dm74ls259 National Semiconductor Corporation, dm74ls259 Datasheet

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dm74ls259

Manufacturer Part Number
dm74ls259
Description
8-bit Addressable Latches
Manufacturer
National Semiconductor Corporation
Datasheet

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Part Number
Manufacturer
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Part Number:
dm74ls259MX
Manufacturer:
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Part Number:
dm74ls259N
Manufacturer:
FAIRCHILD/仙童
Quantity:
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C 1995 National Semiconductor Corporation
DM54LS259 DM74LS259 8-Bit Addressable Latches
General Description
These 8-bit addressable latches are designed for general
purpose storage applications in digital systems Specific
uses include working registers serial-holding registers and
active-high decoders or demultiplexers They are multifunc-
tional devices capable of storing single-line data in eight
addressable latches and being a 1-of-8 decoder or demulti-
plexer with active-high outputs
Four distinct modes of operation are selectable by control-
ling the clear and enable inputs as enumerated in the func-
tion table In the addressable-latch mode data at the data-
in terminal is written into the addressed latch The ad-
dressed latch will follow the data input with all unaddressed
latches remaining in their previous states In the memory
mode all latches remain in their previous states and are
unaffected by the data or address inputs To eliminate the
possibility of entering erroneous data in the latches the en-
able should be held high (inactive) while the address lines
are changing In the 1-of-8 decoding or demultiplexing
mode the addressed output will follow the level of the D
input with all other outputs low In the clear mode all out-
puts are low and unaffected by the address and data inputs
Connection Diagram
Order Number DM54LS259E DM54LS259J
See NS Package Number E20A J16A
DM74LS259WM or DM74LS259N
DM54LS259W DM74LS259M
M16A M16B N16E or W16A
Dual-In-Line Package
TL F 6418
TL F 6418 – 1
Features
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Function Table
H
D
Q
Steady-State Input Conditions Were Established
Clear
i0
e
e
8-Bit parallel-out storage register performs serial-to-par-
allel conversion with storage
Asynchronous parallel clear
Active high decoder
Enable disable input simplifies expansion
Direct replacement for Fairchild 9334
Expandable for N-bit applications
Four distinct functional modes
Typical propagation delay times
Fan-out
Typical I
Inputs
H
H
e
L
L
C
H
H
H
H
L
L
L
L
High Level L
the Level of the Data Input
Enable-to-output 18 ns
Data-to-output 16 ns
Address-to-output 21 ns
Clear-to-output 17 ns
I
I
OL
OH
the Level of Q
54LS259 4 mA
74LS259 8 mA
Select Inputs
(sink current)
(source current)
H
H
E
L
L
CC
Latch Selection Table
Addressed
B
H
H
H
H
L
L
L
L
Output of
22 mA
e
Latch
i
Low Level
Q
(i
D
D
L
e
i0
0 1
A
H
H
H
H
L
L
L
L
b
Output
0 4 mA
Other
7 as Appropriate) before the Indicated
Each
Q
Q
L
L
i0
i0
Addressed
Latch
0
1
2
3
4
5
6
7
Addressable Latch
Memory
8-Line Demultiplexer
Clear
RRD-B30M105 Printed in U S A
Function
May 1992

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dm74ls259 Summary of contents

Page 1

... DM54LS259 DM74LS259 8-Bit Addressable Latches General Description These 8-bit addressable latches are designed for general purpose storage applications in digital systems Specific uses include working registers serial-holding registers and active-high decoders or demultiplexers They are multifunc- tional devices capable of storing single-line data in eight ...

Page 2

... I Max Max Max DM54 DM74 20 b Max (Note for rising edge for falling edge 2 DM74LS259 Units Min Nom Max ...

Page 3

Switching Characteristics Symbol Parameter t Propagation Delay Time PLH Low to High Level Output t Propagation Delay Time PHL High to Low Level Output t Propagation Delay Time PLH Low to High Level Output t Propagation Delay Time PHL High ...

Page 4

... Physical Dimensions inches (millimeters) (Continued) 16-Lead Ceramic Dual-In-Line Package (J) 16-Lead Molded Package Small Outline (SO) Order Number DM54LS259J NS Package Number J16A Order Number DM74LS259M NS Package Number M16A 4 ...

Page 5

... Physical Dimensions inches (millimeters) (Continued) 16-Lead Wide Small Outline Molded Package (M) 16-Lead Molded Dual-In-Line Package (N) Order Number DM74LS259WM NS Package Number M16B Order Number DM74LS259N NS Package Number N16E 5 ...

Page 6

Physical Dimensions inches (millimeters) (Continued) 16-Lead Ceramic Flat Package (W) LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMICONDUCTOR ...

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