power supplies ? all switches off with power supplies off ? on channel turns off if overvoltage occurs on input or output ? only nanoamperes of input current under all fault conditions ? no increase in supply currents due to fault conditions ? latchup-proof construction ? operates from ?.5v to ?8v supplies ? all digital inputs are ttl and cmos compatible ? low-power monolithic cmos design ______________ordering information ordering information continued at end of data sheet. * contact factory for availability. **the substrate may be allowed to float or be tied to v+ (ji cmos). MAX378/max379 high-voltage, fault-protected analog multiplexers ________________________________________________________________ maxim integrated products 1 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 a1 a2 gnd v+ in1 v- en a0 top view MAX378 in5 in6 in7 in8 out in4 in3 in2 dip 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 a1 gnd v+ in1b in1a v- en a0 max379 in2b in3b in4b outb outa in4a in3a in2a dip __________________________________________________________pin configurations call toll free 1-800-998-8800 for free samples or literature. 19-1902; rev 1; 8/94 part MAX378 cpe MAX378cwg MAX378cje 0? to +70? 0? to +70? 0? to +70? temp. range pin-package 16 plastic dip 24 wide so 16 cerdip MAX378epe MAX378ewg -40? to +85? -40? to +85? 16 plastic dip 24 wide so MAX378eje MAX378mje -55? to +125? -40? to +85? 16 cerdip 16 cerdip MAX378mlp -55? to +125? 20 lcc* pin configurations continued at end of data sheet. MAX378c/d 0? to +70? dice**
MAX378/max379 high-voltage, fault-protected analog multiplexers 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics (v+ = +15v, v- = -15v; v ah (logic level high) = +2.4v, v al (logic level low) = +0.8v, unless otherwise noted.) stresses beyond those listed under ?bsolute maximum ratings?may cause permanent damage to the device. these are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. voltage between supply pins ..............................................+44v v+ to ground ...................................................................+22v v- to ground......................................................................-22v digital input overvoltage: v+......................................................................+4v v- ........................................................................-4v analog input with multiplexer power on..............................?5v recommended v+ .....................................+15v power supplies v- .......................................-15v analog input with multiplexer power off..............................?0v continuous current, in or out...........................................20ma peak current, in or out (pulsed at 1ms, 10% duty cycle max) ............................40ma power dissipation (note 1) (cerdip) ................................1.28w operating temperature range: MAX378/379c .....................................................0? to +70? MAX378/379e ..................................................-40? to +85? MAX378/379m ...............................................-55? to +125? storage temperature range .............................-65? to +150? (note 4) v in = ?0v, v out = ?0v (notes 3, 4) (note 2) max379 only (note 6) v a = 5v or 0v (note 5) v out = 0v, v in = ?0v (notes 3, 4) (note 4) ? -1.0 1.0 i a input leakage current (high or low) v 2.4 v ah input high threshold -100 100 k 3.0 4.0 v 0.8 v al input low threshold ? 25 i in(off) input leakage current (with overvoltage) ? 10 v -15 +15 v an analog signal range na -50 50 i diff differential off output leakage current na 20 i out(off) output leakage current (with input overvoltage) v en , v a { {} note 1: derate 12.8mw/? above t a = +75? v out = ?0v, i in = 100? v al = 0.8v, v ah = 2.4v 2.0 3.0 r ds(on) on resistance full +25? full full full +25? full +25? -1.0 1.0 2.4 -100 100 3.0 4.0 0.8 40 20 -15 +15 -50 50 20 2.0 3.5 na -50 50 v in = ?0v, v out = 10v v en = 0.8v (note 6) -0.5 0.03 0.5 i in(off) off input leakage current +25? -50 50 -1.0 0.03 1.0 na -200 200 v out = ?0v, v in = 10v v en = 0.8v MAX378 (note 6) max379 -1.0 0.1 1.0 i out(off) off output leakage current +25? -200 200 -2.0 0.1 2.0 na -600 600 v in(all) = v out = ?0v v ah = v en = 2.4v MAX378 v al = 0.8v (note 5) max379 -10 0.1 10 i out(on) on channel leakage current +25? -600 600 -20 0.1 20 -300 300 -300 300 v in = ?5v, v en = v out = 0v a 0 = a 1 = a 2 = 0v or 5v ? 10 i in(off) input leakage current (with power supplies off) +25? 20 min typ max min typ max conditions units -55? to +125? symbol parameter temp 0? to +70? and -40? to +85? static fault control full full full full full full full
