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LIN DOC #:
51115
UltraMAX
ULTRA 9-CHANNEL SCSI TERMINATOR
T HE I NFINITE P OWER OF I NNOVATION
DESCRIPTION KEY FEATURES
The LX5111A/5112A 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
LX5111A/12A 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
IMPORTANT: For the most current data, consult LinFinity's web site: http://www.linfinity.com.
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
LX5111A/12A architecture is much more tolerant
of marginal system integrations.
Recognizing the needs of portable and
configurable peripherals, the LX5111A/12A have
a TTL compatible sleep/disable mode. Quiescent
current is typically less than 275µA 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 LX5111A/12A's architecture. Traditional termination techniques require large stabilization and
transient protection capacitors of up to 20µF in
value and size. The LX5111A/12A architecture
does not require these components, allowing all
the cost savings associated with inventory, board
space, assembly, reliability, and component costs.
P RELIMINARY DATA SHEET
TM
LX5111A/5112A
■ Ultra-Fast Response For FAST-20 SCSI
Applications
■ 35MHz Channel Bandwidth
■ 3.0V Operation
■ Less Than 3pF Output Capacitance
■ Thermally Self-Limiting
■ NO External Compensation Capacitors
■ Implements 8-bit Or 16-bit (
Applications
■ Compatible with Active Negation
Drivers
■ Compatible With Passive And Active
Terminations
■ Approved For Use With SCSI 1, 2, 3
And Ultra SCSI
■ Hot-Swap Compatible
■ Pin-For-Pin Compatible With
LX5211 and UC5606 (LX5111)
■ Pin-For-Pin Compatible With
LX5212 And UC5603/5613/5614
(LX5112)
Wide
)
PRODUCT HIGHLIGHT
Receiver
1 Meter, AWG 28
LX5111A/5112A
LX5268 LX5268
PACKAGE ORDER INFORMATION
T
(°C)
A
0 to 70
Note: All surface-mount packages are available in Tape & Reel.
Append the letter "T" to part number. (i.e. LX5111ACDPT)
Plastic SOIC
DP
16-pin, Power
PWP
LX5111ACDP LX5111ACPWP
LX5112ACDP LX5112ACPWP
DRIVING WAVEFORM - 20MHZRECEIVING WAVEFORM - 20MHZ
Driver
LX5111A/5112A
Plastic TSSOP
24-pin, Power
NOTE:
For An In-Depth
Discussion On Applying
SCSI, Request Linfinity
Application Note:
"Understanding The Single-
Ended SCSI Bus"
Copyright © 1999
Rev. 0.1 3/99
L INF INITY MICROELECTRONICS INC.
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
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PRODUCT DATABOOK 1996/1997
LX5111A/5112A
ULTRA 9-CHANNEL SCSI TERMINATOR
RELIMINARY DATA SHEET
P
ABSOLUTE MAXIMUM RATINGS (Note 1)
TermPwr Voltage .................................................................................................+7V
Signal Line Voltage ................................................................................... 0V to +7V
Regulator Output Current ................................................................................... 0.4A
Operating Junction Temperature
Plastic (DP, PWP Packages) ........................................................................ 150°C
Storage Temperature Range .............................................................. -65°C to 150°C
Lead Temperature (Soldering, 10 seconds) .................................................... 300°C
Note 1. Exceeding these ratings could cause damage to the device. All voltages are with
DP PACKAGE:
PWP PACKAGE:
Junction Temperature Calculation: TJ = TA + (P
The θ
system. All of the above assume no ambient airflow.
respect to Ground. Currents are positive into, negative out of the specified
terminal.
THERMAL DATA
D
θθ
θ
θθ
JL
θθ
θ
θθ
JL
x θ
θθ
θ
θθ
JA
θθ
θ
θθ
JA
).
JA
THERMAL RESISTANCE-JUNCTION TO LEADS,
THERMAL RESISTANCE-JUNCTION TO AMBIENT,
THERMAL RESISTANCE-JUNCTION TO LEADS,
THERMAL RESISTANCE-JUNCTION TO AMBIENT,
numbers are guidelines for the thermal performance of the device/pc-board
JA
20°C/W
50°C/W
27°C/W
100°C/W
PACKAGE PIN OUTS
HEATSINK/GND
DISCONNECT *
T7
T8
T9
N.C.
GND
HEATSINK/GND
HEATSINK/GND
HEATSINK/GND
HEATSINK/GND
DISCONNECT *
T1
T2
UltraMAX
T7
1 16
T8
215
T9
314
GND
413
512
611
T1
710
T2
89
DP PACKAGE
(Top View)
1 24
223
322
421
520
619
718
817
916
10 15
11 14
12 13
PWP PACKAGE
(Top View)
T6
T5
N.C.
HEATSINK/GND
HEATSINK/GND
V
TERM
T4
T3
T6
T5
N.C.
N.C.
HEATSINK/GND
HEATSINK/GND
HEATSINK/GND
HEATSINK/GND
N.C.
V
TERM
T4
T3
* Pin 10 is DISCONNECT for the LX5112A,
and DISCONNECT for the LX5111A.
