Hi!

4469 Line Driver - capable of driving highly capacitive,
inductive, or resistive loads with the ability to
source or sink up to 100ma current per output.

The line drivers are commonly used for encoder outputs.
The text below is from a manufacturer of encoders.

Luciano

* * *

5. Output IC’s
Output IC’s are available in either Line Driver (LD) or Open
Collector (OC) types. Open Collectors require pull-up resistors and
so have higher output impedance. In general it is recommended
to use a Line Driver style of output. They can either source or sink
current and their lower impedance mean better noise immunity
and faster switching times. Our applications specialists would be
pleased to discuss your system requirements and the compatibility
of your receiving electronics with Line Driver type outputs.


7272
Multi-voltage Line Driver: 100 mA source/sink. Input voltage 5 to
28 VDC standard (Note: Vout = Vin). Available with
voltage regulator for 5 to 28 VDC input/TTL output (called out as
a special feature). This driver is TTL compatible when used with 5
volt supply or with a voltage regulator option. Supply lines are
protected against overvoltage to 60 volts and reverse voltage.
Outputs are short circuit protected for one minute. Supply current
is 120 mA typical (plus load current). This is the recommended
replacement for 3904R and 7406R open collector outouts with
internal pullup resistors. This is also a direct replacement for any
4469, 88C30, 8830 or 26LS31 line driver


4469
Multi-voltage Line Driver: 100 mA source/sink. Input voltage 5
to 15 VDC standard (Note: Vout = Vin ). Available with voltage
regulator for 5 to 24 VDC input/5V output (called out as a special
feature). TTL compatible when used with 5 volt supply or with
voltage regulator. Supply lines are protected against overvoltage
to 60 volts and reverse voltage. Outputs are short circuit protected
for one minute. Supply current is 90 mA typical (plus load current).
This is the replacement for 3904R and 7406R outputs for systems
operating at 15 volts and below. This is also a direct replacement
for any 88C30, 8830, or 26LS31 Line Driver.
replaced by the 4469 or the 7272 in system upgrades, or with
the 7273 if external pull-ups are used.