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LX5251CPW

P1-P3P4-P6P7-P8
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
Copyright © 2002
Rev. 1.1, 2006-02-27
WWW.Microsemi .COM
LX5251
9-Line Multimode SCSI Terminator
P
R
ODUCTION
DATA SHEET
TM
®
DESCRIPTION
The LX5251 is a multimode SCSI
terminator that is compatible with the
SCSI SPI-2 (Ultra2), SCSI SPI-3 (Ultra3
or Ultra160), and SCSI SPI-4 (Ultra320)
specifications developed by the T10
standards committee for low voltage
differential (LVD) termination, while
providing backwards compatibility to the
SCSI, SCSI-2, and SPI single-ended
specifications. Multimode compatibility
permits the use of legacy devices on the
bus without hardware alterations.
Automatic mode selection is achieved
through voltage detection on the
Diffsense line.
The LX5251 utilizes an industry
standard LVD architecture. The
individual high bandwidth drivers
maximize channel separation, reduce
channel-to-channel noise and cross talk
to insure Ultra320 performance.
When the LX5251 is enabled, the
differential sense (DIFFSENSE) pin
supplies a voltage between 1.2V and
1.4V. In
application, this pin is tied to the DIFFSENSE
input of the corresponding LVD transceivers.
This action enables the LVD transceiver
function. DIFFSENSE is capable of supplying
a maximum of 15mA.
Tying the DIFFSENSE pin high places the
LX5251 in a HI-Z state indicating the presence
of an HVD device. Tying the pin low places
the part in a single-ended mode while also
signaling the multimode transceiver to operate
in a single-ended mode.
Recognizing the needs of portable and
configurable peripherals, the LX5251 has a
TTL compatible sleep/disable mode. During
this sleep/disable mode, power dissipation is
reduced to a meager 15uA while also placing
all outputs in a HI-Z state. Also during
sleep/disable mode, the DIFFSENSE function
is disabled and is placed in a HI-Z state.
The LX5251 also provides a master / slave
function. Driving this pin high or floating the
pin enables the 1.3V DIFFSENSE reference.
Driving the pin low disables the on board
DIFFSENSE reference and enables use of an
external master reference device.
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
KEY FEATURES
Compliant with SCSI SPI-2
(Ultra2), SPI-3 (Ultra160), and
SPI-4 (Ultra320)
Auto-Selectable LVD or Single-
Ended Termination
Fast Response, No Output
Capacitors Required
Compatible with Active Negation
Drivers
15µA Supply Current in
Disconnect Mode
Logic Command Disconnects All
Termination Lines
Diffsense Line Driver
Ground Driver Integrated for
Single-Ended Operation
Current Limit and Thermal
Protection
Hot-Swap Compatible (Single-
Ended)
Available in 24-pin TSSOP
Package
PRODUCT HIGHLIGHT
LX5251
LX5251
+
-
+
-
PACKAGE ORDER INFO
PW
Plastic TSSOP
24-Pin
T
A
(°C)
RoHS Compliant / Pb-free
Transition DC: 0442
0 to 70
LX5251CPW
Note: Available in Tape & Reel.Append the letters “TR” to the
part number. (i.e. LX5251CPW-TR)
L
L
X
X
5
5
2
2
5
5
1
1
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 2
Copyright © 2002
Rev. 1.1, 2006-02-27
WWW.Microsemi .COM
LX5251
9-Line Multimode SCSI Terminator
P
R
ODUCTION
DATA SHEET
TM
®
ABSOLUTE MAXIMUM RATINGS
Term Power (V
TERM
)................................................................................................-0.3V to 7V
Operating Junction Temperature.......................................................................................150°C
Storage Temperature Range...............................................................................-65°C to 150°C
