MC74VHC240
Octal Bus Buffer/Line Driver
Inverting with 3-State Outputs
The MC74VHC240 is an advanced high speed CMOS octal bus
buffer fabricated with silicon gate CMOS technology. It achieves high
speed operation similar to equivalent Bipolar Schottky TTL while
maintaining CMOS low power dissipation.
The MC74VHC240 is an inverting 3−state buffer, and has two
active−low output enables. This device is designed to drive bus lines
or buffer memory address registers.
The internal circuit is composed of three stages, including a buffer
output which provides high noise immunity and stable output. The
inputs tolerate voltages up to 7V, allowing the interface of 5V systems
to 3V systems.
• High Speed: tPD = 3.6 ns (Typ) at VCC = 5 V
• Low Power Dissipation: ICC = 4 μA (Max) at TA = 25°C
• High Noise Immunity: VNIH = VNIL = 28% VCC
• Power Down Protection Provided on Inputs
• Balanced Propagation Delays
• Designed for 2 V to 5.5 V Operating Range
• Low Noise: VOLP = 0.9 V (Max)
• Pin and Function Compatible with Other Standard Logic Families
• Latchup Performance Exceeds 300 mA
• ESD Performance: HBM > 2000 V; Machine Model > 200 V
• Chip Complexity: 120 FETs or 30 Equivalent Gates
• These Devices are Pb−Free and are RoHS Compliant
OEA
1
20
VCC
A1
2
19
OEB
YB4
3
18
YA1
A2
4
17
B4
YB3
5
16
YA2
A3
6
15
B3
YB2
7
14
YA3
A4
8
13
B2
YB1
9
12
YA4
GND
10
11
B1
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MARKING
DIAGRAMS
20
20
VHC240
AWLYYWWG
1
SOIC−20
DW SUFFIX
CASE 751D
1
20
20
1
TSSOP−20
DT SUFFIX
CASE 948E
VHC240
A
WL, L
Y
WW, W
G or G
1
= Specific Device Code
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
(Note: Microdot may be in either location)
ORDERING INFORMATION
Device
Package
MC74VHC240DWR2G SOIC−20
1000 Units/Reel
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specification
Brochure, BRD8011/D.
FUNCTION TABLE
INPUTS
May, 2011 − Rev. 5
Shipping†
MC74VHC240DTR2G TSSOP−20 2500 Units/Reel
Figure 1. Pin Assignment
© Semiconductor Components Industries, LLC, 2011
VHC
240
ALYWG
G
1
OUTPUTS
OEA, OEB
A, B
YA, YB
L
L
H
L
H
X
H
L
Z
Publication Order Number:
MC74VHC240/D
MC74VHC240
A1
A2
A3
A4
DATA
INPUTS
B1
B2
B3
B4
OUTPUT
ENABLES
2
18
4
16
6
14
8
12
11
9
13
7
15
5
17
3
YA1
YA2
YA3
YA4
YB1
INVERTING
OUTPUTS
YB2
YB3
YB4
1
OEA
19
OEB
Figure 1. LOGIC DIAGRAM
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ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ
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ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ
MAXIMUM RATINGS*
Symbol
Parameter
Value
Unit
VCC
DC Supply Voltage
– 0.5 to + 7.0
V
Vin
DC Input Voltage
– 0.5 to + 7.0
V
Vout
DC Output Voltage
– 0.5 to VCC + 0.5
V
IIK
Input Diode Current
− 20
mA
IOK
Output Diode Current
± 20
mA
Iout
DC Output Current, per Pin
± 25
mA
ICC
DC Supply Current, VCC and GND Pins
± 75
mA
PD
Power Dissipation in Still Air,
500
450
mW
Tstg
Storage Temperature
– 65 to + 150
_C
SOIC Packages†
TSSOP Package†
* Absolute maximum continuous 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.
