Texas Instruments UCC5639FQPTR, UCC5639FQP Datasheet

UCC5639

Multimode SCSI 15 Line Terminator with Reverse Disconnect

FEATURES

• Auto Selection Single Ended (SE) or
Low Voltage Differential (LVD)
Termination

• Meets SCSI-1, SCSI-2, SCSI-3, SPI,
Ultra (Fast-20), Ultra2 (SPI-2 LVD)
and Ultra3 Standards

• 2.7V to 5.25V Operation

• Differential Failsafe Bias

• Thermal packaging for low junction

temperature and better MTBF.

BLOCK DIAGRAM

2.05V

34DIFFB

0.6V

DESCRIPTION

The UCC5639 Multimode SCSI Terminator provides a smooth transition
into the next generation of the SCSI Parallel Interface (SPI-2). It automati­cally senses the bus, via DIFFB, and switches the termination to either sin­gle ended (SE) or low voltage differential (LVD) SCSI, dependent on which
type of devices are connected to the bus. The UCC5639 can not be used
on a HVD, EIA485, differential SCSI bus. If the UCC5639 detects a HVD
SCSI device, it switches to a high impedance state.

The Multimode terminator contains all functions required to terminate and
auto detect and switch modes for SPI-2 bus architectures. Single Ended
and Differential impedances and currents are trimmed for maximum effec­tiveness. Fail Safe biasing is provided to insure signal integrity. Device/Bus
type detection circuitry is integrated into the terminator to provide automatic
switching of termination between single ended and LVD SCSI and a high
impedance for HVD SCSI. The multimode function provides all the perform­ance analog functions necessary to implement SPI-2 termination in a sin­gle monolithic device.

The UCC5639 is offered in a 48 pin LQFP package for a temperature range
of 0°C to 70°C.

HIGH PO WER
DIFFERENTIAL

LOW VOLT AGE
DIFFERENTIAL

SINGLE ENDED

(NOISE LOAD)

REF

1.3V

–15mA ≤ I
50µA ≤ I

SOURCE

SINK

≤ –5mA

≤ 200µA

1.3V
35 DIFFSENS

DISCNCT

03/99

REF

2.7V

REF

1.25V

36

3TRMPWR

HS/GND

27

GND

4-9

SOURCE/SINK REGULATOR

MODE

DISCNCT

SE

LVD

HS/GND

ALL SWITCHES

UP

DOWN

OPEN

28-33

REG

10

4.7µF .

110

124

110

124

56mV

–+

56mV

+–

SE GND SWITCH

56mV

–+

56mV

+–

SE GND SWITCH

52.5

52.5

52.5

52.5

12

11

2

1

L1–

L1+

L15–

L15+

UDG-98110

UCC5639

ABSOLUTE MAXIMUM RATINGS

TRMPWR Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +6V

Signal Line Voltage . . . . . . . . . . . . . . . . . . . . . 0V to TRMPWR

Package Dissipation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2W

Storage Temperature . . . . . . . . . . . . . . . . . . . –65°C to +150°C

Junction Temperature. . . . . . . . . . . . . . . . . . . –55°C to +150°C

Lead Temperature (Soldering, 10 sec.). . . . . . . . . . . . . +300°C

Recommended Operating Conditions . . . . . . . . . 2.7V to 5.25V

Currents are positive into negative out of the specified terminal.
Note: Consult Packaging Section of Databook for thermal limi­tations and considerations of package.

RECOMMENDED OPERATING CONDITIONS

TRMPWR Voltage . . . . . . . . . . . . . . . . . . . . . . . . 2.7V to 5.25V

Temperature Ranges . . . . . . . . . . . . . . . . . . . . . . 0°C to +70°C

CONNECTION DIAGRAMS

(TOP VIEW)
FQP Package

HS/GND
HS/GND
HS/GND

REG

L1+
L1–

12

10

L8+

GND
HS/GND
HS/GND
HS/GND

L8–

L2+
L2–
L3+
L3–
L4+
L4–
L5+
L5–
L6+
L6–
L7+
L7–

11

13
14
15
16

17
18
19
20

21
22
23
24

25

26

8

7

9

27

29

30

28

6

5

313233

HS/GND
HS/GND
HS/GND

TRMPWR
L15–
L15+

2

4

3

1

L14–

48
47

L14+
L13–

46

L13+

45

L12–

44

L12+

43

L11–

42

L11+

41

L10–

40

L10+

39
38

L9–

37

35

34

L9+

36

DISCNCT
DIFSENS
DIFFB
HS/GND
HS/GND
HS/GND

ELECTRICAL CHARACTERISTICS

Unless otherwise stated, these specifications apply for TA= TJ= 0°C to 70°C,

TRMPWR = 3.3V.

PARAMETER TEST CONDITIONS MIN TYP MAX UNITS

TRMPWR Supply Current Section

TRMPWR Supply Current LVD Mode 20 25 mA

SE Mode 1.6 10 mA
Disabled Terminator 250 400

Regulator Section

1.25V Regulator LVD Mode 1.15 1.25 1.35 V

1.25V Regulator Source Current V

1.25V Regulator Sink Current V

= 0V –375 –700 –1000 mA

REG

= 3.3V 170 300 700 mA

REG

1.3V Regulator DIFSENS 1.2 1.3 1.4 V

1.3V Regulator Source Current V

1.3V Regulator Sink Current V

= 0V –15 –5 mA

REG

= 3.3V 50 200 µA

REG

2.7V Regulator SE Mode 2.5 2.7 3.0 V

2.7V Regulator Source Current V

2.7V Regulator Sink Curren V

= 0V –375 –700 –1000 mA

REG

= 3.3V 170 300 700 mA

REG

Differential Termination Section

Differential Impedance 100 105 110 Ω
Common Mode Impedence (Note 2) 110 150 165 Ω
Differential Bias Voltage 100 125 mV
Common Mode Bias 1.15 1.25 1.35 V
Output Capacitance Single Ended Measurement to Ground (Note 1) 3 pF

µA

2