Maxim MAX379MLP, MAX379MJE, MAX379EWG, MAX379EPE, MAX379EJE Datasheet

_______________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 cur­rent 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’s first­generation fault-protected muxes. First, the Maxim protec­tion scheme limits fault currents to nanoamp leakage
values rather than many milliamperes. This prevents dam­age to sensors or other sensitive signal sources. Second,
the MAX378/MAX379 fault-protected muxes can withstand
a

continuous

±60V input, unlike the first generation, which
had a continuous ±35V 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 requir­ing 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 ±75V with Power Supplies Off
♦ Fault Input Voltage ±60V with ±15V 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 ±4.5V to ±18V 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

MAX378CPE

MAX378CWG
MAX378CJE 0°C to +70°C

0°C to +70°C

0°C to +70°C

TEMP. RANGE PIN-PACKAGE

16 Plastic DIP
24 Wide SO
16 CERDIP

MAX378EPE
MAX378EWG -40°C to +85°C

-40°C to +85°C 16 Plastic DIP
24 Wide SO

MAX378EJE
MAX378MJE -55°C to +125°C

-40°C to +85°C 16 CERDIP
16 CERDIP

MAX378MLP -55°C to +125°C 20 LCC*

Pin Configurations continued at end of data sheet.

MAX378C/D 0°C to +70°C Dice**

MAX378/MAX379

High-Voltage, Fault-Protected
Analog Multiplexers

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(V+ = +15V, V- = -15V; VAH(Logic Level High) = +2.4V, VAL(Logic Level Low) = +0.8V, unless otherwise noted.)

Stresses beyond those listed under “Absolute 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..............................±65V

Recommended V+.....................................+15V

Power Supplies V-.......................................-15V

Analog Input with Multiplexer Power Off..............................±80V

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°C to +70°C

MAX378/379E..................................................-40°C to +85°C

MAX378/379M ...............................................-55°C to +125°C

Storage Temperature Range.............................-65°C to +150°C

(Note 4)

VIN= ±60V, V

OUT

= ±10V

(Notes 3, 4)

(Note 2)
MAX379 only

(Note 6)

VA= 5V or 0V (Note 5)

V

OUT

= 0V, VIN= ±60V

(Notes 3, 4)

(Note 4)

µA-1.0 1.0I

A

Input Leakage Current
(High or Low)

V2.4V

AH

Input High Threshold

-100 100

kΩ

3.0 4.0

V0.8V

AL

Input Low Threshold

µA25I

IN(OFF)

Input Leakage Current
(with Overvoltage)

µA10

V-15 +15V

AN

Analog Signal Range

nA-50 50I

DIFF

Differential OFF Output
Leakage Current

nA20

I

OUT(OFF)

Output Leakage Current
(with Input Overvoltage)

VEN, V

A

{

{}

Note 1: Derate 12.8mW/°C above TA= +75°C

V

OUT

= ±10V, IIN= 100µA

VAL= 0.8V, VAH= 2.4V

2.0 3.0

r

DS(ON)

ON Resistance

Full

+25°C

Full
Full

Full

+25°C

Full

+25°C

-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

VIN= ±10V, V

OUT

= 10V

V

EN

= 0.8V (Note 6)

-0.5 0.03 0.5

I

IN(OFF)

OFF Input Leakage Current

+25°C

-50 50

-1.0 0.03 1.0

nA-200 200

V

OUT

= ±10V, VIN= 10V
VEN= 0.8V MAX378
(Note 6) MAX379

-1.0 0.1 1.0

I

OUT(OFF)

OFF Output Leakage Current

+25°C

-200 200

-2.0 0.1 2.0

nA-600 600

V

IN(ALL)

= V

OUT

= ±10V
VAH= VEN= 2.4V MAX378
VAL= 0.8V (Note 5) MAX379

-10 0.1 10

I

OUT(ON)

ON Channel Leakage Current

+25°C

-600 600

-20 0.1 20

-300 300 -300 300

VIN= ±75V, VEN= V

OUT

= 0V

A0= A1= A2= 0V or 5V

µA10I

IN(OFF)

Input Leakage Current
(with Power Supplies Off)

+25°C 20

MIN TYP MAX MIN TYP MAX

CONDITIONS UNITS

-55°C to +125°C

SYMBOLPARAMETER TEMP

0°C to +70°C

and

-40°C to +85°C

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’s 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 50µA. 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°C.
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 ±15V are used.

