Philips Semiconductors
Product specification
Octal buffer/line driver with 5 V tolerant
inputs/outputs; inverting (3-state)
FEATURES
•
5 V tolerant inputs/outputs, for interfacing with 5 V logic
•
Supply voltage range from 1.2 to 3.6 V
•
Complies with JEDEC standard no. 8-1A
•
CMOS low power consumption
•
Direct interface with TTL levels
•
High-impedance when V
CC
= 0 V.
DESCRIPTION
74LVC240A
The 74LVC240A is a high-performance, low-power,
low-voltage, Si-gate CMOS device, superior to most
advanced CMOS compatible TTL families.
Inputs can be driven from either 3.3 or 5 V devices.
In 3-state operation, outputs can handle 5 V. These
features allow the use of these devices as translators in a
mixed 3.3 and 5 V environment.
The 74LVC240A is an octal non-inverting buffer/line driver
with 3-state outputs. The 3-state outputs are controlled by
the output enable inputs 1OE and 2OE. A HIGH on nOE
causes the outputs to assume a high-impedance
OFF-state. Schmitt trigger action at all inputs makes the
circuit highly tolerant for slower input rise and fall times.
The 74LVC240A is functionally identical to the
74LVC244A, which has non-inverting outputs.
QUICK REFERENCE DATA
GND = 0 V; T
amb
= 25
°C;
t
r
= t
f
≤
2.5 ns.
SYMBOL
t
PHL
/t
PLH
C
I
C
PD
Notes
1. C
PD
is used to determine the dynamic power dissipation (P
D
in
µW).
P
D
= C
PD
×
V
CC2
×
f
i
+
∑
(C
L
×
V
CC2
×
f
o
) where:
f
i
= input frequency in MHz;
f
o
= output frequency in MHz;
C
L
= output load capacitance in pF;
V
CC
= supply voltage in Volts;
∑
(C
L
×
V
CC2
×
f
o
) = sum of outputs.
2. The condition is V
I
= GND to V
CC
.
PARAMETER
propagation delay nA
n
to nY
n
input capacitance
power dissipation capacitance per buffer
notes 1 and 2
CONDITIONS
C
L
= 50 pF; V
CC
= 3.3 V
TYPICAL
3.5
5.0
20
ns
pF
pF
UNIT
2002 Oct 02
2
Philips Semiconductors
Product specification
Octal buffer/line driver with 5 V tolerant
inputs/outputs; inverting (3-state)
FUNCTION TABLE
See note 1.
INPUT
nOE
L
L
H
Note
1. H = HIGH voltage level;
L = LOW voltage level;
X = don’t care;
Z = high-impedance OFF-state.
ORDERING INFORMATION
TYPE NUMBER
74LVC240AD
74LVC240ADB
74LVC240APW
PINNING
PIN
1
2, 4, 6, 8
3, 5, 7, 9
10
11, 13, 15, 17
12, 14, 16, 18
19
20
SYMBOL
1OE
1A
0
to 1A
3
2Y
o
to 2Y
3
GND
2A
3
to 2A
0
1Y
3
to 1Y
0
2OE
V
CC
data inputs
data outputs
ground (0 V)
data inputs
data outputs
output enable input (active LOW)
power supply
DESCRIPTION
output enable input (active LOW)
TEMPERATURE
RANGE
−40
to +85
°C
−40
to +85
°C
−40
to +85
°C
PACKAGE
PINS
20
20
20
PACKAGE
SO-20
SSOP-20
TSSOP-20
nA
n
L
H
X
74LVC240A
OUTPUT
nY
n
H
L
Z
MATERIAL
plastic
plastic
plastic
CODE
SOT163-1
SOT339-1
SOT360-1
2002 Oct 02
3
Philips Semiconductors
Product specification
Octal buffer/line driver with 5 V tolerant
inputs/outputs; inverting (3-state)
RECOMMENDED OPERATING INSTRUCTIONS
SYMBOL
V
CC
V
I
V
O
T
amb
t
r
, t
f
PARAMETER
supply voltage
input voltage
output voltage
operating ambient temperature
input rise and fall times
output HIGH or LOW state
output 3-state
in free air
V
CC
= 1.2 to 2.7 V
V
CC
= 2.7 to 3.6 V
CONDITIONS
for low voltage applications
MIN.
1.2
0
0
0
−40
0
0
74LVC240A
MAX.
3.6
3.6
5.5
V
CC
5.5
+85
20
10
V
V
V
V
V
UNIT
for maximum speed performance 2.7
°C
ns/V
ns/V
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 60134); voltages are referenced to GND (ground = 0 V);
note 1.
SYMBOL
V
CC
I
IK
V
I
I
OK
V
O
PARAMETER
supply voltage
input diode current
input voltage
output diode current
output voltage
V
I
< 0
note 2
V
O
> V
CC
or V
O
< 0
CONDITIONS
−
−0.5
−
MIN.
−0.5
−
−50
−
±50
−
−
±50
±100
−
TYP.
−
+6.5
−
MAX.
+6.5
V
mA
V
mA
UNIT
output HIGH or LOW state;
−0.5
note 2
output 3-state; note 2
−0.5
−
−
−65
V
O
= 0 to V
CC
V
CC
+ 0.5 V
+6.5
−
−
+150
V
mA
mA
°C
I
O
I
CC
, I
GND
T
stg
P
tot
output source or sink
current
V
CC
or GND current
storage temperature
power dissipation per
package:
SO
SSOP and TSSOP
above 70
°C
derates
linearly with 8 mW/K
above 60
°C
derates
linearly with 5.5 mW/K
−
−
500
500
−
−
mW
mW
Notes
1. Stresses beyond those listed may cause permanent damage to the device. These are stress ratings only and
functional operation of the device at these or any other conditions beyond those indicated under “Recommended
operating instructions” is not implied. Exposure to absolute-maximum-rated conditions for extended periods may
affect device reliability.
2. The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
2002 Oct 02
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