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LX5248 Datasheet(PDF) 1 Page - Microsemi Corporation

Part No. LX5248
Description  9 - LINE LVD SCSI TERMINATOR
Download  6 Pages
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Maker  MICROSEMI [Microsemi Corporation]
Homepage  http://www.microsemi.com
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LX5248 Datasheet(HTML) 1 Page - Microsemi Corporation

   
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9-L IN E LVD SCSI T ERMIN ATOR
P RELIMINA R Y D AT A S HEET
T HE
I NFINITE
P OWER
OF
I NNO V A TION
LX5248/LX5249
DESCRIPTION
KEY FE A TURES
s 2.5pF Typical Disabled Output
Capacitance
s Fast Response, No External Capacitors
Required
s 5µA Supply Current In Disconnect Mode
s 20mA Supply Current During Normal
Operation
s Logic Command Disconnects All
Termination Lines
s Diffsense Line Driver
s Current Limit And Thermal Protection
s Compatible With The Pending SPI-2 LVD
Specification
s Pin Compatible With Industry Standard
Multi-Mode Terminators
s For UCC5240 Pin Compatible LVD ONLY
Terminator (See LX5245/5246)
PRODUCT HIGHLIGHT
The LX5248/49 IC is a Low Voltage Dif-
ferential (LVD) Terminator designed to
comply with the LVD termination specifica-
tion in the SPI-2 document.
The LX5248/
49 is designed specifically for LVD applica-
tions. Because the LX5248/49 supports only
LVD, it has lower output capacitance than
multimode terminators such as the LX5240.
The LX5248/49 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 band-
width drivers also maximize channel sepa-
ration and reduces channel-to-channel noise
and cross talk.
The high-bandwidth
UltraMAX architecture insures ULTRA-2 per-
formance, while providing a clear migration
path to ULTRA-3 and beyond.
When The LX5248/49 Is Enabled, The
Differential Sense (DIFFSENSE) Pin Sup-
plies A Voltage Between 1.2V And 1.4V.
In application, the terminator DIFFSENSE
output is connected to the system
DIFFSENSE line. If there are no single ended
or HVD devices attached to the system the
LVD output will be enabled.
If the
DIFFSENSE line is LOW, indicating a single
ended device, the LX5248/49 output will be
HiZ. If the DIFFSENSE line is HIGH, indi-
cating a high voltage differential device the
LX5248/49 output will be HiZ.
The LX5248/49 IC Has A TTL Compat-
ible DISCONNECT Pin. The LX5248/49 is
active LOW.
During sleep mode, power
dissipation is reduced to a meager 5µA, while
also placing all outputs in a HI Z state. Also
during sleep mode, the DIFFSENSE function
is disabled and is placed in a HI Z state.
V
(+)
V
(-)
V
OD = V(-) - V(+), Logic = 0
NEGATED
0V
100mV
-100mV
LX5248/49
LX5248/49
B U S V O L T AGE / V
OD
UltraMAX
TM
Note: All surface-mount packages are available in Tape & Reel.
Append the letter "T" to part number. (i.e. LX5249CPWT)
Copyright © 2001
Rev. 0.6 10/00
1
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
L I N F INITY M ICROELECTRONICS I NC .
NOTE: For current data & package dimensions, visit our web site: http://www.linfinity.com.
0 to 70KLX5249CDBKLX5249CPWKLX5248CPW
P ACKAGE ORDER INFORM A T ION
T
A (°C)
DB Plastic SSOP
36-pin
PW Plastic TSSOP
24-pin
PW Plastic TSSOP
28-pin


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