MAX378/max379 high-voltage, fault-protected analog multiplexers _______________________________________________________________________________________ 3 note 2: when the analog signal exceeds +13.5v or -12v, the blocking action of maxim? gate structure goes into operation. only leakage currents flow and the channel on resistance rises to infinity. note 3: the value shown is the steady-state value. the transient leakage is typically 50?. see detailed description . note 4: guaranteed by other static parameters. note 5: digital input leakage is primarily due to the clamp diodes. typical leakage is less than 1na at +25?. note 6: leakage currents not tested at t a = cold temp. note 7: electrical characteristics, such as on resistance, will change when power supplies other than ?5v are used. electrical characteristics (continued) (v+ = +15v, v- = -15v; v ah (logic level high) = +2.4v, v al (logic level low) = +0.8v, unless otherwise noted.) pf 0.1 c ds(off) input to output capacitance v en = 0.8v or 2.4v all v a = 0v or 5v +25? v en = 0.8v, r l = 1k , c l = 15pf v = 7v rms , f = 100khz (note 7) MAX378 max379 conditions 0.1 v ?.5 ?8 v op power-supply range for continuous operation 0.3 0.7 ns 1000 ma 0.1 0.6 i+ positive supply current pf 5 c a digital input capacitance 12 db 50 68 off (iso) ?ff isolation pf 5 c in(off) channel input capacitance pf 25 c out(off) channel output capacitance units -55? to +125? symbol parameter figure 3 400 750 t on(en) enable delay (on) +25? +25? +25? +25? +25? +25? temp +25? ?.5 ?8 0.5 1.0 1500 0.2 1.0 5 12 50 68 5 25 0? to +70? and -40? to +85? 400 1000 ? 3.5 1.2 t sett settling time (0.1%) (0.01%) +25? 3.5 1.2 figure 1 ? 0.5 1.0 t a access time +25? 0.5 1.0 v en = +5v, v in = ?0v a 0 , a 1 , a 2 strobed ns 25 200 t on -t off break-before-make delay (figure 2) +25? 25 200 ns 1000 figure 3 300 500 t off(en) enable delay (off) +25? 1000 300 v en = 0.8v or 2.4v all v a = 0v or 5v 0.02 0.2 ma 0.01 0.1 i- negative supply current +25? 0.02 0.1 0.01 0.1 min typ max min typ max supply dynamic full full full full
MAX378/max379 high-voltage, fault-protected analog multiplexers 4 _______________________________________________________________________________________ 1m 10p -100 -50 50 100 input leakage vs. input voltage with v+ = v- = 0v 1n 10 m MAX378-1 v in (v) input current (a) 0 100n 100p 10n 100 m 1 m -80v +80v operating range 100 m 1p -120 -60 60 120 off channel leakage current vs. input voltage with ?5v supplies 100p 1 m MAX378-2 v in (v) i in(off) (a) 0 10n 10p 1n 10 m 100n operating range -60v +60v 10n 1p -120 -60 60 120 output leakage current vs. off channel overvoltage with ?5v supplies 100p MAX378-3 v in(off) (v) i out(off) (a) 0 10p 1n operating range -60v +60v 0 -10 -5 5 15 -15 0 20 drain-source on-resistance vs. analog input voltage MAX3784 analog input (v) r ds(on) (k w ) 10 1 3 2 4 5 6 7 ?v supplies ?5v supplies +13v +13v +3.5v +4v __________________________________________typical operating characteristics note: typical r ds(on) match @ +10v analog in (?5v supplies) = 2% for lowest to highest r ds(on) channel; @ -10v analog in, match = 3%. MAX378 gnd 14pf probe out +v ah in8 in2-in7 in1 in2 a2 a1 v a MAX378: v ah = 3.0v 0v -10v output a 90% +10v 50% t a a0 10v en 10m 50 w ?0v address drive (v a ) figure 1. access time vs. logic level (high)
MAX378/max379 high-voltage, fault-protected analog multiplexers _______________________________________________________________________________________ 5 MAX378* gnd v out out 2.4v in8 in2-in7 in1 in2 a2 a1 v a max358: v ah = 3.0v address drive (v a ) output 50% 50% 0v t open a0 en *similar connection for max379 12.5pf 1k 50 w +5v figure 2. break-before-make delay (t open ) MAX378* gnd out in2-in7 in1 a2 a1 v a a0 en *similar connection for max379 12.5pf 1k 50 w +10v MAX378: v ah = 3.0v 0v enable drive output 90% 50% t on(en) t off(en) 90% figure 3. enable delay (t on(en) , t off(en) ) MAX378 v- ?0v v- gnd out a0 a1 a2 en in1 in8 10k +15v +5v -15v i v ?0v analog signal figure 4. input leakage current (overvoltage) MAX378 v- ?5v v- gnd out a0 a1 a2 en in1 10k 0v +5v or 0v 0v i figure 5. input leakage current (with power supplies off)
