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74LCXZ16244 Low Voltage 16-Bit Buffer/Line Driver with 5V Tolerant Inputs and Outputs
September 2000
Revised August 2001
74LCXZ16244
Low Voltage 16-Bit Buffer/Line Driver
with 5V Tolerant Inputs and Outputs
General Description
The LCXZ16244 contains sixteen non-inverting buffers
with 3-STATE outputs designed to be employed as a mem-
ory and address driver, clock driver, or bus oriented trans-
mitter/receiver. The device is nibble controlled. Each nibble
has separate 3-STATE control inputs which can be shorted
together for full 16-bit operation.
When V
CC
is between 0 and 1.5V, the LCXZ12644 is in the
high impedance state during power up or power down. This
places the outputs in high impedance (Z) state preventing
intermittent low impedance loading or glitching in bus ori-
ented applications.
The LCXZ16244 is designed for low voltage (2.7V or 3.3V)
V
CC
applications with capability of interfacing to a 5V signal
environment.
The LCXZ16244 is fabricated with an advanced CMOS
technology to achieve high speed operation while maintain-
ing CMOS low power dissipation.
Features
I
5V tolerant inputs and outputs
I
Guaranteed power up/down high impedance
I
Supports live insertion/withdrawal
I
2.7V–3.6V V
CC
specifications provided
I
4.5 ns t
PD
max (V
CC
=
3.0V), 20
µ
A I
CC
max
I
±
24 mA output drive (V
CC
=
3.0V)
I
Implements patented noise/EMI reduction circuitry
I
Latch-up performance exceeds 500 mA
I
ESD performance:
Human body model
>
2000V
Machine model
>
200V
I
Also packaged in plastic Fine-Pitch Ball Grid Array
The LCXZ16244 contains sixteen non-inverting buffers
with 3-STATE standard outputs. The device is nibble
(4 bits) controlled with each nibble functioning identically,
but independent of the other. The control pins can be
shorted together to obtain full 16-bit operation. The
3-STATE outputs are controlled by an Output Enable (OE
n
)
input for each nibble. When OE
n
is LOW, the outputs are in
2-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.
Logic Diagram
3
www.fairchildsemi.com
74LCXZ16244
Absolute Maximum Ratings
(Note 3)
Symbol
V
CC
V
I
V
O
I
IK
I
OK
I
O
I
CC
I
GND
T
STG
Parameter
Supply Voltage
DC Input Voltage
DC Output Voltage
DC Input Diode Current
DC Output Diode Current
DC Output Source/Sink Current
DC Supply Current per Supply Pin
DC Ground Current per Ground Pin
Storage Temperature
Value
Conditions
Units
V
V
Output in 3-STATE or V
CC
=
0–1.5V
Output in HIGH or LOW State (Note 4)
V
I
<
GND
V
O
<
GND
V
O
>
V
CC
V
mA
mA
mA
mA
mA
−
0.5 to
+
7.0
−
0.5 to
+
7.0
−
0.5 to
+
7.0
−
0.5 to V
CC
+
0.5
−
50
−
50
+
50
±
50
±
100
±
100
−
65 to
+
150
°
C
Recommended Operating Conditions
(Note 5)
Symbol
V
CC
V
I
V
O
I
OH
/I
OL
T
A
Supply Voltage
Input Voltage
Output Voltage
Output Current
Free-Air Operating Temperature
Input Edge Rate, V
IN
=
0.8V–2.0V, V
CC
=
3.0V
HIGH or LOW State
3-STATE or V
CC
=
OFF
V
CC
=
3.0V
−
3.6V
V
CC
=
2.7V
−
3.0V
Parameter
Operating
Min
2.7
0
0
0
Max
3.6
5.5
V
CC
5.5
Units
V
V
V
mA
±
24
±
12
−
40
0
85
10
°
C
ns/V
∆
t/
∆
V
Note 3:
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 “Recom-
mended Operating Conditions” table will define the conditions for actual device operation.
Note 4:
I
O
Absolute Maximum Rating must be observed.
Note 5:
Unused inputs must be held HIGH or LOW. They may not float.
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