74LVX244
LOW VOLTAGE CMOS OCTAL BUS BUFFER
WITH 3 STATE OUTPUTS (NON INVERTED)
s
s
s
s
s
s
s
s
s
s
s
HIGH SPEED:
t
PD
=4.5ns (TYP.) at V
CC
= 3.3V
5V TOLERANT INPUTS
POWER-DOWN PROTECTION ON INPUTS
INPUT VOLTAGE LEVEL:
V
IL
= 0.8V, V
IH
= 2V at V
CC
=3V
LOW POWER DISSIPATION:
I
CC
= 4
µA
(MAX.) at T
A
=25°C
LOW NOISE:
V
OLP
= 0.5V (TYP.) at V
CC
=3.3V
SYMMETRICAL OUTPUT IMPEDANCE:
|I
OH
| = I
OL
= 4 mA (MIN) at V
CC
=3V
BALANCED PROPAGATION DELAYS:
t
PLH
≅
t
PHL
OPERATING VOLTAGE RANGE:
V
CC
(OPR) = 2V to 3.6V (1.2V Data Retention)
PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 244
IMPROVED LATCH-UP IMMUNITY
SOP
TSSOP
ORDER CODES
PACKAGE
SOP
TSSOP
TUBE
74LVX244M
T&R
74LVX244MTR
74LVX244TTR
DESCRIPTION
The 74LVX244 is a low voltage CMOS OCTAL
BUS BUFFER (3-STATE) fabricated with
sub-micron silicon gate and double-layer metal
wiring C
2
MOS technology. It is ideal for low
power, battery operated and low noise 3.3V
applications.
G output enable governs four BUS BUFFERs
Power down protection is provided on all inputs
and 0 to 7V can be accepted on inputs with no
regard to the supply voltage.
This device can be used to interface 5V to 3V. It
combines high speed performance with the true
CMOS low power consumption.
All inputs and outputs are equipped with
protection circuits against static discharge, giving
them 2KV ESD immunity and transient excess
voltage.
PIN CONNECTION AND IEC LOGIC SYMBOLS
July 2001
1/9
74LVX244
INPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
PIN No
1
2, 4, 6, 8
9, 7, 5, 3
11, 13, 15,
17
18, 16, 14,
12
19
10
20
SYMBOL
1G
1A1 to 1A4
2Y1 to 2Y4
2A1 to 2A4
1Y1 to 1Y4
2G
GND
V
CC
NAME AND FUNCTION
Output Enable Input
Data Inputs
Data Outputs
Data Inputs
Data Outputs
Output Enable Input
Ground (0V)
Positive Supply Voltage
TRUTH TABLE
INPUTS
G
L
L
H
X :Don‘t Care
Z : High Impedance
OUTPUT
An
L
H
X
Yn
L
H
Z
ABSOLUTE MAXIMUM RATINGS
Symbol
V
CC
V
I
V
O
I
IK
I
OK
I
O
Supply Voltage
DC Input Voltage
DC Output Voltage
DC Input Diode Current
DC Output Diode Current
DC Output Current
Parameter
Value
-0.5 to +7.0
-0.5 to +7.0
-0.5 to V
CC
+ 0.5
- 20
±
20
±
25
±
50
-65 to +150
300
Unit
V
V
V
mA
mA
mA
mA
°C
°C
I
CC
or I
GND
DC V
CC
or Ground Current
T
stg
Storage Temperature
T
L
Lead Temperature (10 sec)
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is
not implied
RECOMMENDED OPERATING CONDITIONS
Symbol
V
CC
V
I
V
O
T
op
dt/dv
Supply Voltage (note 1)
Input Voltage
Output Voltage
Operating Temperature
Input Rise and Fall Time (note 2) (V
CC
= 3V)
Parameter
Value
2 to 3.6
0 to 5.5
0 to V
CC
-55 to 125
0 to 100
Unit
V
V
V
°C
ns/V
1) Truth Table guaranteed: 1.2V to 3.6V
2) V
IN
from 0.8V to 2.0V
2/9
74LVX244
DC SPECIFICATIONS
Test Condition
Symbol
Parameter
V
CC
(V)
2.0
3.0
3.6
2.0
3.0
3.6
2.0
3.0
3.0
V
OL
Low Level Output
Voltage
2.0
3.0
3.0
I
OZ
High Impedance
Output Leakage
Current
Input Leakage
Current
Quiescent Supply
Current
3.6
3.6
3.6
I
O
=-50
µA
I
O
=-50
µA
I
O
=-4 mA
I
O
=50
µA
I
O
=50
µA
I
O
=4 mA
V
I
= V
IH
or V
IL
V
O
= V
CC
or GND
V
I
= 5.5V or GND
V
I
= V
CC
or GND
T
A
= 25°C
Min.
