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LIN D O C #: 5205
LX5205
18-LINE PLUG
T
HE
AND
PLAY, POWER SCSI TERMINATOR
D
ATA
I
NFINITE
P
OWER
OF
I
N N O VAT I O N
P
RELIMINARY
S
HEET
DESCRIPTION
The LX5205 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 LX5205 requires a meager 500nA of supply current while offering only 2.5pF of output capacitance. To enter this low power mode, the disconnect pins can be left open (floating) or driven low 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 subsequent reliable, error free communications. The LX5205 has two disconnect pins for SCSI Plug and Play (PnP) applications. During normal operation, the LX5205 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 LX5205 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 finally, the LX5205 sinks up to 100mA of current making it compatible with today's fast active negation drivers. The LX5205 is a superior, pin-for-pin replacement for the UC5607.
K E Y F E AT U R E S
s SCSI PLUG AND PLAY, DUAL LOW DISCONNECT, LOGIC LOW COMMAND DISCONNECTS ALL TERMINATION LINES s 2.5pF OUTPUT CAPACITANCE DURING DISCONNECT s 500nA SUPPLY CURRENT IN DISCONNECT MODE s 800A SUPPLY CURRENT DURING NORMAL OPERATION s 100mA SINK CURRENT FOR ACTIVE NEGATION s LOGIC COMMAND DISCONNECTS ALL TERMINATION LINES s CURRENT LIMIT AND THERMAL PROTECTION s COMPATIBLE WITH SCSI 1, 2, 3, AND FAST-20 STANDARDS s HOT SWAP COMPATIBLE
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 - 20MH Z
D R I V I N G WAV E F O R M - 20MH Z
Receiver
Disconnect 1 Disconnect 2
Driver 1 Meter, AWG 28 LX5205 PnP
Disconnect 1 Disconnect 2
LX5205 PnP
LX5268
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 TA (C) 0 to 70
DWP Plastic SOWB 28-pin, Power
LX5205CDWP
Note: All surface-mount packages are available in Tape & Reel. Append the letter "T" to part number. (i.e. LX5205CDWPT)
Copyright (c) 1998 Rev. 0.7 3/98
LINFINITY MICROELECTRONICS INC.
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
1
PRODUCT DATABOOK 1996/1997
LX5205
18-LINE PLUG
P
AND
PLAY, POWER SCSI TERMINATOR
D
ATA
RELIMINARY
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 ................................................................................... 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 M A L D ATA
DWP PACKAGE: THERMAL RESISTANCE-JUNCTION TO LEADS, JL THERMAL RESISTANCE-JUNCTION TO AMBIENT, JA 18C/W 40C/W
DISCONNECT 1 T1 T2 T3 T4 T5 HEAT SINK/GND GND HEAT SINK/GND 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
DISCONNECT 2 T18 T17 T16 T15 T14 HEAT SINK/GND HEAT SINK/GND HEAT SINK/GND 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 1 H H L L Open Disconnect 2 H L H L Open Outputs Disabled Enabled Enabled Disabled Disabled Quiescent Current 0.5A 800A 800A 80A 0.5A
2
Copyright (c) 1998 Rev. 0.7 3/98
PRODUCT DATABOOK 1996/1997
LX5205
18-LINE PLUG
P
AND
PLAY, POWER SCSI TERMINATOR
D
ATA
RELIMINARY
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 Capacitance on REGOUT Operating Virtual Junction Temperature Range LX5205C 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
125
ELECTRICAL
CHARACTERISTICS
(Unless otherwise specified, these specifications apply over the operating ambient temperature range of 0C TA 70C. Termpwr = 4.75V, DISCONNECT 1 = DISCONNECT 2 = 2.2V. 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.
LX5205 Typ. Max.
0.8 390 0.5 1.5 415 1 120 -23 -23 -23 -23 400
Units
All term lines Open All term lines 0.5V DISCONNECT 1,2 = Open ITERM = -5mA to -15mA VOUT = 0.5V, T A = 25C VOUT = 0.5V, 0C T A 70C VOUT = 0.5V, VTERM = 4V, TA = 25C VOUT = 0.5V, VTERM = 4V DISCONNECT 1,2 = Open, VTERM = 0V to 5.25V DISCONNECT 1,2 = 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 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 2.5 70 3.6 10 20 0.45 -700 150 0.8 Disconnect 1 = Disconnect 2 = 0V Disconnect 1 = Disconnect 2 = 2.2V -28 -25
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 I REG = -100mA VREG = 0V 20 50 1.0 -1000
Disconnect Section
Disconnect Threshold Input Current 2.0
Copyright (c) 1998 Rev. 0.7 3/98
3
PRODUCT DATABOOK 1996/1997
LX5205
18-LINE PLUG
P
AND
PLAY, POWER SCSI TERMINATOR
D
ATA
RELIMINARY
S
HEET
BLOCK DIAGRAM
FIGURE 1 -- LX5205 BLOCK DIAGRAM
REG OUT VTERM DISCONNECT 1 DISCONNECT 2 VBG T0 VTERM Channel 1 of 18
VTERM
T17
A P P L I C A T I O N S C H E M AT I C
FIGURE 2 -- 8-BIT SCSI SYSTEM APPLICATION
5V
4.7F
TERM POWER
VTERM
Narrow
HOST
PERIPHERAL
Narrow
TERM POWER
VTERM
4.7F
5V
PnP DISCONNECT
LX5205
LX5205
REGOUT
4.7F
ACK RST MSG
ACK RST MSG
~~~
REGOUT
4.7F
SCSI CABLE
PRELIMINARY DATA - Information contained in this document is pre-production data, and is proprietary to LinFinity. It may not modified in any way without the express written consent of LinFinity. Product referred to herein is offered in sample form only, and Linfinity reserves the right to change or discontinue this proposed product at any time.
4
Copyright (c) 1998 Rev. 0.7 3/98
PnP DISCONNECT
DB (0) DB (1)
~~
DB (0) DB (1)

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