G261 GMT | Alldatasheet

Document overview

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Technical content

Features

„ SCSI SPI-2 (Ultra 2), SPI-3 (Ultra 3/Ultra 160) and SPI-4 (Ultra 320) LVD SCSI, 27 Line Low Voltage Differential Regulator „ 4V to 5.25V Operation „ Integrated Regulator Set for LVD SCSI „ Differential Failsafe Bias

Applications

„ SCSI cable „ SCSI card „ Disk Array „ Industrial PC „ POS

Description

The G261 LVD Regulator set is designed to provide the correct reference voltages and bias currents for LVD termination resistor networks (475 Ω, 121 Ω, and 475Ω). The device also provides a 1.3V output for DIFFSENSE signaling. With the proper resistor net- work, the G261 solution will meet the common mode impedance, differential mode impedance, differential bias voltage and common mode voltage requirements of SPI-2 (Ultra2), SPI-3 (Ultra 3/Ultra 160) and SPI-4 (Ultra 320). This device contains two sink / source reference volt- age regulators, a 1.3V buffered output and protection features. The protection features include thermal shutdown and active current limiting circuitry. The G261 is offered in 8 pin SOP and 16pin SOP.

Ordering Information

(Pb free) TEMP. RANGE PACKAGE G261P1U G261P1Uf 0°C~70°C SOP-8 G261P3U G261P3Uf 0°C~70°C SOP-16 Pin Configuration REG2 HSPGND HSPGND REG1 SOP-8 TERMPWR HSGND HSGND DIFFSENSE NC TERMPWR HSPGND HSGND REG1 DIFFSENSE NC NC NC NC HSGND HSGND NC NC REG2 NC SOP-16 1 16 G261 G261 REG2 HSPGND HSPGND REG1 SOP-8 TERMPWR HSGND HSGND DIFFSENSE NC TERMPWR HSPGND HSGND REG1 DIFFSENSE NC NC NC NC HSGND HSGND NC NC REG2 NC SOP-16 1 16 G261 G261

Ver 3.2 Dec 13, 2004 TEL: 886-3-5788833 http://www.gmt.com.tw G261Global Mixed-mode Technology Inc. Absolute Maximum Ratings Junction Temperature…………..…….-55 °C to 150°C Storage Temperature…………………-65 °C to 150°C Recommended Operating Conditions

Electrical Characteristics

Unless otherwise specified these specifications apply for TA= 0°C to 70°C, TERMPWR=5V. PARAMETER TEST CONDITIONS MIN TYP MAX UMITS TERMPWR Supply Current Section TERMPWR Supply Current No Load --- 6 10.0 mA TERMPWR Voltage 4.0 --- 5.25 V Regulator Section 1.75 Volt Regulator REG1(±50mA) 1.7 1.75 1.8 V 1.3 Volt Regulator DIFFSEN SE, No Load 1.2 1.3 1.4 V 0.75 Volt Regulator REG2(±50mA) 0.7 0.75 0.8 V

1.75 Volt Regulator Source Current -50 --- --- mA

1.75 Volt Regulator Sink Current 50 --- --- mA

1.75 Sink Current Limit --- --- 600 mA

1.75 Source Current Limit -600 --- --- mA

1.3 Volt Regulator Source Current DIFFSENSE, GND -5 --- -15 mA

1.3 Volt Regulator Sink Current DIFFSENSE, 2.4V 10 --- 200 µA

0.75 Volt Regulator Source Current -50 --- --- mA

0.75 Volt Regulator Sink Current 50 --- --- mA

0.75 Current Limit --- 600 mA

0.75 Current Limit -600 --- --- mA

REF 1.75V REF 0.75V REF 1.3V 5mA SOURCE/10µA SINK 1.75V±50mV 50mA SOURCE/SINK TRMPWR 4.0V to 5.25V PGND 0.75V±50mV 50mA SOURCE/SINK 1.3V±0.1V DIFFSENSE REG1 REG2 SOURCE/SINK REGULATOR REF 1.75V REF 0.75V REF 1.3V 5mA SOURCE/10µA SINK 1.75V±50mV 50mA SOURCE/SINK TRMPWR 4.0V to 5.25V PGND 0.75V±50mV 50mA SOURCE/SINK 1.3V±0.1V DIFFSENSE REG1 REG2 SOURCE/SINK REGULATOR

Ver 3.2 Dec 13, 2004 TEL: 886-3-5788833 http://www.gmt.com.tw G261Global Mixed-mode Technology Inc.

Application Information

Figure 1. LVD SCSI Discrete Resistor Stack

  1. For stable operation, the 1µF capacitor on TE RMPWR pin and 4.7µF capacitors on REG1 and REG2

pins must be placed within 0.25 inch of their respective pins.

  1. The PCB trace length form Lx- and Lx+ to the connec tor pins (all 27pairs) must be of equal length, in or-

in order to minimize capacitance.

Ver 3.2 Dec 13, 2004 TEL: 886-3-5788833 http://www.gmt.com.tw G261Global Mixed-mode Technology Inc.

Package Information

Note: 1.Package body sizes exclude mold flash and gate burrs 2.Dimension L is measured in gage plane 3.Tolerance 0.10mm unless otherwise specified 4.Controlling dimension is millimeter converted inch dimensions are not necessarily exact. DIMENSION IN MM DIMENSION IN INCH D E H 7 ° (4X) A2 A e B y C L θ D E H 7 ° (4X) A2 A e B y C L θ

Ver 3.2 Dec 13, 2004 TEL: 886-3-5788833 http://www.gmt.com.tw G261Global Mixed-mode Technology Inc. Note: 1.Package body sizes exclude mold flash and gate burrs 2.Dimension L is measured in gage plane 3.Tolerance 0.10mm unless otherwise specified 4.Controlling dimension is millimeter converted inch dimensions are not necessarily exact. 5.Followed from JEDEC MS-012 DIMENSION IN MM DIMENSION IN INCH Taping Specification PACKAGE Q’TY/ REEL SOP-8 2,500 ea SOP-16 2,500 ea GMT Inc. does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and GMT Inc. reserves the right at any time without notice to change said circuitry and specifications. Feed Direction Typical SOP Package Orientation Feed Direction Typical SOP Package Orientation C L θ e A2 A B 7°(4X) y E H D C L θ e A2 A B 7°(4X) y E H D