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LX5255CPW

P1-P3P4-P6P7-P7
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
Copyright © 2000
Rev. 1.1, 2006-02-27
WWW.Microsemi .COM
LX5255
9-Line LVD SCSI Terminator
P
R
ODUCTION
DATA SHEET
TM
®
DESCRIPTION
The LX5255 is a Low Voltage
Differential (LVD) terminator
designed to comply with the LVD
termination specification in the SPI-4
document. The LX5255 is specifically
designed for LVD only applications.
Because the LX5255 supports only
LVD, it has lower output capacitance
than multimode terminators such as
the LX5250.
The LX5255 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 LX5255 is enabled, the
Differential Sense (DIFSENS) pin
supplies a voltage between 1.2V and
1.4V. In application, the terminator
DIFFB input is connected to the system
DIFSENS line. If there are no single
ended or High Voltage Differential
(HVD) devices attached to the system,
the LVD output will be enabled. If the
DIFSENS line is LOW, indicating a
single ended device, the LX5255 output
will be HiZ. If the DIFSENS line is
HIGH, indicating a HVD device, the
LX5255 output will be HiZ.
The LX5255 has a TTL compatible
sleep/disable mode. Applying a logic
HIGH to the DISC pin puts the LX5255
in sleep mode. During sleep mode,
power dissipation is reduced to a meager
5μA while also placing all outputs and
the DIFSENS function in a HiZ state.
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
KEY FEATURES
Compliant with SPI-2 (Ultra2),
SPI-3 (Ultra160), and SPI-4
(Ultra320)
2.5pF Maximum Disabled Output
Capacitance
Fast Response, No External
Capacitors Required
5µA Supply Current in Disconnect
Mode
30mA Supply During Normal
Operation
Logic Command Disconnects All
Termination Lines
DIFSENS Line Driver
Current Limit and Thermal
Protection
Pin Compatible With Unitrode
UCC5640
TYPICAL APPLICATION
LX5255
LX5255
+
-
+
-
LX5255 Typical Application
PACKAGE ORDER INFO
PW
Plastic TSSOP
24-Pin
T
A
(°C)
RoHS Compliant / Pb-free
Transition DC: 0442
0 to 70
LX5255CPW
Note: Available in Tape & Reel. Append the letters “TR” to the
part number. (i.e. LX5255CPW-TR)
L
L
X
X
5
5
2
2
5
5
5
5
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 2
Copyright © 2000
Rev. 1.1, 2006-02-27
WWW.Microsemi .COM
LX5255
9-Line LVD SCSI Terminator
P
R
ODUCTION
DATA SHEET
TM
®
ABSOLUTE MAXIMUM RATINGS
Term Power (V
TERM
)............................................................................................-0.3V to 7V
Signal Line Voltage .............................................................................................-0.3V to 7V
Differential Voltage .............................................................................................-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
24L 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)
DIFFB/POWER UP/POWER DOWN FUNCTION TABLE
Outputs
DISC DIFFB
Status Type
Quiescent
Current
L L < 0.5V Disable HI-Z 8mA
L 0.7V to 1.9V Enable LVD 30mA
L H > 2.4V Disable HI-Z 8mA
H or Open X Disable HI-Z 10µA
PACKAGE PIN OUT
1-
2+
9+
NC
2
3
4
5
6
7
8
9
10
11
12
1
23
22
21
20
19
18
17
16
15
14
13
24
1+
2-
3+
3-
4+
4-
DIFFB
DIFSENS
GND
9-
8-
8+
7-
7+
6-
6+
5-
5+
DISC
VTERM
PW PACKAGE
(Top View)
NC – No Internal Connection
RoHS / Pb-free 100% Matte Tin Lead Finish
RECOMMENDED MAX OPERATING CONDITIONS
LX5255
Parameter Symbol
Min Typ Max
Units
VTerm V
TERM
2.7 5.25 V
Signal Line Voltage 0 5.0 V
Disconnect Input Voltage 0 V
TERM
V
Operating Junction Temperature T
J
0 70 °C
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 © 2000
Rev. 1.1, 2006-02-27
WWW.Microsemi .COM
LX5255
9-Line LVD SCSI Terminator
P
R
ODUCTION
DATA SHEET
TM
®
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, the following specifications apply over the operating ambient temperature 0°C ≤ T
A
≤ 70°C, VTerm = 3.3V,
and DISCONNECT = 0V.
LX5255
Parameter Symbol Test Conditions
Min Typ Max
Units
`
LVD Terminator Section
All term lines open 30 35 mA
VTerm Supply Current I
CC
DISCONNECT > 2.0V 5 20 µA
Common Mode Voltage V
CM
1.125 1.25 1.375 V
Offset Voltage (Note 1) V
OS
Open circuit between (-) and (+) terminals 100 112 125 mV
Differential Terminator Impedance Z
D
V
OUT
Differential = -1V to +1V 100 105 110
Common Mode Impedance Z
CM
0.5V to 2V 110 150 190
Output Capacitance (Note 2) C
O
DISCONNECT > 2.0V 3 pF
Mode Change Delay
t
DF
DIFSENS = 1.4V to 0V 100 115 300 ms
`
DIFSENS Section
DIFSENS Output Voltage V
DIFF
1.2 1.3 1.4 V
DIFSENS Output Source Current I
DIFF
DIFSENS = 0V 5 15 mA
DIFSENS Sink Current I
SINK(DIFF)
V
TERM
= 2.75V 20 200 µA
`
Disconnect Section
Disconnect Threshold V
TH
0.8 2.0 V
Input Current I
IH
DISCONNECT = 0V 10 µA
Note 1: Open Circuit failsafe voltage.
Note 2: Guaranteed by design.
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-P7

LX5255CPW

Mfr. #:
Buy LX5255CPW
Manufacturer:
Microchip / Microsemi
Description:
LVDS Interface IC
Lifecycle:
New from this manufacturer.
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