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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 (475, 121, and 475). 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 0C~70C 0C~70C
PACKAGE
SOP-8 SOP-16
Pin Configuration
G261
NC 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.....................-55C to 150C Storage Temperature.....................-65C to 150C
G261
Recommended Operating Conditions
TERMPWR Voltage.........................4.0V to 5.25V
Electrical Characteristics
Unless otherwise specified these specifications apply for TA= 0C to 70C, 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 A 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 1.75V 1.75V50mV 50mA SOURCE/SINK 5mA SOURCE/10A SINK
1.3V0.1V
DIFFSENSE
REG1
SOURCE/SINK REGULATOR REF 0.75V 0.75V50mV 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 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
1F
to DIFFSENS pin
L1-
4.7F 121 1% REG2
SOURCE/SINK REGULATOR PGND REF 0.75V 0.75V 50mV 50 mA SOURCE/SINK 475 1% 4.7F
L1+
475 1% L27121 1% 475 1% L27+
Figure 1. LVD SCSI Discrete Resistor Stack Table1. Resistor Network v.s Standard OUTPUTS 107.3 Diff 112.9mV Diff Bias 237 Common Mode 1.25V Common Mode SPECIFICATION 100 to 110 100mV to 125mV 100 to 300 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 1F capacitor on TERMPWR pin and 4.7F 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 7 (4X)
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
MIN.
1.35 0.10 ----0.33 0.19 4.80 3.80 ----5.80 0.40 ----0
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 8
MIN.
0.053 0.004 ----0.013 0.007 0.189 0.150 ----0.228 0.016 ----0
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 8
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
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
MIN.
1.35 0.10 ----0.33 0.19 9.80 3.80 ----5.80 0.40 ----0
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 8
MIN.
0.053 0.004 ----0.013 0.007 0.386 0.150 ----0.228 0.016 ----0
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 8
Taping Specification
PACKAGE
SOP-8 SOP-16
Feed 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

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