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
Logic Diagram
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2
74ACT16646
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
Maximum I/O
Leakage Current
Maximum Input
Leakage Current
Maximum I
CC
/Input
Max Quiescent
Supply Current
Minimum Dynamic
Output Current (Note 4)
5.5
5.5
5.5
5.5
5.5
0.6
8.0
0.001
0.001
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
0.1
0.1
0.36
0.36
±0.5
±0.1
T
A
= −40°C
to+85°C
Guaranteed Limits
2.0
2.0
0.8
0.8
4.4
5.4
3.76
4.76
0.1
0.1
0.44
0.44
±5.0
±1.0
1.5
80.0
75
−75
µA
µA
mA
µA
mA
mA
V
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
V
I
OH
=
−24
mA
I
OH
=
−24
mA (Note 3)
I
OUT
=
50
µA
V
IN
=
V
IL
or V
IH
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
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.
3
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74ACT16646
AC Electrical Characteristics
V
CC
Symbol
t
PHL
t
PLH
t
PHL
t
PLH
t
PHL
t
PLH
t
PZL
t
PZH
t
PLZ
t
PHZ
t
PZL
t
PZH
t
PLZ
t
PHZ
Parameter
Propagation Delay
Clock to Bus
Propagation Delay
Bus to Bus
Propagation Delay
Select to Bus
(w/An or Bn HIGH or LOW)
Enable Time
G to An/Bn
Disable Time
G to An/Bn
Enable Time
DIR to An/Bn
Disable Time
DIR to An/Bn
5.0
5.0
5.0
5.0
5.3
4.6
3.0
3.4
5.1
4.6
2.9
3.4
7.8
6.9
5.5
5.7
8.2
7.5
5.8
6.1
10.5
9.4
8.1
8.3
11.8
10.8
9.2
9.2
3.8
3.3
2.3
2.6
4.3
3.7
2.0
2.5
11.4
10.2
8.6
8.6
12.7
11.7
9.8
9.7
ns
ns
ns
ns
(V)
(Note 5)
5.0
5.0
5.0
Min
4.6
4.3
4.0
4.1
4.0
4.2
T
A
= +25°C
C
L
=
50 pF
Typ
6.9
6.5
6.2
6.4
6.4
6.7
Max
9.4
8.9
8.5
8.6
8.9
9.5
T
A
= −40°C
to
+85°C
C
L
=
50 pF
Min
3.6
3.3
2.9
3.2
3.1
3.2
Max
10.1
9.7
9.2
9.3
9.6
10.4
ns
ns
ns
Units
Note 5:
Voltage Range 5.0 is 5.0V
±
0.5V.
AC Operating Requirements
V
CC
Symbol
Parameter
(V)
(Note 6)
t
S
t
H
t
W
Setup Time, H or L
Bus to Clock
Hold Time, H or L
Bus to Clock
Clock Pulse Width
H or L
Note 6:
Voltage Range 5.0 is 5.0V
±
0.5V.
T
A
= +25°C
C
L
=
50 pF
T
A
= −40°C
to
+85°C
C
L
=
50 pF
Units
Guaranteed Minimum
3.0
1.5
4.0
3.0
1.5
4.0
ns
ns
ns
5.0
5.0
5.0
Capacitance
Symbol
C
IN
C
PD
Parameter
Input Capacitance
Power Dissipation Capacitance
Typ
4.5
95
Units
pF
pF
V
CC
=
5.0V
V
CC
=
5.0V
Conditions
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4
74ACT16646
Physical Dimensions
inches (millimeters) unless otherwise noted
56-Lead Shrink Small Outline Package (SSOP), JEDEC MO-118, 0.300” Wide
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