DS2125+ Maxim Integrated, DS2125+ Datasheet

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DS2125+

Manufacturer Part Number
DS2125+
Description
SCSI Interface IC
Manufacturer
Maxim Integrated
Series
DS2125r
Type
SCSI Terminationr
Datasheet

Specifications of DS2125+

Rohs
yes
Operating Supply Voltage
2.7 V to 5.5 V
Supply Current
32 mA
Maximum Operating Temperature
+ 70 C
Minimum Operating Temperature
0 C
Mounting Style
SMD/SMT
Package / Case
TQFP-48
Resistance
110 Ohms
Part # Aliases
90-21250+000
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: www.maxim-ic.com/errata.
www.maxim-ic.com
GENERAL DESCRIPTION
The DS2125 Ultra3 LVD/SE SCSI terminator is both
a low-voltage differential (LVD) and single-ended
(SE) terminator. The multimode operation enables
the designer to implement LVD in current products
while
compatibility with legacy devices. If the device is
connected in an LVD-only bus, the DS2125 uses
LVD termination. If any SE devices are connected to
the bus, the DS2125 uses SE termination, which is
accomplished automatically inside the part by
sensing the voltage on the SCSI bus DIFFSENS line.
For the LVD termination, the DS2125 integrates two
current sources with 15 precision resistor strings. For
the SE termination, one regulator and 15 precision
110Ω resistors are used. Two DS2125 terminators
are needed for a wide SCSI bus.
APPLICATIONS
Raid Systems
SCSI Host Bus Adapter (HBA) Cards
Servers
SCSI Cables
Network Attached Storage (NAS)
Storage Area Networks (SANs)
ORDERING INFORMATION
*
range, 0
**The top mark includes a “+” for lead-free packages.
+Denotes lead-free/RoHS-compliant package.
All devices rated over the commercial operating temperature
DS2125
DS2125+
DS2125/T&R
DS2125+T&R
PART*
°
C to +70
allowing
°
C.
48 LQFP
48 LQFP
48 LQFP/Tape and Reel
48 LQFP/Tape and Reel
the
PIN-PACKAGE
end
user
SE
TOP MARK**
DS2125
DS2125
DS2125
DS2125
backward
Ultra3 LVD/SE SCSI 15-Line Terminator
1 of 7
FEATURES
PIN CONFIGURATION
TOP VIEW
HS_GND
HS_GND
HS_GND
HS_GND
HS_GND
HS_GND
Fully Compliant with Ultra3 SCSI
Provides Multimode Low-Voltage
Differential/Single-Ended (LVD/SE)
Termination for 15 Signal Line Pairs
Auto-Selection of LVD or SE Termination
5% Tolerance on SE and LVD Termination
Resistance
Low 3pF Power-Down Capacitance
On-Board Thermal-Shutdown Circuitry
SCSI Bus Hot-Plug Compatible
Fully Supports Actively Negated SE SCSI
Signals
V
GND
R1N
R2N
R3N
R4N
R5N
R6N
R7N
R8N
R1P
R2P
R3P
R4P
R5P
R6P
R7P
R8P
REF
13
14
15
16
17
18
19
20
21
22
23
24
12
25
11
26
10
27
Semiconductor
9
28
LQFP (1.4mm)
8
29
DS2125
Dallas
7
30
6
31
5
32
4
33
3
34
DS2125
2
35
REV: 012306
36
1
40
48
47
46
45
44
43
42
41
39
38
37
DIFF_CAP
HS_GND
HS_GND
HS_GND
TPWR
R15N
R15P
R14N
R14P
R13N
R13P
R12N
R12P
R11N
R11P
R10N
R10P
R9N
R9P
ISO
DIFFSENSE
HS_GND
HS_GND
HS_GND

Related parts for DS2125+

DS2125+ Summary of contents

Page 1

... Storage Area Networks (SANs) ORDERING INFORMATION PART* PIN-PACKAGE DS2125 48 LQFP DS2125+ 48 LQFP DS2125/T&R 48 LQFP/Tape and Reel DS2125+T&R 48 LQFP/Tape and Reel * All devices rated over the commercial operating temperature ° ° range +70 C. **The top mark includes a “+” for lead-free packages. ...

Page 2

ABSOLUTE MAXIMUM RATINGS V , ISO, GND, DIFFSENSE, DIFF_CAP, TPWR, RxP, RxN ( 15)………………………………-0.3V, +6.0V REF V Continuous Output Current………………………………………………………………………………………±200mA REF Continuous Power Dissipation (T Operating Temperature Range………………………………………………………………………………….0°C to +70°C Junction Temperature…………………………………………………………………………………………………...+150°C Storage Temperature Range………………………………………………………………………………...-65°C ...

Page 3

ELECTRICAL CHARACTERISTICS (continued) (TPWR = 3.3V 0°C to +70°C, unless otherwise noted.) A PARAMETER SYMBOL V REGULATOR REF 2.85V Regulator Line Regulation DIFFSENS OUTPUT DIFFSENS Driver Output V DSO Voltage DIFFSENS Driver Source I DSH Current DIFFSENS Driver ...

Page 4

Figure 1. Block Diagram DIFF_CAP V REF BANDGAP 1.25V DIFFSENSE THERMAL- SHUTDOWN CIRCUITRY SE DIFFENSE LVD CIRCUITRY HVD V REF + - 10Ω 10Ω Dallas Semiconductor DS2125 + - ISO CONTROL LOGIC R1N R15N R1P ...

Page 5

Figure 2. SCSI Bus Configuration TERMPWR TPWR ISO DIFFSENS V DIFF_CAP REF 4.7µF 0.1µF TPWR ISO DIFFSENS V DIFF_CAP REF 4.7µF Note: The following terms are used throughout this data sheet: DIFFSENS: Refers to the SCSI bus signal. DIFFSENSE: Refers ...

Page 6

The DS2125’s DIFF_CAP pin monitors the DIFFSENS line to determine the device’s proper operating mode. The DIFFSENSE pin can also drive the SCSI DIFFSENS line to determine the SCSI bus-operating mode. The DS2125 switches to the termination mode that is ...

Page 7

... The Maxim logo is a registered trademark of Maxim Integrated Products, Inc. The Dallas logo is a registered trademark of Dallas Semiconductor. ...

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