DATA SHEET
Product specification
File under Integrated Circuits, IC24
1999 Sep 30
INTEGRATED CIRCUITS
74LVC2244A
Octal buffer/line driver with 30
series termination resistors; 5 V
input/output tolerant; 3-state
1999 Sep 30
2
Philips Semiconductors
Product specification
Octal buffer/line driver with 30
series termination
resistors; 5 V input/output tolerant; 3-state
74LVC2244A
FEATURES
5 V tolerant inputs/outputs for interfacing with 5 V logic
Wide supply voltage range of 1.2 to 3.6 V
CMOS low power consumption
Direct interface with TTL levels
Integrated 30
termination resistors.
DESCRIPTION
The 74LVC2244A 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
3.3/5 V environment.
The 74LVC2244A 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 74LVC2244A is designed with 30
series termination resistors in both HIGH and LOW output
stages to reduce line noise.
QUICK REFERENCE DATA
Ground = 0 V; T
amb
= 25
C; t
r
= t
f
2.5 ns.
Note
1. C
PD
is used to determine the dynamic power dissipation (P
D
in
W).
P
D
= C
PD
V
CC
2
f
i
+
(C
L
V
CC
2
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
CC
2
f
o
) = sum of the outputs.
SYMBOL
PARAMETER
CONDITIONS
TYPICAL
UNIT
t
PHL
/t
PLH
propagation delay 1A
n
to 1Y
n
; 2A
n
to 2Y
n
C
L
= 50 pF; V
CC
= 3.3 V
4.0
ns
C
I
input capacitance
5.0
pF
C
PD
power dissipation capacitance per buffer
V
I
= GND to V
CC
; note 1
25
pF
1999 Sep 30
3
Philips Semiconductors
Product specification
Octal buffer/line driver with 30
series termination
resistors; 5 V input/output tolerant; 3-state
74LVC2244A
FUNCTION TABLE
See note 1.
Note
1. H = HIGH voltage level;
L = LOW voltage level;
X = don't care;
Z = high-impedance OFF-state.
ORDERING INFORMATION
PINNING
INPUT
OUTPUT
nOE
nA
n
nY
n
L
L
L
L
H
H
H
X
Z
OUTSIDE NORTH
AMERICA
NORTH AMERICA
PACKAGE
TEMPERATURE
RANGE
PINS
PACKAGE
MATERIAL
CODE
74LVC2244AD
74LVC2244AD
-
40 to +85
C
20
SO
plastic
SOT163-1
74LVC2244ADB
74LVC2244ADB
20
SSOP
plastic
SOT339-1
74LVC2244APW
74LVC2244APW DH
20
TSSOP
plastic
SOT360-1
PIN
SYMBOL
DESCRIPTION
1
1OE
output enable input (active LOW)
2, 4, 6, 8
1A
0
to 1A
3
data inputs
3, 5, 7, 9
2Y
0
to 2Y
3
bus outputs
10
GND
ground (0 V)
11, 13, 15, 17
2A
3
to 2A
0
data inputs
12, 14, 16, 18
1Y
3
to 1Y
0
bus outputs
19
2OE
output enable input (active LOW)
20
V
CC
DC supply voltage
1999 Sep 30
4
Philips Semiconductors
Product specification
Octal buffer/line driver with 30
series termination
resistors; 5 V input/output tolerant; 3-state
74LVC2244A
Fig.1 Pin configuration.
handbook, halfpage
1OE
1A0
2Y0
1A1
2Y1
1A2
2Y2
1A3
2Y3
GND
VCC
2OE
1Y0
2A0
2A1
1Y2
1Y1
2A2
1Y3
2A3
1
2
3
4
5
6
7
8
9
10
11
12
20
19
18
17
16
15
14
13
2244
MNA357
handbook, halfpage
1A3
1A2
1A1
1A0
2
4
6
8
1
1Y0
1Y1
18
16
14
12
1Y2
1Y3
1OE
MNA360
2A3
2A2
2A1
2A0
17
15
13
11
19
2Y0
2Y1
3
5
7
9
2Y2
2Y3
2OE
Fig.2 Functional diagram.
Fig.3 IEC logic symbol.
handbook, halfpage
12
14
2
4
6
8
18
16
1
EN
MNA359
9
7
17
15
13
11
3
5
19
EN
1999 Sep 30
5
Philips Semiconductors
Product specification
Octal buffer/line driver with 30
series termination
resistors; 5 V input/output tolerant; 3-state
74LVC2244A
RECOMMENDED OPERATING CONDITIONS
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 134). Voltages are referenced to GND (ground = 0 V).
Notes
1. The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
2. For SO package: above 70
C the value of P
tot
derates linearly with 8 mW/K.
3. For SSOP and TSSOP package: above 60
C the value of P
tot
derates linearly with 5.5 mW/K.
SYMBOL
PARAMETER
CONDITIONS
MIN.
MAX.
UNIT
V
CC
DC supply voltage
for max. speed performance
2.7
3.6
V
for low-voltage applications
1.2
3.6
V
V
I
DC input voltage
0
5.5
V
V
O
DC output voltage
output HIGH or LOW state
0
V
CC
V
3-state
0
5.5
V
T
amb
operating ambient temperature
see DC and AC characteristics per
device
-
40
+85
C
t
r
,t
f
input rise and fall times
V
CC
= 1.2 to 2.7 V
0
20
ns/V
V
CC
= 2.7 to 3.6 V
0
10
SYMBOL
PARAMETER
CONDITIONS
MIN.
MAX.
UNIT
V
CC
DC supply voltage
-
0.5
+6.5
V
I
IK
DC input diode current
V
I
< 0
-
-
50
mA
V
I
DC input voltage
note 1
-
0.5
+
5.5
V
I
OK
DC output diode current
V
O
> V
CC
or V
O
< 0
-
50
mA
V
O
DC output voltage
output HIGH or LOW
note 1
-
0.5
V
CC
+ 0.5
V
output 3-state
note 1
-
0.5
+6.5
V
I
O
DC output diode current
V
O
= 0 to V
CC
-
50
mA
I
CC
, I
GND
DC V
CC
or GND current
-
100
mA
T
stg
storage temperature
-
65
+150
C
P
tot
power dissipation per package
plastic mini-pack (SO)
note 2
-
500
mW
plastic shrink mini-pack (SSOP and
TSSOP)
note 3
-
500
mW
PDF 
ZIP