1. Introduction
17
Fault Current Limits
Power Source
Minimum
Maximum
+5.0V 10.0A
15.0A
+3.3V 9.4A
14.1A
+12V 1.0A
1.5A
-12V 0.6A
0.9A
Notes:
•
The fault trip currents listed above are design values. Noisy power sources can lower the fault trip
current limits to less than the minimum design values.
•
Over-current on the -12V supply does not activate the fault trip circuit breaker and the LED will not
turn amber. -12V is over-current protected by a resettable (PTC) 0.75A fuse.
Rear-Panel I/O
The following I/O signals are available from the
J5 connector
at the back of the ZT 5504. These
signals are available for use by a rear panel transition board such as the ZT 4807.
•
Serial ports (COM1 and COM2)
•
USB Ports 0 and 1 (through cuttable trace configuration)
•
Floppy Interface
•
Keyboard
•
PS/2 mouse
•
Push button reset input
•
IDE secondary channel
•
SMBus
•
Ejector
•
Video
•
Speaker Output (AT compatible)
PCI Video
The ZT 5504 provides on-board video using the Chips and Technologies 69000 HiQVideo
Accelerator with Integrated Memory. This device is configured for PCI bus transactions at
speeds up to 33 MHz.
The 69000 incorporates 2 MB of integrated SDRAM for the graphics/video frame buffer. The
integrated SDRAM memory can support up to 83 MHz operation, thus increasing the available
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