ON Semiconductor MC74AC259 Manual

MC74AC259, MC74ACT259
8-Bit Addressable Latch
The MC74AC259/74ACT259 is a high−speed 8−bit addressable
latch designed for general purpose storage applications in digital
systems. It is a multifunctional device capable of storing single line
data in eight addressable latches, and also a 1−of−8 decoder and
demultiplexer with active HIGH outputs. The device also incorporates
an active LOW Common Clear for resetting all latches, as well as an
active LOW Enable. It is functionally identical to the ALS259 8−bit
addressable latch.
•
Serial−to−Parallel Conversion
•
Eight Bits of Storage with Output of Each Bit Available
•
Random (Addressable) Data Entry
•
Active High Demultiplexing or Decoding Capability
•
Easily Expandable
•
Common Clear
•
These are Pb−Free Devices
V MR E D
CC
16 15 14 13
1 2 3 4
A A A Q
0 1 2 0
Figure 1. Pinout: 16−Lead Packages Conductors
(Top View)
E
A
0
A
1
A
2
MR Q Q Q
0 1 2
Figure 2. Logic Symbol
MODE SELECT TABLE
E MR
L H Addressable Latch
H H Memory
L L Active HIGH 8−Channel Demultiplexer
H L Clear
H = HIGH Voltage Level
L = LOW Voltage Level
© Semiconductor Components Industries, LLC, 2015
March, 2015 − Rev. 7
Q Q Q Q
7 6 5 4
12 11 10 9
5 6 7 8
Q Q Q GND
1 2 3
D
Q Q Q Q Q
3 4 5 6 7
Mode
16
1
xxx
A
WL
Y
WW
G
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 8 of this data sheet.
1
www.onsemi.com
MARKING
DIAGRAM
16
SOIC−16
xxx259G
D SUFFIX
AWLYWW
CASE 751B
1
= AC or ACT
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
Publication Order Number:
MC74AC259/D