Microsemi Corporation LX5208CDWP Datasheet
LIN DOC #:
LX5208
18-LINE LOW CAPACITANCE, µPOWER SCSI TERMINATOR
5208
THE INFINITE POWER OF INNOVATION
DESCRIPTION KEY FEATURES
The LX5208 is an eighteen-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 LX5208 requires a meager 60µA of supply current while
offering only 3.5pF 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 LX5208 consumes only 800µA 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 LX5208 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 LX5208 sinks
up to 200mA of current making it compatible
with today's fast active negation drivers.
The LX5208 is a superior, pin-for-pin replacement for a variety of industry products
such as the UC5601, UC5602, UC5608, and
UC5609.
PRODUCT HIGHLIGHT
P RODUCTION DATA SHEET
■ 3.5pF OUTPUT CAPACITANCE DURING
DISCONNECT
■ 60µA SUPPLY CURRENT IN DISCON-
NECT MODE
■ 800µA SUPPLY CURRENT DURING
NORMAL OPERATION
■ 200mA SINK CURRENT FOR ACTIVE
NEGATION
■ LOGIC COMMAND DISCONNECTS ALL
TERMINATION LINES
■ CURRENT LIMIT AND THERMAL
PROTECTION
■ COMPATIBLE WITH SCSI 1, 2 AND 3
STANDARDS
■ CONSULT FACTORY FOR APPLICATION
TEST REPORT: 5208TR
RECEIVING WAVEFORM - 10MHZ DRIVING WAVEFORM - 10MHZ
Receiver
Driver
1 Meter, AWG 28
LX5208 LX5208
NOTE:
LX5268 LX5268
For An In-Depth
Discussion On Applying
SCSI, Request Linfinity
PACKAGE ORDER INFO
TA (°C)
0 to 70 LX5208CDWP
Note: All surface-mount packages are available in Tape & Reel.
Append the letter "T" to part number. (i.e. LX5208CDWPT)
Plastic SOWB
DWP
28-pin, Power
Application Note:
"Understanding The
Single-Ended SCSI Bus"
Copyright © 1998
Rev. 1.9 3/98
FOR FURTHER INFORMATION CALL (714) 898-8121
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841 1
LX5208
PRODUCT DATABOOK 1996/1997
18-LINE LOW CAPACITANCE, µPOWER SCSI TERMINATOR
RODUCTION DATA SHEET
P
ABSOLUTE MAXIMUM RATINGS (Note 1)
TermPwr Voltage ......................................................................................................... +7V
Signal Line Voltage ............................................................................................ 0V to +7V
Regulator Output Current ........................................................................................... 1.2A
Operating Junction Temperature
Plastic (DWP Package).......................................................................................... 150°C
Storage Temperature Range ...................................................................... -65°C to 150°C
Lead Temperature (Soldering, 10 seconds) ............................................................. 300°C
Note 1. Exceeding these ratings could cause damage to the device. All voltages are with respect
to Ground. Currents are positive into, negative out of the specified terminal.
THERMAL DATA
DWP PACKAGE:
D
θθ
θ
θθ
JL
x θ
θθ
θ
θθ
JA
).
JA
THERMAL RESISTANCE-JUNCTION TO LEADS,
THERMAL RESISTANCE-JUNCTION TO AMBIENT,
Junction Temperature Calculation: T
numbers are guidelines for the thermal performance of the device/pc-board system.
The θ
JA
All of the above assume no ambient airflow.
= TA + (P
J
18°C/W
40°C/W
POWER UP / POWER DOWN FUNCTION TABLE
Disconnect Outputs
L Enabled 800µA
H HI Z 60µA
Open HI Z 60µA
Quiescent
Current
PACKAGE PIN OUTS
DISCONNECT
HEAT SINK
HEAT SINK
HEAT SINK
V
128
T1
227
T2
326
T3
425
T4
524
T5
623
722
821
920
T6
10 19
T7
11 18
T8
12 17
T9
13 16
14 15
TERM
DWP PACKAGE
(Top View)
GND
T18
T17
T16
T15
T14
HEAT SINK
HEAT SINK
HEAT SINK
T13
T12
T11
T10
REG OUT
2
Copyright © 1998
Rev. 1.9 3/98
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