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