74LCX240 [NSC]
Low-Voltage Octal Buffer/Line Driver with 5V Tolerant Inputs and Outputs; 具有5V容限输入和输出低电压八路缓冲器/线路驱动器
| 型号： | 74LCX240 |
| 厂家： | 
National Semiconductor |
| 描述： | Low-Voltage Octal Buffer/Line Driver with 5V Tolerant Inputs and Outputs |
| 文件： | 总6页 (文件大小：119K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
December 1996
74LCX240
Low-Voltage Octal Buffer/Line Driver
with 5V Tolerant Inputs and Outputs
Y
Power-down high impedance inputs and outputs
General Description
The LCX240 is an inverting octal buffer and line driver de-
signed to be employed as a memory address driver, clock
driver and bus oriented transmitter or receiver. The device is
designed for low voltage (3.3V) V applications with capa-
CC
bility of interfacing to a 5V signal environment.
Y
Y
Y
Y
Supports live insertion/withdrawal
2.0V–3.6V V supply operation
CC
24 mA output drive
g
Implements patented Quiet SeriesTM noise/EMI
reduction circuitry
Y
Y
Y
Functionally compatible with the 74 series 240
Latch-up performance exceeds 500 mA
ESD performance:
The LCX240 is fabricated with an advanced CMOS technol-
ogy to achieve high speed operation while maintaining
CMOS low power dissipation.
l
200V
Human Body Model
l
2000V
Machine Model
Features
Y
5V tolerant inputs and outputs
Y
6.5 ns t
max, 10 mA I max
CCQ
PD
Logic Symbol
Connection Diagram
Pin Assignment
for SOIC, SSOP and TSSOP
IEEE/IEC
TL/F/11993–2
TL/F/11993–1
Pin Names
Description
OE , OE
1
TRI-STATE Output Enable Inputs
É
Inputs
Outputs
2
I –I
0
7
O –O
0
7
Truth Tables
Inputs
Inputs
Outputs
(Pins 12, 14, 16, 18)
Outputs
(Pins 3, 5, 7, 9)
OE
1
I
OE
2
I
n
n
L
L
H
L
H
X
H
L
Z
L
L
H
L
H
X
H
L
Z
e
e
e
e
Z High Impedance
H
HIGH Voltage Level
L
LOW Voltage Level
X
Immaterial
SOIC JEDEC
74LCX240WM
74LCX240WMX 74LCX240SJX 74LCX240MSAX 74LCX240MTCX
SOIC EIAJ
SSOP Type II
TSSOP
Order Number
74LCX240SJ
74LCX240MSA
74LCX240MTC
See NS Package Number
M20B
M20D
MSA20
MTC20
TRI-STATEÉ is a registered trademark of National Semiconductor Corporation.
Quiet SeriesTM is a trademark of National Semiconductor Corporation.
C
1996 National Semiconductor Corporation
TL/F/11993
RRD-B30M17/Printed in U. S. A.
http://www.national.com
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Symbol
Parameter
Supply Voltage
Value
Conditions
Units
V
b
a
0.5 to 7.0
V
V
V
CC
b
a
0.5 to 7.0
DC Input Voltage
V
I
b
a
0.5 to 7.0
DC Output Voltage
Output in TRI-STATE
V
O
b
a
0.5
0.5 to V
Output in High or Low State (Note 2)
V
CC
k
b
I
I
DC Input Diode Current
DC Output Diode Current
50
V
GND
mA
IK
I
k
GND
b
a
50
50
V
V
OK
O
mA
l
V
CC
O
g
I
I
I
DC Output Source/Sink Current
DC Supply Current per Supply Pin
DC Ground Current per Ground Pin
Storage Temperature
50
mA
mA
mA
O
g
g
100
100
CC
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
5.5
I
Output Voltage
HIGH or LOW State
TRI-STATE
0
0
V
CC
5.5
O
e
V
g
g
I
/I
OH OL
Output Current
V
CC
3.0V–3.6V
e
24
12
mA
2.7V
CC
b
T
Free-Air Operating Temperature
40
85
10
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
e b
A
a
40 C to 85 C
V
CC
(V)
T
§
§
Max
Symbol
Parameter
Conditions
Units
