EL2019 pdf datasheet (Fast, Hi

The EL2019 offers a new feature
previously unavailable in a comparator
before—a master/slave edge triggered
flip-flop. The comparator output will only change output state
after a positive going clock edge is applied. Thus the output
can't feed back to the input and cause oscillation.
Manufactured with Elantec's proprietary Complementary
Bipolar process, this device uses fast PNP and NPN
transistors in the signal path. A unique circuit design gives
the inputs the ability to handle large common mode and
differential mode signals, yet retain high speed and excellent
accuracy. Careful design of the front end insures speed and
accuracy when operating with a mix of small and large
signals. The three-state output stage is designed to be TTL
compatible for any power supply combination, yet it draws a
constant current and does not generate current glitches.
When the output is disabled, the supply current consumption
drops by 50%, but the input stage and master slave flip-flop
remain active.