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MC74LCX240
Low−Voltage CMOS
Octal Buffer
With 5 V−Tolerant Inputs and Outputs
(3−State, Inverting)
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The MC74LCX240 is a high performance, inverting octal buffer
operating from a 2.3 to 3.6 V supply. High impedance TTL compatible
inputs significantly reduce current loading to input drivers while TTL
compatible outputs offer improved switching noise performance. A V
I
specification of 5.5 V allows MC74LCX240 inputs to be safely driven
from 5 V devices. The MC74LCX240 is suitable for memory address
driving and all TTL level bus oriented transceiver applications.
Current drive capability is 24 mA at the outputs. The Output Enable
(OE) input, when HIGH, disables the outputs by placing them in a
HIGH Z condition.
Features
MARKING
DIAGRAMS
20
SOIC−20
DW SUFFIX
CASE 751D
1
LCX240
AWLYYWWG
20
1
•
•
•
•
•
•
•
•
Designed for 2.3 to 3.6 V V
CC
Operation
5 V Tolerant − Interface Capability With 5 V TTL Logic
Supports Live Insertion and Withdrawal
I
OFF
Specification Guarantees High Impedance When V
CC
= 0 V
LVTTL Compatible
LVCMOS Compatible
24 mA Balanced Output Sink and Source Capability
Near Zero Static Supply Current in All Three Logic States (10
mA)
Substantially Reduces System Power Requirements
•
Latchup Performance Exceeds 500 mA
•
ESD Performance:
Human Body Model >2000 V
Machine Model >200 V
•
Pb−Free Packages are Available*
20
TSSOP−20
DT SUFFIX
CASE 948E
1
LCX
240
ALYWG
G
20
1
A
= Assembly Location
L, WL
= Wafer Lot
Y, YY
= Year
W, WW = Work Week
G or
G
= Pb−Free Package
(Note: Microdot may be in either location)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 3 of this data sheet.
*For additional information on our Pb−Free strategy and soldering details, please
download the ON Semiconductor Soldering and Mounting Techniques
Reference Manual, SOLDERRM/D.
©
Semiconductor Components Industries, LLC, 2006
1
March, 2006 − Rev. 7
Publication Order Number:
MC74LCX240/D
MC74LCX240
1OE
V
CC
20
2OE
19
1O0
18
2D0
17
1O1
16
2D1
15
1O2
14
2D2
13
1O3
12
2D3
11
1D0
1D1
1D2
1
1OE
2
1D0
3
2O0
4
1D1
5
2O1
6
1D2
7
2O2
8
1D3
9
2O3
10
GND
1D3
1
2
4
6
8
18
16
14
12
1O0
1O1
1O2
1O3
Figure 1. Pinout: 20−Lead
(Top View)
2OE
2D0
19
17
15
13
11
3
5
7
9
2O0
2O1
2O2
2O3
PIN NAMES
Pins
nOE
1Dn, 2Dn
1On, 2On
Function
Output Enable Inputs
Data Inputs
3−State Outputs
2D1
2D2
2D3
Figure 2. LOGIC DIAGRAM
TRUTH TABLE
INPUTS
1OE
2OE
L
L
H
H
L
Z
X
=
=
=
=
1Dn
2Dn
L
H
X
OUTPUTS
1On, 2On
H
L
Z
High Voltage Level
Low Voltage Level
High Impedance State
High or Low Voltage Level and Transitions Are Acceptable; for I
CC
reasons, DO NOT FLOAT Inputs
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2
MC74LCX240
MAXIMUM RATINGS
Symbol
V
CC
V
I
V
O
I
IK
I
OK
I
O
I
CC
I
GND
Parameter
DC Supply Voltage
DC Input Voltage
DC Output Voltage
DC Input Diode Current
DC Output Diode Current
DC Output Source/Sink Current
DC Supply Current Per Supply Pin
DC Ground Current Per Ground Pin
Value
−0.5 to +7.0
−0.5
≤
V
I
≤
+7.0
−0.5
≤
V
O
≤
+7.0
−0.5
≤
V
O
≤
V
CC
+ 0.5
−50
−50
+50
±50
±100
±100
Output in 3−State
Note 1
V
I
< GND
V
O
< GND
V
O
> V
CC
Condition
Unit
V
V
V
V
mA
mA
mA
mA
mA
mA
T
STG
Storage Temperature Range
−65 to +150
°C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
1. Output in HIGH or LOW State. I
O
absolute maximum rating must be observed.
