Serial Input Alphanumeric Industrial Display

Sunlight Viewable: ISD235X

2006-04-04

1

ISD201X, ISD231X, ISD235X

ISD201X

ISD231X

ISD235X

RoHS Compliant - By ExemptionDESCRIPTION

The ISD201X/231X/235X are four digit 5 x 7 dot matrix serial input

alphanumeric displays. The displays are available in red, yellow,

high efficiency red, or high efficiency green. The package is a

standard twelve-pin hermetic DIP with glass lens. The display can

be stacked horizontally or vertically to form messages of any

length.

These displays have two fourteen-bit CMOS shift registers with

built-in row drivers. These shift registers drive twenty-eight rows

and enable the design of customized fonts. Cascading multiple

displays is possible because of the Data In and Data Out pins. Data

In and Out are easily input with the clock signal and displayed in

parallel on the row drivers. Data Out represents the output of the

7th bit of digit number four shift register. The shift register is level

triggered. The like columns of each character in a display cluster

are tied to a single pin (see Block Diagram). High true data in the

shift register enables the output current mirror driver stage

associated with each row of LEDs in the 5 x 7 diode array.

The TTL compatible V

display intensity or pulse width modulated to achieve intensity

control and reduce power consumption.

In the normal mode of operation, input data for digit four, column

one is loaded into the seven on-board shift register locations one

through seven. Column one data for digits 3, 2 and 1 is shifted into

the display shift register locations. Then column one input is

enabled for an appropriate period of time, T. A similar process is

repeated for columns 2, 3, 4 and 5. If the decode time and load data

time into the shift register is t, then with five columns, each column

of the display is operating at a duty factor of:

T+t, allotted to each display column, is generally chosen to provide

the maximum duty factor consistent with the minimum refresh rate

necessary to achieve a flicker free display. For most strobed

display systems, each column of the display should be refreshed

(turned on) at a minimum rate of 100 times per second.

With columns to be addressed, this refresh rate then gives a value

for the time T+t of: 1

⁄ [5 x (100)]=2.0 msec. If the device is operated

at 5.0 MHz clock rate maximum, it is possible to maintain t<T. For

short display strings, the duty factor will then approach 20%.

See Appnote 44 for application information and Appnotes 18, 19,

22, 23 at www.osram-os.com

DF

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FEATURES

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Four Dot Matrix Characters

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Character Height

ISD201X— 3.81 mm (0.150")

ISD231X— 5.08 mm (0.200")

ISD235X— 5.08 mm (0.200")

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Built-in CMOS Shift Registers with Constant Current

LED Row Drivers

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Wide Viewing Angle

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Shift Registers Allow Custom Fonts

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Easily Cascaded for Multiple Displays

•

TTL Compatible

•

End Stackable

•

Operating Temperature Range:

–55°C to +100°C

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Categorized for Luminous Intensity

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Ceramic Package, Hermetically Sealed Flat Glass

Window

RoHS Compliance

The ISD201X, ISD231X, ISD235X Intelligent Displays

metically sealed displays using a ceramic and glass construction.

These components are not lead (Pb) free but are RoHS Compliant

based on the RoHS Compliance Directive's Annex, paragraphs 5

and 7. These exemptions allow for lead (Pb) in glass and ceramic

electronic components. Refer to the following excerpts from the

RoHS Compliance Directive Annex:

Applications of lead, mercury, cadmium and hexavalent chromium,

which are exempted from the requirements of Article 4(1)

5. Lead in glass of cathode ray tubes, electronic components and

fluorescent tubes.

7. Lead in electronic ceramic parts (e.g. piezoelectronic devices). .