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10.2 Memory devices
The ACU2 (v2) memory devices are summarized in the table below:
Name Memory
Volatile memory
MCU Internal 512 KB
Non-volatile memory
MCU Internal 2 MB
EEPROM 32 KB
Table 12: ACU2 (v2) memory devices
The ACU2 (v2) does not contain media storage capability (i.e., removable or non-removable
disk drives, tape drives, memory cards, etc.).
10.3 Temperature and humidity ranges
Table 13, "Temperature and humidity ranges" below shows ACU2 (v2) temperature and
humidity ranges:
Type Suggested Range
Operating Temperature Range +10°C to 32°C (50°F to 90°F)
Operating Max. Temperature Gradient 20°C (68°F) per hour
Operating Humidity Range 10% to 70% non-condensing
Storage Temperature Range 0°C to 55°C (32°F to 135°F)
Storage Max. Temperature Gradient 30°C (86°F) per hour
Storage Humidity Range 5% to 95%
Table 13: Temperature and humidity ranges
10.4 Reliability
The following table shows an ACU2 (v2)'s typical Mean Time Between Failure (MTBF) rate
for commercial off-the-shelf (COTS) and military (MIL) systems:
Category MTBF Rate
COTS 1,405,667 hours
MIL 309,154 hours
Table 14: ACU2 (v2) MTBF rates
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ACU2 (v2) Technical User Guide (Rev. A, Ver. 0)