ꢀꢁꢁ ꢂ ꢃꢄ ꢃ ꢅ ꢀ ꢁꢁ ꢂꢃ ꢄꢆ
ꢇ ꢆ ꢈꢉꢊ ꢋ ꢌ ꢍ ꢎꢏ ꢈ ꢂ ꢎꢏ ꢉ ꢏ ꢐ ꢑ ꢌꢒꢓ ꢊꢋꢔꢑꢕ ꢒ ꢖ ꢕ ꢒ ꢗ ꢊꢐꢌ ꢀꢉꢑ ꢒꢔꢇ ꢅ ꢀ ꢉꢑꢒ ꢔ ꢍꢅ
ꢀꢉꢑꢒ ꢔꢘ ꢃ ꢙ ꢅ ꢔꢋꢐ ꢀꢉꢑ ꢒꢔꢍ ꢇ ꢙ ꢚꢁꢚ ꢊ ꢗ ꢊꢑ ꢛ ꢊꢋ ꢑꢌ ꢜ ꢒꢔꢑ ꢌꢐ ꢚꢝꢊ ꢎ ꢍ ꢐ ꢌꢉ ꢔꢞ
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SLUS459B – OCTOBER 2000 – REVISED APRIL 2001
PM PACKAGE
(TOP VIEW)
D
SCSI SPI-2, SPI-3, Ultra2, Ultra3, Ultra160,
Ultra320 SCSI Compliance
D
D
Smallest Footprint
Lowest Channel
Capacitance, 2 pF
64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49
L25–
{DISCNCT1
{DISCNCT2
L21–
1
2
3
4
5
6
7
8
9
48
47
46
45
44
43
42
41
40
39
D
Less than 0.5-pF Capacitance
Differential Between Pairs
L25+
L26–
L26+
L21+
D
D
D
2.7 V to 5.25 V Operation
Differential Failsafe Bias
L27–
L20–
L27+
L20+
Built–in SPI-3 Mode
Change/Filter Delay
STRMPWR
PTRMPWR
REG
L19–
L19+
D
64-Pin Low Profile QFP
DIFSENS
DIFFB
SGND
10
PGND 11
LVD 12
38 L18–
37 L18+
36
35
34
33
L10– 13
L17–
L17+
L16–
L16+
14
15
16
L10+
L11–
L11+
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
{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
†
PACKAGED DEVICES
DISCONNECT
STATUS
T
A
LOW PROFILE QFP
(PM)
REGULAR
REVERSE
UCC5686PM
UCC5687PM
0°C to 70°C
†
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.
Copyright 2000, Texas Instruments Incorporated
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1
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