MAX954C/D View Datasheet(PDF) - Maxim Integrated

Part Name

Description

MFG CO.

MAX954C/D

Ultra-Low-Power, Single-Supply Op Amp + Comparator + Reference

Maxim Integrated 

MAX951–MAX954

Ultra-Low-Power, Single-Supply

Op Amp + Comparator + Reference

by the high-input-impedance op amp of a MAX951 (Figure

6). The comparator and resistor voltage divider set an

alarm threshold to indicate a fire.

Design and fabrication of the connection from the interme-

diate plate of the ionization chamber to the noninverting

input of the op amp is critical, since the impedance of this

node must be well above 50MΩ. This connection must be

as short and direct as possible to prevent charge leakage

and 60Hz interference. Where possible, the grounded

outer electrode or chassis of the ionization chamber

should shield this connection to reduce 60Hz interfer-

ence. Pay special attention to board cleaning, to prevent

leakage due to ionic compounds such as chlorides, flux,

and other contaminants from the manufacturing process.

Where applicable, a coating of high-purity wax may be

used to insulate this connection and prevent leakage due

to surface moisture or an accumulation of dirt.

Ordering Information

PART

TEMP RANGE

PIN-PACKAGE

MAX951C/D

0°C to +70°C

Dice*

MAX951EPA

-40°C to +85°C 8 Plastic Dip

MAX951ESA

-40°C to +85°C 8 SO

MAX951EUA

-40°C to +85°C 8 µMAX

MAX951MJA

-55°C to +125°C 8 CERDIP**

MAX952C/D

0°C to +70°C

Dice*

MAX952EPA

-40°C to +85°C 8 Plastic Dip

MAX952ESA

-40°C to +85°C 8 SO

MAX952EUA

-40°C to +85°C 8 µMAX

MAX952MJA

-55°C to +125°C 8 CERDIP**

MAX953C/D

0°C to +70°C

Dice*

MAX953EPA

-40°C to +85°C 8 Plastic Dip

MAX953ESA

-40°C to +85°C 8 SO

MAX953EUA

-40°C to +85°C 8 µMAX

MAX953MJA

-55°C to +125°C 8 CERDIP**

MAX954C/D

0°C to +70°C

Dice*

MAX954EPA

-40°C to +85°C 8 Plastic Dip

MAX954ESA

-40°C to +85°C 8 SO

MAX954EUA

-40°C to +85°C 8 µMAX

MAX954MJA

-55°C to +125°C 8 CERDIP**

*Dice are tested at TA = +25°C, DC parameters only.

**Contact factory for availability and processing to MIL-STD-883.

Chip Topography

AMPOUT

AMPIN-

AMPIN+

VDD

COMPOUT

0.084"

(2.134mm)

REF(COMPIN-)

VSS

0.058"

(1.473mm)

( ) ARE FOR MAX953/MAX954

COMPIN+

Chip Information

TRANSISTOR COUNT: 163

SUBSTRATE CONNECTED TO VDD

Typical Operating Circuit

0.1µF

INPUT

AMPIN+

3

2

1MΩ

R2

R1

8 VCC

MAX951

MAX952

15

6

REF 1.20V

4 VSS

COMPOUT

7

Package Information

For the latest package outline information and land patterns

(footprints), go to www.maximintegrated.com/packages. Note

that a “+”, “#”, or “-” in the package code indicates RoHS status

only. Package drawings may show a different suffix character, but

the drawing pertains to the package regardless of RoHS status.

www.maximintegrated.com

Maxim Integrated │  12

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