MAX378/max379 high-voltage, fault-protected analog multiplexers 6 _______________________________________________________________________________________ _______________typical applications figure 6 shows a typical data acquisition system using the MAX378 multiplexer. since the multiplexer is driving a high-impedance input, its error is a func- tion of its own resistance (r ds(on) ) times the multi- plexer leakage current (i out(on) ) and the amplifier bias current (i bias ): v err = r ds(on) x (i out(on) + i bias (max420)) = 2.0k x (2na + 30pa) = 18.0? maximum error in most cases, this error is low enough that preamplifi- cation of input signals is not needed, even with very low-level signals such as 40?/? from type j thermo- couples. in systems with fewer than eight inputs, an unused chan- nel can be connected to the system ground reference point for software zero correction. a second channel connected to the system voltage reference allows gain correction of the entire data acquisition system as well. a max420 precision op amp is connected as a pro- grammable-gain amplifier, with gains ranging from 1 to 10,000. the guaranteed 5v unadjusted offset of the max420 maintains high signal accuracy, while program- mable gain allows the output signal level to be scaled to the optimum range for the remainder of the data acqui- sition system, normally a sample/hold and a/d. since the gain-changing multiplexer is not connected to the external sensors, it can be either a dg508a multiplexer or the fault-protected max358 or MAX378. truth table?ax378 a2 a1 a0 en on switch x 0 0 0 0 1 1 1 1 x 0 0 1 1 0 0 1 1 x 0 1 0 1 0 1 0 1 0 1 1 1 1 1 1 1 1 none 1 2 3 4 5 6 7 8 truth table?ax379 a1 a0 en on switch x 0 0 1 1 x 0 1 0 1 0 1 1 1 1 none 1 2 3 4 note: logic ??= v al 0.8v, logic ??= v ah 3 2.4v max420 +15v -15v v+ +15v 1m 100k 10k out out 1k 111 w in1 in1 in2 in3 in4 in5 v+ thermocouple +15v -15v v- gnd dg508a max358 or MAX378 MAX378 in2 strain guage in7 +10v gain reference in8 zero reference in3 4-20ma loop transmitter in4 in5 in6 -15v v- gnd figure 6. typical data acquisition front end
MAX378/max379 high-voltage, fault-protected analog multiplexers _______________________________________________________________________________________ 7 input switching, however, must be done with a fault- protected MAX378 multiplexer, to provide the level of protection and isolation required with most data acqui- sition inputs. since external signal sources may contin- ue to supply voltage when the multiplexer and system power are turned off, non-fault-protected multiplexers, or even first-generation fault-protected devices, will allow many milliamps of fault current to flow from out- side sources into the multiplexer. this could result in damage to either the sensors or the multiplexer. a non- fault-protected multiplexer will also allow input overvolt- ages to appear at its output, perhaps damaging sample/holds or a/ds. such input overdrives may also cause input-to-input shorts, allowing the high current output of one sensor to possibly damage another. the MAX378 eliminates all of the above problems. it not only limits its output voltage to safe levels, with or without power applied (v+ and v-), but also turns all channels off when power is removed. this allows it to draw only sub-microamp fault currents from the inputs, and maintain isolation between inputs for continuous input levels up to ?5v with power supplies off. _______________detailed description fault protection circuitry the MAX378/max379 are fully fault protected for contin- uous input voltages up to ?0v, whether or not the v+ and v- power supplies are present. these devices use a ?eries fet?switching scheme which not only pro- tects the multiplexer output from overvoltage, but also limits the input current to sub-microamp levels. figures 7 and 8 show how the series fet circuit pro- tects against overvoltage conditions. when power is off, the gates of all three fets are at ground. with a -60v input, n-channel fet q1 is turned on by the +60v gate- g d q 1 s -60v -60v overvoltage n-channel mosfet is turned on because v gs = +60v