54BCT245 - Transceiver, 8 Bit

54BCT245
Octal Buffers Transceiver
Memory
Logic Diagram
FEATURES:
DESCRIPTION:
• 3-state outputs drive bus lines or buffer memory address
registers
• RAD-PAK® radiation-hardened against natural space radiation
• Total dose hardness:
- > 100 krad (Si), depending upon space mission
• Package:
- 20-pin RAD-PAK® flat package
• Operating temperature range: -55 to +125°C
• Bi-CMOS design
• ESD protection exceeds 2000V
Maxwell Technologies’ 54BCT245 octal bus transceiver features a greater than 100 krad (Si) total dose tolerance. The
54BCT245 is designed specifically for asynchronous communication 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 RAD-PAK® packaging technology incorporates radiation shielding in the microcircuit package. 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, RAD-PAK provides greater than 100
krad (Si) radiation dose tolerance. This product is available
with screening up to Class S.
7.25.02 REV 5
(858) 503-3300 - Fax: (858) 503-3301 - www.maxwell.com
All data sheets are subject to change without notice
1
©2002 Maxwell Technologies
All rights reserved.
54BCT245
Octal Buffers Transceiver
TABLE 1. PINOUT DESCRIPTION
PIN
SYMBOL
DESCRIPTION
1
DIR
2-9
A1-A8
Bi-directional I/O’s with Tri-State
10
GND
Ground
11-18
B8-B1
Bi-directional I/O’s with Tri-State
19
OE
Output Enable
20
VCC
Supply Power
Directional Control Input
TABLE 2. 54BCT245 ABSOLUTE MAXIMUM RATINGS 1
PARAMETER
MIN
MAX
UNIT
VCC
-0.5
7.0
V
-0.5
-0.5
7.0
5.5
Input Voltage Range
Control Input 3/I/O Ports2
I/O Ports3
VI
Voltage Range Applied to any Output in the Disable or Power-Off
State
VO
-0.5
7.0
V
Voltage Range Applied to any Output in High State
VO
-0.5
VCC
V
Current Into Any Output in the Low State
IO
--
96
mA
Total Power Dissipation @ TA = +55 ° C 3
PD
--
651
mW
IIK (VI < 0)
--
-30
mA
Operating Temperature Range
TA
-55
125
°C
Storage Temperature Range
TS
-65
150
°C
Input Clamp Current
Memory
Supply Voltage Range
SYMBOL
V
1. Stresses above the absolute maximum rating may cause permanent damage to the device. Extended operation at the maximum 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 PD due to short circuit test, e.g. IDS. The PD number is based upon dc values.
TABLE 3. DELTA LIMITS
PARAMETER
VARIATION
ICC(OL)
±10% of specified value in Table 5
ICC(OH)
±10% of specified value in Table 5
ICC(OD)
±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.
