UCC5638_06_技术文档

UCC5638

Multimode SCSI 15 Line Terminator

DESCRIPTION

FEATURES

The UCC5638 Multimode SCSI Terminator provides a smooth transition

into the LVD SCSI Parallel Interface (SPI-2, SPI-3, SPI-4). 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 UCC5638 can not be used

on a HVD, EIA485, differential SCSI bus. If the UCC5638 detects a HVD

SCSI device, it switches to a high impedance state.

• Auto Selection Single Ended (SE) or

Low Voltage Differential (LVD)

Termination

• Meets SCSI-1, SCSI-2, Ultra2 (SPI-2

LVD SCSI), Ultra3, Ultra160 (SPI-3)

and Ultra320 (SPI-4) Standards

• 2.7V to 5.25V Operation

• Differential Failsafe Bias

The Multimode terminator contains all functions required to terminate and

auto detect and switch modes for SPI-2, SPI-3 and SPI-4 bus architectures.

Single Ended and Differential impedances and currents are trimmed for

maximum effectiveness. Fail Safe biasing is provided to insure signal integ-

rity. 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 pro-

vides all the performance analog functions necessary to implement SPI-2

termination in a single monolithic device.

• Thermal packaging for low junction

temperature and better MTBF.

The UCC5638 is offered in a 48 pin LQFP package for a temperature range

of 0°C to 70°C.

BLOCK DIAGRAM

(NOISE LOAD)

HIGH POWER

2.15V

DIFFB 34

0.6V

DIFFERENTIAL

REF

1.3V

35 DIFFSEN

LOW VOLTAGE

DIFFERENTIAL

–15mA ≤ I

50µA ≤ I

≤ –5mA

SOURCE

≤ 200µA

SINGLE ENDED

SINK

110

124

REF

2.7V

SOURCE/SINK REGULATOR

56mV

52.5

–

+

REF

1.25V

12 L1–

11 L1+

56mV

+

–

MODE

SE

ALL SWITCHES

UP

LVD

DISCNCT

DOWN

OPEN

SE GND SWITCH

10µA

110

124

DISCNCT

TRMPWR

36

3

56mV

52.5

–

+

2

1

L15–

L15+

56mV

+

–

SE GND SWITCH

HS/GND

4-9

HS/GND

28-33

27

10

REG

GND

4.7µF .

UDG-98063

SLUS271B - FEBRUARY 2000 - REVISED APRIL 2001

UCC5638

ABSOLUTE MAXIMUM RATINGS

CONNECTION DIAGRAMS

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

Signal Line Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . 0V to 5V

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

(TOP VIEW)

FQP Package

HS/GND

REG

L1+

L1–

TRMPWR

L15–

L15+

Currents are positive into negative out of the specified terminal.

Note: Consult Packaging Section of Databook for thermal limi-

tations and considerations of package.

12

10

2

11

9

8

7

6

4

3

1

5

L2+

L2–

L3+

L3–

L4+

L4–

L5+

L5–

L6+

L6–

L7+

L7–

L14–

L14+

L13–

L13+

L12–

L12+

L11–

L11+

L10–

L10+

L9–

13

14

15

48

47

46

45

44

43

42

41

40

39

38

37

RECOMMENDED OPERATING CONDITIONS

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

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

16

17

18

19

20

21

22

23

24

L9+

25

27

35

26

28 29 30 31

33 34

36

32

DISCNCT

DIFFSENS

DIFFB

L8+

L8–

GND

HS/GND

ELECTRICAL CHARACTERISTICS Unless otherwise stated, these specifications apply for T_A= T_J= 0°C to 70°C,

TRMPWR = 3.3V.

PARAMETER

TRMPWR Supply Current Section

TRMPWR Supply Current

TEST CONDITIONS

MIN

TYP

MAX UNITS

LVD SCSI Mode

20

1.6

250

25

10

mA

A

SE SCSI Mode

Disabled Terminator

400

Regulator Section

1.25V Regulator

LVD SCSI Mode

V_REG= 0V

1.15

1.25

1.35

V

1.25V Regulator Source Current

1.25V Regulator Sink Current

1.3V Regulator

–375 –700 –1000 mA

V_REG= 3.3V

Diff Sense

170

1.2

–15

50

300

1.3

700

1.4

–5

mA

V

1.3V Regulator Source Current

1.3V Regulator Sink Current

2.7V Regulator

V_REG= 0V

mA

A

V_REG= 3.3V

SE SCSI Mode

V_REG= 0V

200

3.0

2.5

2.7

V

2.7V Regulator Source Current

2.7V Regulator Sink Curren

Differential Termination Section

Differential Impedance

Common Mode Impedence

Differential Bias Voltage

Common Mode Bias

–375 –700 –1000 mA

V_REG= 3.3V

170

300

700

mA

100

110

100

1.15

105

150

110

165

125

1.35

3

(Note 2)

mV

V

1.25

Output Capacitance

Single Ended Measurement to Ground (Note 1)

2

pF

UCC5638

ELECTRICAL CHARACTERISTICS Unless otherwise stated, these specifications apply for T_A= T_J= 0°C to 70°C,

TRMPWR = 3.3V.

