Texas Instruments UCC561TD, UCC561DPTR, UCC561DP Datasheet
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.
2
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