LX5249CPW [MICROSEMI]
SCSI - Low Voltage Differential (LVD) ; SCSI - 低压差分（ LVD ）\n
| 型号： | LX5249CPW |
| 厂家： | 
Microsemi |
| 描述： | SCSI - Low Voltage Differential (LVD)
|
| 文件： | 总6页 (文件大小：170K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
UltraMAXTM
LX5248/LX5249
9-LI N E LVD SCSI TE 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 N N O V A T I O N
P R E L I M I N A R Y D A T A S H E E T
DESCRIPTION
KEY FEATURES
■ 2.5pF Typical Disabled Output
Capacitance
■ Fast Response, No External Capacitors
Required
■ 5µA Supply Current In Disconnect Mode
■ 20mA Supply Current During Normal
Operation
■ Logic Command Disconnects All
Termination Lines
The LX5248/49 IC is a Low Voltage Dif-
ferential (LVD) Terminator designed to
comply with the LVD termination specifica-
tion in the SPI-2 document. The LX5248/
49 is designed specifically for LVD applica-
tions. Because the LX5248/49 supports only
LVD, it has lower output capacitance than
multimode terminators such as the LX5240.
The LX5248/49 Utilizes Linfinity’s
UltraMAX Technology which delivers the
ultimate in SCSI bus performance while
saving component cost and board area.
Elimination of the external capacitors also
mitigates the need for a lengthy capacitor
selection process. The individual high band-
width drivers also maximize channel sepa-
ration and reduces channel-to-channel noise
and cross talk. The high-bandwidth
UltraMAX architecture insures ULTRA-2 per-
formance, while providing a clear migration
path to ULTRA-3 and beyond.
When The LX5248/49 Is Enabled, The
Differential Sense (DIFFSENSE) Pin Sup-
plies A Voltage Between 1.2V And 1.4V.
In application, the terminator DIFFSENSE
output is connected to the system
DIFFSENSE line. If there are no single ended
or HVD devices attached to the system the
LVD output will be enabled. If the
DIFFSENSE line is LOW, indicating a single
ended device, the LX5248/49 output will be
HiZ. If the DIFFSENSE line is HIGH, indi-
cating a high voltage differential device the
LX5248/49 