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX UNITS

Single Ended Termination Section

Impedance

102.3

110

117.7

(VL_X−0.2V )

Z =

, (Note 3)

IL_X

Termination Current

Signal Level 0.2V, All Lines Low

Signal Level 0.5V

–21

–18

–24

–25.4

–22.4

400

3

mA

nA

Output Leakage

Output Capacitance

Single Ended Measurement to Ground (Note 1)

I = 10mA

pF

Single Ended GND SE Impedance

Disconnect and Diff Buffer Input Section

DISCNCT Threshold

20

10

60

0.8

2.0

30

V

A

V

A

DISCNCT Input Current

Diff Buffer Single Ended to LVD Threshold

Diff Buffer LVD to HPD Threshold

DIFFB Input Current

0.5

1.9

–10

0.7

2.4

10

Note 1: Ensured by design. Not 100% tested in production.

1.2V

_{(VCM max)}– I_{(VCM min)}

Note 2: Line+ (positive) tied to Line– (negative);

I

[

]

Note 3: VL_X= Output voltage for each terminator minus output pin (L1– through L15–) with each pin unloaded.

IL_X= Output current for each terminator minus output pin (L1– through L15–) with the minus output pin forced to 0.2V.

PIN DESCRIPTIONS

DIFFB: Diff sense filter pin should be connected at a LINEn–: Signal line active line for single ended or nega-

4.7 F capacitor.

tive line in differential applications for the SCSI bus.

DIFFSENS: The SCSI bus Diff Sense line to detect what

LINEn+: Ground line for single ended or positive line for

types of devices are connected to the SCSI bus.

differential applications for the SCSI bus.

DISCNCT: Disconnect pin shuts down the terminator REG: Regulator bypass pin, must be connected to a

when it is not at the end of the bus. The disconnect pin

low enables the terminator.

4.7 F capacitor.

TRMPWR: V_IN2.7V to 5.25V supply, bypass near the

terminator with a 4.7 F capacitor to ground.

Note: In Disconnect Mode, the comparitor set powers down for

low idle current.

3

UCC5638

APPLICATION INFORMATION

The UCC5638 is a Multi-mode active terminator with se- with 4 mil etch and 4 mil spacing between the runs within

lectable single ended (SE) and low voltage differential a pair, and a minimum of 8 mil spacing to the next pair.

(LVD) SCSI termination integrated into a monolithic com- This spacing between the pairs reduces potential

ponent. Mode selection is accomplished with the “diff crosstalk. Beware of feed-throughs and each through

sense" signal.

hole connection adds a lot of capacitance. Standard

power and ground plane spacing yields about 1pF to

each plane. Each feed-through will add about 2.5pF to

3.5pF. Enlarging the clearance holes on both power and

ground planes can reduce the capacitance and opening

up the power and ground planes under the connector

can reduce the capacitance for through hole connector

applications. Microstrip technology is normally too low of

impedance and should not be used. It is designed for

50 rather than 120 differential systems.

The diff sense signal is a three level signal, which is

driven at each end of the bus by one active terminator.

An LVD SCSI or multi-mode terminator drives the diff

sense line to 1.3 V. If diff sense is at 1.3 V, then bus is in

LVD SCSI mode. If a single ended SCSI device is

plugged into the bus, the diff sense line is shorted to

ground. With diff sense shorted to ground, the terminator

changes to single ended mode to accommodate the SE

device. If an HVD SCSI device is plugged in to the bus,

the diff sense line is pulled high and the terminator shuts

down.

Capacitance balance is critical for Ultra2 and

Ultra3/Ultra160. The balance capacitance standard is

0.5pF per line with the balance between pairs of 2pF.

The components are designed with very tight balance,

typically 0.1pF between pins in a pair and 0.3pF between

pairs. Layout balance is critical, feed-throughs and etch

length must be balanced, preferably no feed-throughs

would be used. Capacitance for devices should be meas-

ured in the typical application, material and components

above and below the circuit board effect the capacitance.

The diff sense line is driven and monitored by the termi-

nator through a 100ms to 300ms noise filter at the DIFFB

input pin. A set of comparators, that allow for ground

shifts, determine the bus status as follows. Any diff sense

signal below 0.5V indicates single ended, between 0.7V

and 1.9V is LVD SCSI and above 2.2V is HVD SCSI.

