TECHNICAL DATA
IN74VHC240
Octal Buffer/Line driver, INV (3-State)
IN74VHC240 is high-speed logic IC made by CMOS
technology and designed for use in high-performance
calculating systems with a wide supply voltage range.
As for operation speed, IN74VHC240 can be compared
with equivalent bipolar ICs based on Schottky TTL and two
times surpasses ICs of IN74 series.
IN74VHC240 tolerates operation under conditions when
voltage on input is exceeded up to 7V without affecting
characteristics and IC reliability. This possibility allows to
use IN74VHC240 in radio-electronic devices for interfacing
with supply voltages 5V and 3V, eliminate IC failure under
supply voltage source emergency outage.
Use of output edge shaping block in the microcircuit
allows to reduce noise amplitude of noises when switching
outputs into the same state simultaneously.
Input and output levels of IN74VHC240 are compatible
with CMOS levels
ORDERING INFORMATION
IN74VHC240N Plastic
IN74VHC240DW SOIC
T
A
= -40
to 85 C for all packages
Features:
Supply voltage range 2.0 to 5.5 V.
Output current 8 mA.
Low consumption current: 0.2 mkA (typical value) at = 25
.
Latchup current not less than 300 mA at = 85
.
Tolerable value of static potential not less than 2000 V as per human body model
(HBM) and not less than 200 V as per machine model ().
Ambient operation temperature minus 40 to plus 85
.
Balanced signal propagation delay.
Ensures voltage exceeding mode on input
Low noise level at the simultaneous switching of outputs in the same state: V
OLP
= 0.8
V (max).
For pins and functions, compatible with IN74HC240.
.
1
IN74VHC240
IN74VHC240 truth table
Input Output
G
A
Y
L L H
L H L
H X Z
Note - H - high voltage level;
L - low voltage level;
X - any voltage level (low or high);
Z - output in the third
Pins description in IN74VHC240
Pin No.
Symbol
Description
01
1G
Output enable input
02 1A1
Data
input
03
2Y4
Inverse data output
04 1A2
Data
input
05
2Y3
Inverse data output
06 1A3
Data
input
07
2Y2
Inverse data output
08 1A4
Data
input
09
2Y1
Inverse data output
10 GND
Common
output
11 2A1
Data
input
12
1Y4
Inverse data output
13 2A2
Data
input
14
1Y3
Inverse data output
15 2A3
Data
input
16
1Y2
Inverse data output
17 2A4
Data
input
18
1Y1
Inverse data output
19
2G
Output enable input
Pinout
01
1A1
02
03
04
05
06
07
08
09
GND
10
20
19
18
17
16
15
14
13
12
11
V
CC
1G
2Y4
1A2
2Y3
1A3
2Y2
1A4
2Y1
2A1
1Y4
2A2
1Y3
2A3
1Y2
2A4
1Y1
2G
20 VCC
Supply output from voltage
source
2
IN74VHC240
Absolute maximum conditions*
Parameter, unit
Symbol
Value
min
max
Supply voltage, V
V
CC
-0.5 7.0
Input voltage, V
Vin
-0.5
7.0
Output voltage, V
Vout
-0.5
Vcc+0.5V
Input diode current, mA
Iik
-
-20
Current of common output and supply
output, mA
Icc -
75
Output current, mA
Iout
-
25
Output diode current, mA
Iok
-
20
Dissipated power, mW
Pd
-
180
*Under absolute maximum conditions operation of microcircuit is not guaranteed. Operation is
guaranteed under maximum conditions
Maximum conditions
Symbol Value
Parameter, unit
min
max
Supply voltage, V
V
CC
2.0 5.5
Input voltage,V
Vin
0
V
CC
Output voltage, V
Vout
0
V
CC
Output current, mA
Iout
-
8.0
Input rise and fall time, ns/V
at Vcc = (3.3 0.3) V
at Vcc = (5.0 0.5) V
t
LH
, t
HL
0
0
100
20
3
IN74VHC240
AC electrical characteristics (t
LH
= t
HL
= 3.0 ns)
Value
25
C
-40
to 85
C
Symbol Parameter
Test
conditi
ons
V
CC
, V
C
L
,
pF
min max min max
Unit
15
- 7.5
- 9.0
3.3 0.3
50
- 11.0
- 12.5
15
- 5.5
- 6.5
t
PHL
,
t
PLH
Propagation delay time
when switching "on",
"off"
Figure
1
5.0 0.5
50
- 7.5
- 8.5
ns
3.3 0.3
50
-
14.0
-
16.0
t
PHZ
, t
PLZ
Propagation delay time
under transition from
high , low level into "off"
state
Figure
2
5.0 0.5
50
-
9.2
-
10.5
15
- 10.6
- 12.5
3.3 0.3
50
- 14.1
- 16.0
15
- 7.3
- 8.5
t
PZH
, t
PZL
Propagation delay time
under transition from
off state into high, low
level
Figure
2
5.0 0.5
50
- 9.3
- 10.5
-
3.3 0.3
50
-
1.5
-
1.5
t
OSLH
, t
OSHL
Propagation delays
difference between
outputs
5.5 0.5
50
-
1.0
-
1.0
Capacitance characteristics
Value
25
C
Symbol Parameter
Test conditions
V
CC
, V
min max
Unit
C
I
Input capacity
-
5.0
10
pF
C
O
Output capacity
-
5.0
12
pF
C
D
Dynamic capacity
V
I
= 0 V orV
CC
5.0 34 pF
Noise characteristics (C
L
= 50 pF)
Value
Symbol
Parameter
V
CC
, V
min max
Unit
V
OLP
Positive noise of low output voltage
5.0
-
0.9
V
V
OLV
Negative noise of low output
voltage
5.0 -0.9 -
V
IHD
Input dynamic high voltage
5.0
3.5
-
V
ILD
Input dynamic low voltage
5.0
-
1.5
5
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