TEXAS INSTRUMENTS UCC5686, UCC5687 Technical data

!

UCC5686, UCC5687

27-LINE 3 V - 5 V LVD TERMINATOR FOR WIDE ULTRA2, ULTRA3,

ULTRA160, AND ULTRA320 SCSI WITH INTEGRATED SPI 3 DELAY

SLUS459B – OCTOBER 2000 – REVISED APRIL 2001

D SCSI SPI-2, SPI-3, Ultra2, Ultra3, Ultra160,

PM PACKAGE

Ultra320 SCSI Compliance

L24+

L24– L23+

(TOP VIEW)

L5+ L5– L22+

L22–

D

Smallest Footprint

L23– L9+ L9– L8+ L8– L7+ L7– L6+ L6–

D

Lowest Channel

Capacitance, 2 pF

L25–

64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49

{DISCNCT1

D

Less than 0.5-pF Capacitance

1

48

L25+

2

47

{DISCNCT2

Differential Between Pairs

L26–

3

46

L21–

D

2.7 V to 5.25 V Operation

L26+

4

45

L21+

D

Differential Failsafe Bias

L27–

5

44

L20–

D

Built–in SPI-3 Mode

L27+

6

43

L20+

Change/Filter Delay

STRMPWR

7

42

L19–

D

64-Pin Low Profile QFP

PTRMPWR

8

41

L19+

REG

9

40

DIFSENS

SGND

10

39

DIFFB

PGND

11

38

L18–

LVD

12

37

L18+

L10–

13

36

L17–

L10+

14

35

L17+

L11–

15

34

L16–

L11+

16

33

L16+

17 18 19

20 21 22 23 24 25 26 27 28

29 30 31

32

L12+

L12– L13+

L13– L1+ L1– L2+ L2– L3+ L3– L4+ L4–

L14+ L14– L15+

L15–

{For the UCC5687, Pin 47 is

DISCNCT1

and Pin 48 is

DISCNCT2.

description

The UCC5686 is a twenty-seven line active terminator for low-voltage-differential (LVD) SCSI networks. This LVD SCSI-only design allows the user to reach peak bus performance, while reducing system cost. The device is designed as an active Y-terminator to improve the frequency response of the LVD SCSI Bus. Designed with a 2-pF (typical) channel capacitance, the UCC5686 allows for minimal bus loading for a maximum number of peripherals. With the UCC5686, the designer is able to comply with the Ultra2, Ultra3, Ultra160, and Ultra320 SCSI specifications. The UCC5686 also provides a much-needed system migration path for the ever improving SCSI system standards.

This device is available in the 64-pin low-profile QFP package for ease of layout use.

Single-ended (SE) and high-voltage differential (HVD) SCSI drivers are not supported.

AVAILABLE OPTIONS

		DISCONNECT	PACKAGED DEVICES†
	TA	STATUS	LOW PROFILE QFP
			(PM)
	0° C to 70° C	REGULAR	UCC5686PM
		REVERSE	UCC5687PM

†The PM package is available taped and reeled. Add TR suffix to device type (e.g. UCC5686PMTR) to order quantities of 1000 devices per reel.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.

Copyright 2000, Texas Instruments Incorporated

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

1

UCC5686, UCC5687

!

27-LINE 3 V - 5 V LVD TERMINATOR FOR WIDE ULTRA2, ULTRA3,

ULTRA160, AND ULTRA320 SCSI WITH INTEGRATED SPI 3 DELAY

SLUS459B – OCTOBER 2000 – REVISED APRIL 2001

block diagram

DIFSENS

40

–15mA

≤ I

SOURCE

≤

–5mA

*FOR THE UCC5687 PIN 47 IS DISCNCT1 AND PIN 48 IS DISCNCT2.

