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G218B Datasheet, PDF (1/11 Pages) Global Mixed-mode Technology Inc – Ultra160 Multi-mode LVD/SE SCSI Terminator | |||
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Global Mixed-mode Technology Inc.
G218B
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 G218B Multi-mode LVD/SE SCSI terminator pro-
vides a smooth transition into 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 G218B 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 G218B 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 G218B 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
G218B
28 TPWR
27 TPWR
26 R9-
25 R9+
24 R8-
23 R8+
22 NC/HS GND
21 R7-
20 R7+
19 R6-
18 R6+
17 DIFFB
16 DIFFSENSE
15 M/S
SSOP-28/TSSOP-28
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
G218B
SSOP-36
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
Ver 1.4
Apr 07, 2005
TEL: 886-3-5788833
http://www.gmt.com.tw
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