G261P1U

Global Mixed-mode Technology Inc. Low Voltage Differential (LVD) SCSI 27 Line Regulator Set 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 G261 Description The G261 LVD Regulator set is designed to provide the correct reference voltages and bias currents for LVD termination resistor networks (475Ω, 121Ω, and 475Ω). The device also provides a 1.3V output for DIFFSENSE signaling. With the proper resistor network, 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 voltage 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. Applications SCSI cable SCSI card Disk Array Industrial PC POS Ordering Information ORDER ORDER NUMBER TEMP. NUMBER (Pb free) RANGE G261P1U G261P3U G261P1Uf G261P3Uf 0°C~70°C 0°C~70°C PACKAGE SOP-8 SOP-16 Pin Configuration G261 NC REG2 REG2 HSPGND HSPGND REG1 1 8 1 2 3 4 5 6 7 8 G261 16 15 14 13 12 11 10 9 NC NC NC HSGND HSGND NC NC NC TERMPWR HSGND HSGND DIFFSENSE TERMPWR REG2 HSPGND HSGND REG1 DIFFSENSE NC 2 7 3 6 4 5 SOP-8 SOP-16 Ver 3.2 Dec 13, 2004 TEL: 886-3-5788833 http://www.gmt.com.tw 1 Global Mixed-mode Technology Inc. Absolute Maximum Ratings TERMPWR…………….……….……………….……6V Package Dissipation………………………………..1W Junction Temperature…………..…….-55°C to 150°C Storage Temperature…………………-65°C to 150°C G261 Recommended Operating Conditions TERMPWR Voltage…….………………4.0V to 5.25V Electrical Characteristics Unless otherwise specified these specifications apply for TA= 0°C to 70°C, TERMPWR=5V. PARAMETER TERMPWR Supply Current Section TERMPWR Supply Current TERMPWR Voltage Regulator Section 1.75 Volt Regulator 1.3 Volt Regulator 0.75 Volt Regulator 1.75 Volt Regulator Source Current 1.75 Volt Regulator Sink Current 1.75 Sink Current Limit 1.75 Source Current Limit 1.3 Volt Regulator Source Current 1.3 Volt Regulator Sink Current 0.75 Volt Regulator Source Current 0.75 Volt Regulator Sink Current 0.75 Current Limit 0.75 Current Limit TEST CONDITIONS No Load MIN --4.0 1.7 1.2 0.7 -50 50 ---600 TYP 6 --1.75 1.3 0.75 --------------------- MAX 10.0 5.25 1.8 1.4 0.8 ----600 ---15 200 ----600 --- UMITS mA V V V V mA mA mA mA mA µA mA mA mA mA REG1(±50mA) DIFFSENSE, No Load REG2(±50mA) DIFFSENSE, GND DIFFSENSE, 2.4V -5 10 -50 50 -600 Block Diagram REF 1.3V TRMPWR 4.0V to 5.25V REF REF 1.75V 1.75V±50mV 50mA SOURCE/SINK 5mA SOURCE/10µA SINK 1.3V±0.1V DIFFSENSE REG1 SOURCE/SINK REGULATOR REF 0.75V 0.75V±50mV 50mA SOURCE/SINK REG2 PGND Ver 3.2 Dec 13, 2004 TEL: 886-3-5788833 http://www.gmt.com.tw 2 Global Mixed-mode Technology Inc. Application Information DIFFSENSE: SOURCE ONLY FROM TERMPWR REF REF 1.3V 1.3V ±0.1V SOURCE 5 to 15mA SOURCE/SINK REGULATOR REF 1.75V REG1 1.75V ±50mV 50 mA SOURCE/SINK 475 1% DIFFSENSE G261 TERMPWR 1µF to DIFFSENS pin L1- 4.7µF 121 1% REG2 SOURCE/SINK REGULATOR PGND REF 0.75V 0.75V ±50mV 50 mA SOURCE/SINK 475 1% 4.7µF L1+ 475 1% L27121 1% 475 1% L27+ Figure 1. LVD SCSI Discrete Resistor Stack Table1. Resistor Network v.s Standard OUTPUTS 107.3Ω Diff 112.9mV Diff Bias 237Ω Common Mode 1.25V Common Mode SPECIFICATION 100Ω to 110Ω 100mV to 125mV 100Ω to 300Ω 1.2V to 1.30V Application Note: The resistor network, along with the 1.75V and 0.75V references will give the correct differential impedance, bias voltage, common mode impedance and common mode voltage as show in Table 1. Layout guideline: 1. For stable operation, the 1µF capacitor on TERMPWR pin and 4.7µF capacitors on REG1 and REG2 pins must be placed within 0.25 inch of their respective pins. 2. The PCB trace length form Lx- and Lx+ to the connector pins (all 27pairs) must be of equal length, in order to minimize the signal skew among these pairs. In addition, these traces must be as short as possible, in order to minimize capacitance. Ver 3.2 Dec 13, 2004 TEL: 886-3-5788833 http://www.gmt.com.tw 3 Global Mixed-mode Technology Inc. Package Information C G261 E H L D θ 7 ° (4 X) A2 y B A1 A e SOP-8 Package 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. SYMBOL A A1 A2 B C D E e H L y θ MIN. 1.35 0.10 ----0.33 0.19 4.80 3.80 ----5.80 0.40 ----0º DIMENSION IN MM NOM. 1.60 ----1.45 ----------------1.27 ----------------- MAX. 1.75 0.25 ----0.51 0.25 5.00 4.00 ----6.20 1.27 0.10 8º MIN. 0.053 0.004 ----0.013 0.007 0.189 0.150 ----0.228 0.016 ----0º DIMENSION IN INCH NOM. 0.063 ----0.057 ----------------0.050 ----------------- MAX. 0.069 0.010 ----0.020 0.010 0.197 0.157 ----0.244 0.050 0.004 8º Ver 3.2 Dec 13, 2004 TEL: 886-3-5788833 http://www.gmt.com.tw 4 Global Mixed-mode Technology Inc. C G261 E H L D θ 7°(4X) A2 A1 A y B e SOP-16 Package 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 SYMBOL A A1 A2 B C D E e H L y θ MIN. 1.35 0.10 ----0.33 0.19 9.80 3.80 ----5.80 0.40 ----0º DIMENSION IN MM NOM. 1.60 ----1.45 ----------------1.27 ----------------- MAX. 1.75 0.25 ----0.51 0.25 10.00 4.00 ----6.20 1.27 0.10 8º MIN. 0.053 0.004 ----0.013 0.007 0.386 0.150 ----0.228 0.016 ----0º DIMENSION IN INCH NOM. 0.063 ----0.057 ----------------0.050 ----------------- MAX. 0.069 0.010 ----0.020 0.010 0.394 0.157 ----0.244 0.050 0.004 8º Taping Specification PACKAGE SOP-8 SOP-16 Feed F eed D irection T ypical S O P P ackage O rientation Q’TY/ REEL 2,500 ea 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. Ver 3.2 Dec 13, 2004 TEL: 886-3-5788833 http://www.gmt.com.tw 5