74F521PC各脚功能电路原理芯片引脚定义引脚图及功能IC贸易商-中国IC网-芯三七

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产品型号74F521PC的概述

1. 芯片74F521PC的概述 74F521PC是一个高性能的双向计数器芯片，属于74F系列逻辑芯片。它被广泛应用于数字电路设计中，尤其在需要计数、定时或频率合成的场合。作为一个CMOS（互补金属氧化物半导体）集成电路，该芯片在低功耗、高速和高抗干扰性方面表现优异。 74F521PC能够进行双向计数，这意味着它能够在升高和降低的脉冲信号下分别进行计数。这一特性使其在各类应用中具有灵活性。例如，在数字时钟、频率计、以及各种仪器的计时器中，74F521PC都表现出色。 2. 芯片74F521PC的详细参数 74F521PC 的一些关键参数包括： - 电源电压（Vcc）：4.5V 至 5.5V - 输入电平：Vih（高电平输入电压）为2V，Vil（低电平输入电压）为0.8V - 输出电平：VoH（高电平输出电压）为3.5V，VoL（低电平输出电压）为0.5V - 工作温度范围：-40°C ...

产品型号74F521PC的Datasheet PDF文件预览

May 1995

54F/74F521

8-Bit Identity Comparator

General Description

The ’F521 is an expandable 8-bit comparator. It compares

two words of up to eight bits each and provides a LOW

output when the two words match bit for bit. The expansion

Features

Compares two 8-bit words in 6.5 ns typ

Expandable to any word length

20-pin package

input I

also serves as an active LOW enable input.

Package

Commercial

Military

Package Description

Number

74F521PC

N20A

20-Lead (0.300 Wide) Molded Dual-In-Line

54F521DM (Note 2)

J20A

20-Lead Ceramic Dual-In-Line

74F521SC (Note 1)

74F521SJ (Note 1)

74F521MSA (Note 1)

M20B

M20D

MSA20

20-Lead (0.300 Wide) Molded Small Outline, JEDEC

20-Lead (0.300 Wide) Molded Small Outline, EIAJ

20-Lead Molded Shrink Small Outline, EIAJ type II

Note 1: Devices also available in 13 reel. Use suffix

SCX, SJX and MSAX.

Note 2: Military grade device with environmental and burn-in processing. Use suffix

DMQB.

Logic Symbols

IEEE/IEC

TL/F/9545–1

TL/F/9545–4

TRI-STATEÉ is a registered trademark of National Semiconductor Corporation.

1995 National Semiconductor Corporation

TL/F/9545

RRD-B30M75/Printed in U. S. A.

Unit Loading/Fan Out

54F/74F

Pin Names

Description

U.L.

Input I /I

IH IL

Output I /I

HIGH/LOW

OH OL

20 mA/ 0.6 mA

A –A

Word A Inputs

1.0/1.0

50/33.3

B –B

Word B Inputs

Expansion or Enable Input (Active LOW)

Identity Output (Active LOW)

1 mA/20 mA

Truth Table

Inputs

Output

A, B

HIGH Voltage Level

LOW Voltage Level

B , A B , etc.

B , A

Connection Diagrams

Logic Diagram

Pin Assignment for DIP,

SOIC, SSOP and Flatpak

TL/F/9545–2

Pin Assignment

for LCC

TL/F/9545–5

Please note that this diagram is provided only for the understanding of logic operations and should not be

used to estimate propagation delays.

TL/F/9545–3

Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales

Office/Distributors for availability and specifications.

Recommended Operating

Conditions

Free Air Ambient Temperature

Military

Commercial

55 C to 125 C

0 C to 70 C

65 C to 150 C

Storage Temperature

55 C to 125 C

Ambient Temperature under Bias

Supply Voltage

Military

Commercial

a a

4.5V to 5.5V

a a

4.5V to 5.5V

Junction Temperature under Bias

Plastic

55 C to 175 C

55 C to 150 C

Pin Potential to

Ground Pin

0.5V to 7.0V

Input Voltage (Note 2)

Input Current (Note 2)

Voltage Applied to Output

30 mA to 5.0 mA

in HIGH State (with V

Standard Output

0V)

0.5V to 5.5V

0.5V to V

TRI-STATE Output

Current Applied to Output

in LOW State (Max)

twice the rated I (mA)

Note 1: Absolute maximum ratings are values beyond which the device may

be damaged or have its useful life impaired. Functional operation under

these conditions is not implied.

Note 2: Either voltage limit or current limit is sufficient to protect inputs.

DC Electrical Characteristics

54F/74F

Symbol

Parameter

Units

Conditions

Min

Typ

Max

Input HIGH Voltage

2.0

Recognized as a HIGH Signal

Recognized as a LOW Signal

Input LOW Voltage

0.8

e b

18 mA

Input Clamp Diode Voltage

1.2

Min

e b

Output HIGH

Voltage

54F 10% V

2.5

2.7

1 mA

74F 10% V

74F 5% V

Output LOW

Voltage

54F 10% V

74F 10% V

0.5

20 mA

Min

Max

0.0

0.5

Input HIGH

Current

54F

74F

20.0

5.0

2.7V

7.0V

Input HIGH Current

Breakdown Test

54F

74F

100

7.0

BVI

Output HIGH

54F

74F

250

CEX

OUT

Leakage Current

All Other Pins Grounded

Input Leakage

Test

1.9 mA

74F

4.75

IOD

Output Leakage

Circuit Current

150 mV

3.75

0.0

All Other Pins Grounded

0.5V

Input LOW Current

0.6

Max

OUT

Output Short-Circuit Current

Power Supply Current

150

CCH

HIGH

AC Electrical Characteristics

74F

54F

74F

e a

25 C

5.0V

50 pF

, V

Mil

, V

Com

50 pF

A CC

e a

Symbol

Parameter

Units

50 pF

Min

Typ

Max

Min

Max

Min

Max

Propagation Delay

3.0

4.5

7.0

10.0

3.0

4.0

14.0

15.0

3.0

4.0

11.0

PLH

or B to O

n A

PHL

Propagation Delay

to O

3.0

3.5

5.0

6.5

9.0

3.0

3.5

8.5

3.0

3.5

7.5

PLH

13.5

10.0

PHL

Applications

Ripple Expansion

TL/F/9545–6

Parallel Expansion

TL/F/9545–7

Ordering Information

The device number is used to form part of a simplified purchasing code where the package type and temperature range are

defined as follows:

