SS8218 Datasheet, PDF (1/11 Pages) Silicon Standard Corp. – Ultra160 Multi-mode LVD/SE SCSI Terminator

SS8218
Ultra160 Multi-mode LVD/SE SCSI Terminator
Features
„Auto-selectable multi-mode Single-Ended
or LVD Termination
„Meets SCSI-1, SCSI-2, SCSI-3 SPI Ultra
(Fast-20), Ultra 2(SPI-2 LVD), Ultra160 (SPI-3
LVD) standards.
„Supports active negation
„3pF channel capacitance
„Thermal protection
„Hot-swap compatible
„5% tolerance on SE and LVD termination
resistance
„28 and 36 pin SSOP package
„28 Pin SSOP: Pin Compatible with DS2119
„36 Pin SSOP: Pin Compatible with DS2118,
LX5241 and UCC5630
Applications
„Server and workstation
„High-end PC
„Industrial PC
„Disk Array (RAID)
„SCSI cable
General Description
The SS8218 Multi-mode LVD/SE SCSI terminator pro-
vides a smooth transition to the next generation of
the SCSI Parallel Interface (SPI-3). It automatically
senses the bus, via DIFFSENS, and switches the ter-
mination to either single-ended (SE) or low voltage
differential (LVD) SCSI, dependent on which type of
devices are connected to the bus. If the SS8218 de-
tects a HVD SCSI device, it switches to a high imped-
ance state. For a 16-bit Wide SCSI bus to be opera-
tional, three SS8218 terminators are needed.
The Multi-mode terminator contains all functions re-
quired to terminate and auto detect and switch modes
for SCSI Parallel Interface (SPI) bus architectures. For
the SE termination, one regulator and nine precision
110ohm resistors are used. For the LVD termination,
the SS8218 integrates 18 regulated supplies with nine
precision resistor strings.
Pin Configuration
VREF 1
R1+ 2
R1- 3
R2+ ⁴
R2- 5
NC/HS GND ₆
R3+ ₇
R3- ₈
R4+ ₉
R4- 10
R5+ 11
R5- ¹²
DISCNCT 13
GND 14
28 TPWR
27 _TPWR
26 R9-
25 NRC9+/HS GND
24 R8-
23 R8+
22 NC/HS GND
21 R7-
20 _R7+
19 R6-
18 R6+
17 DIFFB
16 DIFFSENSE
15 M/S
28Pin SSOP/TSSOP
VREF 1
NC 2
NC 3
R1+ 4
R1- 5
R2+ 6
R2- 7
HS/GND 8
HS/GND ⁹
HS/GND 10
R3+ 11
R3- 12
R4+ 13
R4- ¹⁴
R5+ 15
R5- 16
DISCNCT ¹⁷
GND ¹⁸
36 TPWR
35 HVD
34 LVD
33 SE
32 R9-
31 _R9+
30 _R8-
29 R8+
28 HS/GND
27 HS/GND
26 HS/GND
25 R7-
24 R7+
23 _R6-
22 _R6+
21 DIFFB
20 _DIFFSENSE
19 M/S
36Pin SSOP
Rev.2.01 6/06/2003
www.SiliconStandard.com
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