Figure A.1 SYM8953U Mechanical Drawing
152.4 mm (6.0 inches)
CT2 |
LVD/SE |
F1
CR3
CT3
Activity
TERM | J2 | SCSI LVD/SE |
| VR1 J4 |
|
|
|
CR1 | CR2 | CT1 |
U1 |
|
|
| U2 | SIG2_A |
| 5V_A |
|
U3 | GND_A | SIG1_A ICT |
|
| 6.533’’ |
(3.5 inches) |
|
|
|
|
|
| SCSI | ||
88.990 mm |
|
|
|
|
|
| J3 | ||
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| C 1998 | |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
U12 U7 U4
CT10
SYM8953U
U13
CT6
CT9
J1T
01
+3.3 V
L1 CT5 CT7
L2
U8
U9
CT8
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| CT4 |
| U5 |
|
|
|
|
|
|
|
|
| ||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| ||||
| U10 |
|
|
|
|
|
|
| U6 |
| ||||||
|
|
|
|
|
|
|
| U11 | ||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 5V_B |
|
| SIG2_B | ||||||
62 |
|
|
|
| GND_B |
|
| SIG1_B | ||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Note:
•J1: PCI
•J2:
•J3:
•J4: 4 pin low density connector.
A.1.2 Electrical Characteristics
The SYM8953U maximum power requirement, including SCSI TERMPWR (termination power), under normal operation is as follows:
Table A.1 Maximum Power Requirements
+ 5 V DC
±5%
1.5 A
Over the operating range 0 ° 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 A is sustained no longer than 30 seconds before the
Technical Specifications |