74F 521

Temperature Range Family

Special Variations

74F

54F

Commercial

Military

Military grade device with

environmental and burn-in

processing

Device Type

Devices shipped in 13 reel

Package Code

Temperature Range

MSA

Plastic DIP

Ceramic DIP

Flatpak

Small Outline SOIC JEDEC

Small Outline SOIC EIAJ

Shrink Small Outline (EIAJ SSOP)

Commercial (0 C to 70 C)

b a

Military ( 55 C to 125 C)

NOTE:

Not required for MSA package code

Physical Dimensions inches (millimeters)

20-Lead Ceramic Dual-In-Line Package (D)

NS Package Number J20A

20-Lead (0.300 Wide) Molded Small Outline Package, JEDEC (S)

NS Package Number M20B

Physical Dimensions inches (millimeters) (Continued)

20-Lead (0.300 Wide) Molded Small Outline Package, EIAJ (SJ)

NS Package Number M20D

20-Lead (0.300 Wide) Molded Dual-In-Line Package (P)

NS Package Number N20A

Physical Dimensions inches (millimeters) (Continued)

20-Lead (0.300 Wide) Molded Shrink Outline Package, EIAJ, Type II (MSA)

NS Package Number MSA20

Physical Dimensions inches (millimeters) (Continued)

20-Lead Ceramic Flatpak (F)

NS Package Number W20A

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 CORPORATION. As used herein:

1. Life support devices or systems are devices or

systems which, (a) are intended for surgical implant

into the body, or (b) support or sustain life, and whose

failure to perform, when properly used in accordance

with instructions for use provided in the labeling, can

be reasonably expected to result in a significant injury

to the user.

2. A critical component is any component of a life

support device or system whose failure to perform can

be reasonably expected to cause the failure of the life

support device or system, or to affect its safety or

effectiveness.

National Semiconductor

Corporation

2900 Semiconductor Drive

P.O. Box 58090

Santa Clara, CA 95052-8090

Tel: 1(800) 272-9959

TWX: (910) 339-9240

National Semiconductor

GmbH

Livry-Gargan-Str. 10

D-82256 Furstenfeldbruck

Germany

Tel: (81-41) 35-0

Telex: 527649

Fax: (81-41) 35-1

National Semiconductor National Semiconductor

National Semiconductores

Do Brazil Ltda.

Rue Deputado Lacorda Franco

120-3A

Sao Paulo-SP

Brazil 05418-000

Tel: (55-11) 212-5066

Telex: 391-1131931 NSBR BR

Fax: (55-11) 212-1181

National Semiconductor

(Australia) Pty, Ltd.

Building 16

Business Park Drive

Monash Business Park

Nottinghill, Melbourne

Victoria 3168 Australia

Tel: (3) 558-9999

Japan Ltd.

Hong Kong Ltd.

Sumitomo Chemical

Engineering Center

Bldg. 7F

13th Floor, Straight Block,

Ocean Centre, 5 Canton Rd.

Tsimshatsui, Kowloon

1-7-1, Nakase, Mihama-Ku Hong Kong

Chiba-City,

Tel: (852) 2737-1600

Fax: (852) 2736-9960

Ciba Prefecture 261

Tel: (043) 299-2300

Fax: (043) 299-2500

Fax: (3) 558-9998

National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.

74F521PC相关文章

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74F521PC产品参数

型号:	74F521PC
是否无铅：	不含铅
是否Rohs认证：	符合
生命周期：	Contact Manufacturer
IHS 制造商：	ROCHESTER ELECTRONICS LLC
零件包装代码：	DIP
包装说明：	0.300 INCH, PLASTIC, MS-001, DIP-20
针数：	20
Reach Compliance Code：	unknown
HTS代码：	8542.39.00.01
风险等级：	5.61
Is Samacsys：	N
其他特性：	CASCADABLE
系列：	F/FAST
JESD-30 代码：	R-PDIP-T20
JESD-609代码：	e3
长度：	26.075 mm
逻辑集成电路类型：	IDENTITY COMPARATOR
位数：	8
功能数量：	1
端子数量：	20
最高工作温度：	70 °C
最低工作温度：
输出极性：	INVERTED
封装主体材料：	PLASTIC/EPOXY
封装代码：	DIP
封装形状：	RECTANGULAR
封装形式：	IN-LINE
峰值回流温度（摄氏度）：	NOT APPLICABLE
传播延迟（tpd）：	11 ns
认证状态：	Not Qualified
座面最大高度：	5.08 mm
最大供电电压 (Vsup)：	5.5 V
最小供电电压 (Vsup)：	4.5 V
标称供电电压 (Vsup)：	5 V
表面贴装：	NO
技术：	TTL
温度等级：	COMMERCIAL
端子面层：	MATTE TIN
端子形式：	THROUGH-HOLE
端子节距：	2.54 mm
端子位置：	DUAL
处于峰值回流温度下的最长时间：	NOT APPLICABLE
宽度：	7.62 mm
Base Number Matches：	1

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