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| G218A Datasheet, PDF (1/9 Pages) Global Mixed-mode Technology Inc – Multi-mode LVD/SE SCSI Terminator | |||
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Global Mixed-mode Technology Inc.
G218A
Multi-mode LVD/SE SCSI Terminator
Features
ÂAuto-selectable multi-mode Single-Ended
or LVD Termination
ÂMeets SCSI-1, SCSI-2, SCSI-3 SPI Ultra
(Fast-20), Ultra 2(SPI-2 LVD), Ultra160 stan-
dards.
ÂSupports active negation
ÂCurrent limit and thermal protection
ÂHot-Swap compatible (Single-Ended)
Â5% tolerance on SE and LVD termination
resistance
Â28 and 36 pin SSOP package
Â28 Pin SSOP: Pin Compatible with DS2119
Â36 Pin SSOP: Pin Compatible with DS2118,
LX5241 and UCC5630
Applications
ÂServer and workstation
ÂHigh-end PC
ÂIndustrial PC
ÂDisk Array (RAID)
ÂSCSI cable
General Description
The G218A Multi-mode LVD/SE SCSI terminator pro-
vides a smooth transition into the next generation of
the SCSI Parallel Interface (SPI-2). 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 G218A 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 G218A 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-2) bus architectures.
For the SE termination, one regulator and nine preci-
sion 110ohm resistors are used. For the LVD termina-
tion, the G218A integrates two regulated supplies with
nine precision resistor strings.
Pin Configuration
(Top View)
VREF 1
R1+ 2
R1- 3
R2+ 4
R2- 5
NC 6
R3+ 7
R3- 8
R4+ 9
R4- 10
R5+ 11
R5- 12
DISCNCT 13
GND 14
G218A
28 TPWR
27 TPWR
26 R9-
25 R9+
24 R8-
23 R8+
22 NC
21 R7-
20 R7+
19 R6-
18 R6+
17 DIFFB
16 DIFFSENSE
15 M/S
28Pin SSOP/TSSOP
Ver 3.3
Sep 11, 2001
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
1
G218A
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
TEL: 886-3-5788833
http://www.gmt.com.tw
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