DM74ALS109A Dual J-K PositiveEdge-Triggered Flip-Flop with Preset and Clear
General Description
Features
The DM54ALS109A is a dual edge-triggered flip-flop. Each
flip-flop has individual J, K, clock, clear and preset inputs,
and also complementary Q and Q outputs.
Y
Information at input J or K is transferred to the Q output on
the positive going 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.
When the clock input is at either the high or low level, the J,
K input signal has no effect.
Asynchronous preset and clear inputs will set or clear Q
output respectively upon the application of low level signal.
The J-K design allows operation as a D flip-flop by tying the
J and K inputs together.
Y
Y
Y
Y
Switching specifications at 50 pF
Switching specifications guaranteed over full temperature and VCC range
Advanced oxide-isolated, ion-implanted Schottky TTL
process
Functionally and pin for pin compatible with Schottky
and LS TTL counterpart
Improved AC performance over LS109 at approximately
half the power
Connection Diagram
Dual-In-Line Package
TL/F/6196 – 1
Order Number DM74ALS109AM or DM74ALS109AN
See NS Package Number M16A or N16A
Function Table
PR
CLR
L
H
L
H
H
H
H
H
H
L
L
H
H
H
H
H
Inputs
CK
X
X
X
u
u
u
u
L
J
K
Outputs
Q
Q
X
X
X
L
H
L
H
X
X
X
X
L
L
H
H
X
H
L
L
H
H*
H*
L
H
TOGGLE
Q0
Q0
H
L
Q0
Q0
L e Low State, H e High State, X e Don’t Care
u e Positive Edge Transition, Q0 e Previous Condition of Q
*This condition is nonstable; it will not persist when present and clear inputs
return to their inactive (high) level. The output levels in this condition are not
guaranteed to meet the VOH specification.
C1995 National Semiconductor Corporation
TL/F/6196
RRD-B30M105/Printed in U. S. A.
DM74ALS109A Dual J-K Positive-Edge- Triggered Flip-Flop with Preset and Clear
December 1989
Absolute Maximum Ratings
Supply Voltage
7V
Input Voltage
7V
Operating Free Air Temperature Range
DM74ALS
Storage Temperature Range
Typical iJA
N Package
M Package
Note: 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’’
table are not guaranteed at the absolute maximum ratings.
The ‘‘Recommended Operating Conditions’’ table will define
the conditions for actual device operation.
0§ C to a 70§ C
b 65§ C to a 150§ C
82.5§ C/W
111.5§ C/W
Recommended Operating Conditions
Symbol
DM74ALS109A
Parameter
VCC
Supply Voltage
VIH
High Level Input Voltage
VIL
Low Level Input Voltage
IOH
High Level Output Current
IOL
Low Level Output Current
fCLK
Clock Frequency
tW(CLK)
Pulse Width
Units
Min
Nom
Max
4.5
5
5.5
V
2
V
0
0.8
V
b 0.4
mA
8
mA
34
MHz
Clock High
14.5
ns
Clock Low
14.5
ns
tW
Pulse Width
Preset and Clear
15
ns
tSU
Data Setup Time
J or K
15u
ns
PRE or CLR inactive
10u
0u
tH
Data Hold Time
TA
Free Air Operating Temperature
The (
ns
0
70
§C
u) arrow indicates the positive edge of the Clock is used for reference.
Electrical Characteristics
over recommended operating free-air temperature range. All typical values are measured at VCC e 5V, TA e 25§ C.
Symbol
Parameter
Conditions
VIK
Input Clamp Voltage
VCC e 4.5V, II e b18 mA
VOH
High Level Output
Voltage
IOH e b400 mA
VCC e 4.5V to 5.5V
VOL
Low Level Output
Voltage
VCC e 4.5V
VIH e 2V
II
IIH
IIL
Min
Typ
Max
Units
b 1.5
V
VCC b 2
V
54/74ALS
IOL e 4 mA
0.25
0.4
V
74ALS
IOL e 8 mA
0.35
0.5
V
Input Current at Max
Input Voltage
VCC e 5.5V,
VIH e 7V
Clock, J, K
0.1
Preset, Clear
0.2
High Level
Input Current
VCC e 5.5V,
VIH e 2.7V
Clock, J, K
20
Preset, Clear
40
Low Level
Input Current
VCC e 5.5V,
VIL e 0.4V
Clock, J, K
b 0.2
Preset, Clear
b 0.4
IO (Note 2)
Output Drive Current
VCC e 5.5V, VO e 2.25V
ICC
Supply Current
VCC e 5.5V (Note 1)
b 30
2.4
mA
mA
b 112
mA
4
mA
Note 1: ICC is measured with J, K, CLK and PRESET grounded, then with J, K, CLK and CLEAR grounded.
Note 2: The output conditions have been chosen to produce a current that closely approximates one half of the true short circuit output current, IOS.
2
mA
Switching Characteristics over recommended operating free air temperature range (Note 1)
Symbol
Parameter
Conditions
From
To
DM74ALS109A
Min
fMAX
Maximum Clock Frequency
tPLH
Propagation Delay Time
Low to High Level Output
tPHL
VCC e 4.5V to 5.5V
RL e 500X
CL e 50 pF
34
Preset
or Clear
Q or Q
Propagation Delay Time
High to Low Level Output
Preset
or Clear
Q or Q
tPLH
Propagation Delay Time
Low to High Level Output
Clock
Q or Q
tPHL
Propagation Delay Time
High to Low Level Output
Clock
Q or Q
MHz
3
13
ns
5
15
ns
5
16
ns
5
18
ns
Note 1: See Section 5 for test waveforms and output load.
Logic Diagram
TL/F/6196 – 2
3
Units
Max
4
Physical Dimensions inches (millimeters)
S.O. Package (M)
Order Number DM74ALS109AM
NS Package Number M16A
5
DM74ALS109A Dual J-K Positive-Edge- Triggered Flip-Flop with Preset and Clear
Physical Dimensions inches (millimeters) (Continued)
Molded Dual-In-Line Package (N)
Order Number DM74ALS109AN
NS Package Number N16A
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