DS2127+ Maxim Integrated Products, DS2127+ Datasheet

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DS2127+

Manufacturer Part Number
DS2127+
Description
IC TERM SCSI LVD/SE 48-LQFP
Manufacturer
Maxim Integrated Products
Type
SCSI, LVD, SEr
Datasheet
1.DS2127.pdf (6 pages)

Specifications of DS2127+

Number Of Terminations
14
Voltage - Supply
2.7 V ~ 5.5 V
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
48-LQFP
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
Number Of Bits
14
Resistance
110 Ohms
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The DS2127 Ultra3 LVD/SE SCSI terminator provides
low-voltage differential (LVD)/single-ended (SE) termi-
nations for 14 SCSI lines. Through the voltage on the
DIFF_CAP pin, the device detects the types of drivers
on the bus. If the device is connected in an LVD-only
bus, the DS2127 provides LVD termination. If any sin-
gle-ended devices are connected to the bus, the
DS2127 uses SE termination. If any high-voltage differ-
ential (HVD) devices are connected to the bus, the
DS2127 isolates itself from the SCSI bus. The mode
change has a built-in delay that is determined by an
integrated SPI-3 mode change filter/delay. The termi-
nating resistors can also be disconnected from the bus
by asserting the ISO pin.
For the LVD termination, the DS2127 provides 14 pre-
cisely trimmed resistors. Each resistor is biased with
two current sources to a fail-safe state. For SE termina-
tion, the DS2127 provides 14 precision 110Ω resistors
and one regulator for active-negation bias.
Rev 2; 1/06
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
TOP VIEW
SCSI Array Backplane
SCSI Cables
R2N
R3N
R4N
R5N
R6N
R7N
R2P
R3P
R4P
R5P
R6P
R7P
13
14
15
16
17
18
19
20
21
22
23
24
Ultra3 LVD/SE SCSI 14-Line Terminator
General Description
DS2127
Pin Configuration
LQFP
Applications
______________________________________________ Maxim Integrated Products
48
47
46
45
44
43
42
41
40
39
38
37
R13N
R13P
R12N
R12P
R11N
R11P
R10N
R10P
R9N
R9P
R8N
R8P
♦ Fully Compliant with Ultra2, Ultra3, Ultra160, and
♦ Provides LVD/SE Termination for 14 Signal Pairs
♦ Auto-Selection of LVD or SE Termination
♦ 5% Tolerance on SE and LVD Termination
♦ Low 3pF Power-Down Capacitance
♦ Built-In Mode-Change Filter/Delay
♦ On-Board Thermal-Shutdown Circuitry
♦ SCSI Bus Hot-Plug Compatible
♦ Fully Supports Actively Negated SE SCSI Signals
+Denotes a lead-free/RoHS-compliant package.
*All devices rated over the 0°C to +70°C commercial tempera-
ture range.
**The top mark includes a "+" on lead-free packages.
DS2127
DS2127+
DS2127/T&R
DS2127+T&R
Ultra320 SCSI Standards
Resistance
PART*
VOLTAGE
(V)
3.3
3.3
3.3
3.3
Ordering Information
PIN-PACKAGE
48 LQFP
48 LQFP
48 LQFP/Tape
and Reel
48 LQFP/Tape
and Reel
Features
MARK**
DS2127
DS2127
DS2127
DS2127
TOP
1

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DS2127+ Summary of contents

Page 1

... Built-In Mode-Change Filter/Delay ♦ On-Board Thermal-Shutdown Circuitry ♦ SCSI Bus Hot-Plug Compatible ♦ Fully Supports Actively Negated SE SCSI Signals Applications PART* DS2127 DS2127+ DS2127/T&R 48 R13N DS2127+T&R 47 R13P 46 R12N +Denotes a lead-free/RoHS-compliant package. 45 R12P *All devices rated over the 0°C to +70°C commercial tempera- 44 R11N ture range ...

Page 2

Ultra3 LVD/SE SCSI 14-Line Terminator ABSOLUTE MAXIMUM RATINGS Voltage Range on All Pins Relative to Ground ......-0.3V to +6.0V V Continuous Output Current....................................±200mA REF Operating Temperature Range...............................0°C to +70°C Junction Temperature ......................................................+150°C Stresses beyond those listed under “Absolute Maximum Ratings” ...

Page 3

Ultra3 LVD/SE SCSI 14-Line Terminator ELECTRICAL CHARACTERISTICS (continued) (TPWR = TPWR(MIN) TPWR(MAX) A PARAMETER SYMBOL V REGULATOR REF 1.25V Regulator Line Regulation 2.85V Regulator 2.85V Regulator Short-Circuit Source Current 2.85V Regulator Short-Circuit Sink Current 2.85V ...

Page 4

Ultra3 LVD/SE SCSI 14-Line Terminator 2.15V DIFF_CAP 0.6V ISO SE HVD/ISO LVD Figure 1. Block Diagram PIN NAME Signal Termination. Connect to SCSI bus signal lines. Asserting ISO removes the terminators from the 1, 2, 11–24, SCSI bus ...

Page 5

Ultra3 LVD/SE SCSI 14-Line Terminator 2.2µF 2.2µF Figure 2. Typical Operating Circuit Detailed Description The DS2127 provides dual-mode active terminators with auto-switching SE and LVD termination for 14 SCSI lines. The DIFFSENSE signal performs mode detection and selection. In LVD ...

Page 6

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 6 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2006 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc ...

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