ETC LX5119CDB

UltraMAX
TM
LX5119
ULTRA 27-L I N E SCSI T E R M I N AT O R
T
H E
I
N F I N I T E
P
O W E R
O F
I
P
N N O VA T I O N
R O D U C T I O N
DESCRIPTION
The LX5119 UltraMAXTM terminator represents
next-generation technology for SCSI termination applications. The low-voltage BiCMOS
architecture employed in its design offers
superior performance to older passive and
active techniques.
Linfinity's architecture employs high-speed
adaptive elements for each channel, providing
the fastest response possible. The channel
bandwidth is typically 35MHz. The LX5119
compares favorably to older linear regulator
approaches whose bandwidth's are dominated by the output compensation capacitor
and are limited to the 500KHz bandwidth
region (see further discussion in the Functional Description section). Linfinity's architecture also eliminates the output compensation capacitor typical in earlier terminator
designs. Each is approved for use with SCSI1,-2,-3, ULTRA and beyond — providing the
highest performance alternative available today.
Another key improvement of LX5119 products lies in their ability to ensure reliable, errorfree communications even in systems which
D
A T A
S
H E E T
K E Y F E AT U R E S
do not necessarily 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 these problems. The
LX5119 architecture is much more tolerant
of marginal system integrations.
Recognizing the needs of portable and
configurable peripherals, the LX5119 has a
TTL compatible sleep/disable mode. To
enter this mode, the DIS pin must be driven
low, thereby disconnecting the LX5119 from
the SCSI bus. Quiescent current is less than
150µA in this mode.
Reduced component count is also inherent
in the LX5119 architecture. Traditional termination techniques require large stabilization and transient protection capacitors of up
to 20µF in value and size. The LX5119
architecture does not require these components, allowing all the cost savings associated
with inventory, board space, assembly, reliability, and component costs.
■ Ultra-Fast Response For Fast-20 SCSI
Applications
■ Split Disconnect For Mixing 16-Bit
(Wide) Or 8-Bit (Narrow) Buses
■ 35mhz Channel Bandwidth
■ Sleep-Mode Current Less Than 150µA
■ Hot-Swap Compatible
■ NO External Compensation Capacitors
■ Compatible With Active Negation
Drivers
■ Superior Pin-for-Pin Replacement For
The UCC5619
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 - 20MH Z
D R I V I N G W AV E F O R M - 20MH Z
Receiver
Driver
1 Meter, AWG 28
LX5119
LX5119
LX5268
LX5268
PA C K A G E O R D E R I N F O
TJ (°C)
0 to 125
SSOP
DB Plastic
36-pin
NOTE:
For An In-Depth
Discussion On Applying
SCSI, Request Linfinity
Application Note:
"Understanding The
Single-Ended SCSI Bus"
LX5119CDB
Note: Available in Tape & Reel.
Append the letter "T" to part number. (i.e. LX5119CDBT)
Copyright © 2000
Rev. 1.0 4/00
LINFINITY MICROELECTRONICS INC.
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
1
PRODUCT DATABOOK 1996/1997
UltraMAX
LX5119
ULTRA 27-L INE , P LUG
P
AND
D
R O D U C T I O N
A B S O L U T E M A X I M U M R AT I N G S
P LAY SCSI T ERMINATOR
A T A
S
H E E T
PA C K A G E P I N O U T S
(Note 1)
TermPwr Voltage ..................................................................................................... 7V
Continuous Output Voltage Range .............................................................. 0 to 5.5V
Continuous Disable Voltage Range .............................................................. 0 to 5.5V
Operating Junction Temperature
Plastic (DB Packages) .................................................................................... 150ºC
Storage Temperature Range ............................................................. -65°C to +150°C
Solder Temperature (Soldering, 10 seconds) ................................................... 300°C
T19
T20
T1
T2
T3
T4
T5
GND
GND
GND
DIS
T6
T7
T8
T9
T10
T21
T22
Note 1. Exceeding these ratings could cause damage to the device.
