jomelavenido
- Joined Jun 10, 2013
- 13
i understand what you meant but i can even produced 20mA high output current using a very simple computation.. its all on the voltage output high even disregarding the -0.4mA..
For example, if the voltage output high is 3V and you have to drive a led which has a voltage drop of 2V and you want 20mA to flow through it you'll just have to add a resistor and then apply the ohms law to determine the resistane that will allow 20mA to flow (assuming from output pin to led and resistor in series to ground).. R=[(VOH - Vled)/20mA] = 50 ohms.. and that's it.. a 20mA flowing through your circuit in series..
but what im really trying to ask is can LS TTL drive a LED.. but in real life and in practice it can..
and its not a coincidence for absf... its possible..
For example, if the voltage output high is 3V and you have to drive a led which has a voltage drop of 2V and you want 20mA to flow through it you'll just have to add a resistor and then apply the ohms law to determine the resistane that will allow 20mA to flow (assuming from output pin to led and resistor in series to ground).. R=[(VOH - Vled)/20mA] = 50 ohms.. and that's it.. a 20mA flowing through your circuit in series..
but what im really trying to ask is can LS TTL drive a LED.. but in real life and in practice it can..
and its not a coincidence for absf... its possible..