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74LS85

更新时间： 2024-11-17 22:53:19

品牌	Logo	应用领域
安森美 - ONSEMI		/
页数	文件大小	规格书
8页	137K
描述
LOW POWER SCHOTTKY

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中文翻译

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数据手册

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74LS85 数据手册

The SN74LS85 is a 4-Bit Magnitude Camparator which compares

two 4-bit words (A, B), each word having four Parallel Inputs

(A –A , B –B ); A , B being the most significant inputs. Operation

is not restricted to binary codes, the device will work with any

monotonic code. Three Outputs are provided: “A greater than B”

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), “A less than B” (O

), “A equal to B” (O

, allow cascading without external

). Three

LOW

POWER

SCHOTTKY

A>B

A<B

A=B

Expander Inputs, I

gates. For proper compare operation, the Expander Inputs to the least

significant position must be connected as follows: I

, I

A>B A<B A=B

= I

= L,

A<B

A>B

= H. For serial (ripple) expansion, the O

, O

, I

and O

, and I

A=B

A>B

A<B

A=B

Outputs are connected respectively to the I

A>B A<B

Inputs of the next most significant comparator, as shown in Figure 1.

Refer to Applications section of data sheet for high speed method of

comparing large words.

The Truth Table on the following page describes the operation of the

SN74LS85 under all possible logic conditions. The upper 11 lines

describe the normal operation under all conditions that will occur in a

single device or in a series expansion scheme. The lower five lines

describe the operation under abnormal conditions on the cascading

inputs. These conditions occur when the parallel expansion technique

is used.

PLASTIC

N SUFFIX

CASE 648

• Easily Expandable

• Binary or BCD Comparison

• O

, O

, and O

Outputs Available

A>B

A<B

A=B

GUARANTEED OPERATING RANGES

Symbol

Parameter

Supply Voltage

Min

4.75

Typ

5.0

Max

5.25

Unit

SOIC

D SUFFIX

CASE 751B

Operating Ambient

Temperature Range

°C

Output Current – High

Output Current – Low

–0.4

8.0

ORDERING INFORMATION

Device

Package

16 Pin DIP

16 Pin

Shipping

SN74LS85N

SN74LS85D

2000 Units/Box

2500/Tape & Reel

Semiconductor Components Industries, LLC, 1999

Publication Order Number:

December, 1999 – Rev. 6

SN74LS85/D

12 3 4 5 6 7 8

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