www.docs.chipfind.ru
1
Memory
All data sheets are subject to change without notice
(858) 503-3300 - Fax: (858) 503-3301 - www.maxwell.com
P
RELIMINARY
3.3V ABT 8-Bit Octal
54LVTH244A
2001 Maxwell Technologies
All rights reserved.
Buffers/Drivers
12.19.01 Rev 1
1000601
F
EATURES
:
3.3V ABT octal buffers/drivers with 3-state outputs
R
AD
-P
AK
radiation-hardened against natural space radia-
tion
Package:
- 20 Pin R
AD
-P
AK
flat package
Operating temperature range:
-55 to 125
C
Supports mixed-mode signal operation
-5V Input and Output Voltages with 3.3V V
CC
Supports mixed-mode signal operation
- 5V input and output voltages with 3.3V V
CC
Supports unregulated battery operation down to 2.7V
Typical V
OLP
(output ground bounce) < 0.8V at V
CC
=3.3V,
T
A
=25
C
Supports live insertion
Bus-hold data inputs eliminate the need for external pullup
resistors
D
ESCRIPTION
:
Maxwell Technologies' 54LVTH244A octal buffers/drivers
micro-circuit is housed in a Rad-Pak package. The
54LVTH244A is designed specifically for low voltage (3.3V)
V
CC
operation, but with the capability to provide a TTL inter-
face to a 5V system environment. The 54LVTH244A is orga-
nized as two 4-bit drivers with separate output enable (OE)
inputs. When OE is low, the device passes data from the A
inputs to the Y outputs. When OE is high, the outputs are in
the high impedance state. The 54LVTH244A active bus hold
circuitry is provided to prevent floating data inputs at a valid
logic level and to eliminate the need for pullup resistors.
Maxwell Technologies' patented R
AD
-P
AK
packaging technol-
ogy incorporates radiation shielding in the microcircuit pack-
age. It eliminates the need for box shielding while providing
the required radiation shielding for a lifetime in orbit or a space
mission. This product is available with packaging and screen-
ing up to Class S.
Logic Diagram
Memory
P
RELIMINARY
2
All data sheets are subject to change without notice
2001 Maxwell Technologies
All rights reserved.
3.3V ABT 8-Bit Octal Buffers/Drivers
54LVTH244A
12.19.01 Rev 1
1000601
T
ABLE
1. P
INOUT
D
ESCRIPTION
P
IN
S
YMBOL
D
ESCRIPTION
1, 19
1OE-2OE
Output Enable
2, 4, 6, 8
IA1-IA4
Input
3, 5, 7, 9
2Y4-2Y1
Output
10
GND
Ground
11, 13, 15, 17
2A1-2A4
Input
12, 14, 16, 18
1Y4-1Y1
Output
20
V
CC
Supply Voltage
T
ABLE
2. 54LVTH244A A
BSOLUTE
M
AXIMUM
R
ATINGS1
1. Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are
stress ratings only, and functional operation of the device at these or any other conditions betond those indicated under "Rec-
ommended Operating Conditions" is not imp[lied. Exposure to absolute-maximum-rated conditions for extended periods may
affect device reliability.
P
ARAMETER
S
YMBOL
M
IN
M
AX
U
NIT
Supply Voltage Range
V
CC
-0.5
4.6
V
Input Voltage Range
2
2. The input and output negative-voltage ratings may be exceeded if the input and output clamp-current ratings are observed.
V
I
-0.5
7.0
V
Voltage Range Applied to Any Output in the High State or Power-Off
State
V
O
-0.5
7.0
V
Current into Any Output in the Low State
I
O
--
96
mA
Current Into Any Output in the High State
3
3. This current flows only when the output is in the high state and V
O
> V
CC
.
I
O
--
48
mA
Input Clamp Current (V
I
< 0)
I
IK
--
-50
mA
Output Clamp Current (V
O
< 0)
I
OK
--
-50
mA
Total Power Dissipation at T
A
= 55
C
P
D
--
650
mW
Operating Temperature
T
A
-55
125
C
Storage Temperature Range
T
S
-65
150
C
Memory
P
RELIMINARY
3
All data sheets are subject to change without notice
2001 Maxwell Technologies
All rights reserved.
3.3V ABT 8-Bit Octal Buffers/Drivers
54LVTH244A
12.19.01 Rev 1
1000601
T
ABLE
3. D
ELTA
L
IMITS
P
ARAMETER
V
ARIATION
I
CC(OL)
