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LIN DOC #:
LX5202
18-LINE, µPOWER SCSI TERMINATOR
5202
THE INFINITE POWER OF INNOVATION
DESCRIPTION KEY FEATURES
The LX5202 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 LX5202 requires a meager 60µA of supply current while
offering only 6pF 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, errorfree communications.
During normal operation, the LX5202 con-
IMPORTANT: For the most current data, consult LinFinity's web site: http://www.linfinity.com.
sumes 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 LX5202 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 LX5202 sinks
up to 200mA of current making it compatible
with today's fast active negation drivers.
The LX5202 is a superior, pin-for-pin replacement for a variety of industry products
such as the UC5601 and UC5602.
PRODUCT HIGHLIGHT
P RODUCTION DATA SHEET
■ 6pF 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: 5202TR
RECEIVING WAVEFORM - 5MHZ DRIVING WAVEFORM - 5MHZ
Receiver
Driver
1 Meter, AWG 28
LX5202 LX5202
NOTE:
LX5268 LX5268
For An In-Depth
Discussion On Applying
SCSI, Request Linfinity
PACKAGE ORDER INFO
TA (°C)
0 to 70 LX5202CDWP
Note: All surface-mount packages are available in Tape & Reel.
Append the letter "T" to part number. (i.e. LX5202CDWPT)
Plastic SOWB
DWP
28-pin, Power
Application Note:
"Understanding The
Single-Ended SCSI Bus"
Copyright © 1998
Rev. 1.9 3/98
L INFINITY MICROELECTRONICS INC.
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
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LX5202
PRODUCT DATABOOK 1996/1997
18-LINE, 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
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Copyright © 1998
Rev. 1.9 3/98
Page 3
PRODUCT DATABOOK 1996/1997
LX5202
18-LINE, µPOWER SCSI TERMINATOR
P RODUCTION DATA SHEET
RECOMMENDED OPERATING CONDITIONS (Note 2)
Parameter
TermPwr Voltage V
Symbol
TERM
Signal Line Voltage
Disconnect Input Voltage
Output Capacitance on REGOUT
Operating Virtual Junction Temperature Range
LX5202C
Note 2. Range over which the device is functional.
ELECTRICAL CHARACTERISTICS
(Unless otherwise specified, these specifications apply over the operating ambient temperature range of 0°C ≤ TA ≤ 70°C. TermPwr = 4.75V, Disconnect = 0V. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient temperature.)
Parameter
Symbol
Test Conditions Units
Supply Current Section
TermPwr Supply Current All term lines = Open
All term lines = 0.5V
Power Down Mode Disconnect = Open
Output Section (Terminator Lines)
Terminator Impedance I
Terminator Output High Voltage
Max. Output Current V
Output Leakage Disconnect = Open, V
Output Capacitance Disconnect = Open
Sink Current V
= -5mA to -15mA
TERM
= 0.5V, TA = 25°C
OUT
= 0.5V, 0°C ≤ TA ≤ 70°C
V
OUT
V
OUT
V
OUT
OUT
= 0.5V, V
= 0.5V, V
= 4V
= 4V, TA = 25°C
TERM
= 4V, 0°C ≤ TA ≤ 70°C
TERM
= 0V to 5.25V
TERM
Regulator Section
Regulator Output Voltage
Line Regulation V
Load Regulation I
Drop Out Voltage I
Short Circuit Current V
= 4V to 6V
TERM
= 0 to -100mA
REG
= -100mA
REG
= 0V
REG
Thermal Shutdown
Disconnect Section
Disconnect Threshold
Input Current Disconnect = 0V
Recommended Operating Conditions
Min. Typ. Max.
Units
4 5.25 V
05V
0V
TERM
V
4.7 µF
070°C
LX5202
Min. Typ. Max.
0.8 1.5 mA
390 430 mA
60 100 µA
100 110 120 Ω
2.7 2.9 V
-20.3 -21.8 -23 mA
-19.0 -21.8 -23 mA
-19.5 -21.8 -23 mA
-18.0 -21.8 -23 mA
10 400 nA
6pF
58 70 mA
3.6 V
10 20 mV
20 50 mV
0.45 1.0 V
-700 -1000 mA
150 °C
0.8 2.0 V
40 µA
Copyright © 1998
Rev. 1.9 3/98
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LX5202
DISCONNECT
PRODUCT DATABOOK 1996/1997
18-LINE, µPOWER SCSI TERMINATOR
RODUCTION DATA SHEET
P
BLOCK DIAGRAM
FIGURE 1 — LX5202 BLOCK DIAGRAM
REG OUT
V
TERM
V
TERM
Channel
1 of 18
5V
4.7µF
DISCONNECT
4.7µF
TERM POWER
V
TERM
LX5202
REGOUT
VBG
Narrow
~
DB (0)
~
DB (1)
~
DB (14)
~
DB (15)
~
DB (P1)
APPLICATION SCHEMATIC
FIGURE 2 — 8/16-BIT SCSI SYSTEM APPLICATION
HOST
PERIPHERAL
Narrow
DB (14)
DB (15)
DB (P1)
DB (0)
DB (1)
V
TERM
TERM POWER
LX5202
V
TERM
REGOUT
T0
T17
4.7µF
4.7µF
5V
DISCONNECTDISCONNECT
V
TERM
TERMPWR
2.2µF
Copyright © 1998
Rev. 1.9 3/98
TERMPWR
DISCONNECT
2.2µF
V
TERM
LX5203
REGOUT
Wide
~
MSG
~
RST
~
ACK
~
BSY
~
ATN
PRODUCTION DATA - Information contained in this document is proprietary to LinFinity, and is current as of publication date. This document
may not be modified in any way without the express written consent of LinFinity. Product processing does not necessarily include testing of
all parameters. Linfinity reserves the right to change the configuration and performance of the product and to discontinue product at any time.
SCSI CABLE
Wide
MSG
RST
ACK
BSY
ATN
LX5203
REGOUT
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