74ACQ244 • 74ACTQ244 Quiet Series Octal Buffer/Line Driver with 3-STATE Outputs
July 1989
Revised November 1999
74ACQ244 • 74ACTQ244
Quiet Series Octal Buffer/Line Driver
with 3-STATE Outputs
General Description
The ACQ/ACTQ244 is an octal buffer and line driver
designed to be employed as a memory address driver,
clock driver and bus oriented transmitter or receiver which
provides improved PC board density. The ACQ/ACTQ uti-
lizes Fairchild Quiet Series technology to guarantee quiet
output switching and improved dynamic threshold perfor-
mance. FACT Quiet Series features GTO output control
and undershoot corrector in addition to a split ground bus
for superior performance.
Features
s
I
CC
and I
OZ
reduced by 50%
s
Guaranteed simultaneous switching noise level and
dynamic threshold performance
s
Guaranteed pin-to-pin skew AC performance
s
Improved latch-up immunity
s
3-STATE outputs drive bus lines or buffer memory
address registers
s
Outputs source/sink 24 mA
s
Faster prop delays than the standard AC/ACT244
Ordering Code:
Order Number
74ACQ244SC
74ACQ244SJ
74ACQ244PC
74ACTQ244SC
74ACTQ244SJ
74ACTQ244QSC
74ACTQ244MSA
74ACTQ244PC
Package Number
M20B
M20D
N20A
M20B
M20D
MQA20
MSA20
N20A
Package Description
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300” Wide Body
20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300” Wide Body
20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
20-Lead Quarter Size Outline Package (QSOP), JEDEC MO-137, 0.150” Wide
20-Lead Shrink Small Outline Package (SSOP), EIAJ TYPE II, 5.3mm Wide
20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide
Device also available in Tape and Reel. Specify by appending suffix letter “X” to the ordering code.
Connection Diagram
Pin Descriptions
Pin Names
OE
1
, OE
2
I
0
–I
7
O
0
–O
7
Description
3-STATE Output Enable Inputs
Inputs
Outputs
FACT, Quiet Series, FACT Quiet Series, and GTO are trademarks of Fairchild Semiconductor Corporation.
© 1999 Fairchild Semiconductor Corporation
DS010235
www.fairchildsemi.com
74ACQ244 • 74ACTQ244
Logic Symbol
IEE/IEC
Truth Tables
Inputs
OE
1
L
L
H
Inputs
OE
2
L
L
H
H
=
HIGH Voltage Level
L
=
LOW Voltage Level
X
=
Inmaterial
Z
=
HIGH Impedance
Outputs
In
L
H
X
(Pins 12, 14, 16, 18)
L
H
Z
Outputs
In
L
H
X
(Pins 3, 5, 7, 9)
L
H
Z
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2
74ACQ244 • 74ACTQ244
Absolute Maximum Ratings
(Note 1)
Supply Voltage (V
CC
)
DC Input Diode Current (I
IK
)
V
I
= −0.5V
V
I
=
V
CC
+
0.5V
DC Input Voltage (V
I
)
DC Output Diode Current (I
OK
)
V
O
= −0.5V
V
O
=
V
CC
+
0.5V
DC Output Voltage (V
O
)
DC Output Source
or Sink Current (I
O
)
DC V
CC
or Ground Current
per Output Pin (I
CC
or I
GND
)
Storage Temperature (T
STG
)
DC Latch-Up Source or
Sink Current
Junction Temperature (T
J
)
PDIP
140°C
±300
mA
±50
mA
−65°C
to
+150°C
±50
mA
−20
mA
+20
mA
−0.5V
to V
CC
+
0.5V
−20
mA
+20
mA
−0.5V
to V
CC
+
0.5V
−0.5V
to
+7.0V
Recommended Operating
Conditions
Supply Voltage (V
CC
)
ACQ
ACTQ
Input Voltage (V
I
)
Output Voltage (V
O
)
Operating Temperature (T
A
)
Minimum Input Edge Rate
∆V/∆t
ACQ Devices
V
IN
from 30% to 70% of V
CC
V
CC
@ 3.0V, 4.5V, 5.5V
Minimum Input Edge Rate
∆V/∆t
ACTQ Devices
V
IN
from 0.8V to 2.0V
V
CC
@ 4.5V, 5.5V
125 mV/ns
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.