10% of specified value on Table 5
I
OZH
10% of specified value on Table 5
I
OZL
10% of specified value on Table 5
T
ABLE
4. 54LVTH244A R
ECOMMENDED
O
PERATING
C
ONDITIONS
1
1. All unused control inputs must be held high or low toensure proper device operation.
P
ARAMETER
S
YMBOL
M
IN
M
AX
U
NIT
Supply Voltage
V
CC
2.7
3.6
V
High-level Input Voltage
V
IH
2.0
--
V
Low-level Input Voltage
V
IL
--
0.8
V
Input Voltage
V
I
--
5.5
V
High-level Output Current
I
OH
--
-24
mA
Low-level Output Current
I
OL
--
48
mA
Input Transition Rise or Fall Rate
t/
v
--
10
ns/V
Operating Temperature
T
A
-55
125
C
T
ABLE
5. 54LVTH244A DC E
LECTRICAL
C
HARACTERISTICS
(V
CC
= 3.3V 10%, T
A
= -55
C
TO
125
C,
UNLESS
OTHERWISE
SPECIFIED
)
P
ARAMETER
S
YMBOL
T
EST
C
ONDITIONS
M
IN
M
AX
U
NIT
Input Clamp Voltage
V
IK
V
CC
= 2.7
I
I
= -18mA
--
-1.2
V
High-Level Output Voltage
V
OH
V
CC
= 2.7V to 3.6V
I
OH
= -100A
V
CC
-0.2
--
V
V
CC
= 2.7V
I
OH
= -8mA
2.4
--
V
CC
= 3V
I
OH
= 24mA
2.0
--
Low-Level Output Voltage
V
OL
V
CC
= 2.7V
I
OL
= 100A
--
0.2
V
I
OL
= 24mA
--
0.5
V
CC
= 3V
I
OL
= 16mA
--
0.4
I
OL
= 32mA
--
0.5
I
OL
= 32mA
--
0.55
Memory
P
RELIMINARY
4
All data sheets are subject to change without notice
2001 Maxwell Technologies
All rights reserved.
3.3V ABT 8-Bit Octal Buffers/Drivers
54LVTH244A
12.19.01 Rev 1
1000601
Input Current
I
I
V
CC
= 0 or 3.6V
V
I
= 5.5V
10
A
V
CC
= 3.6V
V
I
= V
CC
or
GND
Control
Inputs
--
1
V
CC
= 3.6V
V
I
= V
CC
Data Inputs
--
1
V
I
= 0
--
-5
Hold Current
I
I(HOLD)
V
CC
= 3V
V
I
= 0.8V
Data Inputs
75
--
A
V
I
= 2V
-75
--
Output Disabled Leakage Cur-
rent - High
I
OZH
V
CC
= 3.6V, V
O
= 3V
--
5
A
Output Disabled Leakage Cur-
rent - Low
I
OZL
V
CC
= 3.6V, V
O
= 0.5V
--
-5
A
Power Up Current
I
OZPU
2
V
CC
= 0 to 1.5V, V
O
= 0.5V to 3V, OE = don't care
--
100
A
Power Down Current
I
OZPD
2
V
CC
= 1.5V to 0, V
O
= 0.5V to 3V, OE = don't care
--
100
A
Supply Current
I
CC
V
CC
= 3.6V
Outputs high
--
0.19
mA
I
O
= 0
Outputs low
--
5
V
I
= V
CC
or GND
Outputs dis-
abled
--
0.19
Delta Supply Current
I
CC
1
V
CC
= 3V to 3.6V, One input at V
CC
-0.6V, Other inputs
at V
CC
or GND
--
0.2
mA
Input Capacitance
C
I
2
V
I
= 3V or 0
--
8
pF
Input Output Capacitance
C
O
2
V
O
= 3V or 0
--
15
pF
1. This is the increase in supply current for each input that is at the specified TTL voltage level rather than V
CC
or GND.
2. Guaranteed by design.
T
ABLE
6. 54LVTH244A AC E
LECTRICAL
C
HARACTERISTICS
(T
A
= -55
C
TO
125
C, C
L
= 50
P
F,
UNLESS
OTHERWISE
SPECIFIED
)
P
ARAMETER
S
YMBOL
V
CC
= 3.3V 0.3V
V
CC
= 2.7V
U
NIT
M
IN
M
AX
M
IN
M
AX
Propogation Delay Time
A to Y
t
PLH
--
4.7
--
4.1
ns
t
PHL
--
4.4
--
3.9
Output Enable Time
OE to Y
t
PZH
--
6.9
--
6.0
ns
t
PZL
--
5.4
--
5.4
Output Disable
OE to Y
t
PHZ
--
6.2
--
5.8
ns
t
PLZ
--
5.5
--
4.8
T
ABLE
5. 54LVTH244A DC E
LECTRICAL
C
HARACTERISTICS
(V
CC
= 3.3V 10%, T
A
= -55
C
TO
125
C,
UNLESS
OTHERWISE
SPECIFIED
)
P
ARAMETER
S
YMBOL
T
EST
C
ONDITIONS
M
IN
M
AX
U
NIT
Memory
P
RELIMINARY
5
All data sheets are subject to change without notice
2001 Maxwell Technologies
All rights reserved.
3.3V ABT 8-Bit Octal Buffers/Drivers
54LVTH244A
12.19.01 Rev 1
1000601
F
IGURE
1. L
OAD
C
IRCUIT
FOR
O
UTPUTS
Figure Note:
1. CL includes probe and jog capacitance
F
IGURE
2. P
ULSE
D
URATION
T
ABLE
7. F
UNCTION
T
ABLE
(
EACH
BUFFER
)
INPUTS
OUTPUT
OE
A
Y
l
H
H
L
L
L
H
X
Z
P
ARAMETER
M
EASUREMENT
I
NFORMATION
T
EST
S1
T
PLH
/T
PHL
Open
T
PLZ
/T
PZL
6V
T
PHZ
/T
PZH
GND
PDF 
ZIP