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June 1993

Revised October 2003

74LVX138 Low Voltage 1-of-8 Decoder/Dem ultiplexer

74LVX138

Low Voltage 1-of-8 Decoder/Demultipl exer

General Description

The LVX138 is a high -sp eed 1 -of-8 deco der/de multi plexer.

This device is ideally suited for high-speed bipolar memory

chip select address decoding. The multiple input enables

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

three LVX138 devices or a 1-of-32 decoder using four

LVX138 devices and one inverter.

Features

■Input voltage level translation from 5V to 3V

■Ideal for low power/low noise 3.3V applications

■Guaranteed simultaneous switching noise level and

dynamic thresh ol d per for man ce

Ordering Code:

Devices also available in Tape and R eel. Specify by appending suffix letter “X” to the ordering code.

Logic Symbols

IEEE/IEC

Connection Diagram

Pin Descriptions

Order Number Package Number Package Description

74LVX138M M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow

74LVX138SJ M16D 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide

74LVX138MTC MTC16 16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide

Pin Names Description

A0–A2Address Inputs

E1– E2Enable Inpu ts

E3Enable Inpu t

O0–O7Outputs

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74LVX138

Functional Description

The LVX138 high-speed 1-of-8 decoder/demultiplexer

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

when enabled, provides eight mutually exclusive active-

LOW outputs (O0–O7). T he LVX1 38 featur es three Enable

inputs, two a ctive- LO W (E 1, E2) and one active-HIGH (E3).

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

is HIGH.

The LVX 138 can be us ed as an 8-out put demultip lexer by

using one of the active LOW Enable inputs as the data

input and the othe r Enable input s 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

Logic Diagram

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

Inputs Outputs

E1E2 E3A0A1 A2O0O1O2O3 O4O5O6O7

HXXXXXHHHHHHHH

XHXXXXHHHHHHHH

XXLXXXHHHHHHHH

LLHL LLLHHHHHHH

LLHHLLHLHHHHHH

LLHLHLHHLHHHHH

LLHHHLHHHLHHHH

LLHL LHHHHHLHHH

LLHHLHHHHHHLHH

LLHLHHHHHHHHLH

LLHHHHHHHHHHHL

3 www.fairchildsemi.com

74LVX138

Absolute Maxim um Ratings(Note 1) Recommended Operating

Conditions (Note 2)

Note 1: The “Absolute Maximum Ratings” are those value s beyond whic h

the saf ety of the device cannot b e guaranteed . The device should not be

operated at these limits. The parametric values defined in the Electrical

Char ac teristics tables are not guaranteed at t he absolute maxim um ratings .

The “R ecomm ended Ope rating Co ndition s” table will define the condit ions

for actu al device operation.

Note 2: Unused inputs must be held HIGH or LOW. They may not floa t.

DC Electrical Characteristics

Noise Characteri stics (Note 3)

Note 3: Input tr = tf = 3 ns

Supply Voltage (VCC)−0.5 V to +7.0V

DC Input Diode Current (IIK)

VI = −0.5V −20 mA

DC Input Voltage (VI)−0.5V to 7V

DC Output Diode Current (IOK)

VO = −0.5V −20 mA

VO = VCC + 0.5V +20 mA

DC Output Voltage (VO)−0.5V to VCC + 0.5V

DC Output Source

or Sink Current (IO)±25 mA

DC VCC or Ground Current (ICC or IGND)±75 mA

Storage Temperature (TSTG) −65°C to +150°C

Power Dissi pation 180 mW

Supply Voltage (VCC) 2.0V to 3.6V

Input Voltage (VI) 0V to 5.5V

Output Voltage (VO)0V to V

Operating Temperature (TA)−40°C to +85°C

Input Rise and Fall Time (∆t/∆V) 0 ns/V to 100 ns/V

Symbol Parameter VCC TA = +25°CT

A = −40°C to +85°CUnits Conditions

Min Typ Max Min Max

VIH HIGH Level 2.0 1.5 1.5

Input Voltage 3.0 2.0 2.0 V

3.6 2.4 2.4

VIL LOW Level 2.0 0.5 0.5

Input Voltage 3.0 0.8 0.8 V

3.6 0.8 0.8

VOH HIGH Level 2.0 1.9 2.0 1.9 VIN = VIL or VIH IOH = −50 µA

Output Voltage 3.0 2.9 3.0 2.9 V IOH = −50 µA

3.0 2.58 2.48 IOH = −4 mA

VOL LOW Level 2.0 0.0 0.1 0.1 VIN = VIL or VIH IOL = 50 µA

Output Voltage 3.0 0.0 0.1 0.1 V IOL = 50 µA

3.0 0.36 0.44 IOL = 4 mA

IIN Input Leakage Current 3.6 ±0.1 ±1.0 µAV

IN = 5.5V or GND

ICC Quiescent Supply Current 3.6 4.0 40.0 µAV

IN = VCC or GND

Symbol Parameter VCC TA = 25°CUnits CL (pF)

(V) Typ Limit

VOLP Quiet Output Maximum Dynamic VOL 3.3 0.3 0.5 V 50

VOLV Quiet Output Minimum Dynamic VOL 3.3 −0.3 −0.5 V 50

VIHD Minimum HIGH Level Dynamic Input Voltage 3.3 2.0 V 50

VILD Maximum LOW Level Dynamic Input Voltage 3.3 0.8 V 50

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74LVX138

AC Electrical Characteristics

Note 4: Parameter guaranteed by design. tOSLH = |tPLHm–tPLHn|, tOSHL = |tPHLm–tPHLn|

Capacitance

Note 5: CPD is defined as the v alue of the int ernal equiv alent capac it ance which is calculated f rom the operating current consum pt ion without load.

Average operating current can be obtained by the equation: CPD × VCC × IIN + ICC

Symbol Parameter VCC TA = +25°CT

A = −40°C to +85°CUnits CL (pF)

(V) Min Typ Max Min Max

tPLH Propagation 2.7 7.1 13.8 1.0 16.5

tPHL Delay Time 9.6 17.3 1 .0 20.0 50

An to On3.3 ± 0.3 5.5 8.8 1.0 10.5 15

8.0 12.3 1.0 14.0 50

tPLH Propagation 2.7 8.8 16.0 1.0 18.5

tPHL Delay Time 11.3 19.5 1.0 22.0 50

E1 or E2 to On3.3 ± 0.3 6.9 10.4 1.0 11.5 15

9.4 13.9 1.0 15.0 50

tPLH Propagation 2.7 8.7 16.3 1.0 19.5

tPHL Delay Time 11.2 19.8 1.0 23.0 50

E3 to On3.3 ± 0.3 6.8 10.6 1.0 12.5 15

9.3 14.1 1.0 16.0 50

tOSHL Output to Output 2.7 1.5 1.5 ns 50

tOSLH Skew (Note 4) 3.3 1.5 1.5

Symbol Parameter TA = +25°CT

A = −40°C to +85°CUnits

Min Typ Max Min Max

CIN Input Capacitance 4 10 10 pF

CPD Power Dissipation Capacitance (Note 5) 34 pF

5 www.fairchildsemi.com

74LVX138

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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74LVX138

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

7 www.fairchildsemi.com

74LVX138 Low Voltage 1-of-8 Decoder/Dem ultiplexer

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

16-Lea d Th in S hri n k Small Ou tlin e Pack age (TSSOP), JED EC MO-1 53, 4.4mm Wide

Package Number MTC16

Fairchild does not assume an y responsibility for use of any circuitry descr ib ed, no circuit patent licenses are implied and

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

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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

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