GMT G261P1 Datasheet
Ver 3.1
Oct 03, 2001
TEL: 886-3-5788833
http://www.gmt.com.tw
1
G261
Global Mixed-mode Technology Inc.
Low Voltage Differential (LVD) SCSI 27 Line Regulator Set
Features
SCSI SPI-2 (Ultra 2) LVD SCSI 27 Line Low Voltage Differential Regulator
4.0V 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 (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).
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 16pin SOP.
Ordering Information
PART TEMP. RANGE PIN-PACKAGE
G261P1 -40°C~80°C 8 Pin SOP
Pin Configuration
REG2
HSPGND
HSPGND
REG1
2
3
4
8
7
6
5
8 Pin SOP
TERMPWR
HSGND
HSGND
DIFFSENSE
1
REG2
HSPGND
HSPGND
REG1
2
3
4
8
7
6
5
8 Pin SOP
TERMPWR
HSGND
HSGND
DIFFSENSE
1
Ver 3.1
Oct 03, 2001
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℃ to 70℃,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
μ
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/10µA SINK
1.75V±50mV
50mA SOURCE/SINK
TRMPWR
4.0V to 5.25V
PGND
0.75V±50mV
50mA SOURCE/SINK
1.3V±0.1V
DIFFSENSE
REG1
REG2
SOURCE/SINK REGULATOR
REF 1.75V
REF 0.75V
REF 1.3V
5mA SOURCE/10µA SINK
1.75V±50mV
50mA SOURCE/SINK
TRMPWR
4.0V to 5.25V
PGND
0.75V±50mV
50mA SOURCE/SINK
1.3V±0.1V
DIFFSENSE
REG1
REG2
SOURCE/SINK REGULATOR
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