74LCX374 Low Voltage Octal D-Type Flip-Flop with 5V Tolerant Inputs and Outputs
February 2006
74LCX374
Low Voltage Octal D-Type Flip-Flop
with 5V Tolerant Inputs and Outputs
Features
■
5V tolerant inputs and outputs
■
2.3V–3.6V V
CC
specifications provided
■
8.5ns t
PD
max (V
CC
=
3.3V), 10
µ
A I
CC
max
■
Power-down high impedance inputs and outputs
■
Supports live insertion/withdrawal
1
■
±
24mA output drive (V
CC
=
3.0V)
■
Implements patented noise/EMI reduction circuitry
■
Latch-up performance exceeds JEDEC 78 conditions
■
ESD performance
General Description
The LCX374 consists of eight D-type flip-flops featuring
separate D-type inputs for each flip-flop and 3-STATE
outputs for bus-oriented applications. A buffered clock
(CP) and Output Enable (OE) are common to all flip-
flops. The LCX374 is designed for low voltage appli-
cations with capability of interfacing to a 5V signal
environment.
The LCX374 is fabricated with an advanced CMOS tech-
nology to achieve high speed operation while maintain-
ing CMOS low power dissipation.
– Human Body Model
>
2000V
– Machine Model
>
200V
■
Leadless Pb-Free DQFN package
Ordering Information
Order Number
74LCX374WM
74LCX374SJ
74LCX374BQX
2
74LCX374MSA
74LCX374MTC
74LCX374MTCX_NL
3
Package
Number
M20B
M20D
MLP020B
MSA20
MTC20
MTC20
Package Description
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300"
Wide
20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
Pb-Free 20-Terminal Depopulated Quad Very-Thin Flat Pack No Leads
(DQFN), JEDEC MO-241, 2.5 x 4.5mm
20-Lead Shrink Small Outline Package (SSOP), JEDEC MO-150, 5.3mm
Wide
20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153,
4.4mm Wide
Pb-Free 20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC
MO-153, 4.4mm Wide
Devices also available in Tape and Reel. Specify by appending suffix letter “X” to the ordering code.
Pb-Free package per JEDEC J-STD-020B.
Notes:
1.
To ensure the high impedance state during power up or down, OE should be tied to V
CC
through a pull-up resistor: the minimum
value of the resistor is determined by the current-sourcing capability of the driver.
2.
DQFN package available in Tape and Reel only.
3.
“_NL” indicates Pb-Free package (per JEDEC J-STD-020B). Device available in Tape and Reel only.
©2006 Fairchild Semiconductor Corporation
1
www.fairchildsemi.com
74LCX374 Rev. 2.0.0
74LCX374 Low Voltage Octal D-Type Flip-Flop with 5V Tolerant Inputs and Outputs
Logic Symbol
D
0
D
1
D
2
D
3
D
4
D
5
D
6
D
7
CP
OE
O
0
O
1
O
2
O
3
O
4
O
5
O
6
O
7
Pin Descriptions
Pin Names
D
0
–D
7
CP
OE
O
0
–O
7
Description
Data Inputs
Clock Pulse Input
Output Enable Input
3-STATE Outputs
Connection Diagrams
Pin Assignments for
SOIC, SOP, SSOP, TSSOP
Truth Table
Inputs
D
n
CP
OE
L
L
L
X
L
H
H
L
X
X
Outputs
O
n
H
L
O
0
Z
OE
O
0
D
0
D
1
O
1
O
2
D
2
D
3
O
3
GND
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
V
CC
O
7
D
7
D
6
O
6
O
5
D
5
D
4
O
4
CP
H
=
HIGH Voltage Level
L
=
LOW Voltage Level
X
=
Immaterial
Z
=
High Impedance
=
LOW-to-HIGH Transition
O
0
=
Previous O
0
before HIGH-to-LOW of CP
Pad Assignments for DQFN
OE V
CC
1
20
19
O
7
18
D
7
17
D
6
16
O
6
15
O
5
14
D
5
13
D
4
12
O
4
10
11
Functional Description
The LCX374 consists of eight edge-triggered flip-flops
with individual D-type inputs and 3-STATE true outputs.
The buffered clock and buffered Output Enable are com-
mon to all flip-flops. The eight flip-flops will store the state
of their individual D inputs that meet the setup and hold
time requirements on the LOW-to-HIGH Clock (CP) tran-
sition. With the Output Enable (OE) LOW, the contents of
the eight flip-flops are available at the outputs. When the
OE is HIGH, the outputs go to the high impedance state.
Operation of the OE input does not affect the state of the
flip-flops.
O
0
2
D
0
3
D
1
4
O
1
5
O
2
6
D
2
7
D
3
8
O
3
9
GND CP
(Top View)
Logic Diagram
D
0
CP
CP
O
D
CP
O
D
CP
O
D
CP
O
D
CP
O
D
CP
O
D
CP
O
D
CP
O
D
D
1
D
2
D
3
D
4
D
5
D
6
D
7
OE
O
0
O
1
O
2
O
3
O
4
O
5
O
6
O
7
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
2
74LCX374 Rev. 2.0.0
www.fairchildsemi.com
74LCX374 Low Voltage Octal D-Type Flip-Flop with 5V Tolerant Inputs and Outputs
Absolute Maximum Ratings
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.