†Derating — SOIC Packages: – 7 mW/_C from 65_ to 125_C
TSSOP Package: − 6.1 mW/_C from 65_ to 125_C
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RECOMMENDED OPERATING CONDITIONS
Symbol
Parameter
Min
Max
Unit
2.0
5.5
V
VCC
DC Supply Voltage
Vin
DC Input Voltage
0
5.5
V
Vout
DC Output Voltage
0
VCC
V
− 40
+ 85
_C
0
0
100
20
ns/V
TA
Operating Temperature, All Package Types
tr, tf
Input Rise and Fall Time
VCC = 3.3V ±0.3V
VCC =5.0V ±0.5V
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2
This device contains protection
circuitry to guard against damage
due to high static voltages or electric
fields. However, precautions must
be taken to avoid applications of any
voltage higher than maximum rated
voltages to this high−impedance circuit. For proper operation, Vin and
Vout should be constrained to the
range GND v (Vin or Vout) v VCC.
Unused inputs must always be
tied to an appropriate logic voltage
level (e.g., either GND or V CC ).
Unused outputs must be left open.
MC74VHC240
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ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ
DC ELECTRICAL CHARACTERISTICS
Symbol
Parameter
VCC
V
Test Conditions
VIH
Minimum High−Level
Input Voltage
2.0
3.0 to
5.5
VIL
Maximum Low−Level
Input Voltage
2.0
3.0 to
5.5
VOH
Minimum High−Level
Output Voltage
Vin = VIH or VIL
IOH = − 50μA
Vin = VIH or VIL
IOH = − 4mA
IOH = − 8mA
VOL
Maximum Low−Level
Output Voltage
Vin = VIH or VIL
IOL = 50μA
TA = 25°C
Min
Max
1.50
VCC x 0.7
Min
2.0
3.0
4.5
1.9
2.9
4.4
3.0
4.5
2.58
3.94
Max
1.50
VCC x 0.7
0.50
VCC x 0.3
2.0
3.0
4.5
Vin = VIH or VIL
IOL = 4mA
IOL = 8mA
Typ
TA = − 40 to 85°C
2.0
3.0
4.5
Unit
V
0.50
VCC x 0.3
V
V
1.9
2.9
4.4
2.48
3.80
0.0
0.0
0.0
0.1
0.1
0.1
0.1
0.1
0.1
3.0
4.5
0.36
0.36
0.44
0.44
V
Iin
Maximum Input
Leakage Current
Vin = 5.5V or GND
0 to 5.5
± 0.1
± 1.0
μA
IOZ
Maximum
Three−State Leakage
Current
Vin = VIL or VIH
Vout = VCC or GND
5.5
± 0.25
± 2.5
μA
ICC
Maximum Quiescent
Supply Current
Vin = VCC or GND
5.5
4.0
40.0
μA
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3
MC74VHC240
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ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ
AC ELECTRICAL CHARACTERISTICS (Input tr = tf = 3.0ns)
TA = 25°C
Symbol
Parameter
tPLH,
tPHL
Maximum Propagation Delay,
A to YA or B to YB
tPZL,
tPZH
tPLZ,
tPHZ
tOSLH,
tOSHL
Output Enable Time
OEA to YA or OEB to YB
Output Disable Time
OEA to YA or OEB to YB
Output to Output Skew
Test Conditions
Min
TA = − 40 to 85°C
Typ
Max
Min
Max
Unit
ns
VCC = 3.3 ± 0.3V
CL = 15pF
CL = 50pF
5.3
7.8
7.5
11.0
1.0
1.0
9.0
12.5
VCC = 5.0 ± 0.5V
CL = 15pF
CL = 50pF
3.6
5.1
5.5
7.5
1.0
1.0
6.5
8.5
VCC = 3.3 ± 0.3V
RL = 1kΩ
CL = 15pF
CL = 50pF
6.6
9.1
10.6
14.1
1.0
1.0
12.5
16.0
VCC = 5.0 ± 0.5V
RL = 1kΩ
CL = 15pF
CL = 50pF
4.7
6.2
7.3
9.3
1.0
1.0
8.5
10.5
VCC = 3.3 ± 0.3V
RL = 1kΩ
CL = 50pF
10.3
14.0
1.0
16.0
VCC = 5.0 ± 0.5V
RL = 1kΩ
CL = 50pF
6.7
9.2
1.0
10.5
VCC = 3.3 ± 0.3V
(Note 1.)
