ICM7226: Difference between revisions

Revision as of 07:03, 10 August 2024

The Intersil ICM7226 is an 8-decade counter and 7-segment driver monolithic integrated circuit.

The ICM7226 combines an oscillator, a decade timebase counter, an 8-decade data counter and latches, a 7-segment decoder, digit multiplexer and segment and digit drivers which can directly drive LED displays. It also has digit-serial BCD outputs.

It can function as a frequency counter, period counter, frequency ratio counter, time interval counter, or as a totalizing counter. The ICM7226 and the ICM7216 (which is similar but without BCD outputs) was used in numerous simple 1970s/1980s frequency counters, including DIY projects.

Key Specifications

Count frequency	Max. 10 MHz

There are two variants, ICM7226A for common anode displays (≤25 mA per segment), and ICM7226B for common cathode displays (≤12 mA per segment). They have different pin-out.

Some instruments using part ICM7226

Instrument	Manufacturer	Class	Model	Description	Introduced
DC5004	Tektronix	Plug-in	DC5004	frequency counter	1989
DC504A	Tektronix	Plug-in	DC504A	100 MHz, 6-digit frequency counter	1984

Data

Photos

ICM7226 basic circuit

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-The ICM7226 combines an oscillator, a decade timebase counter, an 8-decade data counter and latches, a 7-segment decoder, digit multiplexer and segment and digit drivers which can directly drive LED displays.
+The ICM7226 combines an oscillator, a decade timebase counter, an 8-decade data counter and latches, a 7-segment decoder, digit multiplexer and segment and digit drivers which can directly drive LED displays. It also has digit-serial BCD outputs.
-It can function as a frequency counter, period counter, frequency ratio counter, time interval counter, or as a totalizing counter. The ICM7226 (and the related was used in numerous simple 1970s/1980s frequency counters, including DIY projects.
+It can function as a frequency counter, period counter, frequency ratio counter, time interval counter, or as a totalizing counter. The ICM7226 and the ICM7216 (which is similar but without BCD outputs) was used in numerous simple 1970s/1980s frequency counters, including DIY projects.
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