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MC74ACT259

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 ClearThe MC74AC259/74ACT259 has four modes of operat...

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MC74ACT259: Features: • Serial-to-Parallel Conversion• Eight Bits of Storage with Output of Each Bit Available• Random (Addressable) Data Entry• Active High Demultiplexing or Decoding Ca...

MC74ACT259 Data Sheet

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Part Number:
MC74ACT259
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5000

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Product Details

Description



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

The MC74AC259/74ACT259 has four modes of operation as shown in the Mode Selection Table. In the addressable latch mode, data on the Data line (D) is written into the addressed latch. The addressed latch will follow the data input with all nonaddressed latches remaining in their previous states in the memory mode. All latches remain in their previous state and are unaffected by the Data or Address inputs.

In the one-of-eight decoding or demultiplexing mode, the addressed output will follow the state of the D input with all other outputs in the LOW state. In the clear mode all outputs are LOW and unaffected by the address and data inputs. When operating the MC74AC/ACT259 as an addressable latch, changing more than one bit of the address could impose a transient wrong address. Therefore, this should only be done while in the memory mode. The Mode Select Function Table summarizes the operations of the MC74AC/ACT259.


Pinout

Connection Diagram


Specifications

Symbol
Parameter
Value
Unit
VCC
 DC Supply Voltage (Referenced to GND)
0.5 to +7.0
V
Vin
 DC Input Voltage (Referenced to GND)
0.5 to VCC +0.5
V
Vout
 DC Output Voltage (Referenced to GND)
0.5 to VCC +0.5
V
Iin
 DC Input Current, per Pin
±20
mA
Iout
 DC Output Sink/Source Current, per Pin
±50
mA
ICC
 DC VCC or GND Current per Output Pin
±50
mA
Tstg
 Storage Temperature
65 to +150
* Maximum Ratings are those values beyond which damage to the device may occur. Functional operation
   should be restricted to the Recommended Operating Conditions.


Description

The MC74AC259/74ACT259 is a high-speed 8-bit addressable latch designed for general purpose storage applications in digital systems. MC74ACT259 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.




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