LX5250 Datasheet, PDF (1/8 Pages) Microsemi Corporation – 9-Line Multimode SCSI Terminator

LX5250/5252
TM
®
9-Line Multimode SCSI Terminator
PRODUCTION DATA SHEET
DESCRIPTION
The LX5250/52 is a multimode SCSI
terminator that is compatible with the
SCSI SPI-2 (Ultra2 SCSI), SCSI SPI-3
(Ultra3 SCSI or Ultra160 SCSI), and
SCSI SPI-4 (Ultra320) specifications
developed by the T10 standards
committee for low voltage differential
(LVD) termination, while providing
backwards compatibility to the SCSI,
SCSI-2, and SPI single-ended
specifications. Multimode compatibility
permits the use of legacy devices on the
bus without hardware alterations.
Automatic mode selection is achieved
through voltage detection on the
Diffsense line.
The LX5250/52 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 LX5250/52 is enabled, the
differential sense (DIFFSENSE) pin
supplies a voltage between 1.2V and
1.4V. In application this pin is tied to the
DIFFSENSE input of the corresponding LVD
transceivers. This action enables the LVD
transceiver function. DIFFSENSE is capable of
supplying a maximum of 10mA.
Tying the DIFFSENSE pin high places the
LX5250/52 in a HI Z state indicating the
presence of an HVD device. Tying the pin low
places the part in a single-ended mode while
also signaling the multimode transceiver to
operate in a single-ended mode.
Recognizing the needs of portable and
configurable peripherals, the LX5250/52 has a
TTL compatible sleep/disable mode. During
this sleep/disable mode, power dissipation is
reduced to a meager 15uA while also placing
all outputs in a HI Z state. Also during
sleep/disable mode, the DIFFSENSE function
is disabled and is placed in a HI Z state.
The LX5250/52 also provides a master /
slave function. Driving this pin high or
floating the pin enables the 1.3V DIFFSENSE
reference. Driving the pin low disables the on
board DIFFSENSE reference and enables use
of an external master reference device.
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
KEY FEATURES
ƒ Compliant with SCSI SPI-2
(Ultra2), SPI-3 (Ultra160), and
SPI-4 (Ultra320)
ƒ Auto-Selectable LVD or Single-
Ended Termination
ƒ Fast Response, No Output
Capacitors Required
ƒ Compatible with Active Negation
Drivers
ƒ 15µA Supply Current in
Disconnect Mode
ƒ Logic Command Disconnects All
Termination Lines
ƒ Diffsense Line Driver
ƒ Ground Driver Integrated for
Single-Ended Operation
ƒ Current Limit and Thermal
Protection
ƒ Hot-Swap Compatible (Single-
Ended)
ƒ Available in 36-pin QSOP and 28-
pin TSSOP package
ƒ LX5250, 36-pin QSOP: Pin
Compatible With DS2118,
UCC5630A and UCC5672
ƒ LX5250 28-pin TSSOP: Pin
Compatible with DS2119, and
UCC5672
-
LX5250/
LX5252 ⁺
PRODUCT HIGHLIGHT
-
+
LX5250/
LX5252
Copyright © 2002
Rev. 1.2b, 2005-08-29
T_A (°C)
0 to 70
PACKAGE ORDER INFO
QSOP
DB 36-Pin
RoHS Compliant / Pb-free
Transition DC: 0535
TSSOP
PW 28-Pin
RoHS Compliant / Pb-free
Transition DC: 0518
LX5250CDB
LX5252CDB
LX5250CPW
-
Note: Available in Tape & Reel.
Append the letters “TR” to the part number. (i.e. LX5250CDB-TR)
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]
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