LX5248 Datasheet, PDF (1/6 Pages) Microsemi Corporation – 9 - LINE LVD SCSI TERMINATOR

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UltraMAX^{TM LX5248/LX5249}
9-LINE LVD SCSI TERMINATOR
PRELIMINARY DATA SHEET
DESCRIPTION
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.
NOTE: For current data & package dimensions, visit our web site: http://www.linfinity.com.
BUS VOLTAGE/
PRODUCT HIGHLIGHT
KEY FEATURES
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)
V _OD
V_OD = V_(-) - V₍₊₎, Logic = 0
V₍₊₎
NEGATED
100mV
0V
V_(-)
-100mV
LX5248/49
LX5248/49
T_A (°C)
0 to 70K
PACKAGE ORDER INFORMATION
DB
Plastic SSOP
36-pin
PW
Plastic
24-pin
TSSOP
PW
Plastic
28-pin
TSSOP
LX5249CDBK
LX5249CPWK
LX5248CPW
Note: All surface-mount packages are available in Tape & Reel.
Append the letter "T" to part number. (i.e. LX5249CPWT)
LINFINITY MICROELECTRONICS INC.
Copyright © 2001
Rev. 0.6 10/00
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: [phone]
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