Philips Semiconductors
Product specification
Octal buffer/line driver; with 30
Ω
series termination
resistors; 5 V tolerant input/output; 3-state
FEATURES
•
5 V tolerant inputs/outputs for interfacing with 5 V logic
•
Wide supply voltage range from 1.2 V to 3.6 V
•
CMOS low power consumption
•
Direct interface with TTL levels
•
Inputs accept voltages up to 5.5 V
•
Integrated 30
Ω
termination resistors
•
Complies with EIA/JESD36
•
ESD protection:
HBM EIA/JESD22-A114-B exceeds 2000 V
MM EIA/JESD22-A115-A exceeds 200 V.
•
Specified from
−40 °C
to +85
°C
and
−40 °C
to +125
°C.
DESCRIPTION
74LVC2244A
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 V 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 V and 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 input pins 1OE and 2OE.
A HIGH on pin 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
Ω
series
termination resistors in both HIGH and LOW output stages
to reduce line noise.
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
×
N +
Σ(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;
N = total load switching outputs;
Σ(C
L
×
V
CC2
×
f
o
) = sum of the outputs.
2. The condition is V
I
= GND to V
CC
.
PARAMETER
propagation delay nAn to nYn
input capacitance
power dissipation capacitance per buffer
V
CC
= 3.3 V; notes 1 and 2
CONDITIONS
C
L
= 50 pF; V
CC
= 3.3 V
TYPICAL
3.1
4.0
8
ns
pF
pF
UNIT
2004 Apr 07
2
Philips Semiconductors
Product specification
Octal buffer/line driver; with 30
Ω
series termination
resistors; 5 V tolerant input/output; 3-state
ORDERING INFORMATION
PACKAGE
TYPE NUMBER
TEMPERATURE RANGE
74LVC2244AD
74LVC2244ADB
74LVC2244APW
74LVC2244ABQ
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.
PINNING
PIN
1
2
3
4
5
6
7
8
9
10
SYMBOL
1OE
1A0
2Y0
1A1
2Y1
1A2
2Y2
1A3
2Y3
GND
DESCRIPTION
output enable input (active LOW)
data input
bus output
data input
bus output
data input
bus output
data input
bus output
ground (0 V)
nAn
L
H
X
−40 °C
to +125
°C
−40 °C
to +125
°C
−40 °C
to +125
°C
−40 °C
to +125
°C
PINS
20
20
20
20
PACKAGE
SO20
SSOP20
TSSOP20
DHVQFN20
74LVC2244A
MATERIAL
plastic
plastic
plastic
plastic
CODE
SOT163-1
SOT339-1
SOT360-1
SOT764-1
OUTPUT
nYn
L
H
Z
PIN
11
12
13
14
15
16
17
18
19
20
SYMBOL
2A3
1Y3
2A2
1Y2
2A1
1Y1
2A0
1Y0
2OE
V
CC
DESCRIPTION
data input
data output
data input
data output
data input
data output
data input
data output
output enable input (active LOW)
supply voltage
2004 Apr 07
3
Philips Semiconductors
Product specification
Octal buffer/line driver; with 30
Ω
series termination
resistors; 5 V tolerant input/output; 3-state
74LVC2244A
handbook, halfpage
1OE
1
VCC
20
19
18
17
16
2OE
1Y0
2A0
1Y1
2A1
1Y2
2A2
1Y3
handbook, halfpage
1A0
1OE 1
1A0 2
2Y0 3
1A1 4
2Y1 5
1A2 6
2Y2 7
1A3 8
2Y3 9
GND 10
MNA357
2
3
4
5
20 VCC
19 2OE
18 1Y0
17 2A0
16 1Y1
2Y0
1A1
2Y1
1A2
2Y2
1A3
2Y3
GND
(1)
6
7
8
9
10
Top view
GND
11
2A3
MBL761
2244
15 2A1
14 1Y2
13 2A2
12 1Y3
11 2A3
15
14
13
12
(1) The die substrate is attached to this pad using conductive die
attach material. It can not be used as a supply pin or input.
Fig.1 Pin configuration SO20 and (T)SSOP20.
Fig.2 Pin configuration DHVQFN20.
handbook, halfpage
1
EN
18
16
14
12
handbook, halfpage
2
17
4
15
6
13
8
11
1
19
1A0
2A0
1A1
2A1
1A2
2A2
1A3
2A3
1OE
2OE
1Y0
2Y0
1Y1
2Y1
1Y2
2Y2
1Y3
2Y3
18
3
2
4
16
5
14
7
12
9
6
8
19
EN
9
7
5
3
MNA169
11
13
MNA168
15
17
Fig.3 Logic symbol.
Fig.4 Logic symbol (IEEE/IEC).
2004 Apr 07
4
Embedded System
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