ELECTRICAL CHARACTERISTICS (continued)

(V+ = +15V, V- = -15V; VAH(Logic Level High) = +2.4V, VAL(Logic Level Low) = +0.8V, unless otherwise noted.)

pF0.1C

DS(OFF)

Input to Output Capacitance

VEN= 0.8V or 2.4V
All VA= 0V or 5V

+25°C

VEN= 0.8V, RL= 1kΩ, CL= 15pF
V = 7V

RMS

, f = 100kHz

(Note 7)

MAX378
MAX379

CONDITIONS

0.1

V±4.5 ±18V

OP

Power-Supply Range for
Continuous Operation

0.3 0.7

ns

1000

mA

0.1 0.6

I+Positive Supply Current

pF5C

A

Digital Input Capacitance

12

dB50 68OFF

(ISO)

“OFF Isolation”

pF5C

IN(OFF)

Channel Input Capacitance

pF

25

C

OUT(OFF)

Channel Output Capacitance

UNITS

-55°C to +125°C

SYMBOLPARAMETER

Figure 3

400 750

t

ON(EN)

Enable Delay (ON)

+25°C

+25°C

+25°C
+25°C

+25°C

+25°C

TEMP

+25°C

±4.5 ±18

0.5 1.0

1500

0.2 1.0

5

12

50 68

5

25

0°C to +70°C

and

-40°C to +85°C

400 1000

µs

3.5

1.2

t

SETT

Settling Time (0.1%)

(0.01%)

+25°C

3.5

1.2

Figure 1 µs0.5 1.0t

A

Access Time +25°C 0.5 1.0

VEN= +5V, VIN= ±10V
A0, A1, A2strobed

ns25 200tON-t

OFF

Break-Before-Make Delay
(Figure 2)

+25°C 25 200

ns

1000

Figure 3

300 500

t

OFF(EN)

Enable Delay (OFF)

+25°C

1000

300

VEN= 0.8V or 2.4V
All VA= 0V or 5V

0.02 0.2

mA

0.01 0.1

I-Negative Supply Current

+25°C

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

10µ

MAX378-1

V

IN

(V)

INPUT CURRENT (A)

0

100n

100p

10n

100µ

1µ

-80V

+80V

OPERATING

RANGE

100µ

1p

-120 -60 60 120

OFF CHANNEL LEAKAGE CURRENT vs.
INPUT VOLTAGE WITH ±15V SUPPLIES

100p

1µ

MAX378-2

V

IN

(V)

I

IN(OFF)

(A)

0

10n

10p

1n

10µ

100n

OPERATING

RANGE

-60V

+60V

10n

1p

-120 -60 60 120

OUTPUT LEAKAGE CURRENT vs. OFF CHANNEL

OVERVOLTAGE WITH ±15V 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)

(kΩ)

10

1

3

2

4

5

6

7

±5V

SUPPLIES

±15V

SUPPLIES

+13V

+13V

+3.5V +4V

__________________________________________Typical Operating Characteristics

NOTE: Typical R

DS(ON)

match @ +10V
Analog in (±15V 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: VAH = 3.0V

0V

-10V

OUTPUT A

90%

+10V

50%

t

A

A0

10V

±

EN

10M

50Ω

±10V

ADDRESS

DRIVE (V

A

)

Figure 1. Access Time vs. Logic Level (High)