DM74LS259N

DM74LS259N Datasheet

DM74LS259 8-Bit Addressable Latches

Part	Datasheet
DM74LS259N	DM74LS259N (pdf)

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DM74LS259 8-Bit Addressable Latches DM74LS259 8-Bit Addressable Latches 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 multifunctional 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 controlling the clear and enable inputs as enumerated in the function table. In the addressable-latch mode, data at the datain terminal is written into the addressed latch. The addressed 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 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. s 8-Bit parallel-out storage register performs serial-to-parallel conversion with storage s Asynchronous parallel clear s Active high decoder s Enable/disable input simplifies expansion s Direct replacement for Fairchild DM9334 s Expandable for N-bit applications s Four distinct functional modes s Typical propagation delay times: Enable-to-output 18 ns Data-to-output 16 ns Address-to-output 21 ns Clear-to-output s Fan-out 17 ns IOL sink current IOH source current mA s Typical ICC 22 mA Ordering Code: Order Number Package Number Package Description DM74LS259M M16A 16-Lead Small Outline Integrated Circuit SOIC , JEDEC MS-012, Narrow DM74LS259WM M16B 16-Lead Small Outline Intergrated Circuit SOIC , JEDEC MS-013, Wide DM74LS259N N16E 16-Lead Plastic Dual-In-Line Package PDIP , JEDEC MS-001, Wide Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code. 2000 Fairchild Semiconductor Corporation DS006418 DM74LS259 Connection Diagram Function Table Inputs Clear E HL HH LL LH Output of Addressed Latch D Qi0 D L Each Other Function Output Qi0 Addressable Latch Qi0 Memory L 8-Line Demultiplexer L Clear Latch Selection Table Select Inputs Latch Addressed H = HIGH Level L = LOW Level D = the Level of the Data Input Qi0 = the Level of Qi i = 0, as Appropriate before the Indicated Steady-State Input Conditions Were Established. DM74LS259 Absolute Maximum Ratings Note 1 Supply Voltage Input Voltage Operating Free Air Temperature Range 0°C to +70°C Storage Temperature Range −65°C to +150°C 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 Parameter Units Supply Voltage HIGH Level Input Voltage LOW Level Input Voltage HIGH Level Output Current LOW Level Output Current Pulse Width Enable Note 5 Clear

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DM74LS259 8-Bit Addressable Latches

DM74LS259 8-Bit Addressable Latches

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 multifunctional 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 controlling the clear and enable inputs as enumerated in the function table. In the addressable-latch mode, data at the datain terminal is written into the addressed latch. The addressed 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 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.
s 8-Bit parallel-out storage register performs serial-to-parallel conversion with storage
s Asynchronous parallel clear s Active high decoder
s Enable/disable input simplifies expansion s Direct replacement for Fairchild DM9334
s Expandable for N-bit applications s Four distinct functional modes
s Typical propagation delay times:

Enable-to-output 18 ns

Data-to-output 16 ns

Address-to-output 21 ns

Clear-to-output s Fan-out
17 ns

IOL sink current

IOH source current mA
s Typical ICC 22 mA
Ordering Code:

Order Number Package Number

Package Description

DM74LS259M

M16A
16-Lead Small Outline Integrated Circuit SOIC , JEDEC MS-012, Narrow

DM74LS259WM

M16B
16-Lead Small Outline Intergrated Circuit SOIC , JEDEC MS-013, Wide

DM74LS259N

N16E
16-Lead Plastic Dual-In-Line Package PDIP , JEDEC MS-001, Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
2000 Fairchild Semiconductor Corporation DS006418

DM74LS259

Connection Diagram

Function Table

Inputs

Clear E HL HH LL LH

Output of Addressed

Latch D Qi0 D L

Each

Other

Function

Output

Qi0 Addressable Latch Qi0 Memory L 8-Line Demultiplexer

L Clear

Latch Selection Table

Select Inputs

Latch

Addressed

H = HIGH Level L = LOW Level D = the Level of the Data Input Qi0 = the Level of Qi i = 0, as Appropriate before the Indicated

Steady-State Input Conditions Were Established.

DM74LS259

Absolute Maximum Ratings Note 1

Supply Voltage

Input Voltage

Operating Free Air Temperature Range 0°C to +70°C

Storage Temperature Range
−65°C to +150°C

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

Parameter

Units

Supply Voltage

HIGH Level Input Voltage

LOW Level Input Voltage

HIGH Level Output Current

LOW Level Output Current

Pulse Width

Enable

Note 5

Clear

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Datasheet ID: DM74LS259N 513787