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LIN DOC #:
5204
LX5204
9-LINE HOT SWA P, µPOWER SCSI TERMINATOR
THE INFINITE POWER OF INNOVATION
DESCRIPTION KEY FEATURES
The LX5204 is a nine-line active terminator
for the SCSI parallel bus. This SCSI standard
recommends active termination at both
ends of the SCSI bus. The LX5204 has the
added features of hot swappability, fully
complying with the SCSI hot swap specification.
During disconnect mode, the LX5204 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, errorfree communications.
IMPORTANT: For the most current data, consult LinFinity's web site: http://www.linfinity.com.
During normal operation, the LX5204
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 LX5204 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 LX5204 sinks up to 150mA of current,
making it compatible with today's fast
active negation drivers.
The LX5204 is a superior, pin-for-pin
replacement for a variety of industry products such as the UC5603 and UC5613.
P RODUCTION DATA SHEET
■ 3.5pF OUTPUT CAPACITANCE DURING
DISCONNECT
■ HOT SWAP COMPATIBLE
■ 60µA SUPPLY CURRENT IN DISCON-
NECT MODE
■ 600µA SUPPLY CURRENT DURING
NORMAL OPERATION
■ 150mA 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: 5204TR
PRODUCT HIGHLIGHT
RECEIVING WAVEFORM - 10MHZ DRIVING WAVEFORM - 10MHZ
Receiver
1 Meter, AWG 28
LX5204 LX5204
LX5268 LX5268
PACKAGE ORDER INFORMATION
TA (°C)
0 to 70 LX5204CPWP LX5204CDP
Note: All surface-mount packages are available in Tape & Reel.
Append the letter "T" to part number. (i.e. LX5204CDPT)
Plastic TSSOP
PWP
24-pin, Power
Driver
Plastic SOIC
DP
16-pin, Power
NOTE:
For An In-Depth
Discussion On Applying
SCSI, Request Linfinity
Application Note:
"Understanding The
Single-Ended SCSI Bus"
Copyright © 1997
Rev. 1.1 12/96
L INFINITY MICROELECTRONICS INC.
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
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LX5204
PRODUCT DATABOOK 1996/1997
9-LINE HOT SWA P, µPOWER SCSI TERMINATOR
RODUCTION DATA SHEET
P
ABSOLUTE MAXIMUM RATINGS (Note 1)
TermPwr Voltage ......................................................................................................... +7V
Signal Line Voltage ............................................................................................ 0V to +7V
Regulator Output Current ........................................................................................... 0.4A
Operating Junction Temperature
Plastic (PWP, DP Packages) ................................................................................. 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
PWP PACKAGE:
THERMAL RESISTANCE-JUNCTION TO LEADS,
THERMAL RESISTANCE-JUNCTION TO AMBIENT,
θθ
θ
θθ
JL
θθ
θ
θθ
JA
DP PACKAGE:
THERMAL RESISTANCE-JUNCTION TO LEADS,
THERMAL RESISTANCE-JUNCTION TO AMBIENT,
Junction Temperature Calculation: TJ = TA + (P
numbers are guidelines for the thermal performance of the device/pc-board system.
The θ
JA
All of the above assume no ambient airflow.
θ
D
θθ
θθ
JL
x θ
θθ
θ
θθ
JA
).
JA
27°C/W
60°C/W
20°C/W
45°C/W
PACKAGE PIN OUTS
1 24
T7
223
T8
322
T9
421
520
619
718
817
916
10 15
11 14
T1
12 13
T2
PWP PACKAGE
T7
T8
T9
N.C.
{
GND
T1
T2
DP PACKAGE
Heatsink
DISCONNECT
Heatsink
DISCONNECT
N.C.
GND
N.C.
N.C.
N.C.
N.C.
(Top View)
1 16
215
314
413
512
611
710
89
(Top View)
T6
T5
REG OUT
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
V
T4
T3
T6
T5
REG OUT
N.C.
N.C.
V
TERM
T4
T3
TERM
Heatsink
Heatsink
POWER UP / POWER DOWN FUNCTION TABLE
Disconnect Outputs
L Enabled 600µA
H HI Z 60µA
Open HI Z 60µA
Quiescent
Current
2
Copyright © 1996
Rev. 1.1 12/96
Page 3
PRODUCT DATABOOK 1996/1997
LX5204
9-LINE HOT SWA P, 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 Capacitor on REGOUT
Operating Virtual Junction Temperature Range
LX5204C
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
Hot Swap
= -5mA to -15mA, TA = 25°C
TERM
= -5mA to -15mA
I
TERM
= 0.5V, TA = 25°C
OUT
V
= 0.5V, 0°C ≤ TA ≤ 70°C
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
TERM
= 0V to 5.25V
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 -50mA
REG
= -50mA
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
2.2 µF
0 125 °C
LX5204
Min. Typ. Max.
0.6 1.2 mA
194 208 mA
60 100 µA
104 110 116 Ω
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
3.5 pF
20 30 mA
Fully Compliant
3.6 V
10 20 mV
20 50 mV
0.7 1.0 V
-200 -350 mA
150 °C
0.8 2.0 V
40 µA
Copyright © 1996
Rev. 1.1 12/96
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LX5204
DISCONNECT
PRODUCT DATABOOK 1996/1997
9-LINE HOT SWA P, µPOWER SCSI TERMINATOR
RODUCTION DATA SHEET
P
BLOCK DIAGRAM
FIGURE 1 — LX5204 BLOCK DIAGRAM
REG OUT
V
TERM
V
TERM
Channel
1 of 9
5V
2.2µF
DISCONNECT
2.2µF
TERM POWER
V
TERM
LX5204
REGOUT
VBG
~
DB (0)
~
DB (1)
~
DB (6)
~
DB (7)
~
DB (P)
APPLICATION SCHEMATIC
FIGURE 2 — 8-BIT SCSI SYSTEM APPLICATION
HOST
PERIPHERAL
DB (0)
DB (1)
DB (6)
DB (7)
DB (P)
V
TERM
TERM POWER
LX5204
V
TERM
REGOUT
T0
T8
2.2µF
2.2µF
5V
DISCONNECTDISCONNECT
V
TERM
TERMPWR
2.2µF
Copyright © 1996
Rev. 1.1 12/96
TERMPWR
V
TERM
LX5204
DISCONNECT
2.2µF
Note: Add third LX5204 for 16-bit SCSI
REGOUT
~
ATN
~
BSY
~
ACK
~
RST
~
MSG
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
ATN
BSY
ACK
RST
MSG
LX5204
REGOUT
4
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