GMT G261 Low voltage differential (lvd) scsi 27 line regulator set Datasheet

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
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