Electronics > Beginners
HY6264 SRAM - CS1/CS2?
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gmc:
Busy messing around with an Arduino and some of this old school ram.
On the truth table to read/write you put CS1 low and CS2 high.
To power down chip CS2 goes low.
Just curious why they didn't just use a single CS pin. Why the need for CS1 and CS2?
What am I missing?
https://datasheetspdf.com/datasheet/HY6264.html
capt bullshot:
--- Quote from: gmc on November 08, 2019, 09:28:38 am ---
Just curious why they didn't just use a single CS pin. Why the need for CS1 and CS2?
What am I missing?
--- End quote ---
You're missing nothing. There's no need for a second pin, they've just used a spare package pin to provide you with a second CS pin for your convenience. Sometimes this was used to easily power down and protect battery backed memory from accidental writes when the CPU powers up or down. Saved a gate back then.
gmc:
Thanks for the info. Thought it was odd.
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