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ꢇ ꢆ ꢈꢉ ꢊꢋꢌ ꢍ ꢎꢏ ꢈ ꢂ ꢎꢏ ꢉ ꢏ ꢐ ꢑ ꢌꢒ ꢓꢊ ꢋ ꢔꢑꢕ ꢒ
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SLUS386B − FEBRUARY 2000 − REVISED APRIL 2001
PM PACKAGE
(TOP VIEW)
D
SCSI SPI-2, SPI-3, SPI-4,
Ultra160, Ultra320 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−
L25+
{DISCNCT1
{DISCNCT2
L21−
1
2
3
4
5
6
7
8
9
48
47
46
45
44
43
42
41
40
D
Less than 0.5-pF Capacitance
Differential Between Pairs
L26−
L26+
L21+
D
D
D
2.7 V to 5.25 V Operation
Differential Failsafe Bias
L27−
L20−
L27+
L20+
64-Pin Low Profile QFP
STRMPWR
PTRMPWR
REG
L19−
L19+
DIFSENS
SGND
39 DIFFB
38 L18−
37 L18+
10
PGND 11
LVD 12
36
35
34
33
L10− 13
L17−
L17+
L16−
L16+
14
15
16
L10+
L11−
L11+
171819 20 21 22 23 24 25 26 27 28 29 30 31 32
{For the UCC5647, Pin 47 is DISCNCT1 and Pin 48 is DISCNCT2.
description
The UCC5646 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 UCC5646 allows for minimal bus loading for a maximum number of
peripherals. With the UCC5646, the designer is able to comply with the Ultra2, Ultra3, Ultra160 and Ultra320
specifications. The UCC5646 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
UCC5646PM
UCC5647PM
0°C to 70°C
†
The PM package is available taped and reeled. Add TR suffix to
device type (e.g. UCC5646PMTR) 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.
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Copyright 2001, Texas Instruments Incorporated
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1
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