10

FN6152.3

November 5, 2007

Pin Descriptions

Applications Information

Introduction

The ISL28196 and ISL28197 are CMOS rail-to-rail input and

output (RRIO) micropower comparators. These devices are

designed to operate from single supply (1.8V to 5.5V) and

have an input common mode range that extends to the

positive rail and to the negative supply rail for true rail-to-rail

performance. The CMOS output can swing within tens of

millivolts to the rails. Featuring worst case maximum supply

currents of only 4.5µA and 2µA for the ISL28196 and

ISL28197 respectively, these comparators are ideally suited

for solar and battery powered applications.

Input Protection

All input terminals have internal ESD protection diodes to both

positive and negative supply rails, limiting the input voltage to

within one diode beyond the supply rails. Both the ISL28196

and ISL28197 have a maximum input differential voltage that

Rail-to-Rail Output

A pair of complementary MOSFET devices are used to

achieve the rail-to-rail output swing. The NMOS sinks

current to swing the output in the negative direction. The

PMOS sources current to swing the output in the positive

direction. The ISL28196 and ISL28197 with a 100k

Ω load

will swing to within 6mV of the positive supply rail and within

3mV of ground.

FIGURE 41. ISL28196 FALL TIME vs TEMPERATURE 20% TO

FIGURE 42. ISL28197 FALL TIME vs TEMPERATURE 20% TO

4.5

5.0

5.5

6.0

6.5

7.5

8.0

-40

-20

0

20

406080

100

120

MIN

MAX

MEDIAN

N = 1000

TEMPERATURE (°C)

7.0

4.5

9.5

14.5

19.5

24.5

29.5

34.5

39.5

44.5

49.5

54.5

-40

-20

0

20

40

60

80

100

120

MIN

MAX

MEDIAN

N = 1000

TEMPERATURE (°C)

ISL28196,

ISL28197

(6 LD SOT-23)

ISL28196,

ISL28197

(6 LD µTDFN)

PIN NAME

EQUIVALENT

CIRCUIT

DESCRIPTION

1

4

OUT

Circuit 3

Comparator output

2

2

GND

Circuit 4

GROUND terminal

3

3

IN+

Circuit 1

Comparator non-inverting input

4

1

IN-

Circuit 1

Comparator inverting input

5

5

EN

Circuit 2

Comparator enable pin; Logic “1” selects the enabled state: Logic “0” selects the

disabled state

6

6

V+

Circuit 4

Positive power supply

LOGIC

PIN

V+

V-

V+

V-

OUT

CIRCUIT 3

CIRCUIT 1

CIRCUIT 2

V+

V-

CAPACITIVELY

COUPLED

ESD CLAMP

CIRCUIT 4

IN-

V+

V-

IN+

100

Ω

ISL28196, ISL28197