p-channel mosfet is off g d q 2 s g d q 3 s figure 7. -60v overvoltage with multiplexer power off q 1 v tn = +1.5v -15v +15v -15v +13.5v +60v overvoltage n-channel mosfet is turned on because v gs = -45v q 2 q 3 n-channel mosfet is on +13.5v output +15v from drivers -15v from drivers figure 10. +60v overvoltage input to the on channel q 1 -15v +15v -15v -60v -60v overvoltage n-channel mosfet is turned off because v gs = +45v q 2 q 3 p-channel mosfet is off n-channel mosfet is off +60v forced on common output line by external circuitry -15v from drivers +15v from drivers figure 9. -60v overvoltage on an off channel with multiplexer power supply on g d q 1 s +60v overvoltage n-channel mosfet is turned off because v gs = -60v g d q 2 s g d q 3 s figure 8. +60v overvoltage with multiplexer power off
MAX378/max379 high-voltage, fault-protected analog multiplexers 8 _______________________________________________________________________________________ to-source voltage. the p-channel device (q2), howev- er, has +60v v gs and is turned off, thereby preventing the input signal from reaching the output. if the input voltage is +60v, q1 has a negative v gs , which turns it off. similarly, only sub-microamp leakage currents can flow from the output back to the input, since any volt- age will turn off either q1 or q2. figure 9 shows the condition of an off channel with v+ and v- present. as with figures 7 and 8, either an n-channel or a p-channel device will be off for any input voltage from -60v to +60v. the leakage current with negative overvoltages will immediately drop to a few nanoamps at +25?. for positive overvoltages, that fault current will initially be 40? or 50?, decaying over a few seconds to the nanoamp level. the time constant of this decay is caused by the discharge of stored charge from internal nodes, and does not com- promise the fault-protection scheme. figure 10 shows the condition of the on channel with v+ and v- present. with input voltages less than ?0v, all three fets are on and the input signal appears at the output. if the input voltage exceeds v+ minus the n- channel threshold voltage (v tn ), then the n-channel fet will turn off. for voltages more negative than v- minus the p-channel threshold (v tp ), the p-channel device will turn off. since v tn is typically 1.5v and v tp is typically 3v, the multiplexer? output swing is limited to about -12v to +13.5v with ?5v supplies. the typical operating characteristics graphs show typi- cal leakage vs. input voltage curves. although the max- imum rated input of these devices is ?5v, the MAX378/max379 typically have excellent performance up to ?5v, providing additional margin for the unknown transients that exist in the real world. in summary, the MAX378/max379 provide superior protection from all fault conditions while using a standard, readily pro- duced junction-isolated cmos process. switching characteristics and charge injection table 1 shows typical charge-injection levels vs. power-supply voltages and analog input voltage. note that since the channels are well matched, the differen- tial charge injection for the max379 is typically less than 5pc. the charge injection that occurs during switching creates a voltage transient whose magnitude is inversely proportional to the capacitance on the mul- tiplexer output. the channel-to-channel switching time is typically 600ns, with about 200ns of break-before-make delay. this 200ns break-before-make delay prevents the input-to-input short that would occur if two input channels were simultaneous- ly connected to the output. in a typical data acquisition system, such as in figure 6, the dominant delay is not the switching time of the MAX378 multiplexer, but is the set- tling time of the following amplifiers and s/h. another limit- ing factor is the rc time constant of the multiplexer r ds(on) plus the signal source impedance multiplied by the load capacitance on the output of the multiplexer. even with low signal source impedances, 100pf of capac- itance on the multiplexer output will approximately double the settling time to 0.01% accuracy. operation with supply voltage other than ?5v the main effect of supply voltages other than ?5v is the reduction in output signal range. the MAX378 limits the output voltage to about 1.5v below v+ and about 3v above