9-23

August 1997

ICM7249

Micro-Power Event/Hour Meter

Features

• Hour Meter Requires Only 4 Parts Total

• Micropower Operation: < 1

µA at 2.8V (Typ)

Battery Life with Display Connected

• 14 Programmable Modes of Operation

• Times Hrs., 0.1 Hrs., 0.01 Hrs., 0.1 Mins.

• Counts 1’s, 10’s, 100’s, 1000’s

• Dual Function Input Circuit

- Selectable Debounce for Counter

- High-Pass Filter for Timer

• Direct AC Line Triggering with Input Resistor

• Winking “Timer Active” Display Output

• Display Test Feature

Applications

• AC or DC Hour Meters

• AC or DC Totalizers

• Portable Battery Powered Equipment

• Long Range Service Meters

Description

The ICM7249 Timer/Counter is intended for long-term

battery-supported industrial applications. The ICM7249

typically draws 1

µA during active timing or counting, due to

Intersil’ special low-power design techniques. This allows

more than 10 years of continuous operation without battery

replacement. The chip offers four timing modes, eight

counting modes and four test modes.

The ICM7249 is a 48 lead device, powered by a single DC

voltage source and controlled by a 32.768kHz quartz crystal.

No other external components are required. Inputs to the

chip are TTL-compatible and outputs drive standard direct

drive LCD segments.

Pinout

ICM7249

(PDIP)

TOP VIEW

Ordering Information

PART NUMBER

TEMP.

PACKAGE

PKG.

NO.

ICM7249IPM

-20 to 85

48 Ld PDIP

E48.6

C1

C0

GND

OSC OUTPUT

OSC INPUT

BP

W

a1

b1

c1

d1

e1

g1

f1

a2

b2

c2

d2

e2

DT

S/S

C3

C2

48

47

46

45

17

5

6

7

8

9

10

11

12

13

14

15

16

18

19

20

21

22

23

24

d5

c5

b5

a5

f4

g4

e4

d4

c4

b4

a4

f3

g3

e3

d3

c3

b3

a3

f2

g2

32

44

43

42

41

40

39

38

37

36

35

34

33

31

30

29

28

27

26

25

1

2

3

4

b6/c6

f5

g5

e5

File Number

3170.1

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

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