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LIN D O C #: 5111
UltraMAX
T
HE
TM
LX5111/5112
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 LX5111/5112 SCSI terminators are 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 their 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 LX5111/5112 lies in their ability to insure reliable, error-free 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 LX5111/5112 architecture is much more tolerant of marginal system integrations. Recognizing the needs of portable and configurable peripherals, the LX5111/5112 have a TTL compatible sleep/disable mode. Quiescent current is typically less than 275A 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 sleep-mode 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 LX5111/5112's architecture. Traditional termination techniques require large stabilization and transient protection capacitors of up to 20F in value and size. The LX5111/5112 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 3.3V OPERATION s LESS THAN 3pF OUTPUT CAPACITANCE s SLEEP-MODE CURRENT LESS THAN 275A s THERMALLY SELF LIMITING s NO EXTERNAL COMPENSATION CAPACITORS s IMPLEMENTS 8-BIT OR 16-BIT (WIDE) APPLICATIONS s COMPATIBLE WITH ACTIVE NEGATION DRIVERS (60mA / 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 LX5211 AND UC5606 (LX5111) s PIN-FOR-PIN COMPATIBLE WITH LX5212 AND UC5603/5613/5614 (LX5112)
IMPORTANT: For the most current data, consult LinFinity's 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 LX5111/5112 LX5268
Driver
NOTE:
LX5111/5112
LX5268
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
For An In-Depth Discussion On Applying SCSI, Request Linfinity Application Note: "Understanding The SingleEnded SCSI Bus"
DP Plastic SOIC 16-pin, Power
LX5111CDP LX5112CDP
PWP Plastic TSSOP 24-pin, Power
LX5111CPWP LX5112CPWP
Note: All surface-mount packages are available in Tape & Reel. Append the letter "T" to part number. (i.e. LX5111CDPT)
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
LX5111/5112
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)
PACKAGE PIN OUTS
T7 T8 T9 HEATSINK/GND GND DISCONNECT * T1 T2
1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9
TermPwr Voltage ................................................................................................. +7V Signal Line Voltage ................................................................................... 0V to +7V Regulator Output Current ................................................................................... 0.4A Operating Junction Temperature Plastic (DP, PWP 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.
T6 T5 N.C. HEATSINK/GND HEATSINK/GND VTERM T4 T3
DP PACKAGE (Top View)
T H E R MAL DATA
DP PACKAGE: THERMAL RESISTANCE-JUNCTION TO LEADS, JL THERMAL RESISTANCE-JUNCTION TO AMBIENT, JA PWP PACKAGE: THERMAL RESISTANCE-JUNCTION TO LEADS, JL THERMAL RESISTANCE-JUNCTION TO AMBIENT, JA 27C/W 100C/W 20C/W 50C/W
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.
T7 T8 T9 N.C. GND HEATSINK/GND HEATSINK/GND HEATSINK/GND HEATSINK/GND DISCONNECT * T1 T2
1 2 3 4 5 6 7 8 9 10 11 12
24 23 22 21 20 19 18 17 16 15 14 13
T6 T5 N.C. N.C. HEATSINK/GND HEATSINK/GND HEATSINK/GND HEATSINK/GND N.C. VTERM T4 T3
PWP PACKAGE (Top View)
* Pin 10 is DISCONNECT for the LX5112, and DISCONNECT for the LX5111.
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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
LX5111/5112
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 LX5111C/5112C Note 2. Range over which the device is functional.
(Note 2)
Symbol
VTERM VIH VIL
Recommended Operating Conditions Min. Typ. Max.
3.3 2 0 0 2 0 5.5 VTERM 0.8 0.8 VTERM 125
Units
V V V V V C
LX5111 LX5112 LX5111 LX5112
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 LX5111 LX5112 Output Current DISCONNECT Input Current DISCONNECT Input Current Output Leakage Current LX5111 LX5112
Symbol
VOUT ICC
Test Conditions
LX5111/5112 Min. Typ. Max.
2.65 2.82 5 205 275 275 -23 10 40 -14 10 10 10 3 35 35 9 225
Units
V mA mA A A mA nA A A nA nA nA pF MHz mA
IOUT IIN IIN I OL COUT BW I SINK
LX5111 LX5112 Capacitance in DISCONNECT Mode Channel Bandwidth Termination Sink Current, per Channel
All data lines = open All data lines = 0.5V DISCONNECT Pin < 0.8V DISCONNECT Pin > 2.0V VOUT = 0.5V DISCONNECT Pin = 4.75V DISCONNECT Pin = 0V DISCONNECT Pin = 0V DISCONNECT Pin = 4.75V DISCONNECT Pin = < 0.8V, V O = 0.5V DISCONNECT Pin = > 2.0V, V O = 0.5V VOUT = 0V, frequency = 1MHz VOUT = 4V
-21
-24
Copyright (c) 1997 Rev. 1.1 12/97
3
PRODUCT DATABOOK 1996/1997
LX5111/5112
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
DISCONNECT (5111) DISCONNECT (5112)
1.4V 1 OF 9 CHANNELS
FUNCTIONAL DESCRIPTION Cable transmission theory suggests to optimize signal speed 2.85V on deassertion. In order to disable the device, the and quality, the termination should act both as an ideal voltage DISCONNECT pin (DISCONNECT pin for the LX5112) must be reference when the line is released (deasserted) and as an ideal driven logic Low (logic High for the LX5112). This mode of current source when the line is active (asserted). Common operation places the devices in a sleep state where a meager active terminators, which consist of Linear Regulators in series 275A of quiescent current is consumed. Additionally, all outputs with resistors (typically 110), are are in a Hi-Z (impedance) state. POWER UP / POWER DOWN FUNCTION TABLE a compromise. As the line voltage Sleep mode can be used for power increases, the amount of current LX5111 LX5112 Quiescent conservation or to completely elimiOutputs decreases linearly by the equation nate the terminator from the SCSI DISCONNECT DISCONNECT Current V = I * R. The LX5111/5112, with chain. In the second case, termitheir unique new architecture apnation node capacitance is imporH L Enabled 6mA plies the maximum amount of tant to consider. The terminators L H HI Z 275A current regardless of line voltage will appear as a parasitic distributed Open Open HI Z 275A until the termination high threshold capacitance on the line, which can (2.85V) is reached. detract from bus performance. For Acting as a near ideal line terminators, the LX5111/5112 this reason, the LX5111/5112 have been optimized to have only closely reproduce the optimum case when the devices are 3pF of capacitance per output in the sleep state. enabled. To enable the device the DISCONNECT pin An additional feature of the LX5111/5112 IC's are their (DISCONNECT pin for the LX5112) must be pulled logic High compatibility with active negation drivers. These devices handle (logic Low for the LX5112). During this mode of operation, up to 60mA of sink current for drivers which exceed the 2.85V quiescent current is 6mA and the devices will respond to line output high. demands by delivering 24mA on assertion, and by imposing
UltraMAX is a trademark of Linfinity Microelectronics Inc.
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.
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Copyright (c) 1997 Rev. 1.1 12/97

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