EL4421C 22C 41C 42C 43C 44C
Multiplexed-Input Video Amplifiers
Applications Information
Switching Characteristics
The logic inputs work with standard TTL levels
of 0 8V or less for a logic 0 and 2 0V or more for a
logic 1 making them compatible for TTL and
Contd
CMOS drivers The ground pin is the logic
threshold biasing reference The simplified input
circuitry is shown below
4421 – 35
Figure 1 Simplified Logic Input Circuitry
The ground pin draws a maximum DC current of
6
mA
and may be biased anywhere between
(V
b
)
a
2 5V and (V
a
)
b
3 5V The logic inputs
may range from (V
b
)
a
2 5V to V
a
and are ad-
ditionally required to be no more negative than
V(Gnd pin)
b
4V and no more positive than
V(Gnd pin)
a
6V
For example within these constraints we can
power the EL44XX’s from
a
5V and
a
12V with-
out a negative supply by using these connections
4421 – 36
Figure 2 Using the EL44XX Mux Amps with
a
5V and
a
12V Supplies
10
ELANTEC [ ELANTEC SEMICONDUCTOR ]
