74LVQ244 Low Voltage Octal Buffer/Line Driver with 3-STATE Outputs
February 1992
Revised June 2001
74LVQ244
Low Voltage Octal Buffer/Line Driver
with 3-STATE Outputs
General Description
The LVQ244 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.
Features
s
Ideal for low power/low noise 3.3V applications
s
Implements patented EMI reduction circuitry
s
Available in SOIC JEDEC, SOIC EIAJ and QSOP pack-
ages
s
Guaranteed simultaneous switching noise level and
dynamic threshold performance
s
Improved latch-up immunity
s
Guaranteed incident wave switching into 75
Ω
s
4 kV minimum ESD immunity
Ordering Code:
Order Number
74LVQ244SC
74LVQ244SJ
74LVQ244QSC
Package Number
M20B
M20D
MQA20
Package Description
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide
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
Device also available in Tape and Reel. Specify by appending suffix letter “X” to the ordering code.
Logic Symbol
IEEE/IEC
Connection Diagram
Truth Tables
Inputs
OE
1
I
n
L
H
X
Outputs
(Pins 12, 14, 16, 18)
L
H
Z
Outputs
(Pins 3, 5, 7, 9)
L
H
Z
Pin Descriptions
Pin Names
OE
1
, OE
2
I
0
–I
7
O
0
–O
7
Description
3-STATE Output Enable Inputs
Inputs
Outputs
L
L
H
Inputs
OE
2
L
L
H
H
=
HIGH Voltage Level
X
=
Immaterial
I
n
L
H
X
L
=
LOW Voltage Level
Z
=
High Impedance
© 2001 Fairchild Semiconductor Corporation
DS011356
www.fairchildsemi.com
74LVQ244
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
(I
CC
or I
GND
)
Storage Temperature (T
STG
)
DC Latch-Up Source or
Sink Current
−
0.5V to
+
7.0V
−
20 mA
+
20 mA
−
0.5V to V
CC
+
0.5V
−
20 mA
+
20 mA
−
0.5V to V
CC
+
0.5V
±
50 mA
±
400 mA
−
65
°
C to
+
150
°
C
±
300 mA
Recommended Operating
Conditions
(Note 2)
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
@ 3.0V
125 mV/ns
2.0V to 3.6V
0V to V
CC
0V to V
CC
−
40
°
C to
+
85
°
C
Note 1:
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.
Note 2:
Unused inputs must be held HIGH or LOW. They may not float.
DC Electrical Characteristics
Symbol
V
IH
V
IL
V
OH
Parameter
Minimum High Level
Input Voltage
Maximum Low Level
Input Voltage
Minimum High Level
Output Voltage
V
OL
Maximum Low Level
Output Voltage
I
IN
I
OLD
I
OHD
I
CC
Maximum Input Leakage Current
Minimum Dynamic (Note 4)
Output Current
Maximum Quiescent
Supply Current
I
OZ
Maximum 3-STATE
Leakage Current
V
OLP
V
OLV
V
IHD
V
ILD
Quiet Output
Maximum Dynamic V
OL
Quiet Output
Minimum Dynamic V
OL
Minimum High Level
Dynamic Input Voltage
Maximum Low Level
Dynamic Input Voltage
3.6
±0.25
±2.5
µA
V
CC
(V)
3.0
3.0
3.0
3.0
3.0
3.0
3.6
3.6
3.6
3.6
4.0
0.002
T
A
= +25°C
Typ
1.5
1.5
2.99
2.0
0.8
2.9
2.58
0.1
0.36
±0.1
T
A
= −40°C
to
+85°C
Guaranteed Limits
2.0
0.8
2.9
2.48
0.1
0.44
±1.0
36
−25
40.0
V
V
V
V
V
V
µA
mA
mA
µA
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
(Note 3)
I
OH
= −12
mA
I
OUT
=
50
µA
V
IN
=
V
IL
or V
IH
(Note 3)
I
OL
=
12 mA
V
I
=
V
CC
, GND
V
OLD
=
0.8V Max (Note 5)
V
OHD
=
2.0V Min (Note 5)
V
IN
=
V
CC
or GND
V
I
(OE)
=
V
IL
, V
IH
V
I
=
V
CC
, GND
V
O
=
V
CC
, GND
3.3
3.3
3.3
3.3
0.4
−0.4
1.7
1.7
0.8
−0.8
2.0
0.8
V
V
V
V
(Note 6)(Note 7)
(Note 6)(Note 7)
(Note 6)(Note 8)
(Note 6)(Note 8)
Units
Conditions
Note 3:
All outputs loaded thresholds on input associated with output under test.
Note 4:
Maximum test duration 2.0 ms, one output loaded at a time.
Note 5:
Incident wave switching on transmission lines with impedances as low as 75Ω for commercial temperature range is guaranteed for 74LVQ.
Note 6:
Worst case package.
Note 7:
Max number of outputs defined as (n). Data inputs are driven 0V to 3.3V; one output at GND.
Note 8:
Max number of Data Inputs (n) switching. (n
−
1) inputs switching 0V to 3.3V. Input-under-test switching: 3.3V to threshold (V
ILD
), 0V to threshold
(V
IHD
), f
=
1 MHz.
www.fairchildsemi.com
2
74LVQ244
AC Electrical Characteristics
T
A
= +25°C
Symbol
Parameter
V
CC
(V)
t
PHL
t
PLH
t
PZL
t
PZH
t
PHZ
t
PLZ
t
OSHL
t
OSLH
Output to Output
Skew Data to Output (Note 9)
Output Disable Time
Propagation Delay
Data to Output
Output Enable Time
2.7
3.3
±
0.3
2.7
3.3
±
0.3
2.7
3.3
±
0.3
2.7
3.3
±
0.3
Min
2.0
2.0
2.5
2.5
1.0
1.0
C
L
=
50 pF
Typ
8.4
7.0
9.6
8.0
10.8
9.0
1.0
1.0
Max
12.7
9.0
16.9
12.0
19.0
13.5
1.5
1.5
T
A
= −40°C
to
+85°C
C
L
=
50 pF
Min
2.0
2.0
2.5
2.5
1.0
1.0
Max
14.0
9.5
18.0
12.5
20.0
14.0
1.5
1.5
ns
ns
ns
ns
Units
Note 9:
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
(Note 10)
Parameter
Input Capacitance
Power Dissipation Capacitance
Typ
4.5
70
Units
pF
pF
V
CC
=
Open
V
CC
=
3.3V
Conditions
Note 10:
C
PD
is measured at 10 MHz.
3
www.fairchildsemi.com
74LVQ244
Physical Dimensions
inches (millimeters) unless otherwise noted
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide
Package Number M20B
www.fairchildsemi.com
4
74LVQ244
Physical Dimensions
inches (millimeters) unless otherwise noted (Continued)
20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
Package Number M20D
5
www.fairchildsemi.com
微控制器 MCU
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
