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Электронный компонент: G261

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Ver 3.2
Dec 13, 2004
TEL: 886-3-5788833
http://www.gmt.com.tw
1
G261
Global Mixed-mode Technology Inc.
Low Voltage Differential (LVD) SCSI 27 Line Regu-
lator 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
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
, 121, and
475
). 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
ORDER
NUMBER
ORDER NUMBER
(Pb free)
TEMP.
RANGE
PACKAGE
G261P1U
G261P1Uf
0
C~70C
SOP-8
G261P3U
G261P3Uf
0
C~70C
SOP-16


Pin Configuration


REG2
HSPGND
HSPGND
REG1
2
3
4
8
7
6
5
SOP-8
TERMPWR
HSGND
HSGND
DIFFSENSE
1
7
NC
TERMPWR
HSPGND
HSGND
REG1
DIFFSENSE
NC
NC
NC
NC
HSGND
HSGND
NC
NC
REG2
NC
SOP-16
1
16
2
3
4
5
8
15
14
13
12
11
10
9
6
G261
G261
REG2
HSPGND
HSPGND
REG1
2
3
4
8
7
6
5
SOP-8
TERMPWR
HSGND
HSGND
DIFFSENSE
1
7
NC
TERMPWR
HSPGND
HSGND
REG1
DIFFSENSE
NC
NC
NC
NC
HSGND
HSGND
NC
NC
REG2
NC
SOP-16
1
16
2
3
4
5
8
15
14
13
12
11
10
9
6
G261
G261

Ver 3.2
Dec 13, 2004
TEL: 886-3-5788833
http://www.gmt.com.tw
2
G261
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
Recommended Operating Conditions
TERMPWR Voltage.........................4.0V to 5.25V


Electrical Characteristics
Unless otherwise specified these specifications apply for TA= 0
C to 70C, 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
DIFFSENSE, 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
A
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

Block Diagram
REF 1.75V
REF 0.75V
REF 1.3V
5mA SOURCE/10A SINK
1.75V50mV
50mA SOURCE/SINK
TRMPWR
4.0V to 5.25V
PGND
0.75V50mV
50mA SOURCE/SINK
1.3V0.1V
DIFFSENSE
REG1
REG2
SOURCE/SINK REGULATOR
REF 1.75V
REF 0.75V
REF 1.3V
5mA SOURCE/10A SINK
1.75V50mV
50mA SOURCE/SINK
TRMPWR
4.0V to 5.25V
PGND
0.75V50mV
50mA SOURCE/SINK
1.3V0.1V
DIFFSENSE
REG1
REG2
SOURCE/SINK REGULATOR

Ver 3.2
Dec 13, 2004
TEL: 886-3-5788833
http://www.gmt.com.tw
3
G261
Global Mixed-mode Technology Inc.
Application Information

Figure 1. LVD SCSI Discrete Resistor Stack

Table1. Resistor Network v.s Standard
OUTPUTS SPECIFICATION
107.3
Diff
100
to 110
112.9mV Diff Bias
100mV to 125mV
237
Common Mode
100
to 300
1.25V Common Mode
1.2V to 1.30V

Application Note: The resistor network, along with the 1.75V and 0.75V references will give the correct dif-
ferential 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 or-
der to minimize the signal skew among these pairs. In addition, these traces must be as short as possible,
in order to minimize capacitance.
REF
1.3V
SOURCE/SINK REGULATOR
50 mA SOURCE/SINK
TERMPWR
50 mA SOURCE/SINK
DIFFSENSE
REG1
REG2
SOURCE 5 to 15mA
REF
1.75V
REF
0.75V
SOURCE/SINK REGULATOR
4.7F
4.7F
121 1%
121 1%
L1-
L1+
L27-
L27+
475 1%
475 1%
475 1%
PGND
475 1%
1.3V 0.1V
1.75V 50mV
0.75V 50mV
1F
DIFFSENSE: SOURCE ONLY
FROM TERMPWR
to DIFFSENS pin
REF
1.3V
SOURCE/SINK REGULATOR
50 mA SOURCE/SINK
TERMPWR
50 mA SOURCE/SINK
DIFFSENSE
REG1
REG2
SOURCE 5 to 15mA
REF
1.75V
REF
0.75V
SOURCE/SINK REGULATOR
4.7F
4.7F
121 1%
121 1%
L1-
L1+
L27-
L27+
475 1%
475 1%
475 1%
PGND
475 1%
1.3V 0.1V
1.75V 50mV
0.75V 50mV
1F
DIFFSENSE: SOURCE ONLY
FROM TERMPWR
to DIFFSENS pin

Ver 3.2
Dec 13, 2004
TEL: 886-3-5788833
http://www.gmt.com.tw
4
G261
Global Mixed-mode Technology Inc.
Package Information

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.
DIMENSION IN MM
DIMENSION IN INCH
SYMBOL
MIN. NOM. MAX. MIN. NOM. MAX.
A 1.35 1.60 1.75 0.053 0.063 0.069
A1 0.10 ----- 0.25 0.004 ----- 0.010
A2 ----- 1.45 ----- ----- 0.057 -----
B 0.33 ----- 0.51 0.013 ----- 0.020
C 0.19 ----- 0.25 0.007 ----- 0.010
D 4.80 ----- 5.00 0.189 ----- 0.197
E 3.80 ----- 4.00 0.150 ----- 0.157
e ----- 1.27 ----- ----- 0.050 -----
H 5.80 ----- 6.20 0.228 ----- 0.244
L 0.40 ----- 1.27 0.016 ----- 0.050
y ----- ----- 0.10 ----- ----- 0.004
0 ----- 8 0 ----- 8
D
E
H
7
(4X)
A1
A2
A
e
B
y
C
L
D
E
H
7
(4X)
A1
A2
A
e
B
y
C
L

Ver 3.2
Dec 13, 2004
TEL: 886-3-5788833
http://www.gmt.com.tw
5
G261
Global Mixed-mode Technology Inc.
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
DIMENSION IN MM
DIMENSION IN INCH
SYMBOL
MIN. NOM. MAX. MIN. NOM. MAX.
A 1.35 1.60 1.75 0.053 0.063 0.069
A1 0.10 ----- 0.25 0.004 ----- 0.010
A2 ----- 1.45 ----- ----- 0.057 -----
B 0.33 ----- 0.51 0.013 ----- 0.020
C 0.19 ----- 0.25 0.007 ----- 0.010
D 9.80 ----- 10.00 0.386 ----- 0.394
E 3.80 ----- 4.00 0.150 ----- 0.157
e ----- 1.27 ----- ----- 0.050 -----
H 5.80 ----- 6.20 0.228 ----- 0.244
L 0.40 ----- 1.27 0.016 ----- 0.050
y ----- ----- 0.10 ----- ----- 0.004
0 ----- 8 0 ----- 8

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 O rientation
Feed Direction
Typical SOP Package O rientation
C
L
e
A1
A2 A
B
7(4X)
y
E
H
D
C
L
e
A1
A2 A
B
7(4X)
y
E
H
D