2000 Fairchild Semiconductor Corporation
DS500295
www.fairchildsemi.com
August 1999
Revised November 2000
7
4
AC
1
6244
74ACT16244 16-
Bit
Buf
f
er
/Li
n
e D
r
ive
r
wi
th 3-
S
T
A
T
E
Out
puts
74AC16244 74ACT16244
16-Bit Buffer/Line Driver with 3-STATE Outputs
General Description
The AC16244 and ACT16244 contain sixteen non-inverting
buffers with 3-STATE outputs designed to be employed as
a memory and address driver, clock driver, or bus oriented
transmitter/receiver. The device is nibble controlled. Each
nibble has separate 3-STATE control inputs which can be
shorted together for full 16-bit operation.
Features
s
Separate control logic for each byte and nibble
s
16-bit version of the AC244/ACT244
s
Outputs source/sink 24 mA
s
ACT16244 has TTL-compatible inputs
Ordering Code:
Device also available in Tape and Reel. Specify by appending suffix letter "X" to the ordering code.
Logic Symbol
Pin Descriptions
Connection Diagram
FACT
is a trademark of Fairchild Semiconductor Corporation.
Order Number
Package Number
Package Description
74AC16244SSC
MS48A
48-Lead Small Shrink Outline Package (SSOP), JEDEC MO-118, 0.300 Wide
74ACT16244SSC
MS48A
48-Lead Small Shrink Outline Package (SSOP), JEDEC MO-118, 0.300 Wide
74ACT16244MTD
MTD48
48-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide
Pin Names
Description
OE
n
Output Enable Input (Active LOW)
I
0
- I
15
Inputs
O
0
- 0
15
Outputs
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2
74AC16244
74ACT16244
Functional Description
The AC16244 and ACT16244 contain sixteen non-inverting
buffers with 3-STATE standard outputs. The device is nib-
ble (4 bits) controlled with each nibble functioning identi-
cally, but independent of the other. The control pins can be
shorted together to obtain full 16-bit operation. The
3-STATE outputs are controlled by an Output Enable (OE
n
)
input for each nibble. When OE
n
is LOW, the outputs are in
2-state mode. When OE
n
is HIGH, the outputs are in the
high impedance mode, but this does not interfere with
entering new data into the inputs.
Truth Tables
L
=
LOW Voltage Level
H
=
HIGH Voltage Level
X
=
Immaterial
Z
=
High Impedance
Logic Diagram
Inputs
Outputs
OE
1
I
0
I
3
O
0
O
3
L
L
L
L
H
H
H
X
Z
Inputs
Outputs
OE
2
I
4
I
7
O
4
O
7
L
L
L
L
H
H
H
X
Z
Inputs
Outputs
OE
3
I
8
I
11
O
8
O
11
L
L
L
L
H
H
H
X
Z
Inputs
Outputs
OE
4
I
12
I
15
O
12
O
15
L
L
L
L
H
H
H
X
Z
3
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7
4
AC
1
6244
74ACT16244
Absolute Maximum Ratings
(Note 1)
Recommended Operating
Conditions
Note 1: 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.
DC Electrical Characteristics for AC
Note 2: All outputs loaded; thresholds associated with output under test.
Note 3: I
IN
and I
CC
@ 3.0V are guaranteed to be less than or equal to the respective limit @ 5.5V V
CC
.
Note 4: Maximum test duration 2.0 millisecond; one output loaded at a time.
