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LIN D O C #: 5202
LX5202
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DESCRIPTION
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 60A 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 consumes only 800A 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.
K E Y F E AT U R E S
s 6pF OUTPUT CAPACITANCE DURING DISCONNECT s 60A SUPPLY CURRENT IN DISCONNECT MODE s 800A SUPPLY CURRENT DURING NORMAL OPERATION s 200mA 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: 5202TR
IMPORTANT: For the most current data, consult LinFinity's web site: http://www.linfinity.com.
PRODUCT HIGHLIGHT
RE C E I V I N G WAV E F O R M - 5 M HZ
D R I V I N G WAV E F O R M - 5MHZ
Receiver 1 Meter, AWG 28 LX5202 LX5268
Driver LX5202 LX5268
PA C K A G E O R D E R I N F O TA (C) 0 to 70
DWP Plastic SOWB 28-pin, Power
LX5202CDWP
NOTE: For An In-Depth Discussion On Applying SCSI, Request Linfinity Application Note: "Understanding The Single-Ended SCSI Bus"
Note: All surface-mount packages are available in Tape & Reel. Append the letter "T" to part number. (i.e. LX5202CDWPT)
Copyright (c) 1998 Rev. 1.9 3/98
LINFINITY MICROELECTRONICS INC.
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
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LX5202
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A B S O L U T E M A X I M U M R AT I N G S
(Note 1)
PACKAGE PIN OUTS
DISCONNECT T1 T2 T3 T4 T5 HEAT SINK HEAT SINK HEAT SINK T6 T7 T8 T9 VTERM
1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15
TermPwr Voltage ......................................................................................................... +7V Signal Line Voltage ............................................................................................ 0V to +7V Regulator Output Current ........................................................................................... 1.2A Operating Junction Temperature Plastic (DWP Package) .......................................................................................... 150C Storage Temperature Range ...................................................................... -65C to 150C Lead Temperature (Soldering, 10 seconds) ............................................................. 300C
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.
T H E R MAL DATA
DWP PACKAGE: THERMAL RESISTANCE-JUNCTION TO LEADS, JL THERMAL RESISTANCE-JUNCTION TO AMBIENT, JA 18C/W 40C/W
GND T18 T17 T16 T15 T14 HEAT SINK HEAT SINK HEAT SINK T13 T12 T11 T10 REG OUT
DWP PACKAGE (Top View)
Junction Temperature Calculation: TJ = TA + (PD x JA). The JA numbers are guidelines for the thermal performance of the device/pc-board system. All of the above assume no ambient airflow.
POWER UP / POWER DOWN FUNCTION TABLE
Disconnect L H Open Outputs Enabled HI Z HI Z Quiescent Current 800A 60A 60A
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Copyright (c) 1998 Rev. 1.9 3/98
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LX5202
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R E C O M M E N D E D O P E R AT I N G C O N D I T I O N S Parameter
TermPwr Voltage 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.
(Note 2)
Symbol
VTERM
Recommended Operating Conditions Min. Typ. Max.
4 0 0 4.7 0 5.25 5 VTERM
Units
V V V F C
70
ELECTRICAL CHARACTERISTICS
(Unless otherwise specified, these specifications apply over the operating ambient temperature range of 0C T A 70C. 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 Supply Current Section
TermPwr Supply Current Power Down Mode
Symbol
Test Conditions
Min.
LX5202 Typ. Max.
0.8 390 60 1.5 430 100 120 -23 -23 -23 -23 400
Units
All term lines = Open All term lines = 0.5V Disconnect = Open ITERM = -5mA to -15mA VOUT = 0.5V, T A = 25C VOUT = 0.5V, 0C TA 70C VOUT = 0.5V, V TERM = 4V, TA = 25C VOUT = 0.5V, V TERM = 4V, 0C TA 70C Disconnect = Open, VTERM = 0V to 5.25V Disconnect = Open VOUT = 4V 100 2.7 -20.3 -19.0 -19.5 -18.0
mA mA A V mA mA mA mA nA pF mA V mV mV V mA C V A
Output Section (Terminator Lines)
Terminator Impedance Terminator Output High Voltage Max. Output Current 110 2.9 -21.8 -21.8 -21.8 -21.8 10 6 70 3.6 10 20 0.45 -700 150 0.8 Disconnect = 0V
Output Leakage Output Capacitance Sink Current
58
Regulator Section
Regulator Output Voltage Line Regulation Load Regulation Drop Out Voltage Short Circuit Current Thermal Shutdown VTERM = 4V to 6V I REG = 0 to -100mA IREG = -100mA VREG = 0V 20 50 1.0 -1000
Disconnect Section
Disconnect Threshold Input Current 2.0 40
Copyright (c) 1998 Rev. 1.9 3/98
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LX5202
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BLOCK DIAGRAM
FIGURE 1 -- LX5202 BLOCK DIAGRAM
REG OUT VTERM DISCONNECT VBG T0 VTERM Channel 1 of 18
VTERM
T17
A P P L I C AT I O N S C H E M AT I C
FIGURE 2 -- 8/16-BIT SCSI SYSTEM APPLICATION
5V
4.7F
TERM POWER
VTERM
Narrow
HOST
PERIPHERAL
Narrow
TERM POWER
VTERM
4.7F
5V
DISCONNECT
LX5202
REGOUT
4.7F
LX5202 DB (14) DB (15) DB (P1) DB (14) DB (15) DB (P1)
~~~
REGOUT
4.7F
TERMPWR
VTERM
Wide MSG RST ACK BSY ATN
~~
Wide
VTERM
TERMPWR
DISCONNECT
2.2F
Copyright (c) 1998 Rev. 1.9 3/98
DISCONNECT
SCSI CABLE
MSG RST LX5203 ACK BSY ATN
LX5203
REGOUT
2.2F
~~~
REGOUT
PRODUCTION DATA - Information contained in this document is proprietary to Lin Finity, 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.
4
DISCONNECT
DB (0) DB (1)
~~
DB (0) DB (1)

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