T H E R M A L D ATA
DB PACKAGE:
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
50°C/W
Junction Temperature Calculation: TJ = TA + (PD x θJA).
The θJA numbers are guidelines for the thermal performance of the device/pc-board
system. All of the above assume no ambient airflow.
Symbol
Termination Voltage
High Level Disable Input Voltage
Low Level Disable Input Voltage
Operating Virtual Junction Temperature Range
LX5119C
VTERM
VIH
VIL
36
2
35
3
34
4
33
5
32
6
31
7
30
8
29
9
28
10
27
11
26
12
25
13
24
14
23
15
22
16
21
17
20
18
19
T27
T26
T25
T18
T17
T16
T15
N.C.
GND
GND
GND
VT
T14
T13
T12
T11
T24
T23
DB PACKAGE
(Top View)
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
1
(Note 2)
Recommended Operating Conditions
Min.
Typ.
Max.
Units
4.0
2
0
5.5
VTERM
0.8
V
V
V
0
125
°C
Note 2. Range over which the device is functional.
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
2
Symbol
Output High Voltage
TermPwr Supply Current
VOUT
ICC
Output Current
Disable Input Current
Output Leakage Current
Channel Bandwidth
Termination Sink Current, per Channel
IOUT
IIN
BW
ISINK
Test Conditions
Min.
2.65
All data lines = open
All data lines = 0.2V
DIS (Disable) Pin < 0.8V
VOUT = 0.2V
DIS = 0V
DIS < 0.8V, VO = 0.2V
-20
LX5119
Typ.
Max.
2.85
12
635
10
-23
35
VOUT = 4V
7
20
670
150
-24
-10
1
Units
V
mA
mA
µA
mA
µA
µA
MHz
mA
Copyright © 2000
Rev. 1.0 4/00
PRODUCT DATABOOK 1996/1997
UltraMAX
LX5119
ULTRA 27-L INE , P LUG
P
AND
R O D U C T I O N
P LAY SCSI T ERMINATOR
D
A T A
S
H E E T
BLOCK DIAGRAM
TERM POWER
CURRENT
BIASING
CIRCUIT
24mA CURRENT
LIMITING CIRCUIT
DATA OUTPUT
PIN DB(0)
2.85V
DIS
1.4V
1 OF 27 CHANNELS
FUNCTIONAL DESCRIPTION
Cable transmission theory suggests that in order to optimize
reproduces the optimum case when the device is enabled. To
signal speed and quality, the termination should act both as
enable the device the DIS (Disable) pin should be driven high
an ideal voltage reference when the line is released (de-asserted)
or left open. During this mode of operation, quiescent current
and as an ideal current source when
is 20mA (Max.) and the device will
POWER UP / POWER DOWN FUNCTION TABLE respond to line demands by delivering
the line is active (asserted). Common
active terminators, which consist of
24mA on assertion and by imposing
Disable
Quiescent
Linear Regulators in series with resis2.85V on de-assertion. Disable mode
Outputs
LX5119
Current
tors (typically 110Ω), are a comproplaces the device in a sleep state, where
mise. As the line voltage increases,
a meager 150µA (Max.) of quiescent
L
HI Z
150µA (Max.)
the amount of current decreases lincurrent is consumed. Additionally, all
H
Enabled
20mA (Max.)
early by the equation V = I * R. The
outputs are in a Hi-Z (impedance) state.
Open
Enabled
20mA (Max.)
UltraMAX LX5119, with its unique new
Sleep mode can be used for power
architecture, applies the maximum
conservation or to completely eliminate
amount of current regardless of line
the terminator from the SCSI chain.
voltage until the termination high threshold (2.85V) is reached.
An additional feature of the LX5119 is its compatibility with
Acting as a near ideal line terminator, the LX5119 closely
active negation drivers.
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.
Copyright © 2000
Rev. 1.0 4/00
3