LX5203 Datasheet, PDF (1/4 Pages) Microsemi Corporation – 9-LINE SCSI ACTIVE TERMINATOR

T H E I N F I N I T E P O W E R O F I N N O VAT I O N
L I N D O C #: 5203
LX5203
9-LINE SCSI ACTIVE TERMINATOR
PR O D U C T I O N D ATA S H E E T
DESCRIPTION
The LX5203 is a nine-line active terminator
for the SCSI parallel bus. This SCSI standard
recommends active termination at both ends
of the SCSI bus.
During disconnect mode, the LX5203 re-
quires a meager 60µA of supply current,
while offering only 6pF of output capaci-
tance. To enter this low-power mode, the
disconnect pin can be left open (floating) or
driven high, thereby disconnecting the ter-
minating resistors and placing the internal
low dropout regulator into low-power mode.
In disconnect mode each termination line
presents a high impedance to the SCSI bus
with the overall effect being to preserve high
signal integrity and yield subsequent reliable,
error-free communications.
During normal operation, the LX5203 con-
sumes only 600µA of current. Linfinity's
proprietary BiCMOS low dropout regulator
architecture enables oscillation-free opera-
tion with minimal output capacitance.
Linfinity recommends a minimum stabiliza-
tion capacitor value of 2.2µF.
The LX5203 also offers a precisely trimmed
channel output current specified to a 5%
tolerance. The maximum value of the output
current is trimmed as closely as possible to
the SCSI standard maximum specification to
give the highest possible noise margin for
fast SCSI operation. And the LX5203 sinks
up to 150mA of current making it compatible
with today's fast active negation drivers.
The LX5203 is a superior, pin-for-pin re-
placement for a variety of industry products
such as the UC5603 and UC5613.
IMPORTANT: For the most current data, consult LinFinity's web site: http://www.linfinity.com.
KEY FEATURES
s 6pF OUTPUT CAPACITANCE DURING
DISCONNECT
s 60µA SUPPLY CURRENT IN DISCON-
NECT MODE
s 600µA SUPPLY CURRENT DURING
NORMAL OPERATION
s 150mA SINK CURRENT FOR ACTIVE
NEGATION
s LOGIC COMMAND DISCONNECTS ALL
TERMINATION LINES
s CURRENT LIMIT AND THERMAL
PROTECTION
s COMPATIBLE WITH SCSI 1, 2 AND 3
STANDARDS
s CONSULT FACTORY FOR APPLICATION
TEST REPORT: 5203TR
PRODUCT HIGHLIGHT
R E C E I V I N G W AV E F O R M - 5 M H Z
D R I V I N G W AV E F O R M - 5 M H Z
Copyright © 1997
Rev. 1.9 7/97
Receiver
Driver
LX5203
1 Meter, AWG 28
LX5203
LX5268
LX5268
PACKAGE ORDER INFORMATION
T_A (°C)
N
Plastic DIP
16-pin
DP
Plastic SOIC
16-pin, Power
0 to 70
LX5203CN
LX5203CDP
Note: All surface-mount packages are available in Tape & Reel.
Append the letter "T" to part number. (i.e. LX5203CDPT)
NOTE:
For An In-Depth
Discussion On Applying
SCSI, Request Linfinity
Application Note:
"Understanding The
Single-Ended SCSI Bus"
LINFINITY MICROELECTRONICS INC.
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: [phone]
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