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HD74AC259

Hitachi Semiconductor
Part Number HD74AC259
Manufacturer Hitachi Semiconductor
Description 8-bit Addressable Latch
Published Mar 23, 2005
Detailed Description HD74AC259 8-bit Addressable Latch Description The HD74AC259 is a high-speed 8-bit addressable latch designed for genera...
Datasheet PDF File HD74AC259 PDF File

HD74AC259
HD74AC259

Overview
HD74AC259 8-bit Addressable Latch Description The HD74AC259 is a high-speed 8-bit addressable latch designed for general purpose storage applications in digital systems.
It is a multifunctional device capable or 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.
Features • • • • • • • 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 Outputs Source/Sink 24 mA HD74AC259 Pin Arrangement A0 1 A1 2 A2 3 Q0 4 Q1 5 Q2 6 Q3 7 GND 8 (Top view) 16 VCC 15 MR 14 E 13 D 12 Q7 11 Q6 10 Q5 9 Q4 Logic Symbol E A0 A1 A2 D MR Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7 Pin Names A0 – A2 D E MR Q0 – Q7 Address Inputs Data Inputs Enable Input (Active LOW) Master Reset (Active LOW) Latch Outputs 2 HD74AC259 Logic Diagram Q7 Q6 Q5 MR Q4 A2 A1 Q3 A0 Q2 Q1 D E Q0 3 HD74AC259 Function Table Inputs Operating Mode Master reset Demultiplex (Active HIGH Decoder when D = H) MR E L L L L L L L L L Store (Do nothing) Addressable latch H H H H H H H H H H L X d q : : : : : H L L L L L L L L H L L L L L L L L D X d d d d d d d d X d d d d d d d d A0 X L H L H L H L H X L H L H L H L H A1 X L L H H L L H H X L L H H L L H H A2 X L L L L H H H H X L L L L H H H H Outputs Q0 L Q1 L Q2 L L Q3 L L L Q4 L L L L Q5 L L L L L Q6 L L L L L L Q7 L L L L L L L Q=d L L L L L L L L q0 Q=d L L L L L L L q1 Q=d L L L L L L q2 q2 Q=d L L L L L q3 q3 q3 Q=d L L L L q4 q4 q4 q4 Q=d L L L q5 q5 q5 q5 q5 Q=d L L q6 q6 q6 q6 q6 q6 Q=d q7 q7 q7 q7 q7 q7 q7 Q = d q1 q0 q0 q0 q0 q0 q0 q0 Q = d q2 q1 q1 q1 q1 q1 q1 Q = d q3 q2 q2 q2 q2 q2 Q = d q4 q3 q3 q3 q3 Q = d q5 q4 q4 q4 Q = d q6 q5 q5 Q = d q7 q6 Q=d High Voltage Level Low Voltage Level Immaterial High or Low data...


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