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LX5250CPW

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. 1.2b, 2005-08-29
WWW.Microsemi .COM
LX5250/5252
9-Line Multimode SCSI Terminator
P
R
OD
UCTION
DATA SHEET
TM
®
DESCRIPTION
The LX5250/52 is a multimode SCSI
terminator that is compatible with the
SCSI SPI-2 (Ultra2 SCSI), SCSI SPI-3
(Ultra3 SCSI or Ultra160 SCSI), 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 LX5250/52 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 LX5250/52 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 10mA.
Tying the DIFFSENSE pin high places the
LX5250/52 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 LX5250/52 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 LX5250/52 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 36-pin QSOP and 28-
pin TSSOP package
LX5250, 36-pin QSOP: Pin
Compatible With DS2118,
UCC5630A and UCC5672
LX5250 28-pin TSSOP: Pin
Compatible with DS2119, and
UCC5672
PRODUCT HIGHLIGHT
LX5250/
LX5252
LX5250/
LX5252
+
-
+
-
PACKAGE ORDER INFO
DB
QSOP
36-Pin
PW
TSSOP
28-Pin
T
A
(°C)
RoHS Compliant / Pb-free
Transition DC: 0535
RoHS Compliant / Pb-free
Transition DC: 0518
0 to 70
LX5250CDB
LX5252CDB
LX5250CPW
-
Note: Available in Tape & Reel.
Append the letters “TR” to the part number. (i.e. LX5250CDB-TR)
L
L
X
X
5
5
2
2
5
5
0
0
/
/
5
5
2
2
5
5
2
2
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 2
Copyright © 2002
Rev. 1.2b, 2005-08-29
WWW.Microsemi .COM
LX5250/5252
9-Line Multimode SCSI Terminator
P
R
OD
UCTION
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
RoHS / Pb-free 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
DB
36 Pin QSOP
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θ
JA
53.9°C/W
PW
28 Pin 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. (See Application Notes Section: Thermal
considerations)
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 DIFFSENSE line.
PACKAGE PIN OUT
2
3
4
5
6
7
8
9
10
11
12
13
14
1
27
26
25
24
23
22
21
20
19
29
17
16
15
28
1+
1-
2+
2-
HEATSINK
HEATSINK
NC
3+
3-
4+
4-
V
TERM
HVD
LVD
SE
9-
9+
8-
8+
HEATSINK
HEATSINK
HEATSINK
7-
7+
6-
18
35
34
33
32
31
30
36
NC
NC
HEATSINK
5+
5-
DISCONNECT
GND
6+
DIFFB
DIFFSENSE
M/Sb
LX5250/5252
DB PACKAGE
(Top View)
N/C = Not internally connected
NC
2
3
4
5
6
7
8
9
10
11
12
13
14
1
27
26
25
24
23
22
21
20
19
18
17
16
15
28
1+
1-
2+
2-
NC
3+
3-
4+
4-
5+
5-
DISCONNECT
GND
V
TERM
NC
9-
9+
8-
8+
NC
7-
7+
6-
6+
DIFFB
DIFFSENSE
M/Sb
LX5250 ONLY
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
LX5250
DISCONNECT
LX5252
DISCONNECT
DIFFSENSE
Status Type
Quiescent
Current
L H < 0.5V Enable SE 55mA
L H 0.7V – 1.9V Enable LVD 35mA
L H > 2.4V Disable HI-Z 8mA
H or Open L 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. 1.2b, 2005-08-29
WWW.Microsemi .COM
LX5250/5252
9-Line Multimode SCSI Terminator
P
R
OD
UCTION
DATA SHEET
TM
®
RECOMMENDED MAX OPERATING CONDITIONS
LX5250/52
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.
For the LX5250, DISCONNECT = L; for the LX5252, DISCONNECT = H.
LX5250/52
Parameter Symbol Test Conditions
Min Typ Max
Units
`
LVD Terminator Section
All term lines open 35 45 mA
VTerm Supply Current LVD
ICC
LX5250: DISCONNECT > 2.0V;
LX5252:
DISCONNECT < 0.8V
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
LX5250: DISCONNECT > 2.0V;
LX5252:
DISCONNECT < 0.8V
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
LX5250: DISCONNECT > 2.0V;
LX5252:
DISCONNECT < 0.8V
15 35 µA
Termination Output High Voltage V
O
2.5 2.85 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
LX5250: DISCONNECT > 2.0V;
LX5252:
DISCONNECT < 0.8V,
V
LINE
= 0 to 4V, T
A
= 25°
2 µA
Output Leakage
I
HP
LX5250: DISCONNECT > 2.0V;
LX5252:
DISCONNECT < 0.8V,
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

LX5250CPW

Mfr. #:
Buy LX5250CPW
Manufacturer:
Microchip / Microsemi
Description:
SCSI Interface IC
Lifecycle:
New from this manufacturer.
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