TECHNICAL DATA
IN74VHCT244
Octal Buffer /Line Driver NINV (3-state)
IN74VHCT244 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, IN74VHCT244 can be compared
with equivalent bipolar ICs based on Schottky TTL and two
times surpasses ICs of IN74 series.
IN74VHCT244 tolerates operation under conditions
when voltage on input & output is exceeded up to 7V
without affecting characteristics and IC reliability. This
possibility allows to use IN74VHCT244 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 levels of IN74VHCT244 are compatible with TTL
level and output levels with CMOS levels.
ORDERING INFORMATION
IN74VHCT244N Plastic
IN74VHCT244DW SOIC
T
A
= -40
to 85 C for all packages
Features:
Supply voltage range 4.5 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 IN74HCT244.
.
1
IN74VHCT244
IN74VHCT244 truth table
Input Output
G
A Y
L L
L
L H
H
H X
Z
Note -
H - high voltage level;
L - low voltage level;
X - any voltage level (low or high);
Z - output in third state
Pins description in IN74VHC241
Pin No.
Symbol
Description
01
1G
Input OUTPUT ENABLE
02 1A1
Data
input
03 2Y4
Data
output
04 1A2
Data
input
05 2Y3
Data
output
06 1A3
Data
input
07 2Y2
Data
output
08 1A4
Data
input
09 2Y1
Data
output
10 GND
Common
output
11 2A1
Data
input
12 1Y4
Data
output
13 2A2
Data
input
14 1Y3
Data
output
15 2A3
Data
input
16 1Y2
Data
output
17 2A4
Data
input
18 1Y1
Data
output
19
2G
Input OUTPUT ENABLE
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
IN74VHCT244
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
V
CC
+ 0.5B
Output voltage, V
Vout1
-0.5
7.0
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
4.5 5.5
Input voltage,V
Vin
0
V
CC
Output voltage, V
Vout
0
V
CC
Output voltage, V
Vout1
0
5.5*
Output current, mA
Iout
-
8.0
Input rise and fall time, ns/V
t
LH
, t
HL
0 20
* - Outputs in the third state
3
IN74VHCT244
DC electrical characteristics
Value
25
C
-40
to 85
C
Symbo
l
Parameter Test
conditions
V
CC
,
V
min max
min max
Unit
V
IH
High input voltage
V
O
0.1 V or
V
O
V
CC
-0.1
4.5 -
5.5
2.0
- 2.0
- V
V
IL
Low input voltage
V
O
0.1 V or
V
O
V
CC
-0.1
4.5 -
5.5
- 0.8
- 0.8
4.5 4.42
- 4.4 -
V
I
= V
IH
or V
IL
I
O
= -50 mkA
5.5 5.42
- 5.4 -
V
OH
High output voltage
V
I
= V
IH
or V
IL
;
I
O
= -8 mA
4.5 3.94
- 3.80 -
4.5 - 0.09
- 0.1
V
I
= V
IH
or V
IL
I
O
= 50 mkA
5.5 - 0.09
- 0.1
V
OL
Low output voltage
V
I
= V
IH
or V
IL
I
O
= 8 mA
4.5 - 0.36
- 0.44
I
OZ
Output current in
"off" state
V
I
= 2.0V
V
O
= V
CC
or 0V
5.5 -
0.25
-
2.5
I
I
Input current
V
I
= 0 V or V
CC
5.5
0.1
1.0
I
IH1
High level input
current
V
I
= 5.5V
0
-
0.1
-
1.0
uA
I
CC
Consumption current V
I
=V
CC
or 0V
5.5 - 4.0 - 40.0
I
CCT
TTL-input
consumption current
V
I
= 3.4 V
5.5 - 1.35
- 1.5 mA
4
IN74VHCT244
AC electrical characteristics (t
LH
= t
HL
= 3.0 ns)
Value
25
C
-40
to 85
C
Symbol Parameter
Test conditions
V
CC
, V
C
L
,
pF
min
max min max
Unit
15
- 7.4 - 8.5
t
PHL
,
t
PLH
Propagation delay time
when switching "on",
"off"
Fig 1
5.0 0.5
50
- 8.4 - 9.5
ns
t
PHZ
, t
PLZ
Propagation delay time
under transition from
high , low level into "off"
state
Fig 2
5.0 0.5 50
- 11.4 - 13.0
ns
15
- 10.4 - 12.0
t
PZH
, t
PZL
Propagation delay time
under transition from
off state into high, low
level
Fig 2
5.0 0.5
50
- 11.4 - 13.0
ns
t
OSLH
,
t
OSHL
Propagation delays
difference between
outputs
-
5.0 0.5 50
- 1.0 - 1.0 ns
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
18
pF
C
D
Dynamic capacity
V
I
= 0 V orV
CC
5.0 36 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
-
1.1
V
V
OLV
Negative noise of low output
voltage
5.0 -1.1 -
V
IHD
Input dynamic high voltage
5.0
2.0
V
ILD
Input dynamic low voltage
5.0
0.8
5
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