In the single ended mode, a multi-mode terminator has a

110 terminating resistor connected to a 2.7V termina-

tion voltage regulator. The 2.7V regulator is used on all

Unitrode terminators designed for 3.3V systems. This re-

quires the terminator to operate in specification down to

2.7V TRMPWR voltage to allow for the 3.3V supply toler-

ance, an unidirectional fusing device and cable drop. At

each L+ pin, a ground driver drives the pin to ground,

while in single ended mode. The ground driver is spe-

cially designed so it will not effect the capacitive balance

Multi-mode terminators need to consider power dissipa-

tion; the UCC5638 is offered in a power package with

heat sink ground pins. These heat sink/ground pins are

directly connected to the die mount paddle under the die

and conduct heat from the die to reduce the junction

temperature. These pins need to be connected to etch

area or a feed-through per pin connecting to the ground

plane layer on a multi-layer board.

of the bus when the device is in LVD SCSI or disconnect In 3.3V TRMPWR systems, the UCC3912 should be

mode. The device requirements call for 0.5pF balance on used to replace the fuse and diode. This reduces the

the lines of a differential pair. The terminator capacitance voltage drop, allowing for cable drop to the far end termi-

has to be a small part of the capacitance imbalance.

nator. 3.3V battery systems normally have a 10% toler-

ance. The UCC3912 is 150mV drop under LVD SCSI

loads, allowing 150mV drop in the cable system. All Uni-

trode LVD SCSI and multi-mode terminators are de-

signed for 3.3V systems, operating down to 2.7V.

Layout is very critical for Ultra2, Ultra3, Ultra160 and

Ultra320 systems. Multi-layer boards need to adhere to

the 120 impedance standard, including connector and

feed-through. This is normally done on the outer layers

4

UCC5638

TYPICAL APPLICATION

L1+

L1–

L1+

L1–

TERMPWR

TRMPWR

3

TRMPWR

3

CONTROL LINES (9)

L9+

L9–

L9+

L9–

L10+

L10–

L10+

L10–

4 BITS OF THE HIGH BYTE

L15+

L15–

L15+

L15–

36

DISCNCT

DIFFSENSE 35

35 DIFFSENSE

REG

10

DIFF B

34

DIFF B

34

REG

10

50k

4.7µF

.

4.7µF

270k

4.7µF

.

4.7µF

L1+

L1–

HIGH BYTE 4 BITS

PLUS PARITY

DATA LINES (15)

L5+

L5–

L5+

L5–

3

TRMPWR

3

L6+

L6–

L6+

L6–

LOW BYTE 8+ PARITY

L14+

L14–

L14+

L14–

36

DISCNCT

REG

10

DIFF B

34

DIFF B

34

REG

10

4.7µF

.

4.7µF

SCSI CONTROLLER

DIFFSENS

UDG-98064

Note: A 220k resistor is added to ground to insure the transceivers will come up in single-ended mode when no terminator is en-

abled. The controller DIFFSENS ties to the DIFFB pin on the terminators, only one RC network should be on a device.

5

PACKAGE OPTION ADDENDUM

www.ti.com

18-Jul-2006

PACKAGING INFORMATION

Orderable Device

UCC5638FQP

Status ⁽¹⁾

ACTIVE

Package Package

Pins Package Eco Plan ⁽²⁾Lead/Ball Finish MSL Peak Temp ⁽³⁾

Qty

Type

Drawing

LQFP

PT

48

250 Green (RoHS & CU NIPDAU Level-3-260C-168 HR

no Sb/Br)

UCC5638FQPG4

UCC5638FQPTR

UCC5638FQPTRG4

LQFP

PT

250 Green (RoHS & CU NIPDAU Level-3-260C-168 HR

no Sb/Br)

1000 Green (RoHS & CU NIPDAU Level-3-260C-168 HR

no Sb/Br)

1000 Green (RoHS & CU NIPDAU Level-3-260C-168 HR

no Sb/Br)

⁽¹⁾The marketing status values are defined as follows:

ACTIVE: Product device recommended for new designs.

LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.

NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in

a new design.

PREVIEW: Device has been announced but is not in production. Samples may or may not be available.

OBSOLETE: TI has discontinued the production of the device.

(2)

Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check

http://www.ti.com/productcontent for the latest availability information and additional product content details.

TBD: The Pb-Free/Green conversion plan has not been defined.

Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements

for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered

at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.

Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and

package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS

compatible) as defined above.

Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame

retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)

(3)

MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder

temperature.

Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is

provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the

accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take

reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on

incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited

information may not be available for release.

In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI

to Customer on an annual basis.

Addendum-Page 1

MECHANICAL DATA

MTQF003A – OCTOBER 1994 – REVISED DECEMBER 1996

PT (S-PQFP-G48)

PLASTIC QUAD FLATPACK

0,27

0,17

M

0,08

0,50

36

25

37

24

48

13

0,13 NOM

1

12

5,50 TYP

7,20

SQ

6,80

Gage Plane

9,20

SQ

8,80

0,25

0,05 MIN

0°–7°

1,45

1,35

0,75

0,45

Seating Plane

0,10

1,60 MAX

4040052/C 11/96

NOTES: A. All linear dimensions are in millimeters.

B. This drawing is subject to change without notice.

C. Falls within JEDEC MS-026

D. This may also be a thermally enhanced plastic package with leads conected to the die pads.

1

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型号：	UCC5638_06
厂家：	TEXAS INSTRUMENTS
描述：	Multimode SCSI 15 Line Terminator
文件：	总8页 (文件大小：127K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

UCC5638_06 [TI]

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