MC74ACT259 Motorola, MC74ACT259 Datasheet

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MC74ACT259

Manufacturer Part Number
MC74ACT259
Description
8-BIT ADDRESSABLE LATCH
Manufacturer
Motorola
Datasheet

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Part Number:
MC74ACT259D
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ON/安森美
Quantity:
20 000
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8 Bit Addressable Latch
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.
FUNCTIONAL DESCRIPTION
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 non-
addressed 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.
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.
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
V CC
The MC74AC259/74ACT259 is a high-speed 8-bit addressable latch designed for
The MC74AC259/74ACT259 has four modes of operation as shown in the Mode
In the one-of-eight decoding or demultiplexing mode, the addressed output will
16
A 0
1
MR
15
A 1
2
14
A 2
E
3
Q 0
13
D
4
Q 7
Q 1
12
5
Q 6
Q 2
11
6
Q 5
Q 3
10
7
GND
Q 4
9
8
FACT DATA
5-1
MC74ACT259
A 0
A 1
A 2
MC74AC259
MR Q 0 Q 1 Q 2 Q 3 Q 4 Q 5 Q 6 Q 7
ADDRESSABLE
LOGIC SYMBOL
CASE 751B-05
CASE 648-08
N SUFFIX
D SUFFIX
PLASTIC
PLASTIC
LATCH
8-BIT
E
D
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MC74ACT259 Summary of contents

Page 1

... www.DataSheet4U.com GND FACT DATA 5-1 MC74AC259 MC74ACT259 8-BIT ADDRESSABLE LATCH N SUFFIX CASE 648-08 PLASTIC D SUFFIX CASE 751B-05 PLASTIC LOGIC SYMBOL ...

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... MC74AC259 MC74ACT259 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 MODE SELECT-FUNCTION TABLE Inputs Operating Operating Mode Mode Master Reset ...

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... MC74AC259 MC74ACT259 Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays. FACT DATA 5 ...

Page 4

... MC74AC259 MC74ACT259 MAXIMUM RATINGS* Symbol Supply Voltage (Referenced to GND Input Voltage (Referenced to GND) V out DC Output Voltage (Referenced to GND Input Current, per Pin I out DC Output Sink/Source Current, per Pin GND Current per Output Pin T stg Storage Temperature * Maximum Ratings are those values beyond which damage to the device may occur ...

Page 5

... MC74AC259 MC74ACT259 DC CHARACTERISTICS Symbol Symbol Parameter Parameter V IH Minimum High Level Input Voltage Input Voltage V IL Maximum Low Level Input Voltage Input Voltage V OH Minimum High Level Output Voltage Output Voltage V OL Maximum Low Level Output Voltage Output Voltage I IN Maximum Input ...

Page 6

... MC74AC259 MC74ACT259 AC CHARACTERISTICS (For Figures and Waveforms — See Section 3) Symbol Symbol Parameter Parameter Propagation Delay t PLH t PLH Propagation Delay t PHL t PHL Propagation Delay t PLH t PLH Propagation Delay t PHL t PHL Propagation Delay t PLH ...

Page 7

... MC74AC259 MC74ACT259 DC CHARACTERISTICS Symbol Symbol Parameter Parameter V IH Minimum High Level Input Voltage Input Voltage V IL Maximum Low Level Input Voltage Input Voltage V OH Minimum High Level Output Voltage Output Voltage V OL Maximum Low Level Output Voltage Output Voltage I IN Maximum Input ...

Page 8

... MC74AC259 MC74ACT259 AC CHARACTERISTICS (For Figures and Waveforms — See Section 3) Symbol Symbol Parameter Parameter Propagation Delay t PLH t PLH Propagation Delay t PHL t PHL Propagation Delay t PLH t PLH Propagation Delay ...

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... MC74AC259 MC74ACT259 –A– 0.25 (0.010) –A– –T– SEATING PLANE 0.25 (0.010 Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. “ ...

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... This datasheet has been download from: www.datasheetcatalog.com Datasheets for electronics components. ...

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