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
Conditions
Value
−
0.5 to
+
7.0
−
0.5 to
+
7.0
Units
V
V
V
mA
mA
mA
mA
mA
°
C
Output in 3-STATE
Output in HIGH or LOW State
4
V
I
<
GND
V
O
<
GND
V
O
>
V
CC
−
0.5 to
+
7.0
−
0.5 to V
CC
+
0.5
−
50
−
50
+
50
±
50
±
100
±
100
−
65 to
+
150
Recommended Operating Conditions
5
Symbol
V
CC
V
I
V
O
I
OH
/ I
OL
Parameter
Supply Voltage
Input Voltage
Output Voltage
Output Current
Operating
Conditions
Data Retention
HIGH or LOW State
3-STATE
V
CC
=
3.0V
−
3.6V
V
CC
=
2.7V
−
3.0V
V
CC
=
2.3V
−
2.7V
Min.
2.0
1.5
0
0
0
Max.
3.6
3.6
5.5
V
CC
5.5
±
24
±
12
±
8
Units
V
V
V
mA
T
A
∆
t /
∆
V
Free-Air Operating Temperature
Input Edge Rate
V
IN
=
0.8V
−
2.0V, V
CC
=
3.0V
−
40
0
85
10
°
C
ns / V
Notes:
4. I
O
Absolute Maximum Rating must be observed.
5. Unused inputs or I/Os must be held HIGH or LOW. They may not float.
3
74LCX374 Rev. 2.0.0
www.fairchildsemi.com
74LCX374 Low Voltage Octal D-Type Flip-Flop with 5V Tolerant Inputs and Outputs
DC Electrical Characteristics
T
A
= −40°C
to
+85°C
Symbol
V
IH
V
IL
V
OH
Parameter
HIGH Level Input Voltage
LOW Level Input Voltage
HIGH Level Output
Voltage
Conditions
V
CC
(V)
2.3
−
2.7
2.7
−
3.6
2.3
−
2.7
2.7
−
3.6
Min.
1.7
2.0
Max.
Units
V
0.7
0.8
V
CC
−
0.2
1.8
2.2
2.4
2.2
0.2
0.6
0.4
0.4
0.55
±5.0
±5.0
10
10
±10
500
V
V
I
OH
= −100µA
I
OH
= −8mA
I
OH
= −12mA
I
OH
= −18mA
I
OH
= −24mA
2.3
−
3.6
2.3
2.7
3.0
3.0
2.3
−
3.6
2.3
2.7
3.0
3.0
2.3
−
3.6
2.3
−
3.6
0
2.3
−
3.6
2.3
−
3.6
2.3
−
3.6
V
OL
LOW Level Output
Voltage
I
OL
=
100µA
I
OL
=
8mA
I
OL
=
12mA
I
OL
=
16mA
I
OL
=
24mA
V
I
I
I
OZ
I
OFF
I
CC
∆I
CC
Input Leakage Current
3-STATE Output Leakage
Power-Off Leakage Current
Quiescent Supply Current
Increase in I
CC
per Input
0
≤
V
I
≤
5.5V
0
≤
V
O
≤
5.5V,
V
I
=
V
IH
or V
IL
V
I
or V
O
=
5.5V
V
I
=
V
CC
or GND
3.6V
≤
V
I
, V
O
≤
5.5V
6
V
IH
=
V
CC
−
0.6V
µA
µA
µA
µA
µA
AC Electrical Characteristics
T
A
= −40°C
to
+85°C,
R
L
=
500
Ω
V
CC
=
3.3V
±
0.3V
C
L
=
50pF
Symbol
f
MAX
t
PHL
, t
PLH
t
PZL
, t
PZH
t
PLZ
, t
PHZ
t
S
t
H
t
W
t
OSHL
,
t
OSLH
V
CC
=
2.7V
C
L
=
50pF
Min.
150
1.5
1.5
1.5
2.5
1.5
3.3
V
CC
=
2.5
±
0.2
C
L
=
30pF
Min.
150
1.5
1.5
1.5
4.0
2.0
4.0
Parameter
Maximum Clock Frequency
Propagation Delay CP to O
n
Output Enable Time
Output Disable Time
Setup Time
Hold Time
Pulse Width
Output to Output Skew
7
Min.
150
1.5
1.5
1.5
2.5
1.5
3.3
Max.
8.5
8.5
7.5
Max.
9.5
9.5
8.5
Max.
10.5
10.5
9.0
Units
MHz
ns
ns
ns
ns
ns
ns
ns
1.0
Notes:
6. Outputs disabled or 3-STATE only.
7. 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 (t
OSHL
) or LOW-to-
HIGH (t
OSLH
).
4
74LCX374 Rev. 2.0.0
www.fairchildsemi.com
74LCX374 Low Voltage Octal D-Type Flip-Flop with 5V Tolerant Inputs and Outputs
Dynamic Switching Characteristics
T
A
=
25°C
Symbol
V
OLP
V
OLV
Parameter
Quiet Output Dynamic Peak V
OL
Quiet Output Dynamic Valley V
OL
Conditions
C
L
=
50pF, V
IH
=
3.3V, V
IL
=
0V
C
L
=
30pF, V
IH
=
2.5V, V
IL
=
0V
C
L
=
50pF, V
IH
=
3.3V, V
IL
=
0V
C
L
=
30pF, V
IH
=
2.5V, V
IL
=
0V
V
CC
(V)
3.3
2.5
3.3
2.5
Typical
0.8
0.6
−0.8
−0.6
Units
V
V
Capacitance
Symbol
C
IN
C
OUT
C
PD
Parameter
Input Capacitance
Output Capacitance
Power Dissipation Capacitance
Conditions
V
CC
=
Open, V
I
=
0V or V
CC
V
CC
=
3.3V, V
I
=
0V or V
CC
V
CC
=
3.3V, V
I
=
0V or V
CC
, f
=
10 MHz
Typical
7
8
25
Units
pF
pF
pF
5
74LCX374 Rev. 2.0.0
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