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PDF LX5243 Data sheet ( Hoja de datos )
| Número de pieza | LX5243 | |
| Descripción | MULTIMODE SCSI TERMINATOR | |
| Fabricantes | Microsemi Corporation | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LX5243 (archivo pdf) en la parte inferior de esta página. Total 7 Páginas | ||
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™
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
1 page  
PRODUCT DATABOOK 1996/1997
UltraMAX
LX5241/5242/5243
MULTIMODE SCSI TERMINATOR
PRODUCTION DATA SHEET
FUNCTIONAL PIN DESCRIPTION
Pin
Designator
Description
1-, 2-, 3-, 4-, 5-, 6-, 7-, 8-, 9-6 Negative signal termination lines for LVD mode. Signal termination lines for SE mode.
1+, 2+, 3+, 4+, 5+, 6+, 7+, 8+, 9+ Positive signal termination lines for LVD mode. Pseudo-ground lines for SE mode.
VTERM
DISCONNECT6
Power supply pin for terminator. Connect to SCSI bus TERMPWR. Must be decoupled by one 4.7µF
low-ESR capacitor for every three terminator devices. It is absolutely necessary to connect this pin to
the decoupling capacitor through a very low impedance (big traces on PCB). Keeping distances very
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decoupling with 0.1µF capacitors right at VTERM pin.
Enables / disables terminator. See Power Down Function Table for logic levels per device.
GND6
Terminator ground pin. Connect to ground.
MASTER / SLAVE6
Sometimes referred to as M/S pin in this data sheet. Used to select which terminator is the control-
ling device. MASTER/SLAVE pin High or Open enables the DIFFSENSE output drive. Please see
MASTER/SLAVE Function Table.
DIFFSENSE6
This is a dual function pin. It drives the SCSI bus DIFFSENS line. It is also the sense pin to detect the
SCSI bus mode (LVD, SE or HVD). DIFFSENSE output drive can be disabled with Low level on the
MASTER/SLAVE pin. Please see DIFFSENSE and MASTER/SLAVE Function Tables. Internally
connected to DIFFB pin through 20kOhm resistor.
DIFFB6
Internally connected to DIFFSENSE pin through 20kOhm resistor. It can be used as a mode sense
pin when the device is a non-controlling terminator (MASTER/SLAVE pin is Low). An RC filter
(20kOhm / 0.1µF) is not required on the LX5241/42/43, as it has an internal timer.
SE6 Single-ended output; when High, terminator is operating in SE mode.
LVD6
Low Voltage Differential output. When High, terminator is operating in LVD mode.
HVD6
High Voltage Differential output. When High, terminator is operating in HVD mode.
HEATSINK6
Attached to die mounting pad, but not bonded to GND pin. Pins should be considered a heat sink
only, and not a true ground connection. It is recommeneded that these pins be connected to ground,
but can be left floating.
Copyright © 2000
Rev. 1.4 11/00
5
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet LX5243.PDF ] | |
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