Microsemi Corporation LX5112ACPWP, LX5112ACDP, LX5111ACDP Datasheet
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
1
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.
2
Copyright © 1999
Rev. 0.1 3/99
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