Fairchild 74LVX244 service manual
74LVX244
Low Voltage Octal Buffer/ Line Driver with
3-STATE Outputs
74LVX244 Low Voltage Octal Buffer/Line Driver with 3-STATE Outputs
February 1993
Revised April 2005
General Description
The LVX244 is an octal non-inverting buffer and line driv er
designed to be employed as a memory address driver,
clock driver and bus or iented tra nsmitter or receive r which
provides improved PC board density. The inputs tolerate up
to 7V allowing interface of 5V systems to 3V systems.
Features
■ Input voltage translation from 5V to 3V
■ Ideal for low power/low noise 3.3V applications
■ Guaranteed simultaneous switching noise level and
dynamic threshold performan ce
Ordering Code:
Order Number Package Number Package Description
74LVX244M M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide
74LVX244SJ M20D Pb-Free 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
74LVX244MTC MTC20 20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
Devices also availab l e in Tape and Reel. Specify by appending suffix lette r “X” to the ordering code.
Pb-Free package per JEDEC J-STD-020B.
Logic Symbol
IEEE/IEC
Pin Descriptions
Pin Names Description
OE
I
0–I7
O
1
0–O7
, OE
3-STATE Output Enable Inputs
2
Inputs
Outputs
Truth Ta bles
Inputs Outputs
I
n
(Pins 12, 14, 16, 18)
Connection Diagram
OE
1
LL L
LH H
HX Z
Inputs Outputs
OE
2
LL L
LH H
HX Z
H HIGH Voltage Level L LOW Voltage Level
Immaterial Z High Impedance
X
© 2005 Fairchild Semiconductor Corporation DS011552 www.fairchildsemi.com
I
n
(Pins 3, 5, 7, 9)
Absolute Maximum Ratings(Note 1) Recommended Operating
Supply Voltage (VCC)
DC Input Diode Current (I
74LVX244
V
0.5V
I
DC Input Voltage (V
DC Output Diode Current (I
V
0.5V
O
VCC 0.5V
V
O
DC Output Voltage (V
)
IK
)
I
)
OK
)
O
0.5V to 7.0V
0.5V to VCC 0.5V
DC Output Source
or Sink Current (I
or Ground Current
DC V
CC
(I
or I
CC
GND
Storage Temperature (T
)
O
)
STG
)
65q
C to 150qC
Power Dissipation 180 mW
20 mA
0.5V to 7V
20 mA
20 mA
r
25 mA
r
75 mA
Conditions
Supply Voltage (V
Input Voltage (V
Output Voltage ( V
Operating Temperature (TA)
Input Rise and Fall Time (
Note 1: The “Absolute Maximum Ratings” are those values bey ond which
the safety of the d evice cannot be guaranteed. The device sh ould not be
operated at these limi ts. The parametric values define d in the Electrical
Characteristics tables are not guaranteed at the absolute maximum ratings.
The “Recomme nded O peratin g Cond itions ” table w ill def ine th e cond itions
for actual device operation.
Note 2: Unused inputs mus t be held HIGH or LOW. They may not float.
(Note 2)
) 2.0V to 3.6V
CC
)0V to 5.5V
I
) 0V to V
o
't/'
V) 0 ns/V to 100 ns/V
DC Electrical Characteristics
Symbol Parameter
V
HIGH Level Input 2.0 1.5 1.5
IH
Voltage 3.0 2.0 2.0 V
V
LOW Level Input 2.0 0.5 0.5
IL
Voltage 3.0 0.8 0.8 V
V
HIGH Level Output 2.0 1.9 2.0 1.9 VIN VIH or VILIOH 50 PA
OH
Voltage 3.0 2.9 3.0 2.9 V IOH 50 PA
V
LOW Level Output 2.0 0.0 0.1 0.1 VIN VIH or VILIOL 50 PA
OL
Voltage 3.0 0.0 0.1 0.1 V IOL 50 PA
3-STATE Output 3.6
I
OZ
Off-State Current V
I
Input Leakage Current 3.6
IN
Quiescent Supply Current 3.6 4.0 40.0
I
CC
V
CC
3.6 2.4 2.4
3.6 0.8 0.8
3.0 2.58 2.48 IOH 4 mA
3.0 0.36 0.44 I
TA 25qCT
Min Typ Max Min Max
r
0.25
r
0.1
40qC to 85qC
A
r
2.5
r
1.0
Units Conditions
P
AVIN VIH or V
P
AVIN 5.5V or GND
P
AVIN VCC or GND
40q
VCC or GND
OUT
C to 85qC
4 mA
OL
IL
CC
Noise Characteristics
Symbol Parameter
V
Quiet Output Maximum Dynamic V
OLP
V
Quiet Output Minimum Dynamic V
OLV
V
Minimum HIGH Level Dynamic Input Voltage 3.3 2.0 V 50
IHD
V
Maximum LOW Level Dynamic Input Voltage 3.3 0.8 V 50
ILD
Note 3: Input tr tf 3 ns
(Note 3)
OL
OL
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V
CC
(V) Typ Limit
3.3 0.5 0.8 V 50
3.3
TA 25qC
0.5
Units
0.8 V 50
CL (pF)
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