Single/Dual/Quad, Micropower,

Ultra-Low-Voltage, Rail-to-Rail I/O Comparators

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7

________________________________________________Pin Descriptions (continued)

_______________Detailed Description

The MAX965–MAX970 single/dual/quad, micropower,

inputs and outputs and an internal 1.235V ±1.5%

bandgap reference. These devices operate from a sin-

gle +1.6V to +5.5V supply voltage range, and consume

less than 5µA supply current per comparator over the

extended temperature range. Internal hysteresis is pro-

grammable up to ±50mV using two external resistors

and the device’s internal reference. The rail-to-rail input

common-mode voltage range and the open-drain out-

puts allow easy voltage-level conversion for multivolt-

age systems. All inputs and outputs can tolerate a

continuous short-circuit fault condition to either rail.

The MAX965 is a single comparator with adjustable

hysteresis and a reference output pin. The MAX966 is a

dual comparator without the reference and without

adjustable hysteresis. The MAX967 is a dual compara-

tor configured as a dual voltage monitor with common

hysteresis adjustment and a reference output. The dual

MAX968 is similar to the MAX967, but is configured as

a window comparator. The MAX969 is a quad com-

parator with a common hysteresis adjustment and a ref-

erence output pin. The MAX970 is a quad comparator

without a reference and without hysteresis adjustment.

(See Functional Diagrams and Selector Guide.)

Comparator Input

mon-mode range. Both comparator inputs may operate

at any differential voltage within the common-mode

voltage range, and the comparator displays the correct

output logic state.

The minimum operating voltage is 1.6V. As the supply

voltage falls below 1.6V, performance degrades

and supply current falls. The reference does not

MAX969/MAX970

FUNCTION

MAX969

SO

4

4

Comparator A Inverting Input

3

3

Positive Supply Voltage, +1.6V to +5.5V

2

2

Comparator A Open-Drain Output

1

1

Comparator B Open-Drain Output

8

—

Internal Reference Output. Typically 1.235V with respect to GND.

—

—

No Connection. Not internally connected.

7

7

Comparator B Noninverting Input

6

6

Comparator B Inverting Input

5

5

Comparator A Noninverting Input

MAX970

QSOP

4

3

2

1

—

8, 9

7

6

5

NAME

INA-

VCC

OUTA

OUTB

REF

N.C.

INB+

INB-

INA+

PIN

9

—

—

HYST

Hysteresis Input. Connect to REF if not used. Input voltage range is

10

8

10

INC-

Comparator C Inverting Input

11

9

11

INC+

Comparator C Noninverting Input

12

10

12

IND-

Comparator D Inverting Input

13

11

13

IND+

Comparator D Noninverting Input

14

12

14

GND

Ground

15

13

15

OUTD

Comparator D Open-Drain Output

16

14

16

OUTC

Comparator C Open-Drain Output