Avago Technologies LSI53C120 - Manual (Page 10)

2 LSI20101/LSI20102 SCSI Bus Boards
1.1 Features
The LSI20101/LSI20102 boards include these features:
•
Two 16-bit SCSI interfaces logically connected through the
LSI53C120 Bus Expander chip
•
Active termination on the SE buses
•
Remote termination control
•
68-pin high density connectors
•
Configuration switches for enabling termination power (TERMPWR)
•
LEDs indicating SCSI bus activity and TERMPWR fault
•
Wide Ultra SCSI data transfer capability
1.2 Physical Characteristics
The LSI20101/LSI20102 boards are palm-size rectangular boards each
with opposing 68-pin connectors, a disk drive power connector, and a
subsystem interface to control termination and indicate SCSI bus activity.
The boards are mounted in an enclosure.
1.3 Electrical Characteristics
The LSI20101/LSI20102 boards’ maximum power requirements,
including SCSI TERMPWR, under normal operation are
+ 5 V DC 5% 3.1 A over the operating range of 5
°
C to 55
°
C
Under abnormal conditions such as a short on SCSI TERMPWR, + 5 V
current may be higher. At temperatures of at least 25
°
C, a current of
4.0 A is sustained no longer than 30 seconds before the self-resetting
TERMPWR short circuit protection device opens.
1.4 Thermal, Atmospheric Characteristics
The boards operate in an environment defined by the following
parameters:
•
Temperature range: 5
°
C to 55
°
C (dry bulb)
•
Relative humidity range: 5% to 90% noncondensing