LIN D O C #: 5212
LX5212
9-LINE LOW CAPACITANCE, µP OWER SCSI TERMINATOR
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DESCRIPTION
D
The LX5212 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 LX5212 requires a meager 500nA of supply current
while offering only 2.5pF of output capacitance. To enter this low-power mode, the
disconnect pin can be left open (floating)
or driven high, thereby disconnecting the
terminating 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 LX5212
s 2.5pF OUTPUT CAPACITANCE DURING
DISCONNECT
consumes only 600µA of current, which is
the lowest enabled supply current of any
terminator available on the market today.
Linfinity's proprietary BiCMOS low dropout
regulator architecture enables this unique
and very efficient operating characteristic.
The LX5212 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 LX5212 sinks up to 30mA of current,
making it compatible with today's fast active
negation drivers.
The LX5212 is a superior, pin-for-pin
replacement for a variety of industry products, such as the UC5614.
s 500nA SUPPLY CURRENT IN DISCONNECT
MODE
s 600µA SUPPLY CURRENT DURING NORMAL
OPERATION
s 30mA SINK CURRENT FOR ACTIVE
NEGATION
s LOGIC COMMAND DISCONNECTS ALL
TERMINATION LINES
s CURRENT LIMIT AND THERMAL PROTECTION
s COMPATIBLE WITH SCSI 1, 2, 3, AND FAST
20 STANDARDS
s HOT SWAP COMPATIBLE
s CONSULT FACTORY FOR APPLICATION TEST
REPORT: 5212TR
s EVALUATION BOARD AVAILABLE
IMPORTANT: For the most current data, consult LinFinity's web site: http://www.linfinity.com.
PRODUCT HIGHLIGHT
R E C E I V I N G W AV E F O R M - 20MHZ
D R I V I N G W AV E F O R M - 20MHZ
Receiver
Driver
1 Meter, AWG 28
LX5212
LX5212
LX5268
LX5268
NOTE:
For An In-Depth
Discussion On Applying
SCSI, Request Linfinity
Application Note:
"Understanding The
Single-Ended SCSI Bus"
PA C K A G E O R D E R I N F O R M AT I O N
TA (°C)
0 to 70
N Plastic DIP
16-pin
LX5212CN
PWP Plastic TSSOP
24-pin, Power
LX5212CPWP
DP Plastic SOIC
16-pin, Power
LX5212CDP
Note: All surface-mount packages are available in Tape & Reel.
Append the letter "T" to part number. (i.e. LX5212CDPT)
Copyright © 1997
Rev. 1.8 11/97
LINFINITY MICROELECTRONICS INC.
11861 W ESTERN A VENUE, G ARDEN G ROVE, CA. 92841, 714-898-8121, F AX: 714-893-2570
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