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LIN D O C #: 5203
LX5203
9 - L I N E SCSI ACTIVE TE R M I N AT O R
T
HE
I
NFINITE
P
OWER
OF
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N N O VAT I O N
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RODUCTION
D
ATA
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HEET
DESCRIPTION
The LX5203 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 LX5203 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, error-free communications. During normal operation, the LX5203 consumes only 600A of current. Linfinity's proprietary BiCMOS low dropout regulator architecture enables oscillation-free operation with minimal output capacitance. Linfinity recommends a minimum stabilization capacitor value of 2.2F. The LX5203 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 LX5203 sinks up to 150mA of current making it compatible with today's fast active negation drivers. The LX5203 is a superior, pin-for-pin replacement for a variety of industry products such as the UC5603 and UC5613.
K E Y F E AT U R E S
s 6pF OUTPUT CAPACITANCE DURING DISCONNECT s 60A SUPPLY CURRENT IN DISCONNECT MODE s 600A SUPPLY CURRENT DURING NORMAL OPERATION s 150mA 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: 5203TR
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 LX5203 LX5268
Driver LX5203 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
LX5203CN
DP Plastic SOIC 16-pin, Power
LX5203CDP
Note: All surface-mount packages are available in Tape & Reel. Append the letter "T" to part number. (i.e. LX5203CDPT)
Copyright (c) 1997 Rev. 1.9 7/97
LINFINITY MICROELECTRONICS INC.
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
1
PRODUCT DATABOOK 1996/1997
LX5203
9 - L I N E SCSI A C T I V E TE R M I N AT O R
P
RODUCTION
D
ATA
S
HEET
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
TermPwr Voltage ......................................................................................................... +7V Signal Line Voltage ............................................................................................ 0V to +7V Regulator Output Current ........................................................................................... 0.4A Operating Junction Temperature Plastic (N, DP Packages) ....................................................................................... 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.
T7 T8 T9 N.C. GND DISCONNECT T1 T2
1 2 3 4 5 6 7 8
16 15 14 13 12 11 10 9
T6 T5 REG OUT N.C. N.C. VTERM T4 T3
N PACKAGE (Top View)
T H E R MAL DATA
N PACKAGE: THERMAL RESISTANCE-JUNCTION TO AMBIENT, JA DP PACKAGE: THERMAL RESISTANCE-JUNCTION TO LEADS, JL THERMAL RESISTANCE-JUNCTION TO AMBIENT, JA 20C/W 45C/W 65C/W
T7 T8 T9 HEATSINK/GND GND DISCONNECT T1 T2
16 2 3 4 5 6 7 8 15 14 13 12 11 10 9
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.
T6 T5 REG OUT HEATSINK/GND HEATSINK/GND VTERM T4 T3
DP PACKAGE (Top View)
POWER UP / POWER DOWN FUNCTION TABLE
Disconnect L H Open Outputs Enabled HI Z HI Z Quiescent Current 600A 60A 60A
2
Copyright (c) 1997 Rev. 1.9 7/97
PRODUCT DATABOOK 1996/1997
LX5203
9 - L I N E SCSI ACTIVE TE R M I N AT O R
P
RODUCTION
D
ATA
S
HEET
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 Capacitor on REGOUT Operating Virtual Junction Temperature Range LX5203C Note 2. Range over which the device is functional.
(Note 2)
Symbol
VTERM
Recommended Operating Conditions Min. Typ. Max.
4 0 0 2.2 0 5.25 5 VTERM
Units
V V V F C
125
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.
LX5203 Typ. Max.
0.6 194 60 1.2 208 100 116 120 -23 -23 -23 -23 400
Units
All term lines = Open All term lines = 0.5V Disconnect = Open ITERM = -5mA to -15mA, TA = 25C 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 104 100 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 110 110 2.9 -21.8 -21.8 -21.8 -21.8 10 6 30 3.6 10 20 0.7 -200 150 0.8 Disconnect = 0V
Output Leakage Output Capacitance Sink Current
20
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 -50mA IREG = -50mA VREG = 0V 20 50 1.0 -350
Disconnect Section
Disconnect Threshold Input Current 2.0 40
Copyright (c) 1997 Rev. 1.9 7/97
3
PRODUCT DATABOOK 1996/1997
LX5203
9 - L I N E SCSI A C T I V E TE R M I N AT O R
P
RODUCTION
D
ATA
S
HEET
BLOCK DIAGRAM
FIGURE 1 -- LX5203 BLOCK DIAGRAM
REG OUT VTERM DISCONNECT VBG T0 VTERM Channel 1 of 9
VTERM
T8
A P P L I C AT I O N S C H E M AT I C
FIGURE 2 -- 8-BIT SCSI SYSTEM APPLICATION
5V
2.2F
TERM POWER
VTERM
HOST
PERIPHERAL
TERM POWER
VTERM
2.2F
5V
DISCONNECT
LX5203
REGOUT
2.2F
LX5203 DB (6) DB (7) DB (P) DB (6) DB (7) DB (P)
~~~
REGOUT
2.2F
TERMPWR
VTERM
TERMPWR
DISCONNECT
2.2F
Copyright (c) 1997 Rev. 1.9 7/97
DISCONNECT
ATN BSY ACK RST MSG
VTERM
SCSI CABLE
ATN BSY LX5203 ACK RST MSG
LX5203
REGOUT
2.2F
~~~
~~
REGOUT
Note: Add third LX5203 for 16-bit SCSI
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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