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ICM7249

August 1997

5

1

/

2

Digit LCD,

Micro-Power Event/Hour Meter

Description

The ICM7249 Timer/Counter is intended for long-term

battery-supported industrial applications. The ICM7249

typically draws 1碌A(chǔ) during active timing or counting, due to

Intersil鈥?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.

Features

鈥?Hour Meter Requires Only 4 Parts Total

鈥?Micropower Operation: < 1碌A(chǔ) at 2.8V (Typ)

鈥?10 Year Operation On One Lithium Cell. 2

1

/

2

Year

Battery Life with Display Connected

鈥?Directly Drives 5

1

/

2

Digit LCD

鈥?14 Programmable Modes of Operation

鈥?Times Hrs., 0.1 Hrs., 0.01 Hrs., 0.1 Mins.

鈥?Counts 1鈥檚, 10鈥檚, 100鈥檚, 1000鈥檚

鈥?Dual Function Input Circuit

- Selectable Debounce for Counter

- High-Pass Filter for Timer

鈥?Direct AC Line Triggering with Input Resistor

鈥?Winking 鈥淭imer Active鈥?Display Output

鈥?Display Test Feature

Pinout

ICM7249

(PDIP)

TOP VIEW

b6/c6

f5

g5

e5

d5

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

48 DT

47 S/S

46 C3

45 C2

44 C1

43 C0

42 GND

41 OSC OUTPUT

40 OSC INPUT

39 V

DD

38 BP

37 W

36 a1

35 b1

34 c1

33 d1

32 e1

31 g1

30 f1

29 a2

28 b2

27 c2

26 d2

25 e2

Applications

鈥?AC or DC Hour Meters

鈥?AC or DC Totalizers

鈥?Portable Battery Powered Equipment

鈥?Long Range Service Meters

c5

b5

a5

Ordering Information

PART NUMBER

ICM7249IPM

TEMP.

RANGE (

o

C)

-20 to 85

PACKAGE

48 Ld PDIP

PKG.

NO.

E48.6

f4

g4

e4

d4

c4

b4

a4

f3

g3

e3

d3

c3

b3

a3

f2

g2

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

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

|

Copyright

漏

Intersil Corporation 1999

File Number

3170.1

9-23

next

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