General Description
The MM74HC589 high speed shift register utilizes
advanced silicon-gate CMOS technology to achieve the
high noise immunity and low power consumption of standard
CMOS integrated circuits, as well as the ability to
drive 15 LS-TTL loads.
The MM74HC589 comes in a 16-pin package and consists
of an 8-bit storage latch feeding a parallel-in, serial-out 8-
bit shift register. Data can also be entered serially the shift
register through the SER pin. Both the storage register and
shift register have positive-edge triggered clocks, RCK and
SCK, respectively. SLOAD pin controls parallel LOAD or
serial shift operations for the shift register. The shift register
has a 3-STATE output to enable the wire-ORing of multiple
devices on a serial bus.
The 74HC logic family is speed, function, and pin-out compatible
with the standard 74LS logic family. All inputs are
protected from damage due to static discharge by internal
diode clamps to VCC and ground.