Min
V
V
V
HIGH Level Input Voltage
LOW Level Input Voltage
HIGH Level Output Voltage
2.7–3.6
2.7–3.6
2.7–3.6
2.7
2.0
V
V
IH
0.8
IL
e b
e b
e b
e b
b
I
I
I
I
I
I
I
I
100 mA
12 mA
18 mA
24 mA
V
CC
0.2
V
OH
OH
OH
OH
OH
OL
OL
OL
2.2
2.4
2.2
V
3.0
V
3.0
V
e
e
e
e
V
OL
LOW Level Output Voltage
100 mA
2.7–3.6
2.7
0.2
0.4
V
12 mA
16 mA
24 mA
V
3.0
0.4
V
3.0
0.55
V
OL
s
s
g
g
I
I
Input Leakage Current
0
V
5.5V
2.7–3.6
5.0
5.0
mA
I
I
s
s
5.5V
or V
TRI-STATE Output Leakage
0
V
V
V
OZ
O
2.7–3.6
mA
e
I
IH
IL
e
V or V
O
I
I
Power-Off Leakage Current
Quiescent Supply Current
5.5V
0
10
10
mA
mA
mA
mA
OFF
CC
I
e
V
I
V
CC
or GND
2.7–3.6
2.7–3.6
2.7–3.6
s
3.6V V , V
s
g
5.5V
10
I
O
e
b
0.6V
DI
Increase in I per Input
CC
V
IH
V
CC
500
CC
http://www.national.com
2
AC Electrical Characteristics
e b
a
40 C to 85 C
T
A
§
§
e
e
CC
Symbol
Parameter
Units
g
V
3.3V 0.3V
Max
V
2.7V
Max
CC
Min
Min
t
t
Propagation Delay
1.5
1.5
6.5
6.5
1.5
1.5
7.5
7.5
PHL
ns
ns
ns
ns
Data to Output
PLH
t
t
Output Enable Time
1.5
1.5
8.0
8.0
1.5
1.5
9.0
9.0
PZL
PZH
t
t
Output Disable Time
1.5
1.5
7.0
7.0
1.5
1.5
8.0
8.0
PLZ
PHZ
t
t
Output to Output Skew (Note 1)
1.0
1.0
OSHL
OSLH
Note 1: 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
) or LOW to HIGH (t
).
OSLH
OSHL
Dynamic Switching Characteristics
e
T
25 C
§
V
A
CC
Symbol
Parameter
Conditions
Units
(V)
Typical
e
e
e
e
e
e
V
V
Quiet Output Dynamic Peak V
C
C
50 pF, V
50 pF, V
3.3V, V
3.3V, V
0V
0V
3.3
3.3
0.8
V
V
OLP
OL
L
IH
IL
b
Quiet Output Dynamic Valley V
OL
0.8
OLV
L
IH
IL
Capacitance
Symbol
Parameter
Input Capacitance
Output Capacitance
Power Dissipation Capacitance
Conditions
Typical
Units
pF
e
e
e
e
0V or V
C
C
C
V
Open, V
7
8
IN
CC
CC
CC
I
CC
e
V
3.3V, V
0V or V
CC
pF
OUT
PD
I
I
e
e
10 MHz
V
3.3V, V
0V or V , F
CC
25
pF
3
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74LCX240 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/11993–3
Physical Dimensions inches (millimeters) unless otherwise noted
20-Lead Small Outline Integrated Circuit
Order Number 74LCX240WM or 74LCX240WMX
NS Package Number M20B
http://www.national.com
4
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
20-Lead Small Outline Package, EIAJ (SJ)
Order Number 74LCX240SJ or 74LCX240SJX
NS Package Number M20D
All dimensions are in millimeters.
20-Lead Molded Shrink Small Outline Package, EIAJ, Type II
Order Number 74LCX240MSA or 74LCX240MSAX
NS Package Number MSA20
5
http://www.national.com
Physical Dimensions All dimensions are in millimeters (Continued)
20-Lead Thin Shrink Small Outline Package, JEDEC
Order Number 74LCX240MTC or 74LCX240MTCX
NS Package Number MTC20
LIFE SUPPORT POLICY
NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL
SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or
systems which, (a) are intended for surgical implant
into the body, or (b) support or sustain life, and whose
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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Corporation
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a
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