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Intersil Electronic Components Datasheet

ICM7249 Datasheet

Micro-Power Event/Hour Meter

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ICM7249 pdf
ICM7249
August 1997
51/2 Digit LCD,
Micro-Power Event/Hour Meter
Features
Description
• Hour Meter Requires Only 4 Parts Total
• Micropower Operation: < 1µA at 2.8V (Typ)
• 10 Year Operation On One Lithium Cell. 21/2 Year
Battery Life with Display Connected
• Directly Drives 51/2 Digit LCD
• 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
Ordering Information
TEMP.
PART NUMBER RANGE (oC)
PACKAGE
ICM7249IPM
-20 to 85 48 Ld PDIP
PKG.
NO.
E48.6
The ICM7249 Timer/Counter is intended for long-term
battery-supported industrial applications. The ICM7249
typically draws 1µA 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
b6/c6 1
f5 2
g5 3
e5 4
d5 5
c5 6
b5 7
a5 8
f4 9
g4 10
e4 11
d4 12
c4 13
b4 14
a4 15
f3 16
g3 17
e3 18
d3 19
c3 20
b3 21
a3 22
f2 23
g2 24
ICM7249
(PDIP)
TOP VIEW
48 DT
47 S/S
46 C3
45 C2
44 C1
43 C0
42 GND
41 OSC OUTPUT
40 OSC INPUT
39 VDD
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
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
http://www.intersil.com or 407-727-9207 | Copyright © Intersil Corporation 1999
9-23
File Number 3170.1



Intersil Electronic Components Datasheet

ICM7249 Datasheet

Micro-Power Event/Hour Meter

No Preview Available !

ICM7249 pdf
ICM7249
Functional Block Diagram
OSC
IN
OSC
OUT
S/S
V+
OSC
VOLTAGE
REGLATOR
215 DIVIDER
SWITCH
DEBOUNCE
1Hz 6 SEC
÷6 ÷6
32Hz
C0
C1
C2
C3
16
V-
÷2
1 SEG
DEC
÷10
4
7 SEG
DEC
÷10
7 SEG
DEC
÷10
7 SEG
DEC
÷10
7 SEG
DEC
÷10
4
7 SEG
DEC
÷10 ÷10 ÷10
WINK
SEG
1Hz DISPLAY
TEST
32Hz
B6 F5 G5
A1 W
BP DT
9-24



Intersil Electronic Components Datasheet

ICM7249 Datasheet

Micro-Power Event/Hour Meter

No Preview Available !

ICM7249 pdf
ICM7249
Absolute Maximum Ratings
Thermal Information
Supply Voltage (VDD - VSS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6V
Input Voltage, Pins 43 - 48 (Note 1) . . (VSS - 0.3V) to (VDD + 0.3V)
Operating Conditions
Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . -40oC to 85oC
Thermal Resistance (Typical, Note 2)
θJA (oC/W)
PDIP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
50
Maximum Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . 150oC
Maximum Storage Temperature Range . . . . . . . . . .-65oC to 150oC
Maximum Lead Temperature (Soldering, 10s) . . . . . . . . . . . . 300oC
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation
of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
NOTES:
1. Due to the SCR structure inherent in junction-isolated CMOS devices. the circuit can be put in a latchup mode it large currents are injected
into device inputs or outputs. For this reason special care should be taken in a system with multiple power supplies to prevent voltages
being applied to inputs or outputs before power is applied. If only inputs are affected, latchup also can be prevented by limiting the current
into the input terminal to less than 1mA.
2. θJA is measured with the component mounted on an evaluation PC board in free air.
Electrical Specifications
Temperature = -40oC to 85oC, VDD = 2.5V
Specifications Measured at Temperature =
2to5o5C.5Va,nVdSVSD=D
0V, Unless Otherwise Specified. Typical
= 2.8V, Unless Otherwise Specified
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
Operating Voltage, VDD
Operating Current, IDD
INPUT CURRENT
Note 1
All Inputs = VDD or GND, Note 2
VDD = 2.8V
VDD = 5.5V
2.5
-
-
- 5.5
1.0 10.0
4.0 20.0
V
µA
µA
C0 - C3, IIN
S/S, ISS
DT, IDT
INPUT VOLTAGE
All Inputs VDD or GND
VDD = 2.8V
Note 3
0.0 -
1 µA
0.5 1.5 3.0 µA
40.0 - 110 µA
C0 - C3, DT, S/S
VIL
VIH
Segment Output Voltage
VOL IOL = 1µA
VOH
IOH = 1µA
Backplane Output Voltage
VOL IOL = 10µA
VOH
IOH = 10µA
OSCILLATOR STABILITY
Temperature = 25oC, VDD = 2.5V to 5.5V
Temperature = -40oC to 85oC, VDD = 2.5V to 5.5V
S/S PULSE WIDTH
-
0.7VDD
-
VDD - 0.8
-
VDD - 0.8
-
-
-
-
-
-
- 0.1
-5
0.3VDD
-
0.8
-
0.8
-
V
V
V
V
V
V
- ppm
- ppm
High-Pass Filter (Modes 0 - 3), tHP
5
-
10,000
µs
Debounce (Modes 4, 6, 8, 10), tDE
10,000
-
- µs
Without Debounce (Modes 5, 7, 9, 11), tDE
5 - - µs
NOTES:
1. Internal reset to 00000 requires a maximum VDD rise time of 1µs. Longer rise times at power-up may cause improper reset.
2. Operating current is measured with the LCD disconnected, and input current ISS and IDT supplied externally.
3. Inputs C0 - C3 are latched internally and draw no DC current after switching. During switching, a 90µA peak current may be drawn for 10ns.
9-25




Part Number ICM7249
Description Micro-Power Event/Hour Meter
Maker Intersil Corporation
Total Page 9 Pages
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