Supply Voltage (V
CC
)
-
0.5V to
+
7.0V
DC Input Diode Current (I
IK
)
V
I
=
-
0.5V
-
20 mA
V
I
=
V
CC
+
0.5V
+
20 mA
DC Output Diode Current (I
OK
)
V
O
=
-
0.5V
-
20 mA
V
O
=
V
CC
+
0.5V
+
20 mA
DC Output Voltage (V
O
)
-
0.5V to V
CC
+
0.5V
DC Output Source/Sink Current (I
O
)
50 mA
DC V
CC
or Ground Current
per Output Pin
50 mA
Junction Temperature
+
140
C
Storage Temperature
-
65
C to
+
150
C
Supply Voltage (V
CC
)
AC
2.0V to 6.0V
ACT
4.5V to 5.5V
Input Voltage (V
I
)
0V to V
CC
Output Voltage (V
O
)
0V to V
CC
Operating Temperature (T
A
)
-
40
C to
+
85
C
Minimum Input Edge Rate (
V/
t)
AC Devices
V
IN
from 30% to 70%
V
CC
@ 3.3V, 4.5V, 5.5V
125 mV/ns
Minimum Input Edge Rate (
V/
t)
ACT Devices
V
IN
from 0.8V to 2.0V
V
CC
@ 4.5V, 5.5V
125 mV/ns
Symbol
Parameter
V
CC
T
A
=
+
25
C
T
A
=
-
40
C to
+
85
C
Units
Conditions
(V)
Typ
Guaranteed Limits
V
IH
Minimum HIGH Input Voltage
3.0
1.5
2.1
2.1
V
V
OUT
=
0.1V
4.5
2.25
3.15
3.15
or V
CC
-
0.1V
5.5
2.75
3.85
3.85
V
IL
Maximum LOW Input Voltage
3.0
1.5
0.9
0.9
V
V
OUT
=
0.1V
4.5
2.25
1.35
1.35
or V
CC
-
0.1V
5.5
2.75
1.65
1.65
V
OH
Minimum HIGH Output Voltage
3.0
2.99
2.9
2.9
V
I
OUT
=
-
50
A
4.5
4.49
4.4
4.4
5.5
5.49
5.4
5.4
3.0
2.56
2.46
I
OH
=
-12 mA
4.5
3.86
3.76
V
I
OH
=
-
24 mA
5.5
4.86
4.76
I
OH
=
-
24 mA (Note 2)
V
OL
Maximum LOW Output Voltage
3.0
0.002
0.1
0.1
V
I
OUT
=
50
A
4.5
0.001
0.1
0.1
5.5
0.001
0.1
0.1
3.0
0.36
0.44
I
OL
=
12 mA
4.5
0.36
0.44
V
I
OL
=
24 mA
5.5
0.36
0.44
I
OL
=
24 mA (Note 2)
I
OZ
Maximum 3-STATE Leakage Current
5.5
0.50
5.0
A
V
I
(OE)
=
V
IL
, V
IH
V
I
=
V
CC
, GND
V
O
=
V
CC
, GND
I
IN
Maximum Input Leakage Current (Note 3)
5.5
0.1
1.0
A
V
I
=
V
CC
, GND
I
CC
Max Quiescent Supply Current (Note 3)
5.5
8.0
80.0
A
V
IN
=
V
CC
or GND
I
OLD
Minimum Dynamic
5.5
75
mA
V
OLD
=
1.65V Max
I
OHD
Output Current (Note 4)
5.5
-
75
mA
V
OHD
=
3.85V Min
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4
74AC16244
74ACT16244
DC Electrical Characteristics for ACT
Note 5: All outputs loaded; thresholds associated with output under test.
Note 6: Maximum test duration 2.0 millisecond; one output loaded at a time.
