Datasheet UCC561TD, UCC561DPTR, UCC561DP Datasheet (Texas Instruments)

Low Voltage Differential SCSI (LVD) 27 Line Regulator Set
UCC561
FEATURES
SCSI SPI-2 LVD SCSI 27 Line Low Voltage Differential Regulator
2.7V to 5.25V Operation
Integrated Regulator Set for LVD
SCSI
Differential Failsafe Bias
DESCRIPTION
The UCC561 LVD Regulator set is designed to provide the correct refer­ences voltages and bias currents for LVD termination resistor networks
, 121 and 475 ). The device also provides a 1.3V output for Diff
(475 Sense signaling. With the proper resistor network, the UCC561 solution will meet the common mode bias impedance, differential bias, and termination impedance requirements of SPI-2 (Ultra2) and SPI-3 (Ultra3).
This device incorporates into a single monolith, two sink/source reference voltage regulators, a 1.3V buffered output and protection features. The pro­tection features include thermal shut down and active current limiting cir­cuitry. The UCC561 is offered in 16-pin SOIC(DP) package.
BLOCK DIAGRAM
TRMPWR
2.7V < 5.25V
REF 1.3V
2
REF 1.75V
1.75V +/–50mV 200mA SOURCE/SINK
SOURCE/SINK REGULATOR
REF 0.75V
0.75V +/–50mV 200mA SOURCE/SINK
4
PGND
1.3V +/– 0.1V
7
3
DIFSENS
REG16
REG2
UDG-98093
SLUS413 - MAY 1999
UCC561
ABSOLUTE MAXIMUM RATINGS
TERMPWR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +6V
Package Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2W
Junction Temperature. . . . . . . . . . . . . . . . . . . –55°C to +150°C
Storage Temperature . . . . . . . . . . . . . . . . . . . –65°C to +150°C
Currents are positive into, negative out of the specified termi­nal. Consult Packaging Section of Databook for thermal limita­tions and considerations of packages.
RECOMMENDED OPERATING CONDITIONS
TERMPWR Voltage . . . . . . . . . . . . . . . . . . . . . . . 2.7V to 5.25V
CONNECTION DIAGRAMS
SOIC-16 (TOP VIEW) DP Packages
N/C
1
N/C
2
3
4
5
6
7
8
TERMPWR
REG2
HSPGND
HSGND
REG1
DIFSENS
16
15
14
13
12
11
10
9
N/C
N/C
N/C
HSGND
HSGND
N/C
N/C
N/C
ELECTRICAL CHARACTERISTICS:
Unless otherwise specified these specifications apply for TA = 0°C to 70°C,
TERMPWR = 3.3V.
PARAMETER TEST CONDITIONS MIN TYP MAX UNITS
TERMPWR Supply Current Section
TERMPWR Supply Current No Load 40.0 mA TERMPWR Voltage 2.7 5.25 V
Regulator Section
1.75 Volt Regulator REG1 (± 125mA) 1.7 1.75 1.8 V
1.3 Volt Regulator DIFSENS , No Load 1.2 1.3 1.4 V
0.75 Volt Regulator REG2 (± 125mA) 0.7 0.75 0.8 V
1.75 Volt Regulator Source Current V
= 1.25 –200 mA
O
1.75 Volt Regulator Sink Current VO= 2.25 200 mA
1.75 Volt Sink Current Limit 700 mA
1.75 Volt Source Current Limit –700 mA
1.3 Volt Regulator Source Current DIFSENS, GND –5 –15 mA
1.3 Volt Regulator Sink Current DIFSENS, 2.4V 50 200 µA
0.75 Volt Regulator Source Current VO= 0.25 –200 mA
0.75 Volt Regulator Sink Current VO= 1.25 200 mA
0.75 Source Current Limit 700 mA
0.75 Sink Current Limit –700 mA
Note 1: Guaranted by design. Not 100% tested in production.
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APPLICATION INFORMATION
TERMPWR
2.7V TO5.25V 2 TERMPWR
4.7µF DIFSENS: SOURCE ONLY
FROM TERMPWR
4PGND
REF
1.3V
SOURCE/SINK REGULATOR
REF
1.75V 200mA SOURCE/SINK
SOURCE/SINK REGULATOR
REF
0.75V 200mA SOURCE/SINK
1.3V ±0.1V
1.75V ±–50mV
0.75V ±–50mV
7
6
3
DIFSENS
REG1
4.7µF
REG2
UCC561
DIFSENS
475 1%
L1–
121 1%
475 1%
L1+
4.7µF
Figure 1. LVD SCSI discrete resistor stack.
Table I. Resistor stack vs. standard.
Outputs Specification
107.3
112.9mV Diff Bias 100mV to 125mV 237
1.25V Common Mode 1.2V to 1.30V
Application Note: The resistor stack with the 1.75V and 0.75V reference will give the correct differential impedance, bias volt­age, common mode differential impedance and common mode voltage as show in Table 1.
Diff 100 to 110
Common Mode 100 to 300
475 1%
475 1%
L27–
121 1%
L27+
UDG-98096
UNITRODE CORPORATION 7 CONTINENTALBLVD. • MERRIMACK, NH 03054 TEL. (603) 424-2410 • FAX (603) 424-3460
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Copyright 1999, Texas Instruments Incorporated
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