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Copyright © 1999
Rev. 0.1 3/99
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PRODUCT DATABOOK 1996/1997
UltraMAX
LX5111A/5112A
ULTRA 9-CHANNEL SCSI TERMINATOR
P RELIMINARY DATA SHEET
RECOMMENDED OPERATING CONDITIONS (Note 2)
Parameter
Termination Voltage V
High Level Enable Input Voltage LX5111A V
LX5112A
Low Level Disable Input Voltage LX5111A V
LX5112A
Operating Virtual Junction Temperature Range
LX5111AC/5112AC
Note 2. Range over which the device is functional.
Symbol
TERM
IH
IL
ELECTRICAL CHARACTERISTICS
Term Power = 4.75V unless otherwise specified. Unless otherwise specified, these specifications apply at the recommended operating ambient temperature of TA = 25°C. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient temperature.
Parameter
Output High Voltage V
TermPwr Supply Current I
LX5111A DISCONNECT Pin < 0.8V
LX5112A DISCONNECT Pin > 2.0V
Output Current I
DISCONNECT Input Current LX5111A I
DISCONNECT Input Current LX5112A I
Output Leakage Current LX5111A I
LX5112A DISCONNECT Pin = > 2.0V, VO = 0.5V
Capacitance in DISCONNECT Mode C
Channel Bandwidth BW
Termination Sink Current, per Channel I
Symbol
OUT
CC
OUTVOUT
IN
IN
OL
OUTVOUT
SINKVOUT
Test Conditions Units
Term Power = 4.75V
Term Power = 3.0V
All data lines = open
All data lines = 0.5V
= 0.5V, Term Power = 4.75V
V
= 0.5V, Term Power = 3.0V
OUT
DISCONNECT Pin = 4.75V
DISCONNECT Pin = 0V
DISCONNECT Pin = 0V
DISCONNECT Pin = 4.75V
DISCONNECT Pin = < 0.8V, VO = 0.5V
= 0V, frequency = 1MHz
= 4V
Recommended Operating Conditions
Min. Typ. Max.
3.0 5.5 V
2.5 V
0 0.8 V
0 0.8 V
2.5 V
0 125 °C
TERM
TERM
LX5111A/5112A
Min. Typ. Max.
2.65 2.82 V
2.1 2.2 V
59mA
205 225 mA
275 µA
275 µA
-21 -23 -24 mA
-17 -18 mA
10 nA
40 µA
-14 µA
10 nA
10 nA
10 nA
3pF
35 MHz
711 mA
Units
V
V
Copyright © 1999
Rev. 0.1 3/99
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PRODUCT DATABOOK 1996/1997
T
LX5111A/5112A
TERM POWER
DISCONNECT (5111)
DISCONNECT (5112)
1.4V
ULTRA 9-CHANNEL SCSI TERMINATOR
RELIMINARY DATA SHEET
P
BLOCK DIAGRAM
CURRENT
BIASING
CIRCUIT
24mA CURRENT
LIMITING CIRCUIT
UltraMAX
DATA OUTPU
PIN DB(0)
2.85V
1 OF 9 CHANNELS
FUNCTIONAL DESCRIPTION
Cable transmission theory suggests to optimize signal speed
and quality, the termination should act both as an ideal voltage
reference when the line is released (deasserted) and as an ideal
current source when the line is active (asserted). Common
active terminators, which consist of Linear Regulators in series
with resistors (typically 110Ω), are
a compromise. As the line voltage
increases, the amount of current
decreases linearly by the equation
V = I * R. The LX5111A/5112A, with
their unique new architecture applies the maximum amount of
current regardless of line voltage
until the termination high threshold
POWER UP / POWER DOWN FUNCTION TABLE
LX5111A LX5112A
DISCONNECT DISCONNECT
H L Enabled 6mA
L H HI Z 275µA
Open Open HI Z 275µA
(2.85V) is reached.
Acting as a near ideal line terminators, the LX5111A/5112A
closely reproduce the optimum case when the devices are
enabled. To enable the device the DISCONNECT pin
(DISCONNECT pin for the LX5112A) must be pulled logic High
(logic Low for the LX5112A). During this mode of operation,
quiescent current is 6mA and the devices will respond to line
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.
UltraMAX is a trademark of Linfinity Microelectronics Inc.
demands by delivering 24mA on assertion, and by imposing
2.85V on deassertion. In order to disable the device, the
DISCONNECT pin (DISCONNECT pin for the LX5112A) must
be driven logic Low (logic High for the LX5112A). This mode
of operation places the devices in a sleep state where a meager
275µA of quiescent current is consumed. Additionally, all outputs are
Outputs
Quiescent
Current
in a Hi-Z (impedance) state. Sleep
mode can be used for power conservation or to completely eliminate
the terminator from the SCSI chain.
In the second case, termination
node capacitance is important to
consider. The terminators will ap-
pear as a parasitic distributed capacitance on the line, which can detract from bus performance. For
this reason, the LX5111A/5112A have been optimized to have
only 3pF of capacitance per output in the sleep state.
An additional feature of the LX5111A/5112A IC's are their
compatibility with active negation drivers.
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Copyright © 1999
Rev. 0.1 3/99
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