lCM7217BlJl Intersil Corporation, lCM7217BlJl Datasheet

lCM7217BlJl

Manufacturer Part Number

lCM7217BlJl

Description

4-digit Led Display, Programmable Up/down Counter

Manufacturer

Intersil Corporation

Datasheet

1.LCM7217BLJL.pdf (20 pages)

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July 2001

1-888-INTERSIL or 321-724-7143

Features

• Four Decade, Presettable Up-Down Counter with

• Settable Register with Contents Continuously

• Directly Drives Multiplexed 7 Segment Common

• On-Board Multiplex Scan Oscillator

• Schmitt Trigger On Count Input

• TTL Compatible BCD I/O Port, Carry/Borrow, Equal,

• Display Blank Control for Lower Power Operation;

• All Terminals Fully Protected Against Static Discharge

• Single 5V Supply Operation

Part Number Information

ICM7217AIPI

ICM7217CIPl

ICM7217IJI

lCM7217BlJl

Parallel Zero Detect

Compared to Counter

Anode or Common Cathode LED Displays

and Zero Outputs

Quiescent Power Dissipation <5mW

NUMBER

PART

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

Intersil and Design is a trademark of Intersil Americas Inc.

TEMP. RANGE

-25 to 85

(

28 Ld PDIP

28 Ld CERDIP

PACKAGE

Description

The ICM7217 is a four digit, presettable up/down counter with

an onboard presettable register continuously compared to the

counter. The ICM7217 is intended for use in hard-wired

applications where thumbwheel switches are used for loading

data, and simple SPDT switches are used for chip control.

This circuit provides multiplexed 7 segment LED display

outputs, with common

configurations available. Digit and segment drivers are

provided to directly drive displays of up to 0.8 inch

character height (common anode) at a 25% duty cycle. The

frequency of the onboard multiplex oscillator may be

controlled with a single capacitor, or the oscillator may be

allowed to free run. Leading zeros can be blanked. The

data appearing at the 7 segment and BCD outputs is

latched; the content of the counter is transferred into the

latches under external control by means of the Store pin.

The ICM7217 (common anode) and ICM7217A (common

cathode) versions are decade counters, providing a

maximum count of 9999, while the ICM7217B (common

anode) and ICM7217C (common cathode) are intended for

timing purposes, providing a maximum count of 5959.

This circuit provides 3 main outputs; a CARRY/BORROW

output, which allows for direct cascading of counters, a

ZERO output, which indicates when the count is zero, and

an EQUAL output, which indicates when the count is equal

to the value contained in the register. Data is multiplexed to

and from the device by means of a three-state BCD I/O port.

The CARRY/BORROW, EQUAL, ZERO outputs, and the

BCD port will each drive one standard TTL load.

To permit operation in noisy environments and to prevent

multiple triggering with slowly changing inputs, the count

input is provided with a Schmitt trigger.

Input frequency is guaranteed to 2MHz, although the device will

typically run with f

(EQUAL output) will typically run 750kHz maximum.

Common Cathode

Common Anode

DISPLAY DRIVER

Programmable Up/Down Counter

TYPE

as high as 5MHz. Counting and comparing

ICM7217

COUNT OPTION/

anode or common cathode

MAX COUNT

Decade/9999

4-Digit LED Display,

Timing/5959

File Number

E28.6

F28.6

PKG. NO.

3167.3

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