74LCX241MTC - Fairchild Semiconductor

August 1998

Revised March 2005

74LCX241 Low Voltage Octal Buffer/Line Driver with 5V Tolerant Inputs and Outputs

74LCX241

Low Voltage Octal Buffer/Line Driver with

5V Tolerant Inputs and Outputs

General Descript ion

The LCX2 41 is an octal buffer and line driver designed to

be employed as a m em ory add re ss dr i ver, clock driver a nd

bus oriented transmitter or receiver. The device is designed

for low v oltage (2.5V or 3.3V) VCC ap plications with capa-

bility of interfacing to a 5V signal environment.

The LCX241 is fabricated with an advanced CMOS tech-

nology to achieve high speed operation while maintaining

CMOS low power dissipation.

Features

■5V tolerant inputs and outputs

■2.3V – 3.6V VCC specifications provided

■6.5 ns tPD max (VCC

3.3V), 10

A ICC max

■Power-down high impedance inputs and outputs

■Supports live insertion/withdrawal (Note 1)

■Implements patented noise/EMI reduction circuitry

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

■ESD performa nce :

Human Body Model

2000V

Machine Model

200V

Note 1: To ensure the high-impedance state during power up or down, OE

should be tied to VCC and OE should be ti ed to GND through a resistor: t he

minimum value or the re sistor is de termin ed by the c urrent -sourcin g capa-

bility of the driver.

Ordering Code:

Devices also available in Tape and Ree l. Specify by append ing the suffix let t er “X” to th e ordering co de.

Pb-Free package per JEDEC J-STD-020B.

Connection Diagram Pin Descriptions

Order Number Package Number Package Description

74LCX241WM M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide

74LCX241SJ M20D Pb-Free 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide

74LCX241MSA MSA20 20-Lead Shrink Small Outline Package (SSOP), JEDEC MO-150, 5.3mm Wide

74LCX241MTC MTC20 20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide

Pin Names Description

OE1, OE23-STATE Output Enable Inputs

I0–I7Inputs

O0–O7Outputs

www.fairchildsemi.com 2

74LCX241

Logic Symbol

Truth Tables

HIGH Voltage Level

LOW Volt age Level

Immaterial

High Impeda nc e

Inputs Outputs

(Pins 12, 14, 16, 18)

OE1In

LL L

LH H

HX Z

Inputs Outputs

(Pins 3, 5, 7, 9)

OE2In

HH H

HL L

LX Z

3 www.fairchildsemi.com

74LCX241

Absolute Maximum Ratings(Note 2)

Recommended Operating Conditions (Note 4)

Note 2: The Absolute Maximum Ratings are those values beyond which the safety of the device cannot be guaranteed. The device should not be operat ed

at these limits. The para metric value s defined in the Elec trical Cha racteristic s tables are n ot guarantee d at the A bsolute Ma ximum R atings . The “Recom-

mended Operating Conditions” table will def ine the con dit ions for act ual dev ic e operation.

Note 3: IO Absolu te Maximu m Rating must be observed.

Note 4: Unused input s m ust be he ld H I GH or LOW. They may not f loat.

DC Electrical Characteristics

Symbol Parameter Value Conditions Units

VCC Supply Voltage



0.5 to



7.0 V

VIDC Input Voltage



0.5 to



7.0 V

VODC Output Volta ge



0.5 to



7.0 Output in 3-STATE V



0.5 to VCC



0.5 Output in HIGH or LOW State (Note 3)

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

Symbol Parameter Min Max Units

VCC Supply Vo ltage Operati ng 2.0 3.6 V

Data Retention 1.5 3.6

VIInput Voltage 0 5.5 V

VOOutput Voltage HIGH or LOW State 0 VCC V

3-STATE 0 5.5

IOH/IOL Output Current VCC

3.0V



3.6V

24 mAVCC

2.7V



3.0V

VCC

2.3V



2.7V

TAFree-Air Operating Temperature



40 85

V Input Edge Rate, VIN

0.8V



2.0V, VCC

3.0V 0 10 ns/V

Symbol Parameter Conditions VCC TA



C to



CUnits

(V) Min Max

VIH HIGH Level Input Voltage 2.3



2.7 1.7 V

2.7



3.6 2.0

VIL LOW Level Input Voltage 2.3



2.7 0.7 V

2.7



3.6 0.8

VOH HIGH Level Output Voltage IOH



100

A2.3



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

A2.3



3.6 0.2

IOL

8 mA 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

5.5V 2.3 - 3.6

5.0

IOZ 3-STATE Output Leakage 0

5.5V 2.3 - 3.6

5.0

VIH or VIL

IOFF Power-Off Leakage Current VI or VO

5.5V 0 10

www.fairchildsemi.com 4

74LCX241

DC Electrical Characteristics (Continued)

Note 5: Outputs disabled or 3-STATE only.

