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Part Number: CD74HC190
For the CD74HC190, I do not plan to control LOAD with any form of MCU or switch, and would prefer to just tie it to either VCC or GND, but I would like to to load the initial value on the ABCD Data Inputs (hardwired) at power-up. Can this be done, or do I need to trigger the load after the IC has been turned on? My best guess right now is to tie LOAD to VCC when powering up.
Mitch M, TI Sensing Products Applications Support
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You can use the same circuit described in this video to do a 'load' at system startup:
The only caveat is that your 'power on' needs to be relatively fast, and not a slow ramp -- or your RC values might have to be too large to be viable.
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In reply to Emrys Maier:
In reply to Mitch M:
There's an FAQ on this topic here:
Short version - this is a latched device (it uses flip-flops for the counter), so the outputs are unknown at startup. All counters will have some kind of reset or load pin because of this.
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