LX5255_06 Datasheet, PDF (1/7 Pages) Microsemi Corporation – 9-Line LVD SCSI Terminator

LX5255
TM
®
9-Line LVD SCSI Terminator
PRODUCTION DATA SHEET
DESCRIPTION
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.
KEY FEATURES
ƒ Compliant with SPI-2 (Ultra2),
SPI-3 (Ultra160), and SPI-4
(Ultra320)
ƒ 2.5pF Maximum Disabled Output
Capacitance
ƒ Fast Response, No External
Capacitors Required
ƒ 5µA Supply Current in Disconnect
Mode
ƒ 30mA Supply During Normal
Operation
ƒ Logic Command Disconnects All
Termination Lines
ƒ DIFSENS Line Driver
ƒ Current Limit and Thermal
Protection
ƒ Pin Compatible With Unitrode
UCC5640
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
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LX5255 ₊
TYPICAL APPLICATION
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LX5255
LX5255 Typical Application
Copyright © 2000
Rev. 1.1, 2006-02-27
PACKAGE ORDER INFO
T_A (°C)
Plastic TSSOP
PW _24-Pin
RoHS Compliant / Pb-free
Transition DC: 0442
0 to 70
LX5255CPW
Note: Available in Tape & Reel. Append the letters “TR” to the
part number. (i.e. LX5255CPW-TR)
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]
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