HIT HD74HC589 Datasheet

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, OH, is a three-state output, allowing
this device to be used in bus-oriented systems.

Features

• High Speed Operation: tpd (Shift Clock to QH) = 15 ns typ (CL = 50 pF)

• High Output Current: Fanout of 15 LSTTL Loads

• Wide Operating Voltage: VCC = 2 to 6 V

• Low Input Current: 1 µA max

• Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C)

Function Table

Latch Clock
LCK

X X L L Data are transfered from input

L, H, L, H, X H Outputs are disabled
X H L Serial shift Qn = Q

Shift Clock
SCK

X X X Data are loaded into input latches
X L L Data are loaded from input into shift

Serial Shift/
Parallel Load

Output EnableOEFunction

registers

latches to shift registers

, Q0 = SER

n – 1

HD74HC589

Pin Arrangement

1

BV

2

C

D

3

E

4

F

5

G

6

7

H

GND

89

16

CC

A

15

14

A

S
Serial Shift/

13

Parallel Load

12

Latch Clock

11

Shift Clock

10

Output Enable

H

Q

(Top view)

Absolute Maximum Ratings

Item Symbol Rating Unit

Supply voltage range V
Input voltage V
Output voltage V
Output current I
DC current drain per VCC, GND ICC, I
DC input diode current I
DC output diode current I
Power Dissipation per package P

CC

IN

OUT

OUT

GND

IK

OK

T

Storage temperature Tstg –65 to +150 °C

–0.5 to +7.0 V
–0.5 to VCC + 0.5 V
–0.5 to VCC + 0.5 V

±35 mA
±75 mA
±20 mA
±20 mA

500 mW

2

Logic Diagram

SCK

S

A

Shift/
Load

A

LCK

D

LCK

HD74HC589

SCK

D

SCK

SCK

S

Q

R

SCK

Q
Q

LCK

LCKDQ

B

C

D

E

F

G

H

LCK

LCK

Q

LCK

SCK

D

SCK

S

Q

R

VCC

OE

Q

H

3