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74LCXH16374 Low Voltage 16-Bit D-Type Flip-Flop with Bushold
February 2001
Revised June 2005
74LCXH16374
Low Voltage 16-Bit D-Type Flip-Flop with Bushold
General Description
The LCXH16374 contains sixteen non-inverting D-type flip-
flops with 3-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 LCXH16374 is designed for low voltage (2.5V or 3.3V)
V
CC
applications.
The LCXH16374 is fabricated with an advanced CMOS
technology to achieve high speed operation while maintain-
ing CMOS low power dissipation.
The LCXH16374 data inputs include active bushold cir-
cuitry, eliminating the need for external pull-up resistors to
hold unused or floating data inputs at a valid logic level.
Features
s
5V tolerant control inputs and outputs
s
2.3V–3.6V V
CC
specifications provided
s
6.2 ns t
PD
max (V
CC
3.3V), 20
P
A I
CC
max
s
Bushold on inputs eliminating the need for external
flip-flops with individual D-type inputs and 3-STATE true
outputs. The device is byte controlled with each byte func-
tioning 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 con-
tents 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.
Logic Diagrams
Byte 1 (0:7)
Byte 2 (8:15)
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
3
www.fairchildsemi.com
74LCXH16374
Absolute Maximum Ratings
(Note 3)
Symbol
V
CC
V
I
V
O
I
IK
I
OK
I
O
I
CC
I
GND
T
STG
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
I
0
- I
15
OE
1
, CP
n
Parameter
Value
Conditions
Units
V
V
3-STATE
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 V
CC
0.5
0.5V to 7.0V
0.5 to
7.0
0.5 to V
CC
0.5
50
50
50
r
50
r
100
r
100
65 to
150
q
C
Recommended Operating Conditions
(Note 5)
Symbol
V
CC
V
I
V
O
I
OH
/I
OL
Supply Voltage
Input Voltage
Output Voltage
Output Current
HIGH or LOW State
3-STATE
V
CC
V
CC
V
CC
T
A
Free-Air Operating Temperature
Input Edge Rate, V
IN
0.8V–2.0V, V
CC
3.0V
3.0V
3.6V
2.7V
3.0V
2.3V
2.7V
Parameter
Operating
Data Retention
Min
2.0
1.5
0
0
0
Max
3.6
3.6
V
CC
V
CC
5.5
Units
V
V
V
r
24
r
12
r
8
40
0
85
10
mA
q
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:
Floating or unused control inputs must be HIGH or LOW.
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