2.0V to 6.0V
4.5V to 5.5V
0V to V
CC
0V to V
CC
−40°C
to
+85°C
125 mV/ns
DC Electrical Characteristics for ACQ
Symbol
V
IH
Parameter
Minimum HIGH Level
Input Voltage
V
IL
Maximum LOW Level
Input Voltage
V
OH
Minimum HIGH Level
Output Voltage
V
CC
(V)
3.0
4.5
5.5
3.0
4.5
5.5
3.0
4.5
5.5
3.0
4.5
5.5
V
OL
Maximum LOW Level
Output Voltage
3.0
4.5
5.5
3.0
4.5
5.5
I
IN
(Note 4)
I
OLD
I
OHD
I
CC
(Note 4)
I
OZ
Maximum Input
Leakage Current
Minimum Dynamic
Output Current (Note 3)
Maximum Quiescent
Supply Current
Maximum 3-STATE
Leakage Current
5.5
±0.25
±2.5
µA
5.5
5.5
5.5
5.5
4.0
0.002
0.001
0.001
T
A
= +25°C
Typ
1.5
2.25
2.75
1.5
2.25
2.75
2.99
4.49
5.49
2.1
3.15
3.85
0.9
1.35
1.65
2.9
4.4
5.4
2.56
3.86
4.86
0.1
0.1
0.1
0.36
0.36
0.36
±0.1
T
A
= −40°C
to
+85°C
Guaranteed Limits
2.1
3.15
3.85
0.9
1.35
1.65
2.9
4.4
5.4
V
IN
=
V
IL
or V
IH
2.46
3.76
4.76
0.1
0.1
0.1
V
IN
=
V
IL
or V
IH
0.44
0.44
0.44
±1.0
75
−75
40.0
µA
mA
mA
µA
V
I
OL
= 12 mA
I
OL
= 24 mA
I
OL
= 24 mA (Note 2)
V
I
=
V
CC
, GND
V
OLD
=
1.65V Max
V
OHD
=
3.85V Min
V
IN
=
V
CC
or GND
V
I
(OE)
=
V
IL
, V
IH
V
I
=
V
CC
, GND
V
O
=
V
CC
, GND
V
I
OUT
=
50
µA
V
I
OH
=
−12
mA
I
OH
=
−24
mA
I
OH
=
−24
mA (Note 2)
V
I
OUT
= −50 µA
V
V
OUT
=
0.1V
or V
CC
−
0.1V
V
Units
Conditions
V
OUT
=
0.1V
or V
CC
−
0.1V
3
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74ACQ244 • 74ACTQ244
DC Electrical Characteristics for ACQ
Symbol
V
OLP
V
OLV
V
IHD
V
ILD
Parameter
Quiet Output
Maximum Dynamic V
OL
Quiet Output
Minimum Dynamic V
OL
Minimum HIGH Level
Dynamic Input Voltage
Maximum LOW Level
Dynamic Input Voltage
V
CC
(V)
5.0
5.0
5.0
5.0
T
A
= +25°C
Typ
1.1
−0.6
3.1
1.9
(Continued)
T
A
= −40°C
to
+85°C
Guaranteed Limits
Units
Conditions
Figure 1, Figure 2
(Note 5)(Note 6)
Figure 1, Figure 2
(Note 5)(Note 6)
(Note 5)(Note 7)
(Note 5)(Note 7)
1.5
−1.2
3.5
1.5
V
V
V
V
Note 2:
All outputs loaded thresholds on input associated with output under test.
Note 3:
Maximum test duration 2.0 ms, one output loaded at a time.
Note 4:
I
IN
and I
CC
@ 3.0V are guaranteed to be less than or equal to the respective limit @ 5.5V V
CC
.
Note 5:
DIP package.
Note 6:
Max number of outputs defined as (n). Data Inputs are driven 0V to 5V. One output @ GND.
Note 7:
Max number of Data Inputs (n) switching. (n
−
1) Inputs switching 0V to 5V (ACQ). Input-under-test switching: 5V to threshold (V