v-. in other words, the output swing is limited to +3.5v to -2v when operating from ?v. the typical operating characteristics graphs show typical r ds(on) , for ?5v, ?0v, and ?v power supplies. maxim tests and guarantees the MAX378/max379 for operation from ?.5v to ?8v supplies. the switching delays are increased by about a factor of 2 at ?v, but break- before-make action is preserved. the MAX378/max379 can be operated with a single +9v to +22v supply, as well as asymmetrical power supplies such as +15v and -5v. the digital threshold will remain approximately 1.6v above gnd and the analog character- istics such as r ds(on) are determined by the total voltage difference between v+ and v-. connect v- to 0v when operating with a +9v to +22v single supply. this means that the MAX378/max379 will operate with standard ttl-logic levels, even with ?v power sup- plies. in all cases, the threshold of the en pin is the same as the other logic inputs. table 1a. MAX378 charge injection test conditions: c l = 1000pf on multiplexer output; the tabu- lated analog input level is applied to channel 1; channels 2 through 8 are open circuited. en = +5v, a1 = a2 = 0v, a0 is toggled at 2khz rate between 0v and 3v. +100pc of charge creates a +100mv step when injected into a 1000pf load capacitance. supply voltage analog input level injected charge ?v +1.7v 0v -1.7v +100pc +70pc +45pc ?0v +5v 0v -5v +200pc +130pc +60pc ?5v +10v 0v -10v +500pc +180pc +50pc
MAX378/max379 high-voltage, fault-protected analog multiplexers _______________________________________________________________________________________ 9 digital interface levels the typical digital threshold of both the address lines and the en pin is 1.6v, with a temperature coefficient of about -3mv/?. this ensures compatibility with 0.8v to 2.4v ttl-logic swings over the entire temperature range. the digital threshold is relatively independent of the supply voltages, moving from 1.6v typical to 1.5v typical as the power supplies are reduced from ?5v to ?v. in all cases, the digital threshold is referenced to gnd. the digital inputs can also be driven with cmos-logic levels swinging from either v+ to v- or from v+ to gnd. the digital input current is just a few nanoamps of leak- age at all input voltage levels, with a guaranteed maxi- mum of 1?. the digital inputs are protected from esd by a 30v zener diode between the input and v+, and can be driven ?v beyond the supplies without drawing excessive current. operation as a demultiplexer the MAX378/max379 will function as a demultiplexer, where the input is applied to the out pin, and the input pins are used as outputs. the MAX378/max379 pro- vide both break-before-make action and full fault protec- tion when operated as a demultiplexer, unlike earlier generations of fault-protected multiplexers. channel-to-channel crosstalk, off isolation, and digital feedthrough at dc and low frequencies, channel-to-channel crosstalk is caused by variations in output leakage cur- rents as the off-channel input voltages are varied. the MAX378 output leakage varies only a few picoamps as all seven off inputs are toggled from -10v to +10v. the output voltage change depends on the impedance level at the MAX378 output, which is r ds(on) plus the input signal source resistance in most cases, since the load driven by the MAX378 is usually a high impedance. for a signal source impedance of 10k or lower, the dc crosstalk exceeds 120db. table 2 shows typical ac crosstalk and off-isolation per- formance. digital feedthrough is masked by the analog charge injection when the output is enabled. when the output is disabled, the digital feedthrough is virtually unmeasurable, since the digital pins are physically iso- lated from the analog section by the gnd and v- pins. the ground plane formed by these lines is continued onto the MAX378/max379 die to provide over 100db isolation between the digital and analog sections. table 1b. max379 charge injection +1.7v 0v -1.7v +105pc +73pc +48pc ?0v +5v 0v -5v +215pc +135pc +62pc ?5v +10v 0v -10v +525pc +180pc +55pc ?v test conditions: c l = 1000pf on out a and out b; the tabulat- ed analog input level is applied to inputs 1a and 1b; channels 2 through 4 are open circuited. en = +5v, a1 = 0v, a0 is tog- gled from 0v to 3v at a 2khz rate. +107pc +74pc +50pc +220pc +139pc +63pc +530pc +185pc +55pc out a out b injected charge -2pc -1pc -2pc -5pc -4pc -1pc -5pc -5pc 0pc differential a-b supply voltage analog input level table 2a. typical off-isolation rejection ratio test conditions: v in = 20v p-p at the tabulated frequency, r l = 1.5k between out and gnd, en = 0v. 20v p-p oirr = 20 log ____________ v out (p-p) frequency 100khz 500khz 1mhz one channel driven 74db 72db 66db all channels driven 64db 48db 44db table 2b. typical crosstalk rejection ratio test conditions: specified r l connected from out to gnd, en = +5v, a0 = a1 = a2 = +5v (channel 1 selected). 