54BCT245
Octal Buffers Transceiver
Memory
Logic Diagram
F
EATURES
:
• 3-state outputs drive bus lines or buffer memory address
registers
• R
AD
-P
AK®
radiation-hardened against natural space radia-
tion
• Total dose hardness:
- > 100 krad (Si), depending upon space mission
• Package:
- 20-pin R
AD
-P
AK®
flat package
• Operating temperature range: -55 to +125°C
• Bi-CMOS design
• ESD protection exceeds 2000V
D
ESCRIPTION
:
Maxwell Technologies’ 54BCT245 octal bus transceiver fea-
tures a greater than 100 krad (Si) total dose tolerance. The
54BCT245 is designed specifically for asynchronous commu-
nication between data buses. The 54BCT245 transmits data
from the A bus to the B bus or from the B bus to the A bus
depending upon the level at the direction-control (DIR) input.
The output-enable (OE) input can be used to disable the
device so the buses are effectively isolated.
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 space
mission. In a GEO orbit, R
AD
-P
AK
provides greater than 100
krad (Si) radiation dose tolerance. This product is available
with screening up to Class S.
7.25.02 REV 5
All data sheets are subject to change without notice
1
(858) 503-3300 - Fax: (858) 503-3301 - www.maxwell.com
©2002 Maxwell Technologies
All rights reserved.
Octal Buffers Transceiver
T
ABLE
1. P
INOUT
D
ESCRIPTION
P
IN
1
2-9
10
11-18
19
20
S
YMBOL
DIR
A1-A8
GND
B8-B1
OE
V
CC
D
ESCRIPTION
Directional Control Input
Bi-directional I/O’s with Tri-State
Ground
Bi-directional I/O’s with Tri-State
Output Enable
Supply Power
54BCT245
T
ABLE
2. 54BCT245 A
BSOLUTE
M
AXIMUM
R
ATINGS 1
P
ARAMETER
Supply Voltage Range
Input Voltage Range
Control Input 3/I/O Ports
2
I/O Ports
3
Voltage Range Applied to any Output in the Disable or Power-Off
State
Voltage Range Applied to any Output in High State
Current Into Any Output in the Low State
Total Power Dissipation @ T
A
= +55
°
C
3
Input Clamp Current
Operating Temperature Range
Storage Temperature Range
S
YMBOL
V
CC
V
I
-0.5
-0.5
V
O
V
O
I
O
P
D
I
IK
(V
I
< 0)
T
A
T
S
-0.5
-0.5
--
--
--
-55
-65
7.0
5.5
7.0
V
CC
96
651
-30
125
150
V
V
mA
mW
mA
°C
°C
M
IN
-0.5
M
AX
7.0
U
NIT
V
V
Memory
1. Stresses above the absolute maximum rating may cause permanent damage to the device. Extended operation at the maxi-
mum levels may degrade performance and affect reliability.
2. The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
3. Must be able to withstand the additional P
D
due to short circuit test, e.g. I
DS
. The P
D
number is based upon dc values.
T
ABLE
3. D
ELTA
L
IMITS
P
ARAMETER
I
CC(OL)
I
CC(OH)
I
CC(OD)
V
ARIATION
±10% of specified value in Table 5
±10% of specified value in Table 5
±10% of specified value in Table 5
7.25.02 Rev 1
All data sheets are subject to change without notice
2
©2002 Maxwell Technologies
All rights reserved.
