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TTL And LVTTL Voltage Levels
The figure above shows the respective voltage levels of a TTLand a LVTTL signaling interfaces
using colored bars.
Driver output
At the
low logic level
, the driver guarantees an output voltage within the
bottom red window
.
●
The maximum driver output voltage, namely V
OL
is 0.4 V for both TTL and LVTTL.
●
The minimum driver output voltage is GND
At the
high logic level
, the driver output voltage is within the
upper red window
.
●
The minimum driver output voltage, namely V
OH
is 2.4 V for both TTL and LVTTL.
●
The maximum driver output voltage is VCC: 5 V for TTL and 3.3 V for LVTTL
Receiver input
The receiver guarantees to see a
low logic level
when the input signal voltage is within the
bottom red and dark gray windows
.
●
The maximum receiver input voltage, namely V
IL
is 0.8 V for both TTL and LVTTL.
●
The minimum receiver input voltage is GND
The receiver guarantees to see a
high logic level
when the input signal voltage is within the
upper red and dark gray windows
.
●
The minimum receiver input voltage, namely V
IH
is 2.0 V for both TTL and LVTTL.
eGrabber
Hardware Manual
