UCC5510

SLUS332A - OCTOBER 1999

FEATURES

• Auto Selection Multi-Mode Single

Ended or Low Voltage Differential

Termination

• 3.0V to 5.25V Operation

• Differential Failsafe Bias

• Thermal Packaging for Low Junction

Temperature and Better MTBF

• Master/Slave Inputs

• Supports Active Negation

• 3pF Channel Capacitance

Low Voltage Differential (LVD/SE) SCSI 9 Line Terminator

1

REG

DIFFSENS

5L1–

4L1+

32

L9–

31

L9+

125

+50mV TO +62.5mV

SWITCHES UP ARE SINGLE

ENDED SWITCHES DOWN ARE

LOW VOLTAGE DIFFERENTIAL

0.7 > 0.6V

2.2 > 1.9V

SE GND

SWITCH

52

110

52

125 +50mV TO +62.5mV

52

110

52

DEVICE MODE

SELECT LOGIC

21

DIFFB

REF 2.7V

REF 1.25V

19

MSTR/SLV

38

TRMPWR

REF 1.3V

1.3V ± –0.1V

20

SOURCE 5 < 15mA

SINK 200

µA MAXIMUM (NOISE LOAD)

8

HS/GND

28

27

26

10

9

18

HS/GND

HS/GND

HS/GND

HS/GND

HS/GND

GND

BLOCK DIAGRAM

UDG-98033

DESCRIPTION

The UCC5510 Multi-Mode Low Voltage Differential and Single Ended

Terminator is specially designed for automatic termination of Single-

Ended or Low Voltage Differential SCSI Bus. The Multi-Mode operation of

this device allows for a transition system design for the next generation

SCSI Parallel Interface (SPI-2). Compliant with SPI-2, with SPI and Fast-

20 the UCC5510 incorporates all the functions necessary to properly ter-

minate the SCSI Bus and has internal thermal shut down and short cir-

cuit limiting.

Circuit Design Patented