74LVT2244 [NSC]
3.3V ABT Octal Buffer/Line Driver with TRI-STATE Outputs; 3.3V ABT八路缓冲器/带三态输出线路驱动器
| 型号： | 74LVT2244 |
| 厂家： | 
National Semiconductor |
| 描述： | 3.3V ABT Octal Buffer/Line Driver with TRI-STATE Outputs |
| 文件： | 总8页 (文件大小：143K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
ADVANCE INFORMATION
December 1996
74LVT2244
3.3V ABT Octal Buffer/Line Driver
with TRI-STATE Outputs
É
General Description
Features
Y
Input and output interface capability to systems at 5V
V
The LVT2244 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 im-
proved PC board density. The equivalent 25X-Series resis-
tor helps reduce output overshoot and undershoot.
CC
Y
Bus-Hold data inputs eliminate the need for external
pull-up resistors to hold unused inputs
Equivalent 25X-Series resistor on outputs
Live insertion/extraction permitted
Y
Y
Y
These octal buffers and line drivers are designed for low-
applications, but with the capability to
voltage (3.3V) V
Power Up/Down high impedance provides glitch-free
bus loading
CC
provide a TTL interface to a 5V environment. The LVT2244
is fabricated with an advanced BiCMOS technology to
achieve high speed operation similar to 5V ABT while main-
taining a low power dissipation.
Y
Y
b
a
Outputs source/sink 12 mA/ 12 mA
Available in SOIC JEDEC, SOIC EIAJ, TSSOP and
SSOPII
Y
Latch-up performance exceeds 500 mA
Logic Symbol
Connection Diagram
Pin Assignment
for SOIC, TSSOP and SSOPII
IEEE/IEC
TL/F/12170–2
TL/F/12170–1
Truth Tables
Inputs
Outputs
Inputs
Outputs
(Pins 12, 14, 16, 18)
(Pins 3, 5, 7, 9)
OE
1
I
OE
2
I
n
n
L
L
L
L
H
Z
L
L
L
L
H
Z
H
X
H
X
H
H
e
e
e
e
Z High Impedance
H
HIGH Voltage Level
L
LOW Voltage Level
X
Immaterial
Pin Names
OE , OE
Description
SOIC JEDEC
74LVT2244WM 74LVT2244SJ 74LVT2244MTC 74LVT2244MSA
Number 74LVT2244WMX 74LVT2244SJX 74LVT2244MTCX 74LVT2244MSAX
SOIC EIAJ
TSSOP JEDEC
SSOPII
TRI-STATE Output
Enable Inputs
Inputs
Order
1
2
I –I
0
7
See NS
Package
Number
M20B
M20D
MTC20
MSA20
O –O
0
Outputs
7
TRI-STATEÉ is a registered trademark of National Semiconductor Corporation.
C
1996 National Semiconductor Corporation
TL/F/12170
RRD-B30M17/Printed in U. S. A.
http://www.national.com
Absolute Maximum Ratings (Note 1)
Symbol
Parameter
Supply Voltage
Value
Conditions
Units
V
b
b
b
b
a
0.5 to 7.0
V
V
V
CC
a
0.5 to 7.0
DC Input Voltage
V
I
a
0.5 to 7.0
DC Output Voltage
Output in TRI-STATE
V
O
a
0.5 to 7.0
Output in High or Low State (Note 2)
V
k
b
b
I
I
I
DC Input Diode Current
DC Output Diode Current
DC Output Current
50
50
V
V
V
V
GND
mA
mA
IK
I
k
GND
OK
O
O
O
O
l
l
64
128
V
V
Output at High State
Output at Low State
CC
mA
CC
g
I
I
DC Supply Current per Supply Pin
DC Ground Current per Ground Pin
Storage Temperature
64
mA
mA
CC
g
128
GND
b
a
65 to 150
T
C
§
STG
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’’ table are not guaranteed at the Absolute Maximum Ratings. The ‘‘Recommended Operating
Conditions’’ table will define the conditions for actual device operation.
Note 2: I Absolute Maximum Rating must be observed.
