LX5255
TM
®
9-Line LVD SCSI Terminator
P
RODUCTION
DATA SHEET
DESCRIPTION
KEY FEATURES
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Microsemi
.C
OM
The LX5255 is a Low Voltage
Differential
(LVD)
terminator
designed to comply with the LVD
termination specification in the SPI-4
document. The LX5255 is specifically
designed for LVD only applications.
Because the LX5255 supports only
LVD, it has lower output capacitance
than multimode terminators such as
the LX5250.
The LX5255 utilizes an industry
standard LVD architecture. The
individual high bandwidth drivers
maximize channel separation, reduce
channel-to-channel noise and cross
talk to insure Ultra320 performance.
When the LX5255 is enabled, the
Differential Sense (DIFSENS) pin
supplies a voltage between 1.2V and
1.4V. In application, the terminator
DIFFB input is connected to the system
DIFSENS line. If there are no single
ended or High Voltage Differential
(HVD) devices attached to the system,
the LVD output will be enabled. If the
DIFSENS line is LOW, indicating a
single ended device, the LX5255 output
will be HiZ. If the DIFSENS line is
HIGH, indicating a HVD device, the
LX5255 output will be HiZ.
The LX5255 has a TTL compatible
sleep/disable mode. Applying a logic
HIGH to the DISC pin puts the LX5255
in sleep mode. During sleep mode,
power dissipation is reduced to a meager
5μA while also placing all outputs and
the DIFSENS function in a HiZ state.
Compliant with SPI-2 (Ultra2),
SPI-3 (Ultra160), and SPI-4
(Ultra320)
2.5pF Maximum Disabled Output
Capacitance
Fast Response, No External
Capacitors Required
5µA Supply Current in Disconnect
Mode
30mA Supply During Normal
Operation
Logic Command Disconnects All
Termination Lines
DIFSENS Line Driver
Current Limit and Thermal
Protection
Pin Compatible With Unitrode
UCC5640
IMPORTANT:
For the most current data, consult
MICROSEMI’s
website:
http://www.microsemi.com
TYPICAL APPLICATION
-
-
+
L X 5255
+
L X 5255
LX5255 Typical Application
LX5255
LX5255
PACKAGE ORDER INFO
Plastic TSSOP
PW
24-Pin
T
A
(°C)
0 to 70
LX5255CPW
RoHS Compliant / Pb-free
Transition DC: 0442
Note: Available in Tape & Reel. Append the letters “TR” to the
part number. (i.e. LX5255CPW-TR)
Copyright
©
2000
Rev. 1.1, 2006-02-27
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
MICROSEMI [ MICROSEMI CORPORATION ]