Peak Package Solder Reflow Temperature (40 second maximum exposure)...... 260°C (+0, -5)
Note: Exceeding these ratings could cause damage to the device. All voltages are with respect to
Ground. Currents are positive into, negative out of specified terminal.
THERMAL DATA
PW
24 Pin Plastic TSSOP
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θ
JA
100°C/W
Junction Temperature Calculation: T
J
= T
A
+ (P
D
x θ
JA
).
The θ
JA
numbers are guidelines for the thermal performance of the device/pc-board system.
All of the above assume no ambient airflow. θ
JA
can vary significantly depending on
mounting technique.
MASTER/SLAVE FUNCTION TABLE
Master/Slave DIFFSENSE Status
L* HI Z 0mA
H 1.3V 10mA Source
Open (Pull-Up) 1.3V 10mA Source
* When in Low state, terminator will sense state of DIFFSENS line.
PACKAGE PIN OUT
2
3
4
5
6
7
8
9
10
11
12
13
14
1
24
23
22
21
20
19
18
17
16
15
1+
1-
2+
2-
3+
3-
4+
4-
5+
5-
DISC
GND
VTERM
NC
9-
9+
8-
8+
7-
7+
6-
6+
DIFFSENSE
M/Sb
PW PACKAGE
(Top View)
N/C = Not internally connected
RoHS / Pb-free 100% Matte Tin Lead Finish
DIFFSENSE/POWER UP/POWER DOWN FUNCTION TABLE
Outputs
DISCONNECT DIFFSENSE
Status Type
Quiescent
Current
L < 0.5V Enable SE 55mA
L 0.7V – 1.9V Enable LVD 35mA
L > 2.4V Disable HI-Z 8mA
H or Open X Disable HI-Z 10µA
P
P
A
A
C
C
K
K
A
A
G
G
E
E
D
D
A
A
T
T
A
A
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 3
Copyright © 2002
Rev. 1.1, 2006-02-27
WWW.Microsemi .COM
LX5251
9-Line Multimode SCSI Terminator
P
R
ODUCTION
DATA SHEET
TM
®
RECOMMENDED MAX OPERATING CONDITIONS
LX5251
Parameter Symbol
Min Typ Max
Units
LVD 2.9 5.25
VTerm
SE
V
TERM
3.5 5.25
V
Signal Line Voltage 0 5.0 V
Disconnect Input Voltage 0 V
TERM
V
Operating Junction Temperature T
J
0 125
°C
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, the following specifications apply over the operating ambient temperature 0°C≤ T
A
≤ 70°C, VTerm = 4.75V,
and DISC = L.
LX5251
Parameter Symbol Test Conditions
Min Typ Max
Units
`
LVD Terminator Section
All term lines open 35 45 mA
VTerm Supply Current LVD
ICC
DISC > 2.0V
15 35 µA
Common Mode Voltage V
CM
1.125 1.25 1.375 V
Offset Voltage V
OS
Open circuit between (-) and (+) terminals 100 112 125 mV
Differential Terminator Impedance Z
O
V
OUT
Differential = -1V to +1V 100 105 110 Ω
Common Mode Impedance Z
CM
0.5V to 2V 110 150 195 Ω
Output Capacitance (Note 1) C
O
DISC > 2.0V 3 pF
Mode Change Delay t
DF
Diffsense = 1.4V to 0V 100 115 300 ms
`
Diffsense Section
Diffsense Output Voltage V
DIFF
1.2 1.3 1.4 V
Diffsense Output Source Current I
DIFF
V
DIFF
= 0V 5 15 mA
Diffsense Sink Current I
SINK(DIFF)
V
DIFF
= 2.75V 20 200 µA
`
Single Ended Section
All tem lines = Open, Master/Slave = 0V 55 75 mA
All tem lines = 0.2V, Master/Slave = 0V 250 290 mA
VTerm Supply Current SE
ICC
DISC > 2.0V; T
A
= 25° 15 35 µA
Termination Output High Voltage V
O
2.5 2.7 3.1 V
Output Current I
O
V
OUT
= 0.2V 18.5 22.5 24 mA
Sink Current I
SINK
V
OUT
= 4V, All lines 40 65 mA
Output Capacitance (Note 1) C
O
DISC > 2.0V 3 pF
I
DDQ
DISC > 2.0V ; V
LINE
= 0 to 4V, T
A
= 25° 2 µA
Output Leakage
I
HP
DISC > 2.0V ;V
TERM
= Open, V
LINE
= 2.7V,
T
A
= 25°
1 µA
Ground Driver Impedance Z
G
I = 1mA 100 Ω
E
E
L
L
E
E
C
C
T
T
R
R
I
I
C
C
A
A
L
L
S
S
P1-P3P4-P6P7-P8

LX5251CPW

Mfr. #:
Buy LX5251CPW
Manufacturer:
Microchip / Microsemi
Description:
SCSI Interface IC
Lifecycle:
New from this manufacturer.
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