September 1983
Revised February 1999
MM74HC589 8-Bit Shift Registers with Input Latches and 3-STATE Serial Output
© 1999 Fairchild Semiconductor Corporation DS005368.prf www.fairchildsemi.com
MM74HC589
8-Bit Shift Registers with Input Latches and 3-STATE
Serial Output
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-p in pa ckag e an d con s ists
of an 8-bit storage latch feeding a parall el-in, serial-out 8bit shift register. Data can also be entered seriall y 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 enabl e th e wi re -ORi n g o f mu l tiple
devices on a serial bus.
The 74HC logic family is speed, function, an d p in-o ut co mpatible with the sta ndard 74LS logic fami ly. All inputs are
protected from damage due to static discharge by inte rnal
diode clamps to V
CC
and ground.
Features
■ 8-bit parallel storag e register inputs
■ Wide operating voltage range: 2V–6V
■ Shift register has direct overriding load
■ Guaranteed shift frequency. . . DC to 30 MHz
■ Low quiescent current: 80 µA maximum (74HC Series)
■ 3-STATE output for ‘Wire-OR'
Ordering Code:
Devices also availab le in Tape and Reel. Specify by appending th e s uffix let t er “X” to the ordering cod e.
Connection Diagram
Pin Assignments f or DIP, SOIC, SOP and TSSOP
Top View
Truth Table
Order Number Package Number Package Description
MM74HC589M M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150” Narrow
MM74HC589SJ M16D 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
MM74HC589MTC MTC16 16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
MM74HC589N N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide
RCK SCK SLOAD OE Function
XX XHQ
H
in Hi-Z State
XX XLQ
H
is enabled
↑ X X X Data loaded into input latches
↑ X L X Data loaded into shift register
from pins
H or L X L X Data loaded from latches to
shift register
X ↑ H X Shift register is shifted. Data
on SER pin is shifted in.
↑↑ H X Data is shifted in shift register,
and data is loaded into latches