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March 1995

Revised December 2013

74LCX138 Low Voltage 1-of-8 Decoder/Demultiplexer with 5V Tolerant Inputs

74LCX138

Low Voltage 1-of-8 Decoder/Demultipl exer

with 5V Tolerant Inputs

General Description

The LCX13 8 is a high- spee d 1-of-8 decoder /demu ltiplex er.

This device is ideally suited for high-speed memory chip

select ad dress decoding . The multip le input enabl es allow

parallel expansion to a 1-of-24 decoder using just three

LCX138 devices or a 1-of-32 decoder using four LCX138

devices and one inverter.

The 74LCX138 is fabricated with advanced CMOS technol-

ogy to achieve high speed operation while maintaining

CMOS low power dissipation.

Features

■5V tolerant inputs

■2.3V to 3.6V VCC specifications p ro vided

■6.0 ns tPD max (VCC = 3.3V), 10 µA ICC max

■Power down high impedance inputs and outputs

■±24 mA output drive (VCC = 3.0V)

■Implements patented noise/EMI reduction circuitry

■Latch-up per for man c e exce eds 500 mA

■ESD performance :

Human body model > 2000V

Machine model > 200V

■Leadless DQFN package

Ordering Code:

Note 1: Devices al so av ailable in Tape and Reel. Spec if y by appending suffix letter “X” to the ordering code.

Note 2: DQFN package available in Tape and Reel only.

Order Number Package

Number Package Description

74LCX138M

(Note 1) M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow

74LCX138SJ

(Note 1) M16D 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide

74LCX138BQX

(Note 2) MLP016E 16-Terminal Depopulated Quad Very-Thin Flat Pack No Leads (DQFN), JEDEC MO-241,

2.5 x 3.5mm

74LCX138MTC

(Note 1) MTC16 16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide

2013

www.fairchildsemi.com 2

74LCX138

Connection Diagrams

Pin Assignments for SOIC, SOP, and TSSOP

Pad Assignments for DQFN

(Top Through View)

Pin Descriptions

Functional Description

The LCX138 high-speed 1-of-8 decoder/demultiplexer

accepts three binary weighted inputs (A0, A1, A2) and,

when enabled, provides eight mutually exclusive active-

LOW ou tputs (O 0–O7). T he LCX 138 feature s thre e Ena ble

inputs, two active -L OW (E 1, E2) an d one active-HI GH (E 3).

All outputs will be HIGH unless E1 and E2 are LOW and E3

is HIGH . Th e LC X1 38 can b e u sed as an 8-outp ut demulti-

plexer by using one of the active LOW Enable inputs as the

data input and the other Enable inputs as strobes. The

Enable inputs which are not used must be permanently tied

to their appropriate active-HIGH or active-LOW state.

Truth Table

H = HIGH Voltage Le ve l

L = LOW Voltage Level

X = Immaterial

Pin Nam es Descri ption

A0–A2Address Inp uts

E1–E2Enable Inputs

E3Enable Input

O0–O7Outputs

Inputs Outputs

E1E2E3A0A1A2O0O1O2O3O4O5O6O7

HXXXXXHHHHHHHH

XHXXXXHHHHHHHH

XXLXXXHHHHHHHH

LLHLLLLHHHHHHH

LLHHLLHLHHHHHH

LLHLHLHHLHHHHH

LLHHHLHHHLHHHH

LLHLLHHHHHLHHH

LLHHLHHHHHHLHH

LLHLHHHHHHHHLH

LLHHHHHHHHHHHL

(Bottom View)

DAP No Connect

Note: DAP (Die Attach Pad)

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74LCX138

Logic Diagram

Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.

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74LCX138

Absolute Maximum Ratings(No te 3)

Recommended Operating Conditions (Note 5)

Note 3: The Absolute Maximum Ratings are those values beyond which the safety of the device cannot be guaranteed. The device should not be operated

at these limits. The parametric values defined in the Electrical Characteristics tables are not guaranteed at the Absolute Maximum Rating s. The “Recom-

mend ed Operat ing Conditions” table will define the co nditions fo r ac t ual device operation.

Note 4: IO Absolute Maximum Rating must be observed.

Note 5: Unused inputs must be held HIGH or LO W. They may not float.

