74LS259DCQR

更新时间： 2024-01-25 16:41:14

品牌	Logo	应用领域
飞兆/仙童 - FAIRCHILD		锁存器
页数	文件大小	规格书
6页	62K
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数据手册

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74LS259DCQR 数据手册

August 1986

Revised March 2000

DM74LS259

8-Bit Addressable Latches

General Description

Features

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.

■ 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

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.

Data-to-output

16 ns

Address-to-output 21 ns

Clear-to-output

■ Fan-out

17 ns

8 mA

I_OL(sink current)

I_OH(source current) −0.4 mA

■ Typical I_CC22 mA

Ordering Code:

Order Number Package Number

Package Description

DM74LS259M

DM74LS259WM

DM74LS259N

M16A

M16B

N16E

16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow

16-Lead Small Outline Intergrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide

16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide

Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.

DS006418

www.fairchildsemi.com

12 3 4 5 6

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74LS260DCQR	FAIRCHILD	获取价格	NOR Gate, TTL, CDIP14,
74LS260FCQM	FAIRCHILD	获取价格	NOR Gate, TTL, CDFP14,
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