MC74AC259 Datasheet, PDF (1/11 Pages) ON Semiconductor – 8−Bit Addressable Latch

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
• Pb−Free Packages are Available
V_CC MR E
D Q₇ Q₆ Q₅ Q₄
16 15 14 13 12 11 10 9
12345678
A₀ A₁ A₂ Q₀ Q₁ Q₂ Q₃ GND
Figure 1. Pinout: 16−Lead Packages Conductors
(Top View)
http://onsemi.com
16
1
16
1
16
1
PDIP−16
N SUFFIX
CASE 648
SOIC−16
D SUFFIX
CASE 751B
SOEIAJ−16
M, MEL SUFFIX
CASE 966
DEVICE MARKING INFORMATION
See general marking information in the device marking
section on page 9 of this data sheet.
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 9 of this data sheet.
A₀
E
D
A₁
A_{2 MR Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7}
Figure 2. Logic Symbol
MODE SELECT TABLE
E MR
Mode
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, 2005
1
November, 2005 − Rev. 6
Publication Order Number:
MC74AC259/D