Octal Buffers Transceiver
54BCT245
T
ABLE
4. 54BCT245 R
ECOMMENDED
O
PERATING
C
ONDITIONS1
P
ARAMETER
Supply Voltage
High-Level Input Voltage
Low-Level Input Voltage
High-Level Output Current
A Port
B Port
Low-Level Output Current
A Port
B Port
Input Clamp Current
Thermal Impedance — Flat Package
Operating Temperature
S
YMBOL
V
CC
V
IH
V
IL
I
OH
M
IN
4.5
2.0
--
--
-3
-12
I
OL
--
20
48
I
IK
--
--
-55
-18
5.56
125
mA
°C/W
°
C
M
AX
5.5
--
0.8
U
NIT
V
V
V
mA
mA
Θ
JC
T
A
Memory
1. All unused control inputs must be held high or low to ensure proper device operation.
T
ABLE
5. 54BCT245 DC E
LECTRICAL
C
HARACTERISTICS
(V
CC
= 5V ±10%, T
A
= -55
°
C
TO
125
°
C,
UNLESS OTHERWISE SPECIFIED
)
P
ARAMETER
Input Clamp Voltage
High-Level Output Voltage
S
YMBOL
V
IK
V
OH
V
CC
= 4.5 V
V
CC
= 4.5 V Port A
Port B
Low-Level Output Voltage
Input Current
High Level Input Current
1
Low Level Input Current
2
Short-circuit Output Current
2
Supply Current, Outputs High
Supply Current, Outputs Low
V
OL
I
I
I
IH
I
IL
I
OS
I
CCH
I
CCL
V
CC
= 4.5 V Port A
Port B
V
CC
= 5.5 V A or B Port
Control Input
V
CC
= 5.5 V A or B Port
Control Input
V
CC
= 5.5 V A or B Port
Control Input
V
CC
= 5.5 V A Port
B Port
A to B
A to B
V
CC
= 5.5 V
V
CC
= 5.5 V
1, 2, 3
1, 2, 3
V
O
= 0 V
1, 2, 3
-60
-100
--
--
V
IN
= 0.5 V
1, 2, 3
V
I
= 2.7 V
1, 2, 3
--
--
--
T
EST
C
ONDITIONS
I
I
= -18.0 mA
I
OH
= -1 mA
I
OH
= -3 mA
I
OH
= -3 mA
I
OH
= -12 mA
I
OL
= 20 mA
I
OL
= 48 mA
V
I
= 5.5V
1, 2, 3
1, 2, 3
S
UBGROUPS
1, 2, 3
1, 2, 3
M
IN
--
2.5
2.4
2.4
2
--
--
M
AX
-1.2
--
--
--
--
0.5
0.55
1
0.1
70
20
-0.65
-1.2
-150
-225
57
90
mA
mA
mA
µA
µA
mA
mA
V
U
NIT
V
V
7.25.02 Rev 1
All data sheets are subject to change without notice
3
©2002 Maxwell Technologies
All rights reserved.
Octal Buffers Transceiver
T
ABLE
5. 54BCT245 DC E
LECTRICAL
C
HARACTERISTICS
(V
CC
= 5V ±10%, T
A
= -55
°
C
TO
125
°
C,
UNLESS OTHERWISE SPECIFIED
)
P
ARAMETER
Supply Current, Outputs Dis-
abled to High Impedance State
Input Capacitance
Input Output Capacitance
S
YMBOL
I
CCZ
C
i3
C
io3
V
CC
= 5.5 V
V
I
= 2.5 V or Control Input V
CC
= 5.5 V
0.5V
V
CC
= 5.5 V
A to B
B to A
V
I
= 2.5 V or
0.5 V
T
EST
C
ONDITIONS
S
UBGROUPS
1, 2, 3
1, 2, 3
54BCT245
M
IN
--
M
AX
15
7
9
12
U
NIT
mA
pF
pF
1. For I/O ports, the parameters I
IH
and I
IL
include the off-state output current.
2. Not more than one output should be shorted at one time and the duration of test shall not exceed one second.
3. Guaranteed by design.
T
ABLE
6. 54BCT245 AC E
LECTRICAL
C
HARACTERISTICS
(V
CC
= 5V ±10%, T
A
= -55
°
C
TO
125
°
C,
UNLESS OTHERWISE SPECIFIED
)
P
ARAMETER
Propagation Delay Time
from A or B to B or A
S
YMBOL
t
PLH
t
PHL
t
PLH
t
PHL
Output Enable Time
OE to Yn
t
PZH
t
PZL
t
PZH
t
PZL
Output Disable Time
OE to Yn
t
PHZ
t
PLZ
t
PHZ
t
PLZ
T
EST
C
ONDITIONS
V
CC
= 4.5 to 5.5 V
R
1
= 500
Ω
T
A
= -55 to +125
°
C
V
CC
= 5.0 V
R
1
= 500
Ω
T
A
= +25
°
C
V
CC
= 4.5 to 5.5 V
R
1
= 500
Ω
T
A
= -55 to +125
°
C
V
CC
= 5.0 V
R
1
= 500
Ω
T
A
= +25
°
C
V
CC
= 4.5 to 5.5 V
R
1
= 500
Ω
T
A
= -55 to +125
°
C
V
CC
= 5.0 V
R
1
= 500
Ω
T
A
= +25
°
C
C
L
= 50 pF
R
2
= 500
Ω
C
L
= 50 pF
R
2
= 500
Ω
9, 10, 11
C
L
= 50 pF
R
2
= 500
Ω
C
L
= 50 pF
R
2
= 500
Ω
9, 10, 11
C
L
= 50 pF
R
2
= 500
Ω
C
L
= 50 pF
R
2
= 500
Ω
S
UBGROUPS
9, 10, 11
M
IN
1
1.5
1
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
M
AX
7.2
7.6
6
6.6
11.2
11.8
9.4
10.2
9.7
9.6
8.3
7.8
ns
ns
U
NIT
ns
Memory
7.25.02 Rev 1
All data sheets are subject to change without notice
4
©2002 Maxwell Technologies
All rights reserved.
Octal Buffers Transceiver
T
ABLE
7. F
UNCTION
T
ABLE
INPUTS
OPERATION
OE
L
L
H
DIR
L
H
X
B data to A bus
A data to B bus
Isolation
54BCT245
F
IGURE
1. L
OAD
C
IRCUIT FOR
O
UTPUTS
Memory
Figure Note:
1.C
L
includes probe and jig capacitance.
P
ARAMETER
M
EASUREMENT
I
NFORMATION
T
EST
T
PLH
/T
PHL
T
PLZ
/T
PZL
T
PHZ
/T
PZH
S1
Open
6V
GND
F
IGURE
2. V
OLTAGE
W
AVEFORMS
P
ULSE
D
URATION
7.25.02 Rev 1
All data sheets are subject to change without notice
5
©2002 Maxwell Technologies
All rights reserved.
京公网安备 11010802033920号
EEWORLD
