UCC5686, UCC5687

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

ULTRA160, AND ULTRA320 SCSI WITH INTEGRATED SPI3 DELAY

SLUS459B – OCTOBER 2000 – REVISED APRIL 2001

1

POST OFFICE BOX 655303

Ultra320 SCSI Compliance

Capacitance, 2 pF

Differential Between Pairs

Change/Filter Delay

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

DISCONNECT

STATUS

LOW PROFILE QFP

(PM)

0

°Cto70°C

REGULAR

UCC5686PM

0

°C to 70°C

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.

Copyright

 2000, Texas Instruments Incorporated

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.

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.

17 18 19

{DISCNCT1

{DISCNCT2

L21–

L21+

L20–

L20+

L19–

L19+

DIFSENS

DIFFB

L18–

L18+

L17–

L17+

L16–

L16+

48

47

46

45

44

43

42

41

40

39

38

37

36

35

34

33

20

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

L25–

L25+

L26–

L26+

L27–

L27+

STRMPWR

PTRMPWR

REG

SGND

PGND

LVD

L10–

L10+

L11–

L11+

21 22 23 24

63 62 61 60 59

64

58

56 55 54

57

25 26 27 28 29

53 52 51 50 49

30 31 32

{For the UCC5687, Pin 47 is DISCNCT1 and Pin 48 is DISCNCT2.

PM PACKAGE

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