I looking for a 12.5 mm, 6 digit ( 7 segment) LCD or LED with 50 pins to be driven by a MM5453N. I understand that this is late 80s early 90s technology and woul like to know if anyone knows of a surplus house that has one or any individual that can sell me one.
73 Hank WD5JFR
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MM5453 is a N.S. 4 1/2 digit LCD driver
Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on
This is for a Lowe receiver made in th eUK. Lowe played some tricks and I'm still trying to figure out how they did it but the HF-225/235 can display frequencies up to 29.999Mhz and show limited status on the first digits using selected segments using a 5453. which can control 33 segments.
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I think I have it figured out. The Lowe HF-235 radio can tune up to X29.999MHz, where X is used as a status indicator and driven by an exclusive-or gate. For display of frequency the leading or most significant digit of the five can only be a one or a two. For a one bits 31 and 32 drive segments b and c. Segments a,d,e,g are tied together and bits 31 and
33 would make a 2. So if I'm using the correct terminology the 5453 is driving a 4 1/2 digit display that has 6 digits where X is driven by another chip and the next digit can only be a one or a two. So I need to find a 6 digit LCD with 50 pins that match. Any ideas appreciated. tnx
I think I have it figured out. The Lowe HF-235 radio can tune up to X29.999MHz, where X is used as a status indicator and driven by an exclusive-or gate. For display of frequency the leading or most significant digit of the five can only be a one or a two. For a one bits 31 and 32 drive segments b and c. Segments a,d,e,g are tied together and bits 31 and
33 would make a 2. So if I'm using the correct terminology the 5453 is driving a 4 1/2 digit display that has 6 digits where X is driven by another chip and the next digit can only be a one or a two. So I need to find a 6 digit LCD with 50 pins that match. Any ideas appreciated. tnx
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