DS2129 MAXIM | Alldatasheet

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Technical content

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 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

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* VOLTAGE (V) PIN- PACKAGE 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 BANDGAP (1.25V) THERMAL SHUTDOWNREF125 PTAT REF175 TS 1.75V REG2 REG1 DIFFSENSE1.3V REF075 0.75V REF130 REFERENCES TS TS TS TERMPWR GND 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.

LVD SCSI 27-Line Regulator 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 specificatio ns is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Continuous Power Dissipation (T A = +70°C) 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 5.25 V VREF REGULATOR 0.75V Regulator Output Voltage, REG2 V075 IOUT = ±125mA 0.7 0.75 0.8 V 0.75V Regulator Source Current, REG2 ISRC_075 VOUT = 0.25V -200 mA 0.75V Regulator Sink Current, REG2 ISINK_075 VOUT = 1.25V +200 mA 0.75V Regulator Source Current Limit ISRCL_075 VOUT = 0V -700 mA 0.75V Regulator Sink Current Limit ISINKL_075 VOUT = 3.3V +700 mA 1.75V Regulator Output Voltage, REG1 V175 IOUT = ±125mA 1.7 1.75 1.8 V 1.75V Regulator Source Current, REG1 ISRC_175 VOUT = 1.25V -200 mA 1.75V Regulator Sink Current, REG1 ISINK_175 VOUT = 2.25V +200 mA 1.75V Regulator Source Current Limit ISRCL_175 VREF = 0V -700 mA 1.75V Regulator Sink Current Limit ISINKL_175 VREF = 3.3V +700 mA DIFFSENSE OUTPUT DIFFSENSE Driver Output Voltage VDSO -5mA ≤ IDIFFSENSE ≤ 50µA 1.2 1.3 1.4 V DIFFSENSE Driver Source Current IDSH VDIFFSENSE = 0V -5 -15 mA DIFFSENSE Driver Sink Current IDSL VDIFFSENSE = 2.4V 100 200 µA

LVD SCSI 27-Line Regulator ELECTRICAL CHARACTERISTICS (continued) (TERMPWR = 3.3V, TA = 0°C to +70°C, unless otherwise noted.) (Note 1) Note 1: All voltages are referenced to ground. Note 2: Guaranteed by design and not production tested. PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS THERMAL SHUTDOWN Thermal-Shutdown Threshold (Note 2) For increasing temperature +150 °C Thermal-Shutdown Hysteresis (Note 2) 10 °C DS2129 475Ω 475Ω 475Ω 475Ω 121Ω 121Ω TERMPWR DIFFSENSE REG1 REG2 4.7μF 4.7μF 4.7μF TERMPWR 2.7V TO 5.25V R1N R1P R27N R27P DIFFSENSE R2N R26P Typical Operating Circuit

LVD SCSI 27-Line Regulator 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 (475 Ω, 121 Ω, 475 Ω) 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. Chip Information TRANSISTOR COUNT: 3778 CMOS and 80 BIPOLAR PROCESS: BiCMOS SUBSTRATE CONNECTED TO GROUND Thermal Information Thermal Resistance (junction-to-ambient): θJA = +77°C/W Thermal Resistance (junction-to-case): θJC = +25°C/W Pin Description PIN NAME FUNCTION 1, 8, 9, 10, 15, N.C. No Connection. Do not connect pins.

2 TERMPWR

Termination Power. Connect to SCSI TERMPWR line and decouple with a 4.7µF ceramic capacitor. 3 REG2 Regulator 2, 0.75V Output. Decouple with a 4.7µF ceramic capacitor.

4 GND Signal Ground

5, 11–14 HS_GND Heat-Sink Ground. Internally connected to the mounting pad. Should be connected to ground. 6 REG1 Regulator 1, 1.75V Output. Decouple with a 4.7µF ceramic capacitor. 7 DIFFSENSE DIFFSENSE Output. Drives the SCSI bus DIFFSENSE line.

LVD SCSI 27-Line Regulator Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circu it 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 _____________________ 5 © 2006 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc.

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). SOICN .EPS PACKAGE OUTLINE, .150" SOIC 21-0041 B REV.DOCUMENT CONTROL NO.APPROVAL PROPRIETARY INFORMATION TITLE: TOP VIEW FRONT VIEW MAX 0.010 0.069 0.019 0.157 0.010 INCHES 0.150 0.007 E C DIM 0.014 0.004 B MIN 0.053A 0.19 3.80 4.00 0.25 MILLIMETERS 0.10 0.35 1.35 MIN 0.49 0.25 MAX 1.75 0.0500.016L 0.40 1.27 0.3940.386D D MINDIM D INCHES MAX 9.80 10.00 MILLIMETERS MIN MAX 16 AC 0.337 0.344 AB 8.758.55 14 0.189 0.197 AA 5.004.80 8 N MS012 N SIDE VIEW H 0.2440.228 5.80 6.20 e 0.050 BSC 1.27 BSC C HE e B A1 A D 0∞-8∞ L VARIATIONS: