DS2129 datasheet, PDF - EEWORLD Datasheet

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DS2129: DescriptionFixed Positive Standard Regulator, 3 Output, 0.75V1, 1.75V2, BICMOS, PDSO16, 0.150 INCH, MS-012, SOIC-16; CategoryPower/power management The power supply circuit; File Size120KB，5 Pages; ManufacturerMaxim; Websitehttps://www.maximintegrated.com/en.html

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DS2129 Overview

Fixed Positive Standard Regulator, 3 Output, 0.75V1, 1.75V2, BICMOS, PDSO16, 0.150 INCH, MS-012, SOIC-16

DS2129 Parametric

Parameter Name	Attribute value
Is it Rohs certified?	incompatible
Maker	Maxim
Parts packaging code	SOIC
package instruction	SOP,
Contacts	16
Reach Compliance Code	compliant
ECCN code	EAR99
Maximum input voltage	5.25 V
Minimum input voltage	2.7 V
JESD-30 code	R-PDSO-G16
JESD-609 code	e0
length	9.9 mm
Humidity sensitivity level	1
Number of functions	1
Output times	3
Number of terminals	16
Working temperatureTJ-Max	150 °C
Maximum output voltage 1	0.8 V
Minimum output voltage 1	0.7 V
Nominal output voltage 1	0.75 V
Maximum output voltage 2	1.8 V
Minimum output voltage 2	1.7 V
Nominal output voltage 2	1.75 V
Package body material	PLASTIC/EPOXY
encapsulated code	SOP
Package shape	RECTANGULAR
Package form	SMALL OUTLINE
Peak Reflow Temperature (Celsius)	240
Certification status	Not Qualified
Regulator type	FIXED POSITIVE MULTIPLE OUTPUT STANDARD REGULATOR
Maximum seat height	1.75 mm
surface mount	YES
technology	BICMOS
Terminal surface	TIN LEAD
Terminal form	GULL WING
Terminal pitch	1.27 mm
Terminal location	DUAL
Maximum time at peak reflow temperature	NOT SPECIFIED
width	3.9 mm

DS2129 Preview

Rev 0; 4/04

LVD SCSI 27-Line Regulator

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) net-

works. 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 pro-

tection features such as thermal shutdown and active

current limiting.

♦

2.7V to 5.25V Operation

♦

Differential Fail-Safe Bias

Features

♦

Fully Compliant with SPI-2 and SPI-3

DS2129

Applications

SCSI Array Backplane

SCSI Cables

Block Diagram

PART

TERMPWR

Ordering Information

TEMP RANGE

0°C to +70°C

PIN-

PACKAGE

16 SO

TOP

MARK

DS2129

PTAT

BANDGAP

(1.25V)

REF125

THERMAL

SHUTDOWN

DS2129

REFERENCES

REF175

1.75V

REG1

Pin Configuration

TOP VIEW

REF130

N.C. 1

TERMPWR 2

0.75V

REG2

16 N.C.

15 N.C.

14 HS_GND

REG2 3

GND 4

DS2129

13 HS_GND

12 HS_GND

11 HS_GND

10 N.C.

N.C.

REF075

1.3V

DIFFSENSE

HS_GND 5

REG1 6

DIFFSENSE 7

N.C. 8

GND

______________________________________________

Maxim Integrated Products

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.

LVD SCSI 27-Line Regulator

DS2129

ABSOLUTE MAXIMUM RATINGS

TERMPWR, DIFFSENSE, REG1, REG2 ....................-0.3V, +6.0V

REG1, REG2 Continuous Output Current.......................±200mA

Continuous Power Dissipation (T

= +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

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.

ELECTRICAL CHARACTERISTICS

(TERMPWR = 3.3V, T

= 0°C to +70°C, unless otherwise noted.) (Note 1)

PARAMETER

TERMPWR

TERMPWR Supply Current

TERMPWR Voltage

REF

REGULATOR

0.75V Regulator Output Voltage,

REG2

0.75V Regulator Source Current,

REG2

0.75V Regulator Sink Current,

REG2

0.75V Regulator Source Current

Limit

0.75V Regulator Sink Current

Limit

1.75V Regulator Output Voltage,

REG1

1.75V Regulator Source Current,

REG1

1.75V Regulator Sink Current,

REG1

1.75V Regulator Source Current

Limit

1.75V Regulator Sink Current

Limit

DIFFSENSE OUTPUT

DIFFSENSE Driver Output

Voltage

DIFFSENSE Driver Source

Current

DIFFSENSE Driver Sink Current

DSO

DSH

DSL

-5mA

≤

DIFFSENSE

≤

50µA

DIFFSENSE

= 0V

DIFFSENSE

= 2.4V

1.2

-5

100

1.3

1.4

-15

200

µA

075

SRC_075

SINK_075

SRCL_075

SINKL_075

175

SRC_175

SINK_175

SRCL_175

SINKL_175

OUT

±125mA

OUT

= 0.25V

OUT

= 1.25V

OUT

= 0V

OUT

= 3.3V

OUT

±125mA

OUT

= 1.25V

OUT

= 2.25V

REF

= 0V

REF

= 3.3V

+200

-700

+700

1.7

1.75

+200

-700

+700

1.8

-200

0.7

0.75

0.8

-200

TERM

No load

2.7

5.25

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

_____________________________________________________________________

LVD SCSI 27-Line Regulator

ELECTRICAL CHARACTERISTICS

(continued)

(TERMPWR = 3.3V, T

= 0°C to +70°C, unless otherwise noted.) (Note 1)

PARAMETER

THERMAL SHUTDOWN

Thermal-Shutdown Threshold

(Note 2)

Thermal-Shutdown Hysteresis

(Note 2)

For increasing temperature

+150

°C

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

DS2129

Note 1:

All voltages are referenced to ground.

Note 2:

Guaranteed by design and not production tested.

Typical Operating Circuit

TERMPWR

2.7V TO 5.25V

TERMPWR

4.7µF

DIFFSENSE

DS2129

REG1

4.7µF

475Ω

R1N

121Ω

R1P

4.7µF

475Ω

R2N

REG2

R26P

R27N

475Ω

121Ω

R27P

475Ω

_____________________________________________________________________

LVD SCSI 27-Line Regulator

DS2129

Pin Description

1, 8, 9,

10, 15,

NAME

FUNCTION

Chip Information

TRANSISTOR COUNT: 3778 CMOS and 80 BIPOLAR

PROCESS: BiCMOS

SUBSTRATE CONNECTED TO GROUND

N.C.

No Connection. Do not connect pins.

Thermal Information

Thermal Resistance (junction-to-ambient):

= +77°C/W

Thermal Resistance (junction-to-case):

= +25°C/W

TERMPWR

Termination Power. Connect to SCSI

TERMPWR line and decouple with a

4.7µF ceramic capacitor.

Regulator 2, 0.75V Output. Decouple

with a 4.7µF ceramic capacitor.

Signal Ground

Heat-Sink Ground. Internally

connected to the mounting pad.

Should be connected to ground.

Regulator 1, 1.75V Output. Decouple

with a 4.7µF ceramic capacitor.

DIFFSENSE Output. Drives the SCSI

bus DIFFSENSE line.

5, 11–14

REG2

GND

HS_GND

REG1

DIFFSENSE

Detailed Description

The DS2129 provides three regulated outputs. The

REG1 provides a 1.75V output, and the REG2 provides

a 0.75V output. Both regulators can sink and source

200mA of current. These regulators are current-limited

to less than 700mA. The thermal-shutdown circuit dis-

ables the output buffers should the die temperature

exceed +150°C. With a pi network of resistors (475Ω,

121Ω, 475Ω) connected to these two outputs, the

DS2129 provides common-mode bias, differential bias,

and common impedance and differential impedance,

as required in a terminator specified in SPI-2 and SPI-3

standards for a SCSI system. The third regulator pro-

vides a 1.3V output for DIFFSENSE signaling.

_____________________________________________________________________

LVD SCSI 27-Line Regulator

Package Information

(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,

go to

www.maxim-ic.com/packages).

DS2129

INCHES

DIM

MAX

MIN

0.069

0.053

0.010

0.004

0.014

0.019

0.007

0.010

0.050 BSC

0.150

0.157

0.228

0.244

0.016

0.050

MILLIMETERS

MAX

MIN

1.35

1.75

0.10

0.25

0.35

0.49

0.19

0.25

1.27 BSC

3.80

4.00

5.80

6.20

0.40

1.27

VARIATIONS:

INCHES

MILLIMETERS

MIN

4.80

8.55

9.80

MAX

5.00

8.75

10.00

N MS012

TOP VIEW

DIM

MIN

0.189

0.337

0.386

MAX

0.197

0.344

0.394

0∞-8∞

FRONT VIEW

SIDE VIEW

PROPRIETARY INFORMATION

TITLE:

PACKAGE OUTLINE, .150" SOIC

APPROVAL

DOCUMENT CONTROL NO.

REV.

21-0041

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.

Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________

Printed USA

is a registered trademark of Maxim Integrated Products.

SOICN .EPS

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