3.75 pc
10.25 pc
11.25 pc
38.25 pc
4.333 pc
48.583 pc
52.5 pc
34.5 pc
44.25 pc
A-2
Technical Specifications
Figure A.1
SYM8953U Mechanical Drawing
A.1.2 Electrical Characteristics
The SYM8953U maximum power requirement, including SCSI
TERMPWR (termination power), under normal operation is as follows:
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 A is sustained no longer than 30 seconds before the self-resetting
TERMPWR short circuit protection device (F1) opens.
SCSI LVD/SE
SYM8953U
J2
CT3
CR
3
TE
R
M
F1
CT2
U1
2
U
7
CT10
J3
U4
SCSI
LV
D/
SE
Activity
J4
VR
1
CR1
CR2
U1
U3
CT
1
U2
U5
CT
4
ICT
6.533’’
5V_A
GND_A
U6
U11
U10
5V_B
GND_B
SIG2_B
SIG1_B
62
U8
U9
L2
L1
CT7
CT8
+3.3 V
CT5
U13
CT6
J1T
CT
9
01
1998
C
SIG2_A
SIG1_A
Note:
•
J1: PCI 32-bit, universal board connector.
•
J2: 68-pin HD connector.
•
J3: 68-pin HD connector.
•
J4: 4 pin low density connector.
88.
990
mm
(3
.5
in
ches)
152.4 mm (6.0 inches)
Table A.1
Maximum Power Requirements
+ 5 V DC
±
5%
1.5 A
Over the operating range 0
°
C to 55
°
C
