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Intersil Electronic Components Datasheet

ICM7224 Datasheet

41/2 Digit LCD Display Counter

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ICM7224 pdf
May 2001
®
NO RECOOBMSOMLEENTDEEPDRROEDPULCATCEMENT
ICM7224
41/2 Digit LCD Display Counter
Features
• High Frequency Counting - Guaranteed 15MHz, Typically
25MHz at 5V
• Low Power Operation - Typically Less Than 100µW
Quiescent
• STORE and RESET Inputs Permit Operation as
Frequency or Period Counter
• True COUNT INHIBIT Disables First Counter Stage
• CARRY Output for Cascading Four-Digit Blocks
• Schmitt-Trigger on the COUNT Input Allows Operation
in Noisy Environments or with Slowly Changing Inputs
• Leading Zero Blanking INput and OUTput for Correct
Leading Zero Blanking with Cascaded Devices
• Provides Complete Onboard Oscillator and Divider
Chain to Generate Backplane Frequency, or
Backplane Driver May be Disabled Allowing Segments
to be Slaved to a Master Backplane Signal
Pinout
ICM7224
(PDIP)
TOP VIEW
Description
The ICM7224 device is a high-performance, CMOS 41/2
digit counter, including decoder, output latch, display driver,
count inhibit, leading zero blanking, and reset circuitry.
The counter section provides direct static counting, guaran-
teed from DC to 15MHz, using a 5V ±10% supply over the
operating temperature range. At normal ambient tempera-
tures, the devices will typically count up to 25MHz. The
COUNT input is provided with a Schmitt trigger to allow
operation in noisy environments and correct counting with
slowly changing inputs. The COUNT INHIBIT, STORE and
RESET inputs allow a direct interface with the ICM7207 and
ICM7207A to implement a low cost, low power frequency
counter with a minimum component count.
These devices also incorporate several features intended to
simplify cascading four-digit blocks. The CARRY output
allows the counter to be cascaded, while the Leading Zero
Blanking INput and OUTput allows correct Leading Zero
Blanking between four-decade blocks. The BackPlane driver
of the LCD devices may be disabled, allowing the segments
to be slaved to another backplane signal, necessary when
using an eight or twelve digit, single backplane display.
These devices provide maximum count of 19999. The
display drivers are not of the multiplexed type and each dis-
play segment has its own individual drive pin, providing high
quality display outputs.
VDD
E1
G1
F1
BP
A2
B2
C2
D2
E2
G2
F2
A3
B3
C3
D3
E3
G3
F3
A4
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
40 D1
39 C1
38 B1
37 A1
36 OSCILLATOR
35 VSS
34 STORE
33 RESET
32 COUNT
31 COUNT INHIBIT
30 LZB OUT
29 LZB IN
28 CARRY
27 1/2 - DIGIT
26 F4
25 G4
24 E4
23 D4
22 C4
21 B4
Part Number Information
TEMP.
PART NUMBER RANGE (oC)
PACKAGE
ICM7224IPL
-25 to 85 40 Ld PDIP
PKG.
NO.
E40.6
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2002. All Rights Reserved
1
File Number 3168.2



Intersil Electronic Components Datasheet

ICM7224 Datasheet

41/2 Digit LCD Display Counter

No Preview Available !

ICM7224 pdf
Functional Block Diagram
ICM7224
LSD
DIGIT 1
SEGMENT OUTPUTS
DIGIT 2
SEGMENT OUTPUTS
7 WIDE DRIVER
7 WIDE DRIVER
DIGIT 3
SEGMENT OUTPUTS
DIGIT 4
SEGMENT OUTPUTS
7 WIDE DRIVER
7 WIDE DRIVER
MSD
1/2 DIGIT
OUTPUT
1/2 DIGIT
DRIVER
STORE
7 WIDE LATCH
7 WIDE LATCH
LEADING
ZERO
BLANKING
OUTPUT
COUNT
INHIBIT
COUNT
INPUT
SCHMITT
TRIGGER
RESET
DECODER
Q
÷2
CL
R
CL
÷5
Q
R
DECODER
Q
÷2
CL
R
CL
÷5
Q
R
OSCILLATOR
INPUT
OSCILLATOR
+124
BLACKPLANE
DRIVER
ENABLE
7 WIDE LATCH
7 WIDE LATCH
1/2 DIGIT
LATCH
DECODER
Q
÷2
CL
R
CL
÷5
Q
R
DECODER
LEADING
ZERO
BLANKING
VDD INPUT
Q
÷2
CL
R
CL
÷5
Q
R
D 1/2 Q
CLDIGIT
R
CARRY
OUTPUT
BP INPUT/OUTPUT
ENABLE
DETECTOR
2



Intersil Electronic Components Datasheet

ICM7224 Datasheet

41/2 Digit LCD Display Counter

No Preview Available !

ICM7224 pdf
ICM7224
Absolute Maximum Ratings
Supply Voltage (VDD - VSS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.5V
Input Voltage (Any Terminal) (Note 1) . . . (VDD + 0.3V) to (VSS - 0.3V)
Operating Conditions
Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . -25oC to 85oC
Thermal Information
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 the CMOS process, connecting any terminal to voltages greater than VDD or less than VSS may
cause destructive device latchup. For this reason, it is recommended that no inputs from sources operating on a different power supply
be applied to the device before its supply is established, and that in multiple supply systems, the supply to the ICM7224 be turned on first.
2. θJA is measured with the component mounted on an evaluation PC board in free air.
Electrical Specifications VDD = 5V, VSS = 0V, TA = 25oC, Unless Otherwise Indicated
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Operating Current, IDD
Test Circuit, Display Blank
- 10 50 µA
Operating Supply Voltage Range
(VDD - VSS), VSUPPLY
3 - 6V
OSClLLATOR Input Current, IOSCI
Pin 36
- ±2 ±10 µA
Segment Rise/Fall Time, tr, tf
CLOAD = 200pF
- 0.5 -
µs
BackPlane Rise/Fall Time, tr, tf
CLOAD = 5000pF
- 1.5 -
µs
Oscillator Frequency, fOSC
Pin 36 Floating
- 19 - kHz
Backplane Frequency, fBP
Pin 36 Floating
- 150 -
Hz
Input Pullup Currents, IP
Pins 29, 31, 33, 34, VIN = VDD - 3V
-
10
-
µA
Input High Voltage, VIH
Pins 29, 31, 33, 34
3- -V
Input Low Voltage, VIL
Pins 29, 31, 33, 34
- - 1V
COUNT Input Threshold, VCT
-2-V
COUNT Input Hysteresis, VCH
- 0.5 -
V
Output High Current, IOH
CARRY Pin 28
Leading Zero Blanking OUT Pin 30
VOUT = VDD - 3V
-350
-500
-
µA
Output Low Current, IOL
CARRY Pin 28
Leading Zero Blanking OUT Pin 30
VOUT = +3V
350
500
-
µA
Count Frequency, fCOUNT
4.5V < VDD < 6V
0 - 15 MHz
STORE, RESET Minimum Pulse Width, tS, tr
3 - - µs
Timing Waveforms
OSCILLATOR
FREQUENCY
BACKPLANE
INPUT/OUTPUT
OFF SEGMENTS
128 CYCLES
64 CYCLES
64 CYCLES
ON SEGMENTS
FIGURE 1. ICM7224 DISPLAY WAVEFORMS
3




Part Number ICM7224
Description 41/2 Digit LCD Display Counter
Maker Intersil Corporation
Total Page 7 Pages
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