DC Electrical Characteristics

Symbol Parameter Value Conditions Units

VCC Supply Vo lt age −0.5 to +7.0 V

VIDC Input Voltage −0.5 to +7.0 V

VODC Output Vo l tag e −0.5 to VCC + 0.5 Output in HIGH or LOW State (Note 4) V

IIK DC Input Diode Current −50 VI < GND mA

IOK DC Output Diode Current −50 VO < GND mA

+50 VO > VCC

IODC Output Source/Sink Current ±50 mA

ICC DC Supply Current per Supply Pin ±100 mA

IGND DC Ground Current per Ground Pin ±100 mA

TSTG Storage Temperature −65 to +150 °C

Symbol Parameter Min Max Units

VCC Supply Voltage Operating 2.0 3.6 V

Data Retention 1.5 3.6

VIInput Voltage 0.0 5.5 V

VOOutput Voltage HIGH or LOW State 0.0 VCC V

IOH/IOL Output Current VCC = 3.0V to 3.6V ±24.0 mAVCC = 2.7V to 3.0V ±12.0

VCC = 2.3V to 2.7V ±8.0

TAFree-Air Operating Temper ature −40.0 85.0 °C

∆t/∆V Input Edge Rate, VIN = 0.8V to 2.0V, VCC = 3.0V 0.0 10.0 ns/V

Symbol Parameter Conditions VCC TA = −40°C to +85°CUnits

(V) Min Max

VIH HIGH Level Input Voltage 2.3 to 2.7 1.7 V

2.7 to 3.6 2.0

VIL LOW Level Input Voltage 2.3 to 2.7 0.7 V

2.7 to 3.6 0.8

VOH HIGH Level Output Voltage IOH = −100 µA 2.3 to 3.6 VCC − 0.2

IOH = -8 mA 2.3 1.8

IOH = −12 mA 2.7 2.2

IOH = −18 mA 3.0 2.4

IOH = −24 mA 3.0 2.2

VOL LOW Level Output Voltage IOL = 100 µA 2.3 to 3.6 0.2

IOL = 8mA 2.3 0.6

IOL = 12 mA 2.7 0.4

IOL = 16 mA 3.0 0.4

IOL = 24 mA 3.0 0.55

IIInput Leakage Current 0 ≤ VI ≤ 5.5V 2.3 to 3.6 ±5.0 µA

IOFF Power-Off Leakage Current VI or VO = 5.5V 0.0 10.0 µA

ICC Quiescent Supply C urrent VI = VCC or GND 2.3 to 3.6 10.0 µA

3.6V ≤ VI ≤ 5.5V 2.3 to 3.6 ±10.0

∆ICC Increase in ICC per Input VIH = VCC −0.6V 2.3 to 3.6 500 µA

5 www.fairchildsemi.com

74LCX138

AC Electrical Characteristics

Note 6: Skew is def ined as the absol ut e v alue of the difference between the actu al propaga tio n delay for any two s eparate out puts of the sam e device. The

specification app lies t o any output s swit c hing in the same direction, either HIGH-to-LOW (tOSHL) or LOW-to-H IG H (t OSLH).

Dynamic Switching Characteristics

Capacitance

Symbol Parameter

TA = −40°C t o +85°C, RL = 500Ω

Units

VCC = 3.3V ± 0.3V VCC = 2.7V VCC = 2.5V ± 0.2V

CL = 50pF CL = 50pF CL = 30pF

Min Max Min Max Min Max

tPHL Propagation Delay 1.5 6.0 1.5 7.0 1.5 7.2 ns

tPLH An to Qn 1.5 6.0 1.5 7.0 1.5 7.2

tPHL Propagation Delay 1.5 6.5 1.5 7.5 1.5 8.4 ns

tPLH E3 to Qn 1.5 6.5 1.5 7.5 1.5 8.4

tPHL Propagation Delay 1.5 6.0 1.5 7.0 1.5 7.2 ns

tPLH E1 or E2 to Qn 1.5 6.0 1.5 7.0 1.5 7.2

tOSHL Output to Output Skew (Note 6) 1.0 ns

tOSLH 1.0

Symbol Parameter Conditions VCC TA = 25°CUnits

(V) Typical

VOLP Quiet Output Dynamic Peak VOL CL = 50 pF, VIH = 3.3V, VIL = 0V 3.3 0.8 V

CL = 30 pF, VIH = 2.5V, VIL = 0V 2.5 0.6

VOLV Quiet Output Dynamic Va lley VOL CL = 50 pF, VIH = 3.3V, VIL = 0V 3.3 −0.8 V