54BCT245
Octal Buffers Transceiver
TABLE 4. 54BCT245 RECOMMENDED OPERATING CONDITIONS1
PARAMETER
SYMBOL
MIN
MAX
UNIT
Supply Voltage
VCC
4.5
5.5
V
High-Level Input Voltage
VIH
2.0
--
V
Low-Level Input Voltage
VIL
--
0.8
V
High-Level Output Current
A Port
B Port
IOH
--
Low-Level Output Current
A Port
B Port
IOL
Input Clamp Current
IIK
--
-18
mA
ΘJC
--
5.56
°C/W
TA
-55
125
°C
mA
-3
-12
--
mA
20
48
Thermal Impedance — Flat Package
Operating Temperature
Memory
1. All unused control inputs must be held high or low to ensure proper device operation.
TABLE 5. 54BCT245 DC ELECTRICAL CHARACTERISTICS
(VCC = 5V ±10%, TA = -55 ° C TO 125 ° C, UNLESS OTHERWISE SPECIFIED)
PARAMETER
SYMBOL
TEST CONDITIONS
SUBGROUPS
MIN
MAX
UNIT
Input Clamp Voltage
VIK
VCC = 4.5 V
II = -18.0 mA
1, 2, 3
--
-1.2
V
High-Level Output Voltage
VOH
VCC = 4.5 V Port A
IOH = -1 mA
1, 2, 3
2.5
--
V
IOH = -3 mA
2.4
--
IOH = -3 mA
2.4
--
IOH = -12 mA
2
--
--
0.5
--
0.55
Port B
Low-Level Output Voltage
VOL
Input Current
II
VCC = 4.5 V Port A
IOL = 20 mA
Port B
IOL = 48 mA
VCC = 5.5 V A or B Port
VI = 5.5V
1, 2, 3
1, 2, 3
1
Control Input
High Level Input
Current1
Low Level Input
Current2
IIH
VCC = 5.5 V A or B Port
VCC = 5.5 V A or B Port
VI = 2.7 V
1, 2, 3
VIN = 0.5 V
1, 2, 3
--
70
µA
--
20
µA
--
-0.65
mA
Control Input
Short-circuit Output Current
2
IOS
VCC = 5.5 V A Port
mA
0.1
Control Input
IIL
V
-1.2
VO = 0 V
1, 2, 3
B Port
-60
-150
-100
-225
mA
Supply Current, Outputs High
ICCH
A to B
VCC = 5.5 V
1, 2, 3
--
57
mA
Supply Current, Outputs Low
ICCL
A to B
VCC = 5.5 V
1, 2, 3
--
90
mA
7.25.02 Rev 1
All data sheets are subject to change without notice
3
©2002 Maxwell Technologies
All rights reserved.
54BCT245
Octal Buffers Transceiver
TABLE 5. 54BCT245 DC ELECTRICAL CHARACTERISTICS
(VCC = 5V ±10%, TA = -55 ° C TO 125 ° C, UNLESS OTHERWISE SPECIFIED)
PARAMETER
SYMBOL
Supply Current, Outputs Disabled to High Impedance State
ICCZ
Input Capacitance
Input Output Capacitance
TEST CONDITIONS
SUBGROUPS
MIN
MAX
UNIT
VCC = 5.5 V
1, 2, 3
--
15
mA
Ci3
VI = 2.5 V or Control Input VCC = 5.5 V
0.5V
1, 2, 3
Cio3
VCC = 5.5 V
A to B
7
VI = 2.5 V or
0.5 V
B to A
pF
9
pF
12
1. For I/O ports, the parameters IIH and IIL 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.
TABLE 6. 54BCT245 AC ELECTRICAL CHARACTERISTICS
Memory
(VCC = 5V ±10%, TA = -55 ° C TO 125 ° C, UNLESS OTHERWISE SPECIFIED)
PARAMETER
SYMBOL
Propagation Delay Time
from A or B to B or A
tPLH
VCC = 4.5 to 5.5 V
R1 = 500 Ω
tPHL
TA = -55 to +125 ° C
tPLH
VCC = 5.0 V
R1 = 500 Ω
tPHL
TA = +25 ° C
tPZH
VCC = 4.5 to 5.5 V
R1 = 500 Ω
tPZL
TA = -55 to +125 ° C
tPZH
VCC = 5.0 V
R1 = 500 Ω
tPZL
TA= +25 ° C
tPHZ
VCC = 4.5 to 5.5 V
R1 = 500 Ω
tPLZ
TA = -55 to +125 ° C
tPHZ
VCC = 5.0 V
R1 = 500 Ω
tPLZ
TA= +25 ° C
Output Enable Time
OE to Yn
Output Disable Time
OE to Yn
TEST CONDITIONS
CL = 50 pF
R2 = 500 Ω
SUBGROUPS
MIN
MAX
UNIT
9, 10, 11
1
7.2
ns
1.5
7.6
1
6
1.5
6.6
1.5
11.2
1.5
11.8
1.5
9.4
1.5
10.2
1.5
9.7
1.5
9.6
1.5
8.3
1.5
7.8
CL = 50 pF
R2 = 500 Ω
CL = 50 pF
R2 = 500 Ω
9, 10, 11
CL = 50 pF
R2 = 500 Ω
CL = 50 pF
R2 = 500 Ω
CL = 50 pF
R2 = 500 Ω
7.25.02 Rev 1
9, 10, 11
ns
ns
All data sheets are subject to change without notice
4
©2002 Maxwell Technologies
All rights reserved.
