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PDF DS2120B Data sheet ( Hoja de datos )
| Número de pieza | DS2120B | |
| Descripción | Ultra3 LVD SCSI Terminator | |
| Fabricantes | Dallas Semiconducotr | |
| Logotipo |  |
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www.maxim-ic.com
DS2120
Ultra3 LVD SCSI Terminator
FEATURES
§ Fully compliant with Ultra3, Ultra160,
Ultra320, and Ultra2 (LVD only) SCSI
§ Provides low-voltage differential (LVD)
termination for nine signal line pairs
§ Zero-temperature coefficient-termination
resistors
§ Auto-select of LVD termination
§ 5% tolerance on LVD termination resistance
§ Low power-down capacitance of 3pF
§ Built- in mode change filter/delay
§ On-board thermal-shutdown circuitry
§ SCSI bus hot-plug compatible
PIN ASSIGNMENT
VREF
R1P
R1N
R2P
R2N
HS GND
R3P
R3N
R4P
R4N
R5P
R5N
ISO
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28 TPWR
27 TPWR
26 R9N
25 R9P
24 R8N
23 R8P
22 HS GND
21 R7N
20 R7P
19 R6N
18 R6P
17 DIFF_CAP
16 DIFFSENSE
15 MSTR/SLV
DS2120E 28-Pin TSSOP
APPLICATIONS
§ Raid Systems
§ SCSI Host Bus Adapter Cards (HBA)
§ Servers
§ SCSI Cables
§ Network Attached Storage (NAS)
§ Storage Area Networks (SANs)
ORDERING INFORMATION
DS2120E 28-Pin TSSOP 0°C to +70°C
DS2120B 36-Pin SSOP 0°C to +70°C
VREF
NC
NC
R1P
R1N
R2P
R2N
HS GND
HS GND
HS GND
R3P
R3N
R4P
R4N
R5P
R5N
ISO
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
36 TPWR
35 NC
34 LVD
33 NC
32 R9N
31 R9P
30 R8N
29 R8P
28 HS GND
27 HS GND
26 HS GND
25 R7N
24 R7P
23 R6N
22 R6P
21 DIFF_CAP
20 DIFFSENSE
19 MSTR/SLV
DS2120B 36-Pin SSOP
DESCRIPTION
The DS2120 Ultra3 LVD SCSI terminator is a low-voltage differential (LVD) terminator. If the device is
connected in an LVD-only bus, the DS2120 uses LVD termination. If any single-ended (SE) or high-
voltage differential (HVD) devices are connected to the bus, the DS2120 disconnects from the bus. This
is accomplished inside the part automatically by sensing the voltage on the SCSI bus DIFFSENS line.
For the LVD termination, the DS2120 integrates two current sources with nine precision resistor strings.
Three DS2120 terminators are needed for a wide SCSI bus.
Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple
revisions of any device may be simultaneously available through various sales channels. For information about device
errata, click here: http://dbserv.maxim-ic.com/errata.cfm.
1 of 10
042602
1 page  
Figure 2. SCSI BUS CONFIGURATION
DS2120
5 of 10
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| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet DS2120B.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| DS2120 | Ultra3 LVD SCSI Terminator | Dallas Semiconducotr |
| DS2120B | Ultra3 LVD SCSI Terminator | Dallas Semiconducotr |
| DS2120E | Ultra3 LVD SCSI Terminator | Dallas Semiconducotr |
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