3V Low voltage RS Latch

Thread Starter

seacrab

Joined Sep 28, 2016
1
I am looking for a simple positive logic RS latch that runs around 3 volts since it will interface with an ISD 1820 voice module. It seems like most IC’s run from 5 to 18 volts and I don’t want two power sources. Kind of a newbie as far as finding things.
 

Ian0

Joined Aug 7, 2020
10,003
An SR latch can be made from two inverting gates. 74HC00 and 74HC02 will run from 3V and do the job.
There are lots of 74series families that work down to much lower voltages (1.8V for instance)
 

AnalogKid

Joined Aug 1, 2013
11,128
Here is a 555 Set-Reset flipflop with differing input logic polarities.

SW1 and SW2 can be combined into a single SPDT switch, either standard or momentary, with or without a center-off position.

ak

!!555-SR-FF-1-c.gif
 
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