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DM74LS259N

P1-P3P4-P6
© 2000 Fairchild Semiconductor Corporation DS006418 www.fairchildsemi.com
August 1986
Revised March 2000
DM74LS259 8-Bit Addressable Latches
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 mul-
tifunctional devices capable of storing single-line data in
eight addressable latches, and being a 1-of-8 decoder or
demultiplexer 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
addressed latch will follow the data input with all unad-
dressed 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 elimi-
nate the possibility of entering erroneous data in the
latches, the enable 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 outputs are LOW and unaffected by the address
and data inputs.
Features
■ 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 DM9334
■ Expandable for N-bit applications
■ Four distinct functional modes
■ Typical propagation delay times:
Enable-to-output 18 ns
Data-to-output 16 ns
Address-to-output 21 ns
Clear-to-output 17 ns
■ Fan-out
I
OL
(sink current) 8 mA
I
OH
(source current) −0.4 mA
■ Typical I
CC
22 mA
Ordering Code:
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Order Number Package Number Package Description
DM74LS259M M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow
DM74LS259WM M16B 16-Lead Small Outline Intergrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
DM74LS259N N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
www.fairchildsemi.com 2
DM74LS259
Connection Diagram Function Table
Latch Selection Table
H = HIGH Level
L = LOW Level
D = the Level of the Data Input
Q
i0
= the Level of Q
i
(i = 0, 1,…7, as Appropriate) before the Indicated
Steady-State Input Conditions Were Established.
Inputs Output of Each
Addressed Other Function
Clear E
Latch Output
HL D Q
i0
Addressable Latch
HH Q
i0
Q
i0
Memory
L L D L 8-Line Demultiplexer
L H L L Clear
Select Inputs Latch
C B A Addressed
LLL 0
LLH 1
LHL 2
LHH 3
HLL 4
HLH 5
HHL 6
HHH 7
3 www.fairchildsemi.com
DM74LS259
Absolute Maximum Ratings(Note 1)
Note 1: The “Absolute Maximum Ratings” are those values beyond which
the safety of the device cannot be guaranteed. The device should not be
operated at these limits. The parametric values defined in the “Electrical
Characteristics” table are not guaranteed at the absolute maximum ratings.
The “Recommended Operating Conditions” table will define the conditions
for actual device operation.
Recommended Operating Conditions
Note 2: The symbols (↓, ↑) indicate the edge of the clock pulse used for reference: ↑ for rising edge, ↓ for falling edge.
Note 3: Setup and hold times are with reference to the enable input.
Note 4: The select-to-enable setup time is the time before the HIGH-to-LOW enable transition that the select must be stable so that the correct latch is
selected and the others not affected.
Note 5: T
A
= 25°C and V
CC
= 5V.
Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
Note 6: All typicals are at V
CC
= 5V, T
A
= 25°C.
Note 7: Not more than one output should be shorted at a time, and the duration should not exceed one second.
Note 8: I
CC
is measured with all inputs at 4.5V, and all outputs OPEN.
Supply Voltage 7V
Input Voltage 7V
Operating Free Air Temperature Range 0°C to +70°C
Storage Temperature Range −65°C to +150°C
Symbol Parameter Min Nom Max Units
V
CC
Supply Voltage 4.75 5 5.25 V
V
IH
HIGH Level Input Voltage 2 V
V
IL
LOW Level Input Voltage 0.8 V
I
OH
HIGH Level Output Current −0.4 mA
I
OL
LOW Level Output Current 8 mA
t
W
Pulse Width Enable 15
ns
(Note 5) Clear 15
t
SU
Setup Time Data 15↑
ns
(Note 2)(Note 3)(Note 4)(Note 5) Select 15↓
t
H
Hold Time Data 2.5↑
ns
(Note 2)(Note 3)(Note 5) Select 2.5↑
T
A
Free Air Operating Temperature 0 70 °C
Symbol Parameter Conditions Min
Typ
Max Units
(Note 6)
V
I
Input Clamp Voltage V
CC
= Min, I
I
= −18 mA −1.5 V
V
OH
HIGH Level V
CC
= Min, I
OH
= Max
2.7 3.4 V
Output Voltage V
IL
= Max, V
IH
= Min
V
OL
LOW Level V
CC
= Min, I
OL
= Max
0.35 0.5
Output Voltage V
IL
= Max, V
IH
= Min V
I
OL
= 4 mA, V
CC
= Min 0.25 0.4
I
I
Input Current @ Max V
CC
= Max, V
I
= 7V
0.1 mA
Input Voltage V
I
= 10V
I
IH
HIGH Level Input Current V
CC
= Max, V
I
= 2.7V 20 µA
I
IL
LOW Level Input Current V
CC
= Max, V
I
= 0.4V −0.4
mA
Enable V
CC
= Max, V
I
= 0.4V −0.8
I
OS
Short Circuit Output Current V
CC
= Max (Note 7) −20 −100 mA
I
CC
Supply Current V
CC
= Max (Note 8) 22 36 mA
P1-P3P4-P6

DM74LS259N

Mfr. #:
Buy DM74LS259N
Manufacturer:
ON Semiconductor / Fairchild
Description:
Latches 8-Bit Serial Latches
Lifecycle:
New from this manufacturer.
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