AC Electrical Characteristics

Note 6: Skew is de fi ned as th e absolut e valu e of the difference betwee n t he ac tu al propaga t ion delay f or any t w o separa t e outputs of t he same device. The

specif ic ation ap plies to an y o ut puts switch ing in the same direc t ion, either HIGH-to- LOW (tOSHL) or LO W-to-HIGH (t OSLH).

Dynamic Switching Characteristics

Capacitance

Symbol Parameter Conditions VCC TA



C to



CUnits

(V) Min Max

ICC Quiescent Supply Current VI

VCC or GND 2.3 - 3.6 10

3.6V

VI, VO

5.5V (Note 5) 2.3 - 3.6

ICC Increase in ICC per Input VIH

VCC



0.6v 2.3 - 3.6 500

Symbol Parameter



C to



C, RL

500

Units

VCC

3.3V

0.3V VCC

2.7V VCC

2.5V

0.2V

50 pF CL

30 pF

Min Max Min Max Min Max

tPHL Propagation Delay 1.5 6.5 1.5 7.5 1.5 7.8 ns

tPLH Data to Output 1.5 6.5 1.5 7.5 1.5 7.8

tPZL Output Enable Time 1.5 8.0 1.5 9.0 1.5 10.0 ns

tPZH 1.5 8.0 1.5 9.0 1.5 10.0

tPLZ Output Disable Time 1.5 7.0 1.5 8.0 1.5 8.4 ns

tPHZ 1.5 7.0 1.5 8.0 1.5 8.4

tOSHL Output to Output Skew (Note 6) 1.0 ns

tOSLH 1.0

Symbol Parameter Conditions VCC TA

CUnits

(V) Typical

VOLP Quiet Output Dynamic Peak VOL CL

50 pF, VIL

3.3V, VIL

0V 3.3 0.8 V

30 pF, VIH

2.5V, VIL

0V 2.5 0.6

VOLV Quiet Output Dynamic Valley VOL CL

50 pF, VIL

3.3V, VIL

0V 3.3



0.8 V

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 7pF

COUT Output Capacitance VCC

3.3V, VI

0V or VCC 8pF

CPD Power Dissipation Capacitance VCC

3.3V, VI

0V or VCC, f

10 MHz 25 pF

5 www.fairchildsemi.com

74LCX241

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

Propagation Delay. Pulse Width and trec Waveforms

3-STATE Output Low Enable and

Disable Times for L o gic

3-STATE Output High Enable and

Disable Times for Logic

Setup Time, Hold Time and Recovery Time for Logic

trise and tfall

FIGURE 2. Waveform s

(Input Characteristics; f = 1MHz, tR = tF = 3ns)

Test Switch

tPLH, tPHL Open

tPZL, tPLZ 6V at VCC

3.3

0.3V

VCC x 2 at VCC

2.5

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

www.fairchildsemi.com 6

74LCX241

Schematic Diagram Generic for LCX Family

7 www.fairchildsemi.com

74LCX241

Physical Dimensions inches (millimeters) unless otherwise noted

20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide

Package Number M20B

www.fairchildsemi.com 8

74LCX241

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

Pb-Free 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide

Package Number M20D

9 www.fairchildsemi.com

74LCX241

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

20-Lead Shrink Small Outline Package (SSOP), JEDEC MO-150, 5.3mm Wide

Package Number MSA20

www.fairchildsemi.com 10

74LCX241 Low Voltage Octal Buffer/Line Driver with 5V Tolerant Inputs and Outputs

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

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

Package Number MTC20

Fairchild does no t assume any responsibility for use of any circui try described, no circuit patent licenses are implied and

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

LIFE SUPPORT POLI CY

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 systems a re devices or syste ms

which, (a) are intended for surgical implant into the

body, or (b) support or sustain life, and (c) whose failure

to perform when properly used in accordance with

instructions for use provided in the labeling, can be rea-

sonably expected to result in a significant injury to the

user.

2. A critical compon ent in any componen t of a life support

device or system whose failure to perform can be rea-

sonabl y ex pect ed to cause the fa ilu re of the li fe su pp ort

device or system, or to affect its safety or effectiveness.