54LCX16244
Low Voltage 16-Bit Buffer/Line Driver with 5V Tolerant
Inputs and Outputs
General Description
The LCX16244 contains sixteen non-inverting buffers with
TRI-STATE®outputs designed to be employed as a memory
and address driver, clock driver, or bus oriented transmitter/
receiver. The device is nibble controlled. Each nibble has
separate TRI-STATE control inputs which can be shorted
together for full 16-bit operation.
The LCX16244 is designed for low voltage (3.3V) V
CC
ap-
plications with capability of interfacing to a 5V signal envi-
ronment.
The LCX16244 is fabricated with an advanced CMOS tech-
nology to achieve high speed operation while maintaining
CMOS low power dissipation.
Features
n5V tolerant inputs and outputs
nPower down high impedance inputs and outputs
nSupports live insertion/withdrawal
n2.0V–3.6V V
CC
supply operation
n±24 mA output drive
nImplements patented noise/EMI reduction circuitry
nFunctionally compatible with 54 series 16244
nESD performance:
Human body model >2000V
Machine model >200V
nStandard Microcircuit Drawing (SMD) 5962-9950501
Ordering Code
Order Number Package Number Package Description
54LCX16244W-QML WA48A 48-Lead Cerpack Package
Logic Symbol Connection Diagram
TRI-STATE®is a registered trademark of National Semiconductor Corporation.
DS101059-1
Pin Assignment for
Cerpack
DS101059-2
April 1999
54LCX16244 Low Voltage 16-Bit Buffer/Line Driver with 5V Tolerant Inputs and Outputs
© 2001 National Semiconductor Corporation DS101059 www.national.com
Connection Diagram (Continued)
Pin Descriptions
Pin Names Description
OE
n
Output Enable Input (Active Low)
I
0
–I
15
Inputs
O
0
–O
15
Outputs
Functional Description
The LCX16244 contains sixteen non-inverting buffers with
TRI-STATE standard outputs. The device is nibble (4 bits)
controlled with each nibble functioning identically, but inde-
pendent of the other. The control pins can be shorted to-
gether to obtain full 16-bit operation. The TRI-STATE outputs
are controlled by an Output Enable (OE
n
) input for each
nibble. When OE
n
is LOW, the outputs are in bi-state mode.
When OE
n
is HIGH, the outputs are in the high impedance
mode, but this does not interfere with entering new data into
the inputs.
Inputs Outputs Inputs Outputs
OE
1
I
0
–I
3
O
0
–O
3
OE
2
I
4
–I
7
O
4
–O
7
LL L LL L
LH H LH H
HX Z HX Z
Inputs Outputs Inputs Outputs
OE
3
I
8
–I
11
O
8
–O
11
OE
4
I
12
–I
15
O
12
–O
15
LL L LL L
LH H LH H
HX Z HX Z
H = High Voltage Level
L = Low Voltage Level
X = Immaterial
Z = High Impedance
Logic Diagram
DS101059-3
54LCX16244
www.national.com 2
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage (V
CC
) −0.5V to +7.0V
DC Input Voltage (V
I
) −0.5V to +7.0V
DC Input Diode Current (I
IK
)
V
I
<GND −50 mA
DC Output Diode Current (I
OK
)
V
O
<GND −50mA
V
O
≥V
CC
+50mA
DC Output Voltage (V
O
) (Note 2)
Output in High or Low State -0.5V to V
CC
+ 0.5V
Output in TRI-STATE -0.5V to 7.0V
DC Output Source or Sink Current
(I
O
)±50mA
DC V
CC
or Ground Current ±400mA
Storage Temperature Range
(T
STG
) −65˚C to +150˚C
Power Dissapation 750mW
Junction Temperature (T
J
) 175˚C
Recommended Operating
Conditions (Note 2)
Supply Voltage (V
CC
)
Operating 2.0V to 3.6V
Data Retention 1.5V to 3.6V
Input Voltage (V
I
) 0V to 5.5V
Output Voltage (V
O
)
High or Low State 0V to V
CC
TRI-STATE 0V to 5.5V
Operating Temperature (T
A
) −55˚C to +125˚C
Minimum Input Edge Rate (∆t/∆V)
V
IN
from 0.8V to 2.0V, V
CC
= 3.0V 0ns/V to 10ns/V
Note 1: The Absolute Maximum Ratings are those values beyond which the
safety of the device cannot be guaranteed. The device should not be oper-
ated at these limits. The parametric values defined in the Electrical Charac-
teristics tables are not guaranteed at the Absolute Maximum Ratings. The
“Recommended Operating Conditions” table will define the conditions for
actual device operation.