ILD
),
0V to threshold (V
IHD
), f
=
1 MHz.
DC Electrical Characteristics for ACTQ
Symbol
V
IH
V
IL
V
OH
Parameter
Minimum HIGH Level
Input Voltage
Maximum LOW Level
Input Voltage
Minimum HIGH Level
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 Level
Output Voltage
4.5
5.5
4.5
5.5
I
IN
(Note
4)
I
OZ
I
CCT
I
OLD
I
OHD
I
CC
(Note 4)
V
OLP
V
OLV
V
IHD
V
ILD
Maximum Input Leakage Current
Maximum 3-STATE
Leakage Current
Maximum I
CC
/Input
Minimum Dynamic
Output Current (Note 9)
Maximum Quiescent
Supply Current
Quiet Output
Maximum Dynamic V
OL
Quiet Output
Minimum Dynamic V
OL
Minimum HIGH Level
Dynamic Input Voltage
Maximum LOW Level
Dynamic Input Voltage
5.5
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
±0.1
±0.25
0.6
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
±1.0
±2.5
1.5
75
−75
4.0
1.1
−0.6
1.9
1.2
1.5
−1.2
2.2
0.8
40.0
µA
µA
mA
mA
mA
µA
V
V
V
V
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 8)
I
OUT
=
50
µA
V
IN
=
V
IL
or V
IH
V
I
OL
= 24 mA
I
OL
= 24 mA (Note 8)
V
I
=
V
CC
, GND
V
I
=
V
IL
, V
IH
V
O
=
V
CC
, GND
V
I
=
V
CC
−
2.1V
V
OLD
=
1.65V Max
V
OHD
=
3.85V Min
V
IN
=
V
CC
or GND
Figure 1, Figure 2
(Note 10)(Note 11)
Figure 1, Figure 2
(Note 10)(Note 11)
(Note 10)(Note 12)
(Note 10)(Note 12)
5.5
5.5
5.5
5.5
5.5
5.0
5.0
5.0
5.0
Note 8:
All outputs loaded thresholds on input associated with output under test.
Note 9:
Maximum test duration 2.0 ms, one output loaded at a time.
Note 10:
DIP package.
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4
74ACQ244 • 74ACTQ244
DC Electrical Characteristics for ACTQ
(Continued)
Note 11:
Max number of outputs defined as (n). Data Inputs are driven 0V to 3V. One output @ GND.
Note 12:
Max number of Data Inputs (n) switching. (n−1) Inputs switching 0V to 3V (ACTQ). Input-under-test switching: 3V to threshold (V
ILD
),
0V to threshold (V
IHD
), f
=
1 MHz.
AC Electrical Characteristics for ACQ
V
CC
Symbol
t
PHL
t
PLH
t
PZL
t
PZH
t
PHZ
t
PLZ
t
OSHL
t
OSLH
Parameter
Propagation Delay
Data to Output
Output Enable Time
Output Disable Time
Output to Output
Skew Data to Output (Note 14)
Note 13:
Voltage Range 5.0 is 5.0V
±
0.5V.
Voltage Range 3.3 is 3.3V
±
0.3V.
Note 14:
Skew is defined as the absolute value of the difference between the actual propagation delay for any two separate outputs of the same device. The
specification applies to any outputs switching in the same direction, either HIGH to LOW (t
OSHL
) or LOW to HIGH (t
OSLH
). Parameter guaranteed by design.
T
A
= +25°C
C
L
=
50 pF
Min
2.0
1.5
2.5
1.5
1.0
1.0
Typ
7.0
5.0
8.0
6.5
9.0
7.5
1.0
0.5
Max
9.0
6.0
12.0
8.0
13.5
9.0
1.5
1.0
T
A
= −40°C
to
+85°C
C
L
=
50 pF
Min
2.0
1.5
2.5
1.5
1.0
1.0
Max
9.5
6.5
12.5
8.5
14.0
9.5
1.5
1.0
ns
ns
ns
ns
Units
(V)
(Note 13)
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
AC Electrical Characteristics for ACTQ
V
CC
Symbol
t
PHL
t
PLH
t
PZL
t
PZH
t
PHZ
t
PLZ
t
OSHL
t
OSLH
Output to Output
Skew Data to Output (Note 16)
5.0
0.5
1.0
1.0
ns
Output Disable Time
5.0
1.0
8.0
9.5
1.0
10.0
ns
Parameter
Propagation Delay
Data to Output
Output Enable Time
5.0
1.5
7.0
8.5
1.5
9.0
ns
(V)
(Note 15)
5.0
Min
1.5
T
A
= +25°C
C
L
=
50 pF
Typ
5.5
Max
6.5
T
A
= −40°C
to
+85°C
C
L
=
50 pF
Min
1.5
Max
7.0
ns
Units
Note 15:
Voltage Range 5.0 is 5.0V
±
0.5V.
Note 16:
Skew is defined as the absolute value of the difference between the actual propagation delay for any two separate outputs of the same device. The
specification applies to any outputs switching in the same direction, either HIGH to LOW (t
OSHL
) or LOW to HIGH (t
OSLH
). Parameter guaranteed by design.
Capacitance
Symbol
C
IN
C
PD
Parameter
Input Capacitance
Power Dissipation Capacitance
Typ
4.5
70
Units
pF
pF
V
CC
=
OPEN
V
CC
=
5.0V
Conditions
5
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