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LIN D O C #: 5115
UltraMAX
T
HE
TM
LX5115
D
ATA
U LT R A 9 - CHANNEL S C S I TE R M I N ATOR
I
NFINITE
P
OWER
OF
I
N N O VAT I O N
P
RODUCTION
S
HEET
DESCRIPTION
The LX5115 SCSI terminator is part of Linfinity's UltraMAX family of high-performance, adaptive, non-linear mode SCSI products, which are designed to deliver true UltraSCSI performance in SCSI applications. The low voltage BiCMOS architecture employed in its design offers superior performance to older linear passive and active techniques. Linfinity's UltraMAX architecture employs high-speed adaptive elements for each channel, thereby providing the fastest response possible -- typically 35MHz, which is 100 times faster than the older linear regulator/terminator approach used by other manufacturers. Products using this older linear regulator approach have bandwidths which are dominated by the output capacitor and which are limited to 500KHz (see further discussion in the Functional Description section). The UltraMAX architecture also eliminates the output compensation capacitor typical in earlier terminator designs. Each is approved for use with SCSI-1, -2, -3, UltraSCSI and beyond -- providing the highest performance alternative available today. Another key improvement offered by the LX5115 lies in its ability to insure reliable, errorfree communications even in systems which do not adhere to recommended SCSI hardware design guidelines, such as the use of improper cable lengths and impedances. Frequently, this situation is not controlled by the peripheral or host designer and, when problems occur, they are the first to be made aware of the problem. The LX5115 architecture is much more tolerant of marginal system integrations. Recognizing the needs of portable and configurable peripherals, the LX5115 has a TTL compatible sleep/disable mode. Quiescent current is typically 150A in this mode, while the output capacitance is also less than 3pF. The obvious advantage of extended battery life for portable systems is inherent in the product's sleepmode feature. Additionally, the disable function permits factory-floor or production-line configurability, reducing inventory and productline diversity costs. Field configurability can also be accomplished without physically removing components which, often times results in field returns due to mishandling. Reduced component counts is also inherent in the LX5115 architecture. Traditional termination techniques require large stabilization and transient protection capacitors of up to 20F in value and size. The LX5115 architecture does not require these components, allowing all the cost savings associated with inventory, board space, assembly, reliability, and component costs.
K E Y F E AT U R E S
s ULTRA-FAST RESPONSE FOR FAST-20 SCSI APPLICATIONS s 35MHz CHANNEL BANDWIDTH s LESS THAN 3pF OUTPUT CAPACITANCE s SLEEP-MODE CURRENT OF 150A s NO EXTERNAL COMPENSATION CAPACITORS s IMPLEMENTS 8-BIT OR 16-BIT (WIDE) APPLICATIONS s COMPATIBLE WITH ACTIVE NEGATION DRIVERS (37mA / CHANNEL) s COMPATIBLE WITH PASSIVE AND ACTIVE TERMINATIONS s APPROVED FOR USE WITH SCSI 1, 2, 3 AND ULTRA SCSI s HOT SWAP COMPATIBLE s PIN-FOR-PIN COMPATIBLE WITH DS21S07A / 2105
NOTE: For current data & package dimensions, visit our web site: http://www.linfinity.com.
PRODUCT HIGHLIGHT
R E C E I V I N G W AV E F O R M - 2 0 M HZ
D R I V I N G WAV E F O R M - 2 0 M HZ
Receiver 1 Meter, AWG 28 LX5115 LX5268
Driver LX5115 LX5268
NOTE:
For An In-Depth Discussion On Applying SCSI, Request Linfinity Application Note: "Understanding The SingleEnded SCSI Bus"
PA C K A G E O R D E R I N F O R M AT I O N TJ (C) 0 to 70
D Plastic SOIC 16-pin
LX5115CD
DW Plastic SOWB 16-pin
LX5115CDW
PWP Plastic TSSOP 20-pin, Power
LX5115CPWP
Note: All surface-mount packages are available in Tape & Reel. Append the letter "T" to part number. (i.e. LX5115CDWT)
Copyright (c) 1997 Rev. 1.1 12/97
LINFINITY MICROELECTRONICS INC.
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
1
PRODUCT DATABOOK 1996/1997
LX5115
U LT R A 9 - CHANNEL S C S I TE R M I N ATOR
P
RODUCTION
UltraMAX
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)
PA C K A G E P I N O U T S
TERM POWER D0 D1 D2 D3 D4 N.C. GND
16 2 3 4 5 6 7 8 15 14 13 12 11 10 9
Continuous Termination Voltage .......................................................................... 10V Continuous Output Voltage Range .............................................................. 0 to 5.5V Continuous Disable Voltage Range .............................................................. 0 to 5.5V Operating Junction Temperature ........................................................... 0C to 125C Storage Temperature Range ............................................................. -65C to +150C Solder Temperature (Soldering, 10 seconds) ................................................... 300C
Note 1. Exceeding these ratings could cause damage to the device.
DISABLE N.C. D8 D7 D6 D5 N.C. N.C.