CL = 30 pF, VIH = 2.5V, VIL = 0V 2.5 −0.6

Symbol Parameter Conditions Typical Units

CIN Input Capacitance VCC = Open, VI = 0V or VCC 7.0 pF

COUT Output Capacitance VCC = 3.3V, VI = 0V or VCC 8.0 pF

CPD Power Dissipation Capacitance VCC = 3.3V, VI = 0V or VCC, f = 10 MHz 25.0 pF

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74LCX138

AC Loading and Waveforms Generic for LCX Family

FIGURE 1. AC Test Circuit

(CL includes probe and jig capacitance)

Waveform for Inverting and Non-Inverting Functions

Prop agation Delay, Pulse Width and trec Waveforms

3-STATE Output High Enab le and

Disable Times for Logic

3-STATE Output Low Enable and

Disable Times for Logic

Setup Time, Hold TIme and Reco very TIme for Logic

trise and tfall

FIGURE 2. Waveforms

(Input Pulse Characteristics; f = 1MHz, tr = tf = 3ns)

Test Switch

tPLH, tPHL Open

tPZL, tPLZ 6V at VCC = 3.3V ± 0.3V

VCC x 2 at VCC = 2.5V ± 0.2V

tPZH, tPHZ GND

Symbol VCC

3.3V ± 0.3V 2.7V 2.5V ± 0.2V

Vmi 1.5V 1.5V VCC/2

Vmo 1.5V 1.5V VCC/2

VxVOL + 0.3V VOL + 0.3V VOL + 0.15V

VyVOH − 0.3V VOH − 0.3V VOH − 0.15V

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74LCX138

Schematic Diagram Generic for LCX Family

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74LCX138

Tape and Reel Specification

Tape Fo rmat for DQFN

TAPE DIMENSIONS inches (millimeters)

REEL DIMENSIONS inches (millimeters)

Package Tape Number Cavity Cover Tape

Designator Section Cavities Status Status

Leader (Start End) 125 (typ) Empty Sealed

BQX Carrier 3000 Filled Sealed

Trailer (Hub End) 75 (typ) Empty Sealed

Tape SizeABCDNW1W2

12 mm 13.0 0.059 0.512 0.795 2.165 0.488 0.724

(330.0) (1.50) (13.00) (20.20) (55.00) (12.4) (18.4)

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74LCX138

Physical Dim ensions inches (millimeters) unless otherwise noted

16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow

Package Number M16A

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74LCX138

Physical Dimensions inches (millimeters) unless otherwise noted (Continued)

16-Lead Sma ll Outline Package (SOP), EIAJ T YPE II, 5. 3mm Wide

Package Number M16D

11 www.fairchildsemi.com

74LCX138

Physical Dim ensions inches (millimeters) unless otherwise noted (Continued)

16-Terminal Depopulated Quad Very-Thin Flat Pack No Leads (DQFN), JEDEC MO-241, 2.5 x 3.5mm

Package Number MLP016E

www.fairchildsemi.com 12

74LCX138 Low Voltage 1-of-8 Decoder/Demultiplexer with 5V Tolerant Inputs

Physical Dimensions inches (millimeters) unless otherwise noted (Continued)

16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide

Package Number MTC16

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Fairchild reserves the right at any time without notice to change said circuitry and specifications.

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FAIRCHILD’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 FAIRCHILD

SEMICONDUCTOR CORPORATION. As used herein:

1. Life suppor t de vices o r syste ms are devices or syste ms

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coverage may be accessed at www.onsemi.com/site/pdf/Patent−Marking.pdf. ON Semiconductor reserves the right to make changes without further notice to any products herein.

ON Semiconductor makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does ON Semiconductor assume any liability

arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.

Buyer is responsible for its products and applications using ON Semiconductor products, including compliance with all laws, regulations and safety requirements or standards,

regardless of any support or applications information provided by ON Semiconductor. “Typical” parameters which may be provided in ON Semiconductor data sheets and/or

specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer

application by customer’s technical experts. ON Semiconductor does not convey any license under its patent rights nor the rights of others. ON Semiconductor products are not

designed, intended, or authorized for use as a critical component in life support systems or any FDA Class 3 medical devices or medical devices with a same or similar classification

in a foreign jurisdiction or any devices intended for implantation in the human body. Should Buyer purchase or use ON Semiconductor products for any such unintended or unauthorized

application, Buyer shall indemnify and hold ON Semiconductor and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and

expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such

claim alleges that ON Semiconductor was negligent regarding the design or manufacture of the part. ON Semiconductor is an Equal Opportunity/Affirmative Action Employer. This

literature is subject to all applicable copyright laws and is not for resale in any manner.

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