O
Recommended Operating Conditions
Symbol
Parameter
Min
Max
Units
V
Supply Voltage
Operating
2.0
1.5
3.6
3.6
CC
V
V
V
Data Retention
V
V
Input Voltage
0
3.6
I
Output Voltage
HIGH or LOW State
TRI-STATE
0
0
V
CC
5.5
O
b
12
I
I
High-Level Output Current
Low-Level Output Current
Free-Air Operating Temperature
OH
mA
12
85
10
OL
b
T
40
C
§
ns/V
A
e
e
3.0V
Dt/DV
Input Edge Rate, V
IN
0.8V–2.0V, V
CC
0
DC Electrical Characteristics
eb
a
40 C to 85 C
T
§
§
A
V
CC
Symbol
Parameter
Units
Conditions
Typ
(Note 3)
(V)
Min
Max
b
e b
18 mA
V
V
V
V
Input Clamp Diode Voltage
Input HIGH Voltage
2.7
2.7–3.6
2.7–3.6
2.7–3.6
3.0
1.2
V
V
I
IK
I
s
t
V
V
0.1V or
b
2.0
O
IH
IL
V
0.1V
O
CC
Input LOW Voltage
0.8
b
e b
e b
Output HIGH Voltage
V
CC
0.2
V
V
V
V
I
I
I
I
100 mA
OH
OH
OH
OL
OL
2.0
12 mA
e
e
V
OL
Output LOW Voltage
2.7
0.2
0.8
100 mA
12 mA
3.0
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2
DC Electrical Characteristics (Continued)
eb
a
40 C to 85 C
T
§
§
A
V
CC
Symbol
Parameter
Units
Conditions
Typ
(Note 3)
(V)
Min
Max
e
e
I
I
I
Bus-Hold Input Minimum Drive
3.0
75
mA
mA
mA
mA
mA
mA
mA
mA
mA
V
V
0.8V
2.0V
I(HOLD)
I
b
75
500
I
Bus-Hold Input Over-Drive
Current to Change State
3.0
(Note 4)
(Note 5)
I(OD)
I
b
500
e
e
e
e
Input Current
3.6
3.6
3.6
10
V
I
V
I
V
I
V
I
5.5V
0V or V
0V
g
b
Control Pins
Data Pins
1
5
CC
1
V
CC
s
0V V or V
s
5.5V
g
g
I
I
Power Off Leakage Current
Power up/down TRI-STATE
0
100
OFF
I
O
e
V
V
0.5V to V
CC
PU/PD
O
0–1.2V
100
mA
e
(Note 6) Output Current
GND or V
CC
I
b
e
I
I
I
I
I
I
I
TRI-STATE Output Leakage Current
3.6
3.6
3.6
3.6
3.6
3.6
5
mA
mA
mA
mA
mA
mA
V
V
V
0.5V
3.0V
OZL
OZH
OZH
CCH
CCL
CCZ
CCZ
O
O
e
TRI-STATE Output Leakage Current
TRI-STATE Output Leakage Current
Power Supply Current
5
a
a
k
s
5.5V
10
0.19
12
V
O
CC
Outputs High
Outputs Low
Power Supply Current
Power Supply Current
0.19
Outputs Disabled
s
s
V
O
Power Supply Current
V
5.5V,
CC
3.6
3.6
0.19
0.2
mA
mA
Outputs Disabled
b
0.6V
DI
Increase in Power Supply Current
(Note 7)
One Input at V
CC
CC
Other Inputs at V or GND
CC
e
e
25 C.
Note 3: All typical values are at V
3.3V, T
§
CC
A
Note 4: An external driver must source at least the specified current to switch from LOW to HIGH.
Note 5: An external driver must sink at least the specified current to switch from HIGH to LOW.
Note 6: This parameter is valid for any V
CC
between 0V and 1.2V at 25 C only.
§
Note 7: This is the increase in supply current for each input that is at the specified voltage level rather than V
or GND.
CC
Dynamic Switching Characteristics (Note 8)
e
T
25 C
§
V
Conditions
A
CC
Symbol
Parameter
Units
e
e
500X
(V)
C
L
50 pF, R
L
Min
Typ
Max
V
V
Quiet Output Maximum Dynamic V
3.3
3.3
0.8
V
V
(Note 9)
(Note 9)
OLP
OL
b
Quiet Output Minimum Dynamic V
0.8
OLV
OL
Note 8: Characterized in SOIC package. Guaranteed parameter, but not tested.
b
Note 9: Max number of outputs defined as (n). n 1 data inputs are driven 0V to 3V. Output under test held LOW.
3
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AC Electrical Characteristics
e b
e
a
T
40 C to 85 C
§
§
50 pF, R
A
e
C
500X
L
L
e
e
CC
Symbol
Parameter
Units
g
3.3V 0.3V
V
V
2.7V
Max
CC
Typ
Min
Max
Min
(Note 3)
t
t
Propagation Delay Data to Output
Output Enable Time
1.0
1.0
4.1
4.1
1.0
1.0
5.0
5.2
PLH
ns
ns
ns
ns
PHL
t
t
1.0
1.0
5.2
5.2
1.0
1.0
6.3
6.7
PZH
PZL
t
t
Output Disable Time
1.8
1.8
5.6
5.1
1.8
1.8
6.3
5.6
PHZ
PLZ
t
t
Output to Output Skew
(Note 10)
OSHL
1.0
OSLH
e
e
25 C.
Note 3: All typical values are at V
3.3V, T
§
Note 10: 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
CC
A
specification applies to any outputs switching in the same direction, either HIGH to LOW (t
) or LOW to HIGH (t
). Parameter guaranteed by design.
OSLH
OSHL
Capacitance (Note 11)
Symbol
Parameter
Min
Typ
4
Max
Units
pF
Conditions
e
e
e
0V or V
C
C
Input Capacitance
Output Capacitance
V
V
0V, V
IN
CC
I
CC
e
8
pF
3.0V, V
0V or V
CC
OUT
CC
O
e
Note 11: Capacitance is measured at frequency f
1 MHz, per MIL-STD-883B, Method 3012.
74LVT2244 Ordering Information
The device number is used to form part of a simplified purchasing code where the package type and temperature range are
defined as follows:
TL/F/12170–3
http://www.national.com
4
Physical Dimensions inches (millimeters) unless otherwise noted
20-Lead (0.300 Wide) Molded Small Outline Package, JEDEC
×
Order Number 74LVT2244WM or 74LVT2244WMX
NS Package Number M20B
5
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Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
20-Lead (0.300 Wide) Molded Small Outline Package, EIAJ
×
Order Number 74LVT2244SJ or 74LVT2244SJX
NS Package Number M20D
http://www.national.com
6
Physical Dimensions millimeters (Continued)
20-Lead Molded Shrink Small Outline Package, EIAJ Type II
Order Number 74LVT2244MSA or 74LVT2244MSAX
NS Package Number MSA20
7
http://www.national.com
Physical Dimensions millimeters (Continued)
20-Lead Molded Thin Shrink Small Outline Package, JEDEC
Order Number 74LVT2244MTC or 74LVT2244MTCX
NS Package Number MTC20
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failure to perform, when properly used in accordance
with instructions for use provided in the labeling, can
be reasonably expected to result in a significant injury
to the user.
2. A critical component is any component of a life
support device or system whose failure to perform can
be reasonably expected to cause the failure of the life
support device or system, or to affect its safety or
effectiveness.
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