P
RELIMINARY
3.3V ABT Octal Bus Transceiver
with 3-State Output
54LVTH245A
Memory
Logic Diagram (Positive Logic)
F
EATURES
:
• 3.3V ABT octal bus transceiver with 3-state outputs
• R
AD
-P
AK
® radiation hardened against natural space radia-
tion
• Total dose hardness:
- >100 krad (Si), depending upon space misssion
• Package:
- 20 pin R
AD
-P
AK
® flat package
- 20 pin R
AD
-P
AK
® DIP
• Operating temperature range:
-55 to 125
°
C
• Supports mixed-mode signal operation
- 5V input and output voltages with 3.3V V
CC
• Supports unregulated battery operation down to 2.7V.
• Typical VOLP (output ground bounce) < 0.8V at V
CC
=3.3V,
T
A
= 25
°
C
• Latch-up performance exceeds 500mA per JEDEC stan-
dard
• Supports live insertion
• Bus-hold data inputs eliminate the need for external pullup
resistors
D
ESCRIPTION
:
Maxwell Technologies’ 54LVTH245A 8-bit octal transceiver
micro-circuit features a greater than 100 krad (Si) total dose
tolerance, depending upon space mission. The 54LVTH245A
is designed specifically for low voltage (3.3V) V
CC
operation,
but with the capability to provide a TTL interface to a 5V sys-
tem environment. It is designed for asynchronous communica-
tion between data buses. The device transmits data from the
A bus to the B bus or from the B bus to the A bus depending
upon the logic 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. The 54LVTH245A active
bus-hold circuitry is provided to prevent floating data inputs at
a valid logic level and to eliminate the need for external 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 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.
1000597
12.19.01 Rev 1
All data sheets are subject to change without notice
1
(858) 503-3300 - Fax: (858) 503-3301 - www.maxwell.com
©2001 Maxwell Technologies
All rights reserved.
MAXWELL [ MAXWELL TECHNOLOGIES ]
