Philips Semiconductors
Product specification
Hex inverter
74HCU04
Fig.10 Test set-up for measuring forward
transconductance g
fs
= di
o
/dv
i
at v
o
is constant
(see also graph Fig.11).
Fig.11 Typical forward transconductance g
fs
as a
function of the supply voltage V
CC
at
T
amb
= 25°C.
APPLICATION INFORMATION
Some applications for the “HCU04” are:
•
Linear amplifier (see Fig.12)
•
In crystal oscillator designs (see Fig.13)
•
Astable multivibrator (see Fig.14)
Z
L
>
10 kΩ; A
OL
= 20 (typ.)
A
OL
A
u
= –
--------------------------------------------
-;
R1
1
+
-------
(
1
+
A
OL
)
-
R2
V
O max (p-p)
≈
V
CC
−2
V centered at
1
⁄
2
V
CC
3 kΩ
≤
R1, R2
≤
1 MΩ
Typical unity gain bandwidth product is 5 MHz.
C
I
(see Fig.15)
A
OL
= open loop amplification
A
u
= voltage amplification
Fig.12 HCU04 used as a linear amplifier.
September 1993
6
PHILIPS [ NXP SEMICONDUCTORS ]
