U74HCT138L-S16-T [UTC]

3-TO-8 LINE DECODERS / DEMULTIPLEXERS; 3至8线路解码器/多路解复用器


型号：	U74HCT138L-S16-T
厂家：	Unisonic Technologies
描述：	3-TO-8 LINE DECODERS / DEMULTIPLEXERS 3至8线路解码器/多路解复用器解码器解复用器
文件：	总5页 (文件大小：193K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

UNISONIC TECHNOLOGIES CO., LTD

U74HCT138

CMOS IC

3-TO-8 LINE DECODERS /

DEMULTIPLEXERS

DESCRIPTION

The U74HCT138 decodes

a three−bit Address to 1−of−8

active−low outputs.

This device features three Chip Select inputs, two active−low and

one active−high, to facilitate the demultiplexing, cascading and

chip−selecting functions.

The demultiplexing function is accomplished by using the Address

inputs to select the desired device output. One of the Chip Selects is

used as a data input while the other Chip Selects are held in their

active states.

FEATURES

* Operate from 4.5V to 5.5V

* Low Input Current:1.0uA Max

* Low Power Consumption: 8μA Max

* Typical t_PD=15ns

* Inputs are TTL voltage compatible

ORDERING INFORMATION

Ordering Number

Lead Free

Package

Packing

Halogen Free

U74HCT138L-S16-R

U74HCT138L-S16-T

U74HCT138G-S16-R

U74HCT138G-S16-T

SOP-16

Tape Reel

Tube

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U74HCT138

CMOS IC

PIN CONFIGURATION

V_CC

13 Y2

GND

FUNCTION TABLE

INPUTS

OUTPUTS

Note:H : High voltage level

: Low voltage level

: Don’t care

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U74HCT138

CMOS IC

LOGIC SYMBOL

LOGIC DIAGRAM

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U74HCT138

CMOS IC

ABSOLUTE MAXIMUM RATING

PARAMETER

SYMBOL

V_CC

I_IK

RATINGS

-0.5 ~ 7.0

±20

UNIT

Supply Voltage

Input Clamp Current(V_I<0 or V_I>V_CC

Output Clamp Current(V_O<0 or V_O>V_CC

)

℃

)

I_OK

±20

Continuous Output Current(V_O=0 to V_CC

)

I_O

±25

V_CCor GND Current

I_CC

±50

Storage Temperature

T_STG

-65 ~ + 150

Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged.

Absolute maximum ratings are stress ratings only and functional device operation is not implied.

RECOMMENDED OPERATING CONDITIONS

PARAMETER

SYMBOL

V_CC

TEST CONDITIONS

Operating

MIN TYP MAX UNIT

4.5

5.0

5.5

V_CC

+85

500

Supply Voltage

Input Voltage

V_IN

Output Voltage

V_OUT

T_A

t_R, t_F

-40

℃

Operating Temperature

Input Rise or Fall Times

V_CC=4.5V~5.5V

ELECTRICAL CHARACTERISTICS(T_A=25℃)

PARAMETER

SYMBOL

V_IH

TEST CONDITIONS

V_CC=4.5V~5.5V

MIN TYP MAX UNIT

High-Level input voltage

Low-Lever output voltage

2.0

V_IL

V_CC=4.5V~5.5V

0.8

V_CC=4.5V, I_OH=-20μA

V_CC=4.5V, I_OH=-4mA

V_CC=4.5V, I_OL=20μA

4.4 4.499

3.98 4.3

High-Level Output Voltage

Low-Level Output Voltage

V_OH

V_OL

0.001 0.1

0.17 0.26

V_CC=4.5V, I_OL=4mA

Input Leakage Current

I_I(LEAK)

I_CC

V_CC=5.5V, V_IN= V_CCor GND

V_CC=5.5V, V_IN=V_CCor GND, I_OUT=0

One input at 0.5V or 2.4V,other

inputs at 0 or Vcc

±0.1 ±100 nA

Quiescent Supply Current

μA

△I_CC

Additional Quiescent Supply Current

Input Capacitance

1.4

2.4

C_I

V_CC=4.5V~5.5V

SWITCHING CHARACTERISTICS(T_A=25℃,see TEST CIRCUIT AND WAVEFORMS)

PARAMETER

SYMBOL

TEST CONDITIONS

V_CC=4.5V, C_L=50pF

MIN TYP MAX UNIT

Propagation delay from input

t_PLH/t_PHL

V_CC=5.5V, C_L=50pF

V_CC=4.5V, C_L=50pF

V_CC=5.5V, C_L=50pF

V_CC=4.5V, C_L=50pF

V_CC=5.5V, C_L=50pF

(An) to output( Yn )

Propagation delay from input

_PLH/t_PHL

(En) to output( Yn )

Output Transition Time

t_TLH/t_THL

OPERATING CHARACTERISTICS

PARAMETER

Power Dissipation Capacitance

SYMBOL

C_PD

TEST CONDITIONS

MIN TYP MAX UNIT

No load

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U74HCT138

CMOS IC

TEST CIRCUIT AND WAVEFORMS

Test Circuit

Propagation Delay and Output Tansition Times

Note: C_Lincludes probe and jig capacitance.

All input pulses are supplied by generators having the following characteristics: Zo = 50Ω, t_R=6ns, t_F=6ns.

UTC assumes no responsibility for equipment failures that result from using products at values that

exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or

other parameters) listed in products specifications of any and all UTC products described or contained

herein. UTC products are not designed for use in life support appliances, devices or systems where

malfunction of these products can be reasonably expected to result in personal injury. Reproduction in

whole or in part is prohibited without the prior written consent of the copyright owner. The information

presented in this document does not form part of any quotation or contract, is believed to be accurate

and reliable and may be changed without notice.

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