Produktbeskrivning
GENERAL DESCRIPTION
The HEF4894B is a 12 stage serial
shift register having a storage latch
associated with each stage for
strobing data from the serial input to
parallel LED driver outputs O0 to
O11. Data is shifted on positive-going
clock transitions. The data in each
shift register stage is transferred to
the storage register when the strobe
(STR) input is HIGH. Data in the
storage register appears at the
outputs whenever the output enable
(EO) signal is HIGH.
Two serial outputs (Os and Os') are
available for cascading a number of
HEF4894B devices. Data is available
at Os on positive-going clock edges to
allow high-speed operation in
cascaded systems in which the clock
rise time is fast. The same serial
information is available at Os' on the
next negative-going clock edge and
provides cascading HEF4894B
devices when the clock rise time is
slow.
The HEF4894B is a 12 stage serial
shift register having a storage latch
associated with each stage for
strobing data from the serial input to
parallel LED driver outputs O0 to
O11. Data is shifted on positive-going
clock transitions. The data in each
shift register stage is transferred to
the storage register when the strobe
(STR) input is HIGH. Data in the
storage register appears at the
outputs whenever the output enable
(EO) signal is HIGH.
Two serial outputs (Os and Os') are
available for cascading a number of
HEF4894B devices. Data is available
at Os on positive-going clock edges to
allow high-speed operation in
cascaded systems in which the clock
rise time is fast. The same serial
information is available at Os' on the
next negative-going clock edge and
provides cascading HEF4894B
devices when the clock rise time is
slow.