MAXIM DS2129 Technical data
General Description
The DS2129 is a triple-output voltage regulator for
27-line, low-voltage-differential (LVD) SCSI termination
for SPI-2 and SPI-3 applications using LVD termination
networks. The device provides reference voltages and
bias currents for LVD-termination resistor pi (π) networks. With a pi network (475Ω, 121Ω, 475Ω), the
DS2129 meets the common-mode bias, differential
bias, and termination-impedance requirements of SPI-2
(Ultra2) and SPI-3 (Ultra3). The device also provides a
1.3V output for DIFFSENSE signaling, and includes protection features such as thermal shutdown and active
current limiting.
Applications
SCSI Array Backplane
SCSI Cables
Features
♦ Fully Compliant with SPI-2 and SPI-3
♦ 2.7V to 5.25V Operation
♦ Differential Fail-Safe Bias
DS2129
LVD SCSI 27-Line Regulator
______________________________________________ Maxim Integrated Products 1
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
N.C.
N.C.
N.C.
HS_GND
HS_GND
HS_GND
HS_GND
N.C.
N.C.
TOP VIEW
SO (150 mils)
TERMPWR
REG2
REG1
GND
HS_GND
DIFFSENSE
N.C.
DS2129
Pin Configuration
Ordering Information
Block Diagram
Rev 1; 2/06
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.
PART*
PINPACKAGE
TOP
MARK**
DS2129S 5 16 SO
DS2129
DS2129S+ 5 16 SO
DS2129
DS2129S/T&R 5 16 SO
DS2129
DS2129S+T&R
5 16 SO
DS2129
+Denotes lead-free package.
*All devices rated for the commercial (0°C to +70°C) tempera-
ture range.
**A “+” anywhere on the topmark denotes a lead-free package.
查询DS2065W供应商
TERMPWR
BANDGAP
(1.25V)
PTAT
REF125
THERMAL
SHUTDOWN
TS
VOLTAGE (V)
REFERENCES
REF175
REF130
REF075
GND
DS2129
TS
1.75V
REG1
TS
0.75V
REG2
TS
1.3V
DIFFSENSE
DS2129
LVD SCSI 27-Line Regulator
2 _____________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(TERMPWR = 3.3V, TA= 0°C to +70°C, unless otherwise noted.) (Note 1)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
TERMPWR, DIFFSENSE, REG1, REG2 ....................-0.3V, +6.0V
REG1, REG2 Continuous Output Current.......................±200mA
Continuous Power Dissipation (T
A
= +70°C)
16-Pin SO (derate 13mW/°C above +70°C)........................1W
Operating Temperature Range...............................0°C to +70°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Soldering Temperature .......................................See IPC/JEDEC
J-STD-020A Specification
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
TERMPWR
TERMPWR Supply Current I
TERM
No load 40 mA
TERMPWR Voltage V
TERM
2.7
V
V
REF
REGULATOR
0.75V Regulator Output Voltage,
REG2
V
075
I
OUT
= ±125mA 0.7
0.8 V
0.75V Regulator Source Current,
REG2
V
OUT
= 0.25V
mA
0.75V Regulator Sink Current,
REG2
V
OUT
= 1.25V
mA
0.75V Regulator Source Current
Limit
V
OUT
= 0V
mA
0.75V Regulator Sink Current
Limit
V
OUT
= 3.3V
mA
1.75V Regulator Output Voltage,
REG1
V
175
I
OUT
= ±125mA 1.7
1.8 V
1.75V Regulator Source Current,
REG1
V
OUT
= 1.25V
mA
1.75V Regulator Sink Current,
REG1
V
OUT
= 2.25V
mA
1.75V Regulator Source Current
Limit
V
REF
= 0V
mA
1.75V Regulator Sink Current
Limit
V
REF
= 3.3V
mA
DIFFSENSE OUTPUT
DIFFSENSE Driver Output
Voltage
V
DSO
-5mA ≤ I
DIFFSENSE
≤ 50µA 1.2 1.3 1.4 V
DIFFSENSE Driver Source
Current
I
DSH
V
DIFFSENSE
= 0V -5 -15 mA
DIFFSENSE Driver Sink Current I
DSL
V
DIFFSENSE
= 2.4V 100
µA
5.25
0.75
I
SRC_075
I
SINK_075
I
SRCL_075
I
SINKL_075
I
SRC_175
I
SINK_175
I
SRCL_175
I
SINKL_175
+200
-700
1.75
+200
-700
-200
+700
-200
+700
200
Loading...