ICM7224
®
NO R
UCT
PR O D
ENT
OLETE REPL ACEM
OBS
ED
MEND
EC O M
4 1/2 Digit LCD Display Counter
May 2001
Features
Description
• High Frequency Counting - Guaranteed 15MHz, Typically
25MHz at 5V
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.
• Low Power Operation - Typically Less Than 100µW
Quiescent
The counter section provides direct static counting, guaranteed from DC to 15MHz, using a 5V ±10% supply over the
operating temperature range. At normal ambient temperatures, 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.
• 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
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.
• 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
These devices provide maximum count of 19999. The
display drivers are not of the multiplexed type and each display segment has its own individual drive pin, providing high
quality display outputs.
ICM7224
(PDIP)
TOP VIEW
VDD
1
2
39 C1
G1
3
Part Number Information
40 D1
E1
38 B1
F1
4
37 A1
BP
5
36 OSCILLATOR
A2
6
7
8
33 RESET
D2
9
32 COUNT
E2
10
31 COUNT INHIBIT
G2
11
PKG.
NO.
PACKAGE
34 STORE
C2
TEMP.
RANGE ( oC)
35 VSS
B2
PART NUMBER
30 LZB OUT
F2
12
13
14
15
26 F4
D3
16
25 G4
E3
17
24 E4
G3
18
23 D4
F3
19
22 C4
A4
20
E40.6
27 1/2 - DIGIT
C3
40 Ld PDIP
28 CARRY
B3
-25 to 85
29 LZB IN
A3
ICM7224IPL
21 B4
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
