G261 Global Mixed-mode Technology Inc. Low Voltage Differential (LVD) SCSI 27 Line Regulator Set Features Description 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 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). Applications SCSI cable SCSI card Disk Array Industrial PC POS 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. 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 G261 REG2 1 8 TERMPWR HSPGND 2 7 HSGND HSPGND REG1 6 3 5 4 HSGND DIFFSENSE SOP-8 NC 1 16 NC TERMPWR 2 15 NC REG2 3 14 NC HSPGND 4 13 HSGND HSGND 5 12 HSGND REG1 6 11 NC DIFFSENSE 7 10 NC NC 8 9 NC SOP-16 TEL: 886-3-5788833 http://www.gmt.com.tw Ver 3.2 Dec 13, 2004 1 G261 Global Mixed-mode Technology Inc. Absolute Maximum Ratings Recommended Operating Conditions TERMPWR…………….……….……………….……6V Package Dissipation………………………………..1W Junction Temperature…………..…….-55°C to 150°C Storage Temperature…………………-65°C to 150°C 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 TEST CONDITIONS MIN TYP MAX UMITS --4.0 6 --- 10.0 5.25 mA V TERMPWR Supply Current Section TERMPWR Supply Current TERMPWR Voltage Regulator Section No Load 1.75 Volt Regulator REG1(±50mA) 1.7 1.75 1.8 V 1.3 Volt Regulator 0.75 Volt Regulator 1.75 Volt Regulator Source Current 1.75 Volt Regulator Sink Current DIFFSENSE, No Load REG2(±50mA) 1.2 0.7 -50 50 1.3 0.75 ----- 1.4 0.8 ----- V V mA mA ---600 ----- 600 --- mA mA 1.75 Sink Current Limit 1.75 Source Current Limit 1.3 Volt Regulator Source Current DIFFSENSE, GND -5 --- -15 mA 1.3 Volt Regulator Sink Current 0.75 Volt Regulator Source Current DIFFSENSE, 2.4V 10 -50 ----- 200 --- µA mA 50 ----- --600 mA mA -600 --- --- mA 0.75 Volt Regulator Sink Current 0.75 Current Limit 0.75 Current Limit Block Diagram REF 1.3V 1.3V±0.1V DIFFSENSE 5mA SOURCE/10µA SINK TRMPWR 4.0V to 5.25V REF 1.75V REG1 1.75V±50mV 50mA SOURCE/SINK SOURCE/SINK REGULATOR REG2 REF 0.75V 0.75V±50mV 50mA SOURCE/SINK PGND TEL: 886-3-5788833 http://www.gmt.com.tw Ver 3.2 Dec 13, 2004 2 G261 Global Mixed-mode Technology Inc. Application Information TERMPWR DIFFSENSE: SOURCE ONLY FROM TERMPWR REF 1.3V 1µF DIFFSENSE to DIFFSENS pin 1.3V ±0.1V SOURCE 5 to 15mA SOURCE/SINK REGULATOR REF 1.75V 475 1% REG1 1.75V ±50mV 50 mA SOURCE/SINK 4.7µF 121 1% SOURCE/SINK REGULATOR PGND REF 0.75V REG2 0.75V ±50mV 50 mA SOURCE/SINK L1- 475 1% L1+ 4.7µF 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. TEL: 886-3-5788833 http://www.gmt.com.tw Ver 3.2 Dec 13, 2004 3 G261 Global Mixed-mode Technology Inc. Package Information C E H L D θ 7 ° (4X) A2 y A A1 e B 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. MIN. DIMENSION IN MM NOM. MAX. MIN. DIMENSION IN INCH NOM. MAX. A A1 A2 B C 1.35 0.10 ----0.33 0.19 1.60 ----1.45 --------- 1.75 0.25 ----0.51 0.25 0.053 0.004 ----0.013 0.007 0.063 ----0.057 --------- 0.069 0.010 ----0.020 0.010 D E 4.80 3.80 --------- 5.00 4.00 0.189 0.150 --------- 0.197 0.157 e H L y θ ----5.80 0.40 ----- 1.27 ------------- ----6.20 1.27 0.10 ----0.228 0.016 ----- 0.050 ------------- ----0.244 0.050 0.004 0º ----- 8º 0º ----- 8º SYMBOL TEL: 886-3-5788833 http://www.gmt.com.tw Ver 3.2 Dec 13, 2004 4 G261 Global Mixed-mode Technology Inc. C E H L D θ 7°(4X) A2 e y A A1 B 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 MIN. DIMENSION IN MM NOM. MAX. MIN. DIMENSION IN INCH NOM. A A1 1.35 0.10 1.60 ----- 1.75 0.25 0.053 0.004 0.063 ----- 0.069 0.010 A2 B ----0.33 1.45 ----- ----0.51 ----0.013 0.057 ----- ----0.020 C D E e H L 0.19 9.80 3.80 ----5.80 0.40 ------------1.27 --------- 0.25 10.00 4.00 ----6.20 1.27 0.007 0.386 0.150 ----0.228 0.016 ------------0.050 --------- 0.010 0.394 0.157 ----0.244 0.050 y θ ----- ----- 0.10 ----- ----- 0.004 0º ----- 8º 0º ----- 8º SYMBOL MAX. Taping Specification PACKAGE Q’TY/ REEL SOP-8 SOP-16 2,500 ea 2,500 ea Feed D irection T ypical S O P P ackage O rientation 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. TEL: 886-3-5788833 http://www.gmt.com.tw Ver 3.2 Dec 13, 2004 5