CD74HCT257

更新时间： 2024-09-13 23:04:31

品牌	Logo	应用领域
德州仪器 - TI		复用器
页数	文件大小	规格书
7页	54K
描述
High Speed CMOS Logic Quad 2-Input Multiplexer with Three-State Non-Inverting Outputs

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CD74HCT257 数据手册

CD74HC257,

CD74HCT257

Data sheet acquired from Harris Semiconductor

SCHS171

High Speed CMOS Logic Quad 2-Input

November 1997

Multiplexer with Three-State Non-Inverting Outputs

Features

Description

• Buffered Inputs

The Harris CD74HC257 and CD74HCT257 are quad 2-input

multiplexers which select four bits of data from two sources

under the control of a common Select Input (S). The Output

Enable input (OE) is active LOW. When OE is HIGH, all of

the outputs (1Y-4Y) are in the high impedance state regard-

less of all other input conditions.

• Typical Propagation Delay ( In to Output ) = 12ns at

[ /Title

(CD74

HC257

CD74

HCT25

= 5V, C = 15pF, T = 25 C

L A

• Fanout (Over Temperature Range)

- Standard Outputs. . . . . . . . . . . . . . . 10 LSTTL Loads

- Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads

Moving data from two groups of registers to four common

output busses is a common use of the 257. The state of the

Select input determines the particular register from which

the data comes. It can also be used as a function generator.

• Wide Operating Temperature Range . . . -55 C to 125 C

• Balanced Propagation Delay and Transition Times

/Sub-

ject

• Signiﬁcant Power Reduction Compared to LSTTL

Logic ICs

Ordering Information

• HC Types

- 2V to 6V Operation

(High

Speed

CMOS

Logic

Quad

2-Input

Multi-

plexer

TEMP. RANGE

PKG.

NO.

PART NUMBER

CD74HC257E

CD74HCT257E

CD74HC257M

CD74HCT257M

NOTES:

( C)

PACKAGE

16 Ld PDIP

16 Ld SOIC

- High Noise Immunity: N = 30%, N = 30% of V

IL IH CC

at V

= 5V

-55 to 125

E16.3

• HCT Types

- 4.5V to 5.5V Operation

- Direct LSTTL Input Logic Compatibility,

E16.3

M16.15

V = 0.8V (Max), V = 2V (Min)

IL IH

- CMOS Input Compatibility, I ≤ 1µA at V , V

OL OH

1. When ordering, use the entire part number. Add the sufﬁx 96 to

obtain the variant in the tape and reel.

2. Wafer or die for this part number is available which meets all

electrical specifications. Please contact your local sales office or

Harris customer service for ordering information.

Pinout

CD74HC257, CD74HC257

(PDIP, SOIC)

TOP VIEW

16 V

15 OE

14 4I

13 4I

12 4Y

11 3I

10 3I

GND

CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.

File Number 1650.1

12 3 4 5 6 7

中文翻译

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CD74HCT257 替代型号

型号	品牌	替代类型	描述	数据表
CD54HCT257	TI	功能相似	High-Speed CMOS Logic Quad 2-Input Multiplexer with Three-State Non-Inverting Outputs

与CD74HCT257相关器件

型号	品牌	获取价格	描述	数据表
CD74HCT257E	TI	获取价格	High Speed CMOS Logic Quad 2-Input Multiplexer with Three-State Non-Inverting Outputs
CD74HCT257E	RENESAS	获取价格	MULTIPLEXER
CD74HCT257EE4	TI	获取价格	High-Speed CMOS Logic Quad 2-Input Multiplexer with Three-State Non-Inverting Outputs
CD74HCT257EN	ETC	获取价格	Logic IC
CD74HCT257F	ETC	获取价格	Logic IC
CD74HCT257H	ETC	获取价格	2-Input Digital Multiplexer
CD74HCT257M	TI	获取价格	High Speed CMOS Logic Quad 2-Input Multiplexer with Three-State Non-Inverting Outputs
CD74HCT257M96	TI	获取价格	High-Speed CMOS Logic Quad 2-Input Multiplexer with Three-State Non-Inverting Outputs
CD74HCT257M96	RENESAS	获取价格	MULTIPLEXER
CD74HCT257M96E4	TI	获取价格	High-Speed CMOS Logic Quad 2-Input Multiplexer with Three-State Non-Inverting Outputs

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