54BCT245
Octal Buffers Transceiver
TABLE 7. FUNCTION TABLE
INPUTS
OPERATION
OE
DIR
L
L
B data to A bus
L
H
A data to B bus
H
X
Isolation
FIGURE 1. LOAD CIRCUIT FOR OUTPUTS
Memory
Figure Note:
1.CL includes probe and jig capacitance.
PARAMETER MEASUREMENT INFORMATION
TEST
S1
TPLH/TPHL
Open
TPLZ/TPZL
6V
TPHZ/TPZH
GND
FIGURE 2. VOLTAGE WAVEFORMS PULSE DURATION
7.25.02 Rev 1
All data sheets are subject to change without notice
5
©2002 Maxwell Technologies
All rights reserved.
54BCT245
Octal Buffers Transceiver
FIGURE 3. OUTPUT ENABLE TIMING
FIGURE 4. VOLTAGE SETUP AND HOLD TIMES
Memory
FIGURE 5. PROPAGATION DELAY TIMES INVERTING AND NON-INVERTING OUTPUTS
Figure Notes:
2. All input pulses are supplied by generators having the following characteristics: PRR < 10 MHz, ZO = 50Ω, tr < 2.5 ns, tf < 2.5
ns.
3. Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control.
Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control.
4.The outputs are measured one at a time with one transition per measurement.
7.25.02 Rev 1
All data sheets are subject to change without notice
6
©2002 Maxwell Technologies
All rights reserved.
54BCT245
Octal Buffers Transceiver
Memory
20 PIN RAD-PACK® FLAT PACKAGE
DIMENSION
SYMBOL
MIN
NOM
MAX
A
0.128
0.141
0.154
b
0.015
0.017
0.022
c
0.003
0.005
0.009
D
0.470
0.480
0.490
E
0.287
0.295
0.303
E1
--
--
0.333
E2
0.155
0.160
--
E3
0.030
0.068
--
e
0.050BSC
L
0.370
0.380
0.390
Q
0.035
0.039
0.042
S1
0.005
0.007
--
N
20
F20-01
Note: All dimensions in inches
7.25.02 Rev 1
All data sheets are subject to change without notice
7
©2002 Maxwell Technologies
All rights reserved.
54BCT245
Octal Buffers Transceiver
Important Notice:
These data sheets are created using the chip manufacturer’s published specifications. Maxwell Technologies verifies
functionality by testing key parameters either by 100% testing, sample testing or characterization.
The specifications presented within these data sheets represent the latest and most accurate information available to
date. However, these specifications are subject to change without notice and Maxwell Technologies assumes no
responsibility for the use of this information.
Maxwell Technologies’ products are not authorized for use as critical components in life support devices or systems
without express written approval from Maxwell Technologies.
Any claim against Maxwell Technologies must be made within 90 days from the date of shipment from Maxwell Technologies. Maxwell Technologies’ liability shall be limited to replacement of defective parts.
Memory
7.25.02 Rev 1
All data sheets are subject to change without notice
8
©2002 Maxwell Technologies
All rights reserved.
54BCT245
Octal Buffers Transceiver
Product Ordering Options
Model Number
54BCT245
RP
F
X
Option Details
Feature
Monolithic
S = Maxwell Class S
B = Maxwell Class B
I = Industrial (testing @ -55°C,
+25°C, +125°C)
E = Engineering (testing @ +25°C)
Package
F = Flat Package
Radiation Feature
RP = RAD-PAK® package
Base Product
Nomenclature
Octal Buffers Transceiver
7.25.02 Rev 1
All data sheets are subject to change without notice
Memory
Screening Flow
9
©2002 Maxwell Technologies
All rights reserved.
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