RECOMMENDED OPERATING CONDITIONS
Symbol
V
CC
V
I
V
O
I
OH
I
OL
I
OH
I
OL
T
A
Dt/DV
Supply Voltage
Input Voltage
Output Voltage
(HIGH or LOW State)
(3−State)
Parameter
Operating
Data Retention Only
Min
2.0
1.5
0
0
0
Typ
3.3
3.3
Max
3.6
3.6
5.5
V
CC
5.5
−24
24
−12
12
−40
0
+85
10
Unit
V
V
V
mA
mA
mA
mA
°C
ns/V
HIGH Level Output Current, V
CC
= 3.0 V − 3.6 V
LOW Level Output Current, V
CC
= 3.0 V − 3.6 V
HIGH Level Output Current, V
CC
= 2.7 V − 3.0 V
LOW Level Output Current, V
CC
= 2.7 V − 3.0 V
Operating Free−Air Temperature
Input Transition Rise or Fall Rate, V
IN
from 0.8 V to 2.0 V,
V
CC
= 3.0 V
ORDERING INFORMATION
Device
MC74LCX240DT
MC74LCX240DTR2
MC74LCX240DTR2G
MC74LCX240DWR2
MC74LCX240DWR2G
Package
TSSOP−20*
TSSOP−20*
TSSOP−20*
SOIC−20
SOIC−20
(Pb−Free)
Shipping
†
75 Units / Rail
2000 Tape & Reel
2000 Tape & Reel
1000 Tape & Reel
1000 Tape & Reel
†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
*This package is inherently Pb−Free.
DC ELECTRICAL CHARACTERISTICS
T
A
= −40°C to +85°C
Symbol
V
IH
V
IL
V
OH
Characteristic
HIGH Level Input Voltage (Note 2)
LOW Level Input Voltage (Note 2)
HIGH Level Output Voltage
Condition
2.7 V
≤
V
CC
≤
3.6 V
2.7 V
≤
V
CC
≤
3.6 V
2.7 V
≤
V
CC
≤
3.6 V; I
OH
= −100
mA
V
CC
= 2.7 V; I
OH
= −12 mA
V
CC
= 3.0 V; I
OH
= −18 mA
V
CC
= 3.0 V; I
OH
= −24 mA
2. These values of V
I
are used to test DC electrical characteristics only.
V
CC
− 0.2
2.2
2.4
2.2
Min
2.0
0.8
Max
Unit
V
V
V
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3
MC74LCX240
DC ELECTRICAL CHARACTERISTICS
(Continued)
T
A
= −40°C to +85°C
Symbol
V
OL
Characteristic
LOW Level Output Voltage
Condition
2.7 V
≤
V
CC
≤
3.6 V; I
OL
= 100
mA
V
CC
= 2.7 V; I
OL
= 12 mA
V
CC
= 3.0 V; I
OL
= 16 mA
V
CC
= 3.0 V; I
OL
= 24 mA
I
I
I
OZ
I
OFF
I
CC
DI
CC
Input Leakage Current
3−State Output Current
Power−Off Leakage Current
Quiescent Supply Current
2.7 V
≤
V
CC
≤
3.6 V; 0 V
≤
V
I
≤
5.5 V
2.7
≤
V
CC
≤
3.6 V; 0V
≤
V
O
≤
5.5 V;
V
I
= V
IH
or V
IL
V
CC
= 0 V; V
I
or V
O
= 5.5 V
2.7
≤
V
CC
≤
3.6 V; V
I
= GND or V
CC
2.7
≤
V
CC
≤
3.6 V; 3.6
≤
V
I
or V
O
≤
5.5 V
Increase in I
CC
per Input
2.7
≤
V
CC
≤
3.6 V; V
IH
= V
CC
− 0.6 V
Min
Max
0.2
0.4
0.4
0.55
±5.0
±5.0
10
10
±10
500
mA
mA
mA
mA
mA
mA
Unit
V
AC CHARACTERISTICS
(t
R
= t
F
= 2.5 ns; C
L
= 50 pF; R
L
= 500
W)
Limits
T
A
= −40°C to +85°C
V
CC
= 3.0 V to 3.6 V
Symbol
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
t
OSHL
t
OSLH
Parameter
Propagation Delay
Input to Output
Output Enable Time to
High and Low Level
Output Disable Time From
High and Low Level
Output−to−Output Skew
(Note 3)
Waveform
1
2
2
Min
1.5
1.5
1.5
1.5
1.5
1.5
Max
6.5
6.5
8.0
8.0
7.0
7.0
1.0
1.0
V
CC
= 2.7 V
Max
7.5
7.5
9.0
9.0
8.0
8.0
Unit
ns
ns
ns
ns
3. 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.
DYNAMIC SWITCHING CHARACTERISTICS
T
A
= +25°C
Symbol
V
OLP
V
OLV
Characteristic
Dynamic LOW Peak Voltage (Note 4)
Dynamic LOW Valley Voltage (Note 4)
Condition
V
CC
= 3.3 V, C
L
= 50 pF, V
IH
= 3.3 V, V
IL
= 0 V
V
CC
= 3.3 V, C
L
= 50 pF, V
IH
= 3.3 V, V
IL
= 0 V
Min
Typ
0.8
0.8
Max
Unit
V
V
4. Number of outputs defined as “n”. Measured with “n−1” outputs switching from HIGH−to−LOW or LOW−to−HIGH. The remaining output is
measured in the LOW state.
CAPACITIVE CHARACTERISTICS
Symbol
C
IN
C
OUT
C
PD
Parameter
Input Capacitance
Output Capacitance
Power Dissipation Capacitance
Condition
V
CC
= 3.3 V, V
I
= 0 V or V
CC
V
CC
= 3.3 V, V
I
= 0 V or V
CC
10 MHz, V
CC
= 3.3 V, V
I
= 0 V or V
CC
Typical
7
8
25
Unit
pF
pF
pF
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