HD74HC589 Datasheet, PDF (1/10 Pages) Hitachi Semiconductor – 8-bit Serial of Parallel-input/Serial-output Shift Register(with 3-state outputs)

HD74HC589
8-bit Serial of Parallel-input/Serial-output Shift Register
(with 3-state outputs)
Description
The HD74HC589 is similar in function to the HD74HC597, which is not a 3-state device.
This device consists of an 8-bit storage latch which feeds parallel data to an 8-bit shift register. Data can
also be loaded serially (see Function Table). The shift register output, O_H, is a three-state output, allowing
this device to be used in bus-oriented systems.
Features
• High Speed Operation: t_pd (Shift Clock to Q_H) = 15 ns typ (C_L = 50 pF)
• High Output Current: Fanout of 15 LSTTL Loads
• Wide Operating Voltage: V_CC = 2 to 6 V
• Low Input Current: 1 µA max
• Low Quiescent Supply Current: I_CC (static) = 4 µA max (Ta = 25°C)
Function Table
Latch Clock
LCK
Shift Clock
SCK
X
X
X
X
L, H,
X
L, H,
Serial Shift/
Parallel Load
X
L
L
X
H
Output Enable Function
OE
X
Data are loaded into input latches
L
Data are loaded from input into shift
registers
L
Data are transfered from input
latches to shift registers
H
Outputs are disabled
L
Serial shift Q_n = Q_{n – 1}, Q₀ = SER