T H E R MAL DATA
D PACKAGE: THERMAL RESISTANCE-JUNCTION TO AMBIENT, JA DW PACKAGE: THERMAL RESISTANCE-JUNCTION TO AMBIENT, JA PWP PACKAGE: THERMAL RESISTANCE-JUNCTION TO AMBIENT, JA 139C/W 95C/W 120C/W
TERM POWER D0 D1 D2 D3 D4 N.C. GND
D PACKAGE (Top View)
1 2 3 4 5 6 7 8
16 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.
DISABLE N.C. N.C. D8 D7 D6 D5 N.C.
DW PACKAGE (Top View)
TERM POWER HEATSINK/GND D0 D1 D2 D3 D4 HEATSINK/GND N.C. GND
20 2 3 4 5 6 7 8 9 10 19 18 17 16 15 14 13 12 11
DISABLE N.C. HEATSINK/GND N.C. D8 D7 D6 D5 HEATSINK/GND N.C.
PWP PACKAGE (Top View)
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Copyright (c) 1997 Rev. 1.1 12/97
PRODUCT DATABOOK 1996/1997
UltraMAX
U LT R A 9 - CHANNEL S C S I TE R M I N ATOR
P
RODUCTION
LX5115
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
Termination Voltage High Level Enable Input Voltage Low Level Disable Input Voltage Operating Virtual Junction Temperature Range LX5115C Note 2. Range over which the device is functional.
(Note 2)
Symbol
VTERM VIH VIL
Recommended Operating Conditions Min. Typ. Max.
4.0 2 0 0 5.5 VTERM 0.8 125
Units
V V V C
ELECTRICAL CHARACTERISTICS
Term Power = 4.75V unless otherwise specified. Unless otherwise specified, these specifications apply at the recommended operating ambient temperature of TA = 25C. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient temperature.
Parameter
Output High Voltage TermPwr Supply Current
Symbol
VOUT ICC
Test Conditions
Min.
2.65
LX5115 Typ. Max.
2.85 5.5 210 150 -23 10 -15 20 3 35 37 9 225 -24
Units
V mA mA A mA nA A nA pF MHz mA
Output Current Disable Input Current Output Leakage Current Capacitance in Disabled Mode Channel Bandwidth Termination Sink Current, per Channel
IOUT IIN IOL COUT BW I SINK
All data lines = open All data lines = 0.5V Disable Pin < 0.8V VOUT = 0.5V Disable Pin = 4.75V Disable Pin = 0V Disable Pin = < 0.8V, VO = 0.5V VOUT = 0V, frequency = 1MHz VOUT = 4V
-21
Copyright (c) 1997 Rev. 1.1 12/97
3
PRODUCT DATABOOK 1996/1997
LX5115
U LT R A 9 - CHANNEL S C S I TE R M I N ATOR
P
RODUCTION
UltraMAX
D
ATA
S
HEET
BLOCK DIAGRAM
TERM POWER
THERMAL LIMITING CIRCUIT
CURRENT BIASING CIRCUIT
24mA CURRENT LIMITING CIRCUIT
DATA OUTPUT PIN DB(0)
2.85V
DISABLE PIN 1.4V 1 OF 9 CHANNELS
FUNCTIONAL DESCRIPTION
by delivering 24mA on assertion and by imposing 2.85V on Cable transmission theory suggests to optimize signal speed deassertion. In order to disable the device, the Disable pin and quality, the termination should act both as an ideal voltage must be driven logic Low. This mode of operation places reference when the line is released (deasserted) and as an the device in a sleep state where a meager 150A of quiescent ideal current source when the line is active (asserted). Common current is consumed. Additionally, all active terminators, which consist of Linear Regulators in series with resisPOWER UP / POWER DOWN FUNCTION TABLE outputs are in a Hi-Z (impedance) state. Sleep mode can be used for tors (typically 110), are a compropower conservation or to completely mise. As the line voltage increases, Disable Quiescent Outputs eliminate the terminator from the SCSI the amount of current decreases linLX5115 Current chain. In the second case, termination early by the equation V = I * R. The H Enabled 5.5mA node capacitance is important to LX5115, with its unique new architecL HI Z 150A consider. The terminator will appear ture applies the maximum amount of as a parasitic distributed capacitance current regardless of line voltage until Open Enabled 5.5mA on the line, which can detract from bus the termination high threshold (2.85V) performance. For this reason, the is reached. LX5115 has been optimized to have only 3pF of capacitance Acting as a near ideal line terminator, the LX5115 closely per output in the sleep state. reproduces the optimum case when the device is enabled. An additional feature of the LX5115 is its compatibility with To enable the device the Disable Pin must be pulled Logic active negation drivers. The device handles up to 37mA of High or left open. During this mode of operation, quiescent sink current for drivers which exceed the 2.85V output high. current is 5.5mA and the device will respond to line demands
UltraMAX is a trademark of Linfinity Microelectronics Inc.
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.
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Copyright (c) 1997 Rev. 1.1 12/97

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