54LCX16374
54LCX16374 Low Voltage 16-Bit D Flip-Flop with 5V Tolerant Inputs and
Outputs
Literature Number: SNOS488A
54LCX16374
Low Voltage 16-Bit D Flip-Flop with 5V Tolerant Inputs
and Outputs
General Description
The LCX16374 contains sixteen non-inverting D flip-flops
with TRI-STATE®outputs and is intended for bus oriented
applications. The device is byte controlled. A buffered clock
(CP) and Output Enable (OE) are common to each byte and
can be shorted together for full 16-bit operation.
The LCX16374 is designed for low voltage (3.3V) V
CC
applications with capability of interfacing to a 5V signal
environment.
The LCX16374 is fabricated with an advanced CMOS
technology 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 the 54 series 16374
nESD performance:
Human body model >2000V
Machine model >200V
nStandard Microcircuit Drawing (SMD) 5962-99535
Ordering Code
Order Number Package Number Package Description
54LCX16374W-QML WA48A 48-Lead Ceramic Flatpack
Logic Symbol
Pin Descriptions
Pin Description
Names
OE
n
Output Enable Input (Active Low)
CP
n
Clock Pulse Input
I
0
–I
15
Inputs
O
0
–O
15
Outputs
Connection Diagram
TRI-STATE®is a registered trademark of National Semiconductor Corporation.
DS101199-1
Pin Assignment for
Cerpack
DS101199-2
July 1999
54LCX16374 Low Voltage 16-Bit D Flip-Flop with 5V Tolerant Inputs and Outputs
© 2001 National Semiconductor Corporation DS101199 www.national.com
Functional Description
The LCX16374 consists of sixteen edge-triggered flip-flops
with individual D-type inputs andTRI-STATE true outputs.
The device is byte controlled with each byte functioning
identically, but independent of the other. The control pins can
be shorted together to obtain full 16-bit operation. Each byte
has a buffered clock and buffered Output Enable common to
all flip-flops within that byte. The description which follows
applies to each byte. Each flip-flop will store the state of their
individual D inputs that meet the setup and hold time
requirements on the LOW-to-HIGH Clock (CP
n
) transition.
With the Output Enable (OE
n
) LOW, the contents of the
flip-flops are available at the outputs. When OE
n
is HIGH,
the outputs go to the high impedance state. Operation of the
OE
n
input does not affect the state of the flip-flops.
Inputs Outputs
CP
1
OE
1
I
0
–I
7
O
0
–O
7
LH H
LL L
LL X O
0
XH X Z
Inputs Outputs
CP
2
OE
2
I
8
–I
15
O
8
–O
15
LH H
LL L
LL X O
0
XH X Z
H = High Voltage Level
L = Low Voltage Level
X = Immaterial
Z = High Impedance
O0= Previous O0before HIGH to LOW of CP
Logic Diagrams
Byte 1 (0:7)
DS101199-3
Byte 2 (8:15)
DS101199-4
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
54LCX16374
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 ±100mA
Storage Temperature Range
(T
STG
) −65˚C to +150˚C
Power Dissapation 750mW
Junction Temperature (T
J
) 175˚C
Recommended Operating
Conditions (Note 3)
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
operated at these limits. The parametric values defined in the Electrical
Characteristics 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.
Note 3: Unused inputs must be held HIGH or LOW. They may not float.
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
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
54LCX16374
www.national.com3
AC Electrical Characteristics
Symbol Parameter T
A
= −55˚C to +125˚C, C
L
= 50pF, R
L
= 500ΩUnitsV
CC
= 3.3V ±0.3V V
CC
= 2.7V
Min Max Min Max
f
MAX
Maximum Clock Frequency 200 200 MHz
t
PHL
Propagation Delay 0.5 6.5 1.0 7.0 ns
t
PLH
CP to O
n
0.5 6.5 1.0 7.0
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 6.5 1.0 7.0 ns
t
PHZ
1.0 6.5 1.0 7.0
t
S
Setup Time 3.5 3.5 ns
t
H
Hold Time 2.0 2.0 ns
t
W
Pulse Width 4.0 4.0 ns
t
OSHL
Output to Output Skew (Note 4) 1.0 1.0 ns
t
OSLH
1.0 1.0
Note 4: Skew is defined as the absolute value of the difference between the actual propagation delay for any two seperate 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
54LCX16374
www.national.com 4
Physical Dimensions inches (millimeters) unless otherwise noted
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COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:
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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
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Tel: 1-800-272-9959
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www.national.com
48-Lead Ceramic Flatpack
Package Number WA48A
54LCX16374 Low Voltage 16-Bit D Flip-Flop 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.
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