3-33

August 1997

ICL7139, ICL7149

Autoranging Multimeter

Features

• 13 Ranges - ICL7139

- 4 DC Voltage 400mV, 4V, 40V, 400V

- 1 AC Voltage 400V

- 4 DC Current 4mA, 40mA, 400mA, 4A

- 4 Resistance 4k

Ω, 40kΩ, 400kΩ, 4MΩ

• 18 Ranges - ICL7149

- 4 DC Voltage 400mV, 4V, 40V, 400V

- 2 AC Voltage with Optional AC Circuit

- 4 DC Current 4mA, 40mA, 400mA, 4A

- 4 AC Current with Optional AC Circuit

- 4 Resistance 4k

Ω, 40kΩ, 400kΩ, 4MΩ

• Autoranging - First Reading is Always on Correct Range

• On-Chip Duplex LCD Display Drive Including Three Dec-

imal Points and 11 Annunciators

• No Additional Active Components Required

• Low Power Dissipation - Less than 20mW - 1000 Hour

Typical Battery Life

• Display Hold Input

• Continuity Output Drives Piezoelectric Beeper

• Low Battery Annunciator with On-Chip Detection

• Guaranteed Zero Reading for 0V Input on All Ranges

Description

The Intersil ICL7139 and ICL7149 are high performance, low

power, auto-ranging digital multimeter lCs. Unlike other

autoranging multimeter ICs, the ICL7139 and ICL7149

always display the result of a conversion on the correct

range. There is no “range hunting” noticeable in the display.

The unit will autorange between the four different ranges. A

manual switch is used to select the 2 high group ranges. DC

current ranges are 4mA and 40mA in the low current group,

and 400mA and 4A in the high current group. Resistance

measurements are made on 4 ranges, which are divided into

two groups. The low resistance ranges are 4/40k

Ω. The high

resistance ranges are 0.4/4M

Ω. Resolution on the lowest

range is 1

Ω.

Pinouts

Ordering Information

PART NUMBER

TEMP.

PACKAGE

PKG. NO.

ICL7139CPL

0 to 70

40 Ld PDIP

E40.6

ICL7149CPL

0 to 70

40 Ld PDIP

E40.6

ICL7149CM44

0 to 70

44 Ld MQFP

Q44.10x10

ICL7139, ICL7149 (PDIP)

TOP VIEW

ICL7149 (MQFP)

TOP VIEW

13

1

2

3

4

5

6

7

8

9

10

11

12

14

15

16

17

18

19

20

POL/AC

BP2

BP1

V+

V-

LO

Ω

HI

Ω

DEINT

COMMON

INT 1

INT V/

Ω

TRIPLE POINT

BEEPER OUT

mA/

µA

V/

Ω/A

HI

Ω-DC/LOΩ-AC

HOLD

28

40

39

38

37

36

35

34

33

32

31

30

29

27

26

25

24

23

22

21

LO BAT/V

M

Ω/µA

Ω/A

k/m

OSC IN

OSC OUT

1

2

3

4

5

6

7

8

9

10

11

12 13 14 15 16 17

28

27

26

25

24

23

22

21

20

19

18

39 38 37 36 35 34

33

32

31

30

29

44 43 42 41 40

M

Ω/µA

Ω/A

k/m

OSC IN

OSC OUT

HOLD

BEEPER OUT

mA/

µA

V/

Ω/A

HI

Ω-DC/LOΩ-AC

NC

POL/AC

NC

BP2

BP1

V+

NC

File Number

3088.1

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

http://www.intersil.com or 407-727-9207