IC in high impedance state ??

W

wingbar

New Member

• Mar 15, 2004

• #1

Hi,
I would like to know what does it mean when an IC is in high impedance state ?
For example, for IC 74LS244, when pin 1 and 19 is high, then the output is a high impedance state.

 

Sebi

Active Member

• Mar 15, 2004

• #2

The high impedance state = no low, no high logic level, the output "disconnected".

 

L

liupengjian

New Member

• Apr 1, 2004

• #3

If you use a logic prob to test the high impedence pin,the led will blink, if you use a oscillator scope to test it, the voltage leve should be a little higher than 0, but much lower than Vcc.