EL4421C/22C/41C/42C/43C/44C
Multiplexed-Input Video Amplifiers
Applications Information Ð Contd.
CMOS drivers. The ground pin is the logic
threshold biasing reference. The simplified input
circuitry is shown below:
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
4421–35
Figure 1. Simplified Logic Input Circuitry
b
The ground pin draws a maximum DC current of
6 mA, and may be biased anywhere between
V(Gnd pin) 4V and no more positive than
a
V(Gnd pin) 6V.
b
may range from (V
a
a
)
b
3.5V. The logic inputs
2.5V to V , and are ad-
(V
)
2.5V and (V
)
b a
a
ditionally required to be no more negative than
For example, within these constraints, we can
a
a
power the EL44XX’s from 5V and 12V with-
out a negative supply by using these connections:
4421–36
a
a
Figure 2. Using the EL44XX Mux Amps with 5V and 12V Supplies
10
ELANTEC [ ELANTEC SEMICONDUCTOR ]
