<s>
High-threshold	B-General_Concept
logic	I-General_Concept
(	O
HTL	O
)	O
,	O
also	O
known	O
as	O
low-speed	B-General_Concept
logic	I-General_Concept
(	O
LSL	O
)	O
or	O
high-level	O
logic	O
(	O
HLL	O
)	O
,	O
is	O
a	O
variant	O
of	O
diode	B-General_Concept
–	I-General_Concept
transistor	I-General_Concept
logic	I-General_Concept
used	O
in	O
environments	O
where	O
noise	O
is	O
very	O
high	O
.	O
</s>
<s>
The	O
principle	O
of	O
improving	O
charge	O
–	O
discharge	O
parasitic	O
capacitances	O
used	O
here	O
is	O
the	O
same	O
as	O
in	O
high-threshold	B-General_Concept
logic	I-General_Concept
circuits	O
.	O
</s>
