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ON Semiconductort
Low-Voltage CMOS
Octal Buffer
With 5 V–Tolerant Inputs and Outputs
(3–State, Inverting)
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 VI
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.
MC74LCX240
LOW–VOLTAGE CMOS
OCTAL BUFFER
•
•
•
•
•
•
•
•
Designed for 2.3 to 3.6 V VCC Operation
5 V Tolerant – Interface Capability With 5 V TTL Logic
Supports Live Insertion and Withdrawal
IOFF Specification Guarantees High Impedance When VCC = 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
µA)
Substantially Reduces System Power Requirements
•
Latchup Performance Exceeds 500 mA
•
ESD Performance: Human Body Model >2000 V; Machine Model
>200 V
20
1
DT SUFFIX
PLASTIC TSSOP
CASE 948E
20
1
DW SUFFIX
PLASTIC SOIC
CASE 751D
20
1
M SUFFIX
PLASTIC SOIC EIAJ
CASE 967
PIN NAMES
Pins
nOE
1Dn, 2Dn
1On, 2On
Function
Output Enable Inputs
Data Inputs
3–State Outputs
©
Semiconductor Components Industries, LLC, 2001
652
May, 2001 – Rev. 6
Publication Order Number:
MC74LCX240/D
MC74LCX240
VCC
20
2OE
19
1O0
18
2D0
17
1O1
16
2D1
15
1O2
14
2D2
13
1O3
12
2D3
11
1
1OE
2
1D0
3
2O0
4
1D1
5
2O1
6
1D2
7
2O2
8
1D3
9
2O3
10
GND
Figure 1. Pinout: 20–Lead
(Top View)
1
2
4
6
8
18
16
14
12
1OE
1D0
1D1
1D2
1D3
1O0
1O1
1O2
1O3
2OE
2D0
2D1
2D2
2D3
19
17
15
13
11
3
5
7
9
2O0
2O1
2O2
2O3
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 ICC reasons, DO NOT FLOAT Inputs
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653
MC74LCX240
MAXIMUM RATINGS
Symbol
VCC
VI
VO
Parameter
DC Supply Voltage
DC Input Voltage
DC Output Voltage
Value
–0.5 to +7.0
–0.5
≤
VI
≤
+7.0
–0.5
≤
VO
≤
+7.0
–0.5
≤
VO
≤
VCC + 0.5
IIK
IOK
DC Input Diode Current
DC Output Diode Current
–50
–50
+50
IO
ICC
IGND
DC Output Source/Sink Current
DC Supply Current Per Supply Pin
DC Ground Current Per Ground Pin
±50
±100
±100
Output in 3–State
Note 1.
VI < GND
VO < GND
VO > VCC
Condition
Unit
V
V
V
V
mA
mA
mA
mA
mA
mA
TSTG
Storage Temperature Range
–65 to +150
°C
Maximum Ratings are those values beyond which damage to the device may occur. Exposure to these conditions or conditions beyond those
indicated may adversely affect device reliability. Functional operation under absolute maximum–rated conditions is not implied. Functional
operation should be restricted to the Recommended Operating Conditions.
1. Output in HIGH or LOW State. IO absolute maximum rating must be observed.
RECOMMENDED OPERATING CONDITIONS
Symbol
VCC
VI
VO
IOH
IOL
IOH
IOL
TA
∆t/∆V
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
VCC
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, VCC = 3.0 V – 3.6 V
LOW Level Output Current, VCC = 3.0 V – 3.6 V
HIGH Level Output Current, VCC = 2.7 V – 3.0 V
LOW Level Output Current, VCC = 2.7 V – 3.0 V
Operating Free–Air Temperature
Input Transition Rise or Fall Rate, VIN from 0.8 V to 2.0 V,
VCC = 3.0 V
DC ELECTRICAL CHARACTERISTICS
TA = –40°C to +85°C
Symbol
VIH
VIL
VOH
Characteristic
HIGH Level Input Voltage (Note 2.)
LOW Level Input Voltage (Note 2.)
HIGH Level Output Voltage
Condition
2.7 V
≤
VCC
≤
3.6 V
2.7 V
≤
VCC
≤
3.6 V
2.7 V
≤
VCC
≤
3.6 V; IOH = –100
µA
VCC = 2.7 V; IOH = –12 mA
VCC = 3.0 V; IOH = –18 mA
VCC = 3.0 V; IOH = –24 mA
VOL
LOW Level Output Voltage
2.7 V
≤
VCC
≤
3.6 V; IOL = 100
µA
VCC = 2.7 V; IOL= 12 mA
VCC = 3.0 V; IOL = 16 mA
VCC = 3.0 V; IOL = 24 mA
2. These values of VI are used to test DC electrical characteristics only.
VCC – 0.2
2.2
2.4
2.2
0.2
0.4
0.4
0.55
V
Min
2.0
0.8
Max
Unit
V
V
V
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654
MC74LCX240
DC ELECTRICAL CHARACTERISTICS
(Continued)
TA = –40°C to +85°C
Symbol
II
IOZ
IOFF
ICC
∆I
CC
Characteristic
Input Leakage Current
3–State Output Current
Power–Off Leakage Current
Quiescent Supply Current
y
Condition
2.7 V
≤
VCC
≤
3.6 V; 0 V
≤
VI
≤
5.5 V
2.7
≤
VCC
≤
3.6 V; 0V
≤
VO
≤
5.5 V;
VI = VIH or V IL
VCC = 0 V; VI or VO = 5.5 V
2.7
≤
VCC
≤
3.6 V; VI = GND or VCC
2.7
≤
VCC
≤
3.6 V; 3.6
≤
VI or VO
≤
5.5 V
Increase in ICC per Input
2.7
≤
VCC
≤
3.6 V; VIH = VCC – 0.6 V
Min
Max
±5.0
±5.0
10
10
±10
500
Unit
µA
µA
µA
µA
µA
µA
AC CHARACTERISTICS
(tR = tF = 2.5 ns; CL = 50 pF; RL = 500
Ω)
Limits
TA = –40°C to +85°C
VCC = 3.0 V to 3.6 V
Symbol
tPLH
tPHL
tPZH
tPZL
tPHZ
tPLZ
tOSHL
tOSLH
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
VCC = 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 (tOSHL) or LOW–to–HIGH (tOSLH); parameter
guaranteed by design.
DYNAMIC SWITCHING CHARACTERISTICS
TA = +25°C
Symbol
VOLP
Characteristic
Dynamic LOW Peak Voltage (Note 4.)
Condition
VCC = 3.3 V, CL = 50 pF, VIH = 3.3 V, VIL = 0 V
Min
Typ
0.8
Max
Unit
V
VOLV
Dynamic LOW Valley Voltage (Note 4.) VCC = 3.3 V, CL = 50 pF, VIH = 3.3 V, VIL = 0 V
0.8
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
CIN
COUT
CPD
Parameter
Input Capacitance
Output Capacitance
Power Dissipation Capacitance
Condition
VCC = 3.3 V, VI = 0 V or VCC
VCC = 3.3 V, VI = 0 V or VCC
10 MHz, VCC = 3.3 V, VI = 0 V or VCC
Typical
7
8
25
Unit
pF
pF
pF
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655
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