Microsemi Corporation LX5203CN, LX5203CDP Datasheet
LIN DOC #:
LX5203
9-LINE SCSI ACTIVE TERMINATOR
5203
THE INFINITE POWER OF INNOVATION
DESCRIPTION KEY FEATURES
The LX5203 is a nine-line active terminator
for the SCSI parallel bus. This SCSI standard
recommends active termination at both ends
of the SCSI bus.
During disconnect mode, the LX5203 requires a meager 60µA of supply current,
while offering only 6pF of output capacitance. To enter this low-power mode, the
disconnect pin can be left open (floating) or
driven high, thereby disconnecting the terminating resistors and placing the internal
low dropout regulator into low-power mode.
In disconnect mode each termination line
presents a high impedance to the SCSI bus
with the overall effect being to preserve high
signal integrity and yield subsequent reliable,
error-free communications.
During normal operation, the LX5203 con-
IMPORTANT: For the most current data, consult LinFinity's web site: http://www.linfinity.com.
sumes only 600µA of current. Linfinity's
proprietary BiCMOS low dropout regulator
architecture enables oscillation-free operation with minimal output capacitance.
Linfinity recommends a minimum stabilization capacitor value of 2.2µF.
The LX5203 also offers a precisely trimmed
channel output current specified to a 5%
tolerance. The maximum value of the output
current is trimmed as closely as possible to
the SCSI standard maximum specification to
give the highest possible noise margin for
fast SCSI operation. And the LX5203 sinks
up to 150mA of current making it compatible
with today's fast active negation drivers.
The LX5203 is a superior, pin-for-pin replacement for a variety of industry products
such as the UC5603 and UC5613.
PRODUCT HIGHLIGHT
P RODUCTION DAT A SHEET
■ 6pF OUTPUT CAPACITANCE DURING
DISCONNECT
■ 60µA SUPPLY CURRENT IN DISCON-
NECT MODE
■ 600µA SUPPLY CURRENT DURING
NORMAL OPERATION
■ 150mA SINK CURRENT FOR ACTIVE
NEGATION
■ LOGIC COMMAND DISCONNECTS ALL
TERMINATION LINES
■ CURRENT LIMIT AND THERMAL
PROTECTION
■ COMPATIBLE WITH SCSI 1, 2 AND 3
STANDARDS
■ CONSULT FACTORY FOR APPLICATION
TEST REPORT: 5203TR
RECEIVING WAVEFORM - 5MHZ DRIVING WAVEFORM - 5MHZ
Receiver
1 Meter, AWG 28
LX5203 LX5203
LX5268 LX5268
PACKAGE ORDER INFORMATION
(°C)
T
A
0 to 70 LX5203CN LX5203CDP
Note: All surface-mount packages are available in Tape & Reel.
Append the letter "T" to part number. (i.e. LX5203CDPT)
Plastic DIP
N
16-pin
Driver
Plastic SOIC
DP
16-pin, Power
NOTE:
For An In-Depth
Discussion On Applying
SCSI, Request Linfinity
Application Note:
"Understanding The
Single-Ended SCSI Bus"
Copyright © 1997
Rev. 1.9 7/97
L INFINITY MICROELECTRONICS INC.
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
1
LX5203
PRODUCT DATABOOK 1996/1997
9-LINE SCSI ACTIVE TERMINATOR
P RODUCTION DATA SHEET
ABSOLUTE MAXIMUM RATINGS (Note 1)
TermPwr Voltage ......................................................................................................... +7V
Signal Line Voltage ............................................................................................ 0V to +7V
Regulator Output Current ........................................................................................... 0.4A
Operating Junction Temperature
Plastic (N, DP 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 respect
to Ground. Currents are positive into, negative out of the specified terminal.
THERMAL DATA
N PACKAGE:
THERMAL RESISTANCE-JUNCTION TO AMBIENT,
θθ
θ
θθ
JA
65°C/W
DP PACKAGE:
D
θθ
θ
θθ
JL
x θ
θθ
θ
θθ
JA
).
JA
THERMAL RESISTANCE-JUNCTION TO LEADS,
THERMAL RESISTANCE-JUNCTION TO AMBIENT,
Junction Temperature Calculation: T
numbers are guidelines for the thermal performance of the device/pc-board system.
The θ
JA
All of the above assume no ambient airflow.
= TA + (P
J
20°C/W
45°C/W
POWER UP / POWER DOWN FUNCTION TABLE
Disconnect Outputs
L Enabled 600µA
H HI Z 60µA
Open HI Z 60µA
Quiescent
Current
PACKAGE PIN OUTS
1 16
T7
215
T8
314
T9
413
N.C.
512
GND
DISCONNECT
HEATSINK/GND
GND
DISCONNECT
611
710
T1
89
T2
N PACKAGE
(Top View)
T7
T8
215
T9
314
413
512
611
T1
710
T2
89
DP PACKAGE
(Top View)
16
T6
T5
REG OUT
N.C.
N.C.
V
TERM
T4
T3
T6
T5
REG OUT
HEATSINK/GND
HEATSINK/GND
V
TERM
T4
T3
2
Copyright © 1997
Rev. 1.9 7/97
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