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74LVQ74 Low Voltage Dual D-Type Positive Edge-Triggered Flip-Flop
February 1992
Revised June 2001
74LVQ74
Low Voltage Dual D-Type
Positive Edge-Triggered Flip-Flop
General Description
The LVQ74 is a dual D-type flip-flop with Asynchronous
Clear and Set inputs and complementary (Q, Q) outputs.
Information at the input is transferred to the outputs on the
positive edge of the clock pulse. Clock triggering occurs at
a voltage level of the clock pulse and is not directly related
to the transition time of the positive-going pulse. After the
Clock Pulse input threshold voltage has been passed, the
Data input is locked out and information present will not be
transferred to the outputs until the next rising edge of the
Clock Pulse input.
Asynchronous Inputs:
LOW input to S
D
(Set) sets Q to HIGH level
LOW input to C
D
(Clear) sets Q to LOW level
Clear and Set are independent of clock
Simultaneous LOW on C
D
and S
D
makes both
Q and Q HIGH
Features
s
Ideal for low power/low noise 3.3V applications
s
Guaranteed simultaneous switching noise level and
dynamic threshold performance
s
Guaranteed pin-to-pin skew AC performance
s
Guaranteed incident wave switching into 75
Ω
Ordering Code:
Order Number
74LVQ74SC
74LVQ74SJ
Package Number
M14A
M14D
Package Description
14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow
14-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Logic Symbols
Connection Diagram
IEEE/IEC
Pin Descriptions
Pin Names
D
1
, D
2
CP
1
, CP
2
C
D1
, C
D2
S
D1
, S
D2
Q
1
, Q
1
, Q
2
, Q
2
© 2001 Fairchild Semiconductor Corporation
DS011347
Description
Data Inputs
Clock Pulse Inputs
Direct Clear Inputs
Direct Set Inputs
Outputs
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74LVQ74
Truth Table
Inputs
S
D
L
H
L
H
H
H
C
D
H
L
L
H
H
H
CP
X
X
D
X
X
X
H
L
X
Q
H
L
H
H
L
Q
0
Outputs
Q
L
H
H
L
H
Q
0
X
L
H
=
HIGH Voltage Level
L
=
LOW Voltage Level
X
=
Immaterial
=
LOW-to-HIGH Clock Transition
Q
0
(Q
0
)
=
Previous Q(Q) before LOW-to-HIGH Transition of Clock
Logic Diagram
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
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2
74LVQ74
Absolute Maximum Ratings
(Note 1)
Supply Voltage (V
CC
)
DC Input Diode Current (I
IK
)
V
I
= −
0.5V
V
I
=
V
CC
+
0.5V
DC Input Voltage (V
I
)
DC Output Diode Current (I
OK
)
V
O
= −
0.5V
V
O
=
V
CC
+
0.5V
DC Output Voltage (V
O
)
DC Output Source
or Sink Current (I
O
)
DC V
CC
or Ground Current
(I
CC
or I
GND
)
Storage Temperature (T
STG
)
DC Latch-Up Source or
Sink Current
−
0.5V to
+
7.0V
−
20 mA
+
20 mA
−
0.5V to V
CC
+
0.5V
−
20 mA
+
20 mA
−
0.5V to V
CC
+
0.5V
±
50 mA
±
200 mA
−
65
°
C to
+
150
°
C
±
100 mA
Recommended Operating
Conditions
(Note 2)
Supply Voltage (V
CC
)
Input Voltage (V
I
)
Output Voltage (V
O
)
Operating Temperature (T
A
)
Minimum Input Edge Rate (
∆
V/
∆
t)
V
IN
from 0.8V to 2.0V
V
CC
@ 3.0V
125 mV/ns
2.0V to 3.6V
0V to V
CC
0V to V
CC
−
40
°
C to
+
85
°
C
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:
Unused inputs must be held HIGH or LOW. They may not float.
