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.