CL = 50pF
1.5
1.5
VCC = 5.0 ± 0.5V
(Note 1.)
CL = 50pF
1.0
1.0
10
10
Cin
Maximum Input Capacitance
4
Cout
Maximum Three−State Output
Capacitance (Output in
High−Impedance State)
6
ns
ns
ns
pF
pF
Typical @ 25°C, VCC = 5.0V
CPD
17
Power Dissipation Capacitance (Note 2.)
pF
1. Parameter guaranteed by design. tOSLH = |tPLHm − tPLHn|, tOSHL = |tPHLm − tPHLn|.
2. CPD is defined as the value of the internal equivalent capacitance which is calculated from the operating current consumption without load.
Average operating current can be obtained by the equation: ICC(OPR) = CPD VCC fin + ICC / 8 (per bit). CPD is used to determine the no−load
dynamic power consumption; PD = CPD VCC2 fin + ICC VCC.
NOISE CHARACTERISTICS (Input tr = tf = 3.0ns, CL = 50pF, VCC = 5.0V)
TA = 25°C
Symbol
Typ
Parameter
Max
Unit
VOLP
Quiet Output Maximum Dynamic VOL
0.6
0.9
V
VOLV
Quiet Output Minimum Dynamic VOL
− 0.6
− 0.9
V
VIHD
Minimum High Level Dynamic Input Voltage
3.5
V
VILD
Maximum Low Level Dynamic Input Voltage
1.5
V
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4
MC74VHC240
SWITCHING WAVEFORMS
VCC
VCC
A or B
OEA or OEB
50%
50%
GND
GND
tPHL
YA or YB
tPZL
tPLH
HIGH
IMPEDANCE
50% VCC
YA or YB
50% VCC
tPLZ
tPZH
YA or YB
tPHZ
VOL +0.3V
VOH -0.3V
50% VCC
Figure 2.
HIGH
IMPEDANCE
Figure 3.
TEST CIRCUITS
TEST POINT
TEST POINT
OUTPUT
DEVICE
UNDER
TEST
OUTPUT
DEVICE
UNDER
TEST
CL*
*Includes all probe and jig capacitance
1 kΩ
CL*
CONNECT TO VCC WHEN
TESTING tPLZ AND tPZL.
CONNECT TO GND WHEN
TESTING tPHZ AND tPZH.
*Includes all probe and jig capacitance
Figure 4. Test Circuit
Figure 5. Test Circuit
INPUT
Figure 6. Input Equivalent Circuit
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5
MECHANICAL CASE OUTLINE
PACKAGE DIMENSIONS
SOIC−20 WB
CASE 751D−05
ISSUE H
DATE 22 APR 2015
SCALE 1:1
A
20
q
X 45 _
M
E
h
0.25
H
NOTES:
1. DIMENSIONS ARE IN MILLIMETERS.
2. INTERPRET DIMENSIONS AND TOLERANCES
PER ASME Y14.5M, 1994.
3. DIMENSIONS D AND E DO NOT INCLUDE MOLD
PROTRUSION.
4. MAXIMUM MOLD PROTRUSION 0.15 PER SIDE.
5. DIMENSION B DOES NOT INCLUDE DAMBAR
PROTRUSION. ALLOWABLE PROTRUSION
SHALL BE 0.13 TOTAL IN EXCESS OF B
DIMENSION AT MAXIMUM MATERIAL
CONDITION.
11
B
M
D
1
10
20X
B
b
0.25
M
T A
S
B
DIM
A
A1
b
c
D
E
e
H
h
L
q
S
L
A
18X
e
SEATING
PLANE
A1
c
T
GENERIC
MARKING DIAGRAM*
RECOMMENDED
SOLDERING FOOTPRINT*
20
20X
20X
1.30
0.52
20
XXXXXXXXXXX
XXXXXXXXXXX
AWLYYWWG
11
1
11.00
1
XXXXX
A
WL
YY
WW
G
10
1.27
PITCH
DIMENSIONS: MILLIMETERS
*For additional information on our Pb−Free strategy and soldering
details, please download the ON Semiconductor Soldering and
Mounting Techniques Reference Manual, SOLDERRM/D.