DC Electrical Characteristics
Symbol
V
IH
V
IL
V
OH
Parameter
Minimum High Level
Maximum Low Level
Input Voltage
Minimum High Level
Output Voltage
V
OL
Maximum Low Level
Output Voltage
I
IN
I
OLD
I
OHD
I
CC
V
OLP
V
OLV
V
IHD
V
ILD
Maximum Input
Leakage Current
Minimum Dynamic
Output Current (Note 4)
Maximum Quiescent
Supply Current
Quiet Output
Maximum Dynamic V
OL
Quiet Output
Minimum Dynamic V
OL
Maximum High Level
Dynamic Input Voltage
Maximum Low Level
Dynamic Input Voltage
V
CC
(V)
3.0
T
A
= +25°C
Typ
1.5
2.0
T
A
= −40°C
to
+85°C
Guaranteed Limits
2.0
V
V
OUT
=
0.1V
or V
CC
−
0.1V
3.0
3.0
3.0
3.0
3.0
3.6
3.6
3.6
3.6
3.3
3.3
3.3
3.3
0.2
−0.2
1.7
1.6
2.0
0.8
−0.8
2.0
0.8
0.002
1.5
2.99
0.8
2.9
2.58
0.1
0.36
±0.1
0.8
2.9
2.48
0.1
0.44
±1.0
36
−25
20.0
V
V
V
V
V
µA
mA
mA
µA
V
V
V
V
V
OUT
=
0.1V
or V
CC
−
0.1V
I
OUT
= −50 µA
V
IN
=
V
IL
or V
IH
(Note 3)
I
OH
= −12
mA
I
OUT
=
50
µA
V
IN
=
V
IL
or V
IH
(Note 3)
I
OL
=
12 mA
V
I
=
V
CC
,
GND
V
OLD
=
0.8V Max (Note 5)
V
OHD
=
2.0V Min (Note 5)
V
IN
=
V
CC
or GND
(Note 6)(Note 7)
(Note 6)(Note 7)
(Note 6)(Note 8)
(Note 6)(Note 8)
Units
Conditions
Note 3:
All outputs loaded; thresholds on input associated with output under test.
Note 4:
Maximum test duration 2.0 ms, one output loaded at a time.
Note 5:
Incident wave switching on transmission lines with impedances as low as 75Ω for commercial temperature range is guaranteed for 74LVQ.
Note 6:
Worst case package.
Note 7:
Max number of outputs defined as (n). Data inputs are driven 0V to 3.3V; one output at GND.
Note 8:
Max number of Data Inputs (n) switching. (n
−
1) inputs switching 0V to 3.3V. Input-under-test switching: 3.3V to threshold (V
ILD
), 0V to threshold
(V
IHD
), f
=
1 MHz.
3
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74LVQ74
AC Electrical Characteristics
T
A
= +25°C
Symbol
Parameter
V
CC
(V)
f
MAX
t
PLH
t
PHL
t
PLH
t
PHL
t
OSHL
t
OSLH
Maximum Clock
Frequency
Propagation Delay
C
Dn
or S
Dn
to Q
n
Propagation Delay
C
Dn
or S
Dn
to Q
n
Propagation Delay
CP
n
to Q
n
or Q
n
Propagation Delay
CP
n
to Q
n
or Q
n
Output to Output Skew (Note 9)
Data to Output
2.7
3.3
±
0.3
2.7
3.3
±
0.3
2.7
3.3
±
0.3
2.7
3.3
±
0.3
2.7
3.3
±
0.3
2.7
3.3
±
0.3
Min
50
100
3.5
3.5
4.0
4.0
4.5
4.5
3.5
3.5
C
L
=
50 pF
Typ
100
125
9.6
8.0
12.6
10.5
9.6
8.0
9.6
8.0
1.0
1.0
16.9
12.0
16.9
12.0
19.0
13.5
19.7
14.0
1.5
1.5
Max
T
A
= −40°C
to
+85°C
C
L
=
50 pF
Min
40
95
3.5
2.5
3.5
3.5
4.0
4.0
3.5
3.5
19.0
13.0
19.0
13.5
23.0
16.0
21.0
14.5
1.5
1.5
Max
MHz
ns
ns
ns
ns
ns
Units
Note 9:
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
). Parameter guaranteed by design.
AC Operating Requirements
T
A
= +25°C
Symbol
Parameter
V
CC
(V)
t
S
t
H
t
W
t
REC
Set-up Time, HIGH or LOW
Hold Time, HIGH or LOW
D
n
to CP
n
Pulse Width
Recovery Time
2.7
3.3
±
0.3
2.7
3.3
±
0.3
2.7
3.3
±
0.3
2.7
3.3
±
0.3
Typ
1.8
1.5
−2.4
−2.0
3.6
3.0
−3.0
−2.5
C
L
=
50 pF
5.0
4.0
0.5
0.5
7.0
5.5
0
0
T
A
= −40°C
to
+85°C
C
L
=
50 pF
Guaranteed Minimum
6.5
4.5
0.5
0.5
10.0
7.0
0
0
ns
ns
ns
ns
Units
Capacitance
Symbol
C
IN
C
PD
(Note 10)
Parameter
Input Capacitance
Power Dissipation Capacitance
Typ
4.5
25
Units
pF
pF
V
CC
=
Open
V
CC
=
3.3V
Conditions
Note 10:
C
PD
is measured at 10 MHz.
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4
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