1.5
2.0
2.4
0.5
0.8
0.8
1.9
2.9
2.58
0.0
0.0
0.1
0.1
0.36
±0.25
±
0.1
4
2.0
3.0
1.9
2.9
2.48
0.1
0.1
0.44
±
2.5
±
1
40
Typ.
Max.
Value
-40 to 85°C
Min.
1.5
2.0
2.4
0.5
0.8
0.8
1.9
2.9
2.4
0.1
0.1
0.55
±
2.5
±
1
40
µA
µA
µA
V
V
Max.
-55 to 125°C
Min.
1.5
2.0
2.4
0.5
0.8
0.8
Max.
V
Unit
V
IH
High Level Input
Voltage
Low Level Input
Voltage
High Level Output
Voltage
V
IL
V
V
OH
I
I
I
CC
DYNAMIC SWITCHING CHARACTERISTICS
Test Condition
Symbol
Parameter
V
CC
(V)
3.3
T
A
= 25°C
Min.
Typ.
0.5
-0.8
C
L
= 50 pF
2.0
-0.5
V
Max.
0.8
Value
-40 to 85°C
Min.
Max.
-55 to 125°C
Min.
Max.
Unit
V
OLP
V
OLV
V
IHD
V
ILD
Dynamic Low
Voltage Quiet
Output (note 1, 2)
Dynamic High
Voltage Input
(note 1, 3)
Dynamic Low
Voltage Input
(note 1, 3)
3.3
3.3
0.8
1) Worst case package.
2) Max number of outputs defined as (n). Data inputs are driven 0V to 3.3V, (n-1) outputs switching and one output at GND.
3) Max number of data inputs (n) switching. (n-1) switching 0V to 3.3V. Inputs under test switching: 3.3V to threshold (V
ILD
), 0V to threshold
(V
IHD
), f=1MHz.
3/9
74LVX244
AC ELECTRICAL CHARACTERISTICS
(Input t
r
= t
f
= 3ns)
Test Condition
Symbol
Parameter
V
CC
(V)
2.7
2.7
3.3
(*)
t
PZL
t
PZH
Output Enable
Time
3.3
(*)
2.7
2.7
3.3
(*)
t
PLZ
t
PHZ
t
OSLH
t
OSHL
3.3
(*)
2.7
3.3
(*)
2.7
3.3
(*)
C
L
(pF)
15
50
15
50
15
50
15
50
50
50
50
50
T
A
= 25°C
Min.
Typ.
6.1
8.6
4.5
7.2
7.1
9.6
5.5
8.0
11.6
9.7
0.5
0.5
Max.
11.4
14.9
7.1
10.6
13.8
17.3
8.8
12.3
16.0
11.4
1.0
1.0
Value
-40 to 85°C
Min.
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
Max.
13.5
17.0
8.5
12.0
16.5
20.0
10.5
14.0
19.0
13.0
1.5
1.5
-55 to 125°C
Min.
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
Max.
15.0
18.0
9.5
13.0
17.5
21.0
12.
15.0
20.5
14.5
1.5
1.5
ns
ns
ns
ns
Unit
t
PLH
t
PHL
Propagation Delay
Time
Output Disable
Time
Output to Output
Skew Time (note
1,2)
1) Skew is defined as the absolute value of the difference between the actual propagation delay for any two outputs of the same device switch-
ing in the same direction, either HIGH or LOW
2) Parameter guaranteed by design
(*) Voltage range is 3.3V
±
0.3V
CAPACITIVE CHARACTERISTICS
Test Condition
Symbol
Parameter
V
CC
(V)
3.3
3.3
3.3
f
IN
= 10MHz
T
A
= 25°C
Min.
Typ.
4
6
19
Max.
10
Value
-40 to 85°C
Min.
Max.
10
-55 to 125°C
Min.
Max.
10
pF
pF
pF
Unit
C
IN
C
OUT
C
PD
Input Capacitance
Output
Capacitance
Power Dissipation
Capacitance
(note 1)
1) C
PD
is defined as the value of the IC’s internal equivalent capacitance which is calculated from the operating current consumption without
load. (Refer to Test Circuit). Average operating current can be obtained by the following equation. I
CC(opr)
= C
PD
x V
CC
x f
IN
+ I
CC
/8 (per circuit)
4/9
PCB设计
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