Fairchild Semiconductor 74LCX244WMX, 74LCX244WM, 74LCX244SJX, 74LCX244SJ, 74LCX244MTCX Datasheet

February 1994
Revised April 1999

74LCX244 Low Voltage Buffer/Line Driver with 5V Tolerant Inputs and Outputs

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74LCX244
Low Voltage Buffer/Line Driver with 5V Tolerant

Inputs and Outputs

General Description

The LCX244 con tains eight non-inverting buffers with 3­STATE outputs. The device may be employed as a mem­ory address driver, clock driver and bus-oriented transm it­ter/receiver. The LCX244 is designed for low voltage (2.5V
or 3.3V) V

CC

applications with capability of interfacing to a
5V signal environment.
The LCX244 is fabrica ted with an advanced CMOS tech-

nology to achieve high spee d operation while mai ntaining
CMOS low power dissipation.

Features

■ 5V tolerant inputs and outputs

■ 2.3V–3.6V V

CC

specifications provided

■ 6.5 ns t

PD

max (VCC = 3.3V), 10 µA ICC max

■ Power down high impedance inputs and outputs

■ Supports live insertion/withdrawal (Note 1)

■ ±24 mA output drive (V

CC

= 3.0V)

■ Implements patented noise/EMI reduction circuitry

■ Latch-up performance exceeds 500 mA

■ ESD performance:

Human body model > 2000V
Machine model > 200V

Note 1: To ensure the high-impedan c e state during power up or down, OE
should be tied to VCC through a pull-up res istor: the m inimu m value or t he

resistor is determin ed by the current-sourcing capability of the driver.

Ordering Code:

Devices also availab le in Tape and Reel. Specify by appending th e s uffix let t er “X” to the ordering cod e.

Logic Symbol

IEEE/IEC

Connection Diagram

Order Number Package Number Package Description

74LCX244WM M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300” Wide
74LCX244SJ M20D 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 4.4mm Wide
74LCX244MSA MSA20 20-Lead Shrink Small Outline Package (SSOP), EIAJ TYPE II, 5.3mm Wide
74LCX244MTC MTC20 20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide

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74LCX244

Pin Descriptions

Truth Tables

H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
Z = High Impedance

Pin Names Description

OE

1

, OE

2

3-STATE Output Enable Inputs

I

0–I7

Inputs

O

0–O7

Outputs

Inputs Outputs

OE

1

I

n

(Pins 12, 14, 16, 18)

LL L
LH H
HX Z

Inputs Outputs

OE

2

I

n

(Pins 3, 5, 7, 9)

LL L
LH H
HX Z

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74LCX244

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 operated

at these limits. The parametric values defined in the Electrical Characteristics tables are not guaranteed at the Absolute Maximum Ratings. The “Recom­mended Operating C onditions” table will def ine the conditions for ac t ual device operation.

Note 3: I

O

Absolute Maximum Rating must be observed.

Note 4: Unused inputs or I/Os must be held HIGH or LOW. They may not float.

DC Electrical Characteristics

Symbol Parameter Value Conditions Units

V

CC

Supply Voltage −0.5 to +7.0 V

V

I

DC Input Voltage −0.5 to +7.0 V

V

O

DC Output Voltage −0.5 to +7.0 Output in 3-STATE

V

−0.5 to V

CC

+ 0.5 Output in HIGH or LOW State (Note 3)

I

IK

DC Input Diode Current −50 VI < GND mA

I

OK

DC Output Diode Current −50 VO < GND

mA

+50 V

O

> V

CC

I

O

DC Output Source/Sink Current ±50 mA

I

CC

DC Supply Current per Supply Pin ±100 mA

I

GND

DC Ground Current per Ground Pin ±100 mA

T

STG

Storage Temperature −65 to +150 °C

Symbol Parameter Min Max Units

V

CC

Supply Voltage Operating 2.0 3.6

V

Data Retention 1.5 3.6

V

I

Input Voltage 0 5.5 V

V

O

Output Voltage HIGH or LOW State 0 V

CC

V

3-STATE 0 5.5

I

OH/IOL

Output Current VCC = 3.0V–3.6V ±24

mAV

CC

= 2.7V–3.0V ±12

V

CC

= 2.3V–2.7V ±8

T

A

Free-Air Operating Temperature −40 85 °C

∆t/∆V Input Edge Rate, V

IN

= 0.8V–2.0V, VCC = 3.0V 0 10 ns/V

Symbol Parameter Conditions

V

CC

TA = −40°C to +85°C

Units

(V) Min Max

V

IH

HIGH Level Input Voltage 2.3 − 2.7 1.7

V

2.7 − 3.6 2.0

V

IL

LOW Level Input Voltage 2.3 − 2.7 0.7

V

2.7 − 3.6 0.8

V

OH

HIGH Level Output Voltage IOH = −100 µA2.3 − 3.6 VCC − 0.2

V

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

V

OL

LOW Level Output Voltage IOL = 100 µA2.3 − 3.6 0.2

V

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

I

I

Input Leakage Current 0 ≤ VI ≤ 5.5V 2.3 − 3.6 ±5.0 µA

I

OZ

3-STATE Output Leakage 0 ≤ VO ≤ 5.5V 2.3 − 3.6 ±5.0

µA

VI = VIH or V

IL

I

OFF

Power-Off Leakage Current VI or VO = 5.5V 0 10 µA