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Intersil Electronic Components Datasheet



ICM7224

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



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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



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