ICM7245_14 Datasheet, PDF (12/13 Pages) Intersil Corporation – 8-Character, 16-Segment, Microprocessor Compatible,LED Display Decoder Driver

ICM7245
in which all outputs are effectively open circuits, except for
parasitic diodes to the supply lines. Thus a display connected to
the output may be driven by another circuit (including another
ICM7245) without driver conflicts.
Display Output
The output of the Multiplex Counter is decoded and multiplexed
into the address input of the Data Memory, except during WR
operations (in Sequential Access mode, with SEN high and
DISPlay FULL low), when it scans through the display data. The
address decoder also drives the CHARacter outputs, except
during the inter-character blanking interval (nominally about
5µs). Each CHARacter output lasts nominally about 300µs, and
is repeated nominally every 2.5ms, i.e., at a 400Hz rate (times
are based on internal oscillator without external capacitor).
The 6 bits read from the Data Memory are decoded in the ROM
to the 17 segment signals, which drive the SEGment outputs.
Both CHARacter and SEGment outputs are disabled during WR
operations (with SEN high and DISPlay FULL Low for Sequential
Access mode). The outputs may also be disabled by pulling
OSC/OFF low.
The decode pattern from 6 bits to 17 segments is done by a ROM
pattern according to the ASCll font shown. Custom decode
patterns can be arranged, within these limitations, by contacting
Intersil sales support.
Revision History
The revision history provided is for informational purposes only and is believed to be accurate, but not warranted. Please go to the web
to make sure that you have the latest revision.
DATE
REVISION
CHANGE
October 29, 2013 FN8587.0 Initial Release
About Intersil
Intersil Corporation is a leader in the design and manufacture of high-performance analog, mixed-signal and power management
semiconductors. The company's products address some of the largest markets within the industrial and infrastructure, personal
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For the most updated datasheet, application notes, related documentation and related parts, please see the respective product
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in the quality certifications found at www.intersil.com/en/support/qualandreliability.html
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12
FN8587.0
October 29, 2013