Symbol
Parameter
V
CC
T
A
=
+
25
C
T
A
=
-
40
C to
+
85
C
Units
Conditions
(V)
Typ
Guaranteed Limits
V
IH
Minimum HIGH Input Voltage
4.5
1.5
2.0
2.0
V
V
OUT
=
0.1V
5.5
1.5
2.0
2.0
or V
CC
-
0.1V
V
IL
Maximum LOW Input Voltage
4.5
1.5
0.8
0.8
V
V
OUT
=
0.1V
5.5
1.5
0.8
0.8
or V
CC
-
0.1V
V
OH
Minimum HIGH Output Voltage
4.5
4.49
4.4
4.4
V
I
OUT
=
-
50
A
5.5
5.49
5.4
5.4
V
IN
=
V
IL
or V
IH
4.5
3.86
3.76
V
I
OH
=
-
24 mA
5.5
4.86
4.76
I
OH
=
-
24 mA (Note 5)
V
OL
Maximum LOW Output Voltage
4.5
0.001
0.1
0.1
V
I
OUT
=
50
A
5.5
0.001
0.1
0.1
V
IN
=
V
IL
or V
IH
4.5
0.36
0.44
V
I
OH
=
24 mA
5.5
0.36
0.44
I
OH
=
24 mA (Note 5)
I
OZ
Maximum 3-STATE Leakage Current
5.5
0.5
5.0
A
V
I
=
V
IL
, V
IH
V
O
=
V
CC
, GND
I
IN
Maximum Input Leakage Current
5.5
0.1
1.0
A
V
I
=
V
CC
, GND
I
CCT
Maximum I
CC
/Input
5.5
0.6
1.5
mA
V
I
=
V
CC
-
2.1V
I
CC
Max Quiescent Supply Current
5.5
8.0
80.0
A
V
IN
=
V
CC
or GND
I
OLD
Minimum Dynamic
5.5
75
mA
V
OLD
=
1.65V Max
I
OHD
Output Current (Note 6)
-
75
mA
V
OHD
=
3.85V Min
5
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7
4
AC
1
6244
74ACT16244
AC Electrical Characteristics for AC
Note 7: Voltage Range 5.0 is 5.0V
0.5V.
Voltage Range 3.3 is 3.3V
0.3V.
AC Electrical Characteristics for ACT
Note 8: Voltage Range 5.0 is 5.0V
0.5V.
Capacitance
V
CC
T
A
=
+
25
C
T
A
=
-
40
C to
+
85
C
Symbol
Parameter
(V)
C
L
=
50 pF
C
L
=
50 pF
Units
(Note 7)
Min
Typ
Max
Min
Max
t
PLH
Propagation Delay
3.3
2.0
6.3
9.4
2.0
10.8
ns
Data to Output
5.0
1.6
4.6
6.5
1.6
7.1
t
PHL
Propagation Delay
3.3
2.4
5.7
10.7
2.4
11.8
ns
Data to Output
5.0
2.0
4.3
7.0
2.0
7.9
t
PZH
Output Enable Time
3.3
2.2
6.2
10
2.2
11.5
ns
5.0
1.7
4.6
6.7
1.7
7.5
t
PZL
Output Enable Time
3.3
2.9
6.4
13.0
2.9
14.6
ns
5.0
2.2
4.7
8.1
2.2
9.0
t
PHZ
Output Disable Time
3.3
3.1
5.5
8.4
3.1
9.1
ns
5.0
1.9
3.9
7.8
1.9
8.4
t
PLZ
Output Disable Time
3.3
2.4
4.7
8.1
2.4
8.8
ns
5.0
1.7
3.6
7.2
1.7
7.6
V
CC
T
A
=
+
25
C
T
A
=
-
40
C to
+
85
C
Symbol
Parameter
(V)
C
L
=
50 pF
C
L
=
50 pF
Units
(Note 8)
Min
Typ
Max
Min
Max
t
PLH
Propagation Delay
5.0
3.0
5.2
7.3
3.0
7.8
ns
t
PHL
Data to Output
2.5
4.8
6.8
2.5
7.3
t
PZH
Output Enable
5.0
2.5
5.0
7.4
2.5
7.9
ns
t
PZL
Time
2.7
4.6
7.5
2.7
8.0
t
PHZ
Output Disable
5.0
2.3
5.0
7.9
2.3
8.2
ns
t
PLZ
Time
2.0
4.6
7.4
2.0
7.9
Symbol
Parameter
Typ
Units
Conditions
C
IN
Input Pin Capacitance
4.5
pF
V
CC
=
5.0V
C
OUT
Output Pin Capacitance
12
pF
V
CC
=
5.0V
C
PD
Power Dissipation Capacitance
74AC16244
35
pF
V
CC
=
5.0V
74ACT16244
30
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