DOCUMENT NUMBER:
DESCRIPTION:
MILLIMETERS
MIN
MAX
2.35
2.65
0.10
0.25
0.35
0.49
0.23
0.32
12.65
12.95
7.40
7.60
1.27 BSC
10.05
10.55
0.25
0.75
0.50
0.90
0_
7_
98ASB42343B
SOIC−20 WB
= Specific Device Code
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
*This information is generic. Please refer to
device data sheet for actual part marking.
Pb−Free indicator, “G” or microdot “G”, may
or may not be present. Some products may
not follow the Generic Marking.
Electronic versions are uncontrolled except when accessed directly from the Document Repository.
Printed versions are uncontrolled except when stamped “CONTROLLED COPY” in red.
PAGE 1 OF 1
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© Semiconductor Components Industries, LLC, 2019
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MECHANICAL CASE OUTLINE
PACKAGE DIMENSIONS
TSSOP−20 WB
CASE 948E
ISSUE D
DATE 17 FEB 2016
SCALE 2:1
20X
0.15 (0.006) T U
2X
L
K REF
0.10 (0.004)
S
L/2
20
M
T U
S
V
ÍÍÍÍ
ÍÍÍÍ
ÍÍÍÍ
K
K1
S
J J1
11
B
SECTION N−N
−U−
PIN 1
IDENT
0.25 (0.010)
N
1
10
M
0.15 (0.006) T U
S
A
−V−
NOTES:
1. DIMENSIONING AND TOLERANCING PER
ANSI Y14.5M, 1982.
2. CONTROLLING DIMENSION: MILLIMETER.
3. DIMENSION A DOES NOT INCLUDE MOLD
FLASH, PROTRUSIONS OR GATE BURRS.
MOLD FLASH OR GATE BURRS SHALL NOT
EXCEED 0.15 (0.006) PER SIDE.
4. DIMENSION B DOES NOT INCLUDE
INTERLEAD FLASH OR PROTRUSION.
INTERLEAD FLASH OR PROTRUSION
SHALL NOT EXCEED 0.25 (0.010) PER SIDE.
5. DIMENSION K DOES NOT INCLUDE
DAMBAR PROTRUSION. ALLOWABLE
DAMBAR PROTRUSION SHALL BE 0.08
(0.003) TOTAL IN EXCESS OF THE K
DIMENSION AT MAXIMUM MATERIAL
CONDITION.
6. TERMINAL NUMBERS ARE SHOWN FOR
REFERENCE ONLY.
7. DIMENSION A AND B ARE TO BE
DETERMINED AT DATUM PLANE −W−.
N
F
DETAIL E
−W−
C
G
D
H
DETAIL E
0.100 (0.004)
−T− SEATING
PLANE
DIM
A
B
C
D
F
G
H
J
J1
K
K1
L
M
MILLIMETERS
MIN
MAX
6.40
6.60
4.30
4.50
--1.20
0.05
0.15
0.50
0.75
0.65 BSC
0.27
0.37
0.09
0.20
0.09
0.16
0.19
0.30
0.19
0.25
6.40 BSC
0_
8_
INCHES
MIN
MAX
0.252
0.260
0.169
0.177
--0.047
0.002
0.006
0.020
0.030
0.026 BSC
0.011
0.015
0.004
0.008
0.004
0.006
0.007
0.012
0.007
0.010
0.252 BSC
0_
8_
GENERIC
MARKING DIAGRAM*
SOLDERING FOOTPRINT
7.06
XXXX
XXXX
ALYWG
G
1
0.65
PITCH
16X
0.36
16X
1.26
DOCUMENT NUMBER:
98ASH70169A
DESCRIPTION:
TSSOP−20 WB
A
L
Y
W
G
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
(Note: Microdot may be in either location)
*This information is generic. Please refer to
device data sheet for actual part marking.
Pb−Free indicator, “G” or microdot “ G”,
may or may not be present.
DIMENSIONS: MILLIMETERS
Electronic versions are uncontrolled except when accessed directly from the Document Repository.
Printed versions are uncontrolled except when stamped “CONTROLLED COPY” in red.
PAGE 1 OF 1
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