Diodes 74HCT126 User Manual

74HCT126

QUADRUPLE 3-STATE BUFFERS OE HIGH

Description

The 74HCT126 provides provides four independent buffer gates with

3-state outputs. Each buffer has a separate enable pin that if driven

with a low logic level places the corresponding output in the high

impedance state. The device is designed for operation with a power

supply range of 4.5V to 5.5V.

Pin Assignments

Features

• Wide Supply Voltage Range from 4.5V to 5.5V

• Pin Compatible with Low Power Schottky (LSTTL)

• Inputs Are TTL Voltage Level Compatible

• Sinks or sources 4mA at V

• CMOS low power consumption

• Schmitt Trigger Action at All Inputs

• ESD Protection Exceeds JESD 22

 200-V Machine Model (A115-A)

 2000-V Human Body Model (A114-A)

 Exceeds 1000-V Charged Device Model (C101C)

• Range of Package Options SO-14 and TSSOP-14

• Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)

• Halogen and Antimony Free. “Green” Device (Note 3)

Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.

2. See http://www.diodes.com for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and Lead-free.

3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.

74HCT126

Document number: DS35337 Rev. 3 - 2

= 4.5V

CC

Applications

• General Purpose Logic

• Wide array of products such as:

 PCs, networking, notebooks, netbooks

 Computer peripherals, hard drives, CD/DVD ROM

 TV, DVD, DVR, set top box

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Pin Descriptions

Pin Number

1 1OE Data Enable Input (active high)

2 1A Data Input

3 1Y Data Output

4 2OE Data Enable Input (active high)

5 2A Data Input

6 2Y Data Output

7 GND Ground

8 3Y Data Output

9 3A Data Input

10 3OE Data Enable Input (active high)

11 4Y Data Output

12 4A Data Input

13 4OE Data Enable Input (active high)

14

Pin Name Description

V

CC

Supply Voltage

Logic Diagram

74HCT126

Function Table

Inputs Output

OE A Y

H H H

H L L

L X Z

74HCT126

Document number: DS35337 Rev. 3 - 2

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74HCT126

Absolute Maximum Ratings (Note 4) (@T

= +25°C, unless otherwise specified.)

A

Symbol Description Rating Unit

ESD HBM Human Body Model ESD Protection 2 KV

ESD CDM Charged Device Model ESD Protection 1 KV

ESD MM Machine Model ESD Protection 200 V

VCC

VI

IIK Input Clamp Current VI < -0.5V or Vi > VCC +0.5V

IOK Output Clamp Current VO < -0.5V or VO > VCC +0.5V

IO Continuous Output Current -0.5V < V

ICC Continuous Current Through VCC

I

GND

TJ

T

STG

P

TOT

Notes: 4. Stresses beyond the absolute maximum may result in immediate failure or reduced reliability. These are stress values and device operation should
be within recommend values.

5. Input Voltage cannot exceed V

Supply Voltage Range -0.5 to +7.0 V

Input Voltage Range (Note 5) -0.5 to +7.0 V

±20 mA

±20 mA

O VCC

+0.5V

+/-25 mA

50 mA

Continuous Current Through GND -50 mA

Operating Junction Temperature -40 to +150 °C

Storage Temperature -65 to +150 °C

Total Power Dissipation 500 mW

to the extent the Maximum clamp current is exceeded.

CC

Recommended Operating Conditions (Note 6) (@T

= +25°C, unless otherwise specified.)

A

Symbol Parameter Conditions Min Max Unit

VCC

VI

VO

Supply Voltage

Input Voltage 0

Output Voltage 0

Δt/ΔV Input Transition Rise or Fall Rate

TA

Note: 6. Unused inputs should be held at VCC or Ground.

Operating Free-Air Temperature

V

= 4.5V to 5.5V

CC

4.5 5.5 V

VCC

VCC

V

V

500 ns/V

-40 +125 °C

Electrical Characteristics (@T

= +25°C, unless otherwise specified.)

A

Symbol Parameter Test Conditions

V

IH

VIL

VOH

VOL

IOZ

II

ICC

ΔICC

High-level Input
Voltage

Low-level Input
Voltage

High-level Output
Voltage

Low-level Output
Voltage

Z State Leakage
Current

Input Current

Supply Current

Additional Supply
Current

4.5V to 5.5V 2.0 2.0 V

4.5V to 5.5V 0.8 0.8 V

I

= -20μA

OH

IOH = -4mA

= 20μA

I

OL

IOL = 4.0mA

VO = 0 to 5.5V

VI = GND to 6.0V

VI = GND or VCC, IO = 0

One Input at V
Other Pins at V

-2.1V

CC

CC

or GND

V

CC

A

Min Max Min Max

4.5V 4.4 4.4

4.5V 3.84 3.70

4.5V 0.1 0.1

4.5V 0.33 0.4

5.5V ± 5.0 ± 10 μA

6.0V ± 1 ± 1 μA

6.0V 20 40 μA

4.5V to 5.5V 675 735 μA

Unit

V

V

= -40°C to +85°C TA = -40°C to +125°C

T

74HCT126

Document number: DS35337 Rev. 3 - 2

3 of 8

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January 2013

© Diodes Incorporated