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Microsemi Corporation - MULTIMODE SCSI TERMINATOR

Numéro de référence LX5242
Description MULTIMODE SCSI TERMINATOR
Fabricant Microsemi Corporation 
Logo Microsemi Corporation 





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LX5242 fiche technique

LX5241/5242/5243
    
THE INFINITE POWER OF INNOVATION
    

The LX5241/42/43 is a multimode SCSI
terminator that is compatible with to the SCSI
SPI02 (Ultra2 SCSI), SCSI SPI-3 (Ultra3 SCSI or
Ultra160 SCSI), and pending 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 LX5241/42/43 utilizes Linfinity’s
UltraMAX technology which delivers the ultimate
in SCSI bus performance while saving component
cost and board area. Elimination of the external
capacitors also mitigates the need for a lengthy
capacitor selection process. The individual high
bandwidth drivers also maximize channel
separation and reduce channel to channel noise and
cross talk. The high bandwidth architecture insures
ULTRA2 performance while providing a clear
migration path to ULTRA3 and beyond.
When the LX5241/42/43 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 15mA. Tying the DIFFSENSE pin high places
the LX5241/42/43 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 LX5241/42/43 have
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.
Another key feature of the LX5241/42/43 is the
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
 
 Auto-Selectable LVD or Single-
Ended Termination
 3.0pF Maximum Disabled Output
Capacitance
 Fast Response, No External
 Capacitors Required
Compatible with Active Negation
 Drivers
15µA Supply Current in
Disconnect Mode
 Logic Command Disconnects All
Termination Lines
 Diffsense Line Driver
 Ground Driver Integrated for
Single-Ended Operation
 Current Limit and Thermal
Protection
 Hot-Swap Compatible (Single-
Ended)
 Ultra160 compliant
 See LX5245/5246 for LVD
Termination Only
 Pin Compatible With DS2119
and UCC5630
  
BUS VOLTAGE 6
VOD
V(+)
V(-)
100mV
0V
-100mV
VOD = V(-) - V(+), Logic = 0
NEGATED
-
LX5241 +
-
+ LX5241
Copyright © 2000
Rev. 1.4,2000-11-28
TA (°C)
0 to 70
   
Plastic TSSOP
Plastic TSSOP
DB 36-Pin
PW 24-Pin
LX5241CDBK
LX5241CPWK
LX5242CDBK
LX5242CPWK
Plastic TSSOP
PW 28-Pin
LX5243CPW
-
Note: Available in Tape & Reel.
Append the letter “T” to the part number. (i.e. LX5241CDBT)
LINFINITY MICROELECTRONICS INC.
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
1

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