20v p-p at the tabulated frequency is applied to channel 2. all other channels are open circuited. similar crosstalk rejection can be observed between any two channels. frequency 100khz 500khz 1mhz f l = 1.5k 70db 68db 64db r l = 10k 62db 46db 42db
MAX378/max379 high-voltage, fault-protected analog multiplexers 10 ______________________________________________________________________________________ _____________________________________________pin configurations (continued) 24 23 22 21 20 19 18 17 1 2 3 4 5 6 7 8 a1 a2 gnd n.c. n.c. n.c. en a0 top view v+ in5 in6 n.c. in3 in2 in1 v- 16 15 14 13 9 10 11 12 in7 n.c. n.c. in8 out n.c. n.c. in4 so MAX378 24 23 22 21 20 19 18 17 1 2 3 4 5 6 7 8 a1 n.c. gnd n.c. n.c. n.c. en a0 v+ in1b in2b in3b in3a in2a in1a v- 16 15 14 13 9 10 11 12 in4b n.c. n.c. outb outa n.c. n.c. in4a so lcc lcc max379 14 15 16 17 18 4 5 6 7 8 3 2 1 20 19 9 10 11 12 13 MAX378 v- in1 n.c. in2 in3 gnd v+ n.c. in5 in6 en a0 n.c. a1 a2 in4 out n.c. in8 in7 14 15 16 17 18 4 5 6 7 8 3 2 1 20 19 9 10 11 12 13 max379 v- in1a n.c. in2a in3a v+ in1b n.c. in2b in3b en a0 n.c. a1 gnd in4a outa n.c. outb in4b
MAX378/max379 high-voltage, fault-protected analog multiplexers ______________________________________________________________________________________ 11 _ordering information (continued) * contact factory for availability. **the substrate may be allowed to float or be tied to v+ (ji cmos). _________________chip topographies gnd v+ in5 in6 in7 in7 in8 out MAX378 in4 a0 0.229" (5.816mm) 0.151" (3.835mm) a2 a1 en v- note: connect substrate to v+ or leave it floating. note: connect substrate to v+ or leave it floating. in1 in2 in3 gnd v+ in1b in2b in3b in4b outb outa max379 in4a a0 0.229" (5.816mm) 0.151" (3.835mm) a1 en v- in1a in2a in3a part max379 cpe max379cwg max379cje 0? to +70? 0? to +70? 0? to +70? temp. range pin-package 16 plastic dip 24 wide so 16 cerdip max379epe max379ewg -40? to +85? -40? to +85? 16 plastic dip 24 wide so max379eje max379mje -55? to +125? -40? to +85? 16 cerdip 16 cerdip max379mlp -55? to +125? 20 lcc* max379c/d 0? to +70? dice**
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. 12 __________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 (408) 737-7600 1994 maxim integrated products printed usa is a registered trademark of maxim integrated products. MAX378/max379 high-voltage, fault-protected 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. 12 __________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 (408) 737-7600 1994 maxim integrated products printed usa is a registered trademark of maxim integrated products. ________________________________________________________package information dim a a1 b c e e h l min 0.093 0.004 0.014 0.009 0.291 0.394 0.016 max 0.104 0.012 0.019 0.013 0.299 0.419 0.050 min 2.35 0.10 0.35 0.23 7.40 10.00 0.40 max 2.65 0.30 0.49 0.32 7.60 10.65 1.27 inches millimeters 21-0042a wide so small-outline package (0.300 in.) dim d d d d d min 0.398 0.447 0.496 0.598 0.697 max 0.413 0.463 0.512 0.614 0.713 min 10.10 11.35 12.60 15.20 17.70 max 10.50 11.75 13.00 15.60 18.10 inches millimeters pins 16 18 20 24 28 1.27 0.050 l h e d e a a1 c 0? 8 0.101mm 0.004in. b c a a2 e1 d e e a e b a3 b1 b dim a a1 a2 a3 b b1 c d d1 e e1 e e a e b l a min ? 0.015 0.125 0.055 0.016 0.050 0.008 0.745 0.005 0.300 0.240 ? 0.115 0? max 0.200 ? 0.150 0.080 0.022 0.065 0.012 0.765 0.030 0.325 0.280 0.400 0.150 15? min ? 0.38 3.18 1.40 0.41 1.27 0.20 18.92 0.13 7.62 6.10 ? 2.92 0? max 5.08 ? 3.81 2.03 0.56 1.65 0.30 19.43 0.76 8.26 7.11 10.16 3.81 15? inches millimeters 2.54 bsc 7.62 bsc 0.100 bsc 0.300 bsc a1 l d1 e 21-587a a 16-pin plastic dual-in-line package

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