Note 2: IOAbsolute Maximum Rating must be observed.
DC Electrical Characteristics
Symbol Parameter Conditions V
CC
T
A
= −55˚C to +125˚C Units
(V) Min Max
V
IH
HIGH Level Input Voltage 2.7–3.6 2.0 V
V
IL
LOW Level Input Voltage 2.7–3.6 0.8 V
V
OH
HIGH Level Output Voltage I
OH
= −100 µA 2.7–3.6 V
CC
− 0.2 V
I
OH
= −12 mA 2.7 2.2 V
I
OH
= −12 mA 3.0 2.4 V
I
OH
= −24 mA 3.0 2.2 V
V
OL
LOW Level Output Voltage I
OL
= 100 µA 2.7–3.6 0.2 V
I
OL
= 12 mA 2.7 0.4 V
I
OL
= 24 mA 3.0 0.55 V
V
IC
Negative Input Clamp
Voltage I
IN
= -18mA 3.0 -1.2 V
I
I
Input Leakage Current 0 ≤V
I
≤5.5V 2.7–3.6 ±5.0 µA
I
OZ
3-STATE Output Leakage 0 ≤V
O
≤5.5V 2.7–3.6 ±5.0 µA
V
I
=V
IH
or V
IL
I
OFF
Power-Off Leakage Current V
I
or V
O
= 5.5V 0 10 µA
I
CC
Quiescent Supply Current V
I
=V
CC
or GND 2.7–3.6 20 µA
3.6V ≤V
I
,V
O
≤5.5V 2.7–3.6 ±20 µA
∆I
CC
Increase in I
CC
per Input V
IH
=V
CC
−0.6V 2.7–3.6 500 µA
54LCX16244
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AC Electrical Characteristics
Symbol Parameter T
A
= −55˚C to +125˚C, C
L
= 50pF, R
L
= 500 ΩUnits
V
CC
= 3.3V ±0.3V V
CC
= 2.7V
Min Max Min Max
t
PHL
Propagation Delay 0.5 5.5 1.0 6.0 ns
t
PLH
Data to Output 0.5 5.5 1.0 6.0
t
PZL
Output Enable Time 0.5 6.5 1.0 7.0 ns
t
PZH
0.5 6.5 1.0 7.0
t
PLZ
Output Disable Time 1.0 6.0 1.0 6.0 ns
t
PHZ
1.0 6.0 1.0 6.0
t
OSHL
Output to Output Skew (Note 3) 1.0 1.0 ns
t
OSLH
Note 3: Skew is defined as the absolute value of the difference between the actual propagation delay for any two separate outputs of the same device. The
specification applies to any outputs switching in the same direction, either HIGH to LOW (tOSHL) or LOW to HIGH (tOSLH). Parameter guaranteed by design.
Dynamic Switching Characteristics
Symbol Parameter Conditions V
CC
(V) T
A
= 25˚C Units
Max
V
OLP
Quiet Output Dynamic Peak V
OL
C
L
= 50 pF, V
IH
= 3.3V, V
IL
= 0V 3.3 1.2 V
V
OLV
Quiet Output Dynamic Valley V
OL
C
L
= 50 pF, V
IH
= 3.3V, V
IL
= 0V 3.3 -1.1 V
Capacitance
Symbol Parameter Conditions Max Units
C
IN
Input Capacitance V
CC
= Open, V
I
=0VorV
CC
10 pF
C
OUT
Output Capacitance V
CC
= 3.3V, V
I
=0VorV
CC
12 pF
C
PD
Power Dissipation Capacitance V
CC
= 3.3V, V
I
=0VorV
CC
, f = 10 MHz 40 pF
54LCX16244
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Physical Dimensions inches (millimeters) unless otherwise noted
LIFE SUPPORT POLICY
NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL
COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or
systems which, (a) are intended for surgical implant
into the body, or (b) support or sustain life, and
whose failure to perform when properly used in
accordance with instructions for use provided in the
labeling, can be reasonably expected to result in a
significant injury to the user.
2. A critical component is any component of a life
support device or system whose failure to perform
can be reasonably expected to cause the failure of
the life support device or system, or to affect its
safety or effectiveness.
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www.national.com
48-Lead Cerpack
Package Number WA48A
54LCX16244 Low Voltage 16-Bit Buffer/Line Driver with 5V Tolerant Inputs and Outputs
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.