The level of the steady-state input at inputs A through H, respectively. These data are loaded into the flip-flops while the flip-flop outputs are isolated
from the input/output terminals.
H
=
HIGH Level
L
=
LOW Logic Level
X
=
Either LOW or HIGH Logic Level
Q
A0
...Q
H0
=
The output logic level of Q
X
before the indicated input conditions were established.
Q
An
...Q
Hn
=
The output logic level before the active transition (↑) of the clock input.
Note 1:
When one or both output controls are HIGH the eight input/output terminals are disabled to the high-impedance state; however, sequential operation
or clearing of the register is not affected
Logic Diagram
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2
DM74S299
Absolute Maximum Ratings
(Note 2)
Supply Voltage
Input Voltage
Operating Free Air Temperature Range
Storage Temperature Range
7V
5.5V
0°C to
+70°C
−65°C
to
+150°C
Note 2:
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.
Recommended Operating Conditions
Symbol
V
CC
V
IH
V
IL
I
OH
I
OL
f
CLK
f
CLK
t
W
Supply Voltage
HIGH Level Input Voltage
LOW Level Input Voltage
HIGH Level Output Current (Q
A
thru Q
H
)
HIGH Level Output Current (Q
A′
, Q
H′
)
LOW Level Output Current (Q
A
thru Q
H
)
HIGH Level Output Current (Q
A′
, Q
H′
)
Clock Frequency (Note 3)
Clock Frequency (Note 4)
Pulse Width (Note 5)
Clock HIGH
Clock LOW
Clear LOW
t
SU
Setup Time (Note 6)(Note 5)(Note 7)
Select
Data HIGH
Data LOW
t
H
t
REL
T
A
Hold Time (Note 5)(Note 7)
Clear Release Time (Note 5)
Free Air Operating Temperature
0
0
10
10
10
15↑
7↑
5↑
5↑
10↑
0
70
ns
ns
°C
ns
ns
70
60
Parameter
Min
4.75
2
0.8
−6.5
−0.5
20
6
50
40
Nom
5
Max
5.25
Units
V
V
V
mA
mA
MHz
MHz
Note 3:
C
L
=
15 pF, R
L
=
280Ω, T
A
=
25°C and V
CC
=
5V.
Note 4:
C
L
=
50 pF, R
L
=
280Ω, T
A
=
25°C and V
CC
=
5V.
Note 5:
T
A
=
25°C and V
CC
=
5V.
Note 6:
The symbol (↑) indicates the rising edge of the clock pulse is used for reference.
Note 7:
Data includes the two serial inputs and the eight input/output data lines.
3
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DM74S299
Electrical Characteristics
over recommended operating free air temperature (unless otherwise noted)
Symbol
V
I
V
OH
V
OL
I
I
I
IH
Parameter
Input Clamp Voltage
HIGH Level
Output Voltage
LOW Level
Output Voltage
Input Current @ Max Input Voltage
HIGH Level
Input Current
I
IL
LOW Level
Input Current
I
OZH
Off-State Output Current with
HIGH Level Output Voltage
Applied (Q
A
thru Q
H
)
I
OZL
Off-State Output Current with
LOW Level Output Voltage
Applied (Q
A
thru Q
H
)
I
OS
Short Circuit Output
Current (Q
A
thru Q
H
)
Short Circuit Output
Current (Q
A′
, Q
H′
)
I
CC
Supply Current
Note 8:
T
A
=
25°C and V
CC
=
5V.
Note 9:
All typicals are at V
CC
=
5V, T
A
=
25°C.
Note 10:
Not more than one output should be shorted at a time, and the duration should not exceed one second.
Conditions
V
CC
=
Min, I
I
= −18
mA
V
CC
=
Min, I
OH
=
Max
V
IL
=
Max, V
IH
=
Min
V
CC
=
Min, I
OL
=
Max
V
IH
=
Min, V
IL
=
Max
V
CC
=
Max, V
I
=
5.5V
V
CC
=
Max
V
I
=
2.7V
V
CC
=
Max
V
I
=
0.5V
V
CC
=
Max, V
O
=
2.4V
V
IH
=
Min, V
IL
=
Max
V
CC
=
Max, V
O
=
0.5V
V
IH
=
Min, V
IL
=
Max
V
CC
=
Max
(Note 10)
V
CC
=
Max
(Note 10)
V
CC
=
Max
A thru H,
S0, S1
Any Other
Clock, Clear
S0, S1
Other
Q
A
thru Q
H
Q
A′
, Q
H′
Min
Typ
(Note 8)
3.2
3.4
Max
−1.2
Units
V
V
2.4
2.7
0.5
1
100
V
mA
µA
50
−2
−0.5
−0.25
100
µA
mA
−250
µA
−40
−20
140
−100
mA
−100
225
mA
Switching Characteristics
at V
CC
=
5V and T
A
=
25°C (See Section 1 for Test Waveforms and Output Load)
R
L
=
280Ω (Note 12)
Symbol
Parameter
From (Input)
To (Output)
f
MAX
t
PLH
t
PHL
t
PLH
t
PHL
t
PHL
t
PHL
Maximum Clock Frequency
Propagation Delay Time
LOW-to-HIGH Level Output (Note 12)
Propagation Delay Time
HIGH-to-LOW Level Output (Note 12)
Propagation Delay Time
LOW-to-HIGH Level Output
Propagation Delay Time
HIGH-to-LOW Level Output
Propagation Delay Time
HIGH-to-LOW Level Output (Note 12)
Propagation Delay Time
HIGH-to-LOW Level Output
t
PZH
t
PZL
t
PHZ
t
PLZ
Output Enable Time to HIGH Level Output
Output Enable Time to LOW Level Output
G1, G2 to Q
A
thru Q
H
G1, G2 to Q
A
thru Q
H
12
12
Clear to Q
A
thru Q
H
Clear to Q
A′
or Q
H′
21
Clock to Q
A
thru Q
H
Clock to Q
A
thru Q
H
Clock to Q
A′
or Q
H
′
(Note 13)
Clock to Q
A′
or Q
H′
C
L
=
15 pF
Min
50
20
20
Max
C
L
=
50 pF
Min
40
22
23
21
21
24
24
18
18
Max
MHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Units
Output Disable Time to HIGH Level Output (Note 11) G1, G2 to Q
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