50 A ≤ ISINK ≤

200 A

REF 1.3V

1.3V +/– 0.1V

2.15 V

+

HPD

DIFFB

39

100 ms TO

300 ms

12

LVD

DELAY/

+

FILTER

STRMPWR

7

0.6V

SE

PTRMPWR

8

REF

125

52

1.25V

–

+

22

L1–

+56mV

SOURCE/SINK

52

*DISCNCT1

48

L10

L27

REGULATOR

+

–

21

L1+

+56mV

MODE

ALL SWITCHES

125

52

SE

OPEN

–

+

5

L27–

LVD

DOWN

+56mV

HVD

OPEN

52

L9 DISCNCT

OPEN

*DISCNCT2

47

L1

+

–

6

L27+

+56mV

10

11

9

SGND

PGND

REG

UDG-00123

absolute maximum ratings over operating free-air temperature range (unless otherwise noted)†‡

Input voltage VIN (STRMPWR, PTRMPWR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . . . . 6 V
Signal line input voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . 0 V to 5	V
Regulator output current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . 0.75	A
Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	–55° C to 150° C
Operating virtual junction temperature range, TJ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	–55° C to 150° C
Lead temperature (soldering, 10 seconds) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . 300° C

†Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

‡Unless otherwise indicated, voltages are reference to ground and currents are positive into and negative out of the specified terminals. Consult Packaging Section of the Interface Products Data Book (TI Literature Number SLUD002) for thermal limitations and considerations of packages.

All voltages are referenced to GND.

2	POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

!	UCC5686, UCC5687
	27-LINE 3 V - 5 V LVD TERMINATOR FOR WIDE ULTRA2, ULTRA3,
	ULTRA160, AND ULTRA320 SCSI WITH INTEGRATED SPI 3 DELAY
	SLUS459B – OCTOBER 2000 – REVISED APRIL 2001

electrical characteristics over recommended operating free-air temperature range, xTRMPWR = 2.7 V to 5.25 V, TA = 0_C to 70_C, DISCNCT1 = DISCNCT2 = 0 V for UCC5686,

DISCNCT1 = DISCNCT2 = open for UCC5687, TA = TJ. (unless otherwise noted)

PARAMETER		TEST CONDITIONS		MIN	TYP	MAX	UNIT
xTRMPWR Supply Current Section
xTRMPWR supply current		LVD mode				65	mA
		Disabled terminator				500	µ A
1.25 V Regulator Section
1.25 V regulator		0.5 V ≤ VCM ≤ 2.0 V,	See Note 1	1.15	1.25	1.35	V
Regulator source current		VREG = 0 V			–300	–240	mA
Regulator sink current		VREG = 3.0 V		240	300		mA
1.3 V (DIFSENS) Regulator Section
1.3 V regulator		–5mA ≤ IDIFSENS ≤ 50 µ A		1.2	1.3	1.4	V
Short-circuit source current		VDIFSENS = 0 V		–5	–8	–15	mA
Short-circuit sinkcurrent		VDIFSENS = 2.75 V		50		200	µ A
Differential Termination Section (Applies to each line pair 1–27)
Differential bias voltage				100		125	mV
Differential impedance				100	105	110	Ω
Common-mode bias voltage		L+ and L– shorted together		1.15	1.25	1.35	V
Common-mode impedance		L+ and L– shorted together,	See Note 2	110	140	165	Ω
Disconnected Termination Section
Output leakage current					10	400	nA
Output capacitance		SE measurement to GND,	See Note 3			3	pF
Disconnect Control (DISCNCT1) or (DISNCNT2) and DIFFB Input Section
DISCNCT threshold voltage				0.8	1.3	2.0	V
DISCNCT input current		VDISCNCT = 0 V and 2.0 V		–30		–10	µ A
DIFFB SE to LVD threshold voltage				0.5		0.7	V
DIFFB LVD to HPD threshold voltage				1.9		2.4	V
DIFFB Input current		0 V ≤ VDIFFB ≤ 2.75 V		–10		10	µ A
Low-Voltage Differential (LVD) Status Bit Section
Source current		VLOAD = 2.4 V			–6	–4	mA
Sink current		VLOAD = 0.4 V		2	5		mA
Time Delay/Filter Section
Mode change delay		(See Note 4)		100	190	300	ms
Thermal Shutdown Section
Thermal shutdown threshold		For increasing temperature		140	155	170	_C
Thermal shutdown hysteresis					10		_C

NOTES: 1. VCM is applied to all L+ and L– lines simultaneously.

2.0V * 0.5 V

2.ZCM + IVCM (max) * IVCM (max) , VCM(max) = 2.0 V, VCM(min) = 0.5 V

3.Ensured by design, not production tested.

4.A new mode change can begin any time after a previous mode change has been detected.

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

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