The data output functions may be enabled or disabled by various signals at the G and DIR inputs. Data input functions are always enabled; i.e., data
at the bus pins will be stored on every LOW-to-HIGH transition of the appropriate clock inputs. Also applies to data I/O (A and B: 8-15) and #2 control pins.
Real Time Transfer
A-Bus to B-Bus
Storage from
Bus to Register
Real Time Transfer
B-Bus to A-Bus
Transfer from
Register to Bus
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2
74ACTQ16646
Logic Diagram
3
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74ACTQ16646
Absolute Maximum Ratings
(Note 2)
Supply Voltage (V
CC
)
DC Input Diode Current (I
IK
)
V
I
= −0.5V
V
I
=
V
CC
+
0.5V
DC Output Diode Current (I
OK
)
V
O
= −0.5V
V
O
=
V
CC
+
0.5V
DC Output Voltage (V
O
)
DC Output Source/Sink Current (I
O
)
DC V
CC
or Ground Current
per Output Pin
Storage Temperature
±50
mA
−65°C
to
+150°C
−20
mA
+20
mA
−0.5V
to V
CC
+
0.5V
±50
mA
−20
mA
+20
mA
−0.5V
to
+7.0V
Recommended Operating
Conditions
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
@ 4.5V, 5.5V
Note 2:
Absolute maximum ratings are those values beyond which damage
to the device may occur. The databook specifications should be met, with-
out exception to ensure that the system design is reliable over its power
supply, temperature, and output/input loading variables. Fairchild does not
recommend operation of FACT™ circuits outside databook specifications.
4.5V to 5.5V
0V to V
CC
0V to V
CC
−40°C
to
+85°C
125 mV/ns
DC Electrical Characteristics
Symbol
V
IH
V
IL
V
OH
Parameter
Minimum HIGH
Input Voltage
Maximum LOW
Input Voltage
Minimum HIGH
Output Voltage
V
CC
(V)
4.5
5.5
4.5
5.5
4.5
5.5
4.5
5.5
V
OL
Maximum LOW
Output Voltage
4.5
5.5
4.5
5.5
I
OZT
I
IN
I
CCT
I
CC
I
OLD
I
OHD
V
OLP
V
OLV
V
OHP
V
OHV
V
IHD
V
ILD
Maximum I/O
Leakage Current
Maximum Input
Leakage Current
Maximum I
CC
/Input
Max Quiescent
Supply Current
Minimum Dynamic
Output Current (Note 4)
Quick Output
Maximum Dynamic V
OL
Quick Output
Minimum Dynamic V
OL
Maximum
Overshoot
Minimum
V
CC
Droop
Minimum HIGH Dynamic
Input Voltage Level
Maximum LOW Dynamic
Input Voltage Level
Note 3:
All outputs loaded; thresholds associated with output under test.
Note 4:
Maximum test duration 2.0 ms; one output loaded at a time.
Note 5:
Worst case package.
T
A
= +25°C
Typ
1.5
1.5
1.5
1.5
4.49
5.49
2.0
2.0
0.8
0.8
4.4
5.4
3.86
4.86
0.001
0.001
0.1
0.1
0.36
0.36
±0.5
±0.1
0.6
8.0
T
A
= −40°C
to+85°C
Guaranteed Limits
2.0
2.0
0.8
0.8
4.4
5.4
Units
V
V
V
Conditions
V
OUT
=
0.1V
or V
CC
−
0.1V
V
OUT
=
0.1V
or V
CC
−
0.1V
I
OUT
= −50 µA
V
IN
=
V
IL
or V
IH
3.76
4.76
0.1
0.1
V
V
I
OH
=
−24
mA
I
OH
=
−24
mA (Note 3)
I
OUT
=
50
µA
V
IN
=
V
IL
or V
IH
0.44
0.44
±5.0
±1.0
1.5
80.0
75
−75
V
µA
µA
mA
µA
mA
mA
V
V
V
V
V
V
I
OL
= 24 mA
I
OL
= 24 mA (Note 3)
V
IN
=
V
IL
, V
IH
V
O
=
V
CC
, GND
V
I
=
V
CC
, GND
V
I
=
V
CC
−
2.1V
V
IN
=
V
CC
or GND
V
OLD
=
1.65V Max
V
OHD
=
3.85V Min
Figure 1, Figure 2
(Note 6)(Note 7)
Figure 1, Figure 2
(Note 6)(Note 7)
Figure 1, Figure 2
(Note 5)(Note 7)
Figure 1, Figure 2
(Note 5)(Note 7)
(Note 5)(Note 8)
(Note 5)(Note 8)
5.5
5.5
5.5
5.5
5.5
5.0
5.0
5.0
5.0
5.0
5.0
0.5
−0.5
V
OH
+
1.0
V
OH
−
1.0
1.7
1.2
0.8
−0.8
V
OH
+
1.5
V
OH
−
1.8
2.0
0.8
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4
74ACTQ16646
DC Electrical Characteristics
(Continued)
Note 6:
Maximum number of outputs that can switch simultaneously is n. (n
−
1) outputs are switched LOW and one output held LOW.
Note 7:
Maximum number of outputs that can switch simultaneously is n. (n
−
1) outputs are switched HIGH and one output held HIGH.
Note 8:
Maximum number of data inputs (n) switching. (n
−
1) inputs switching 0V to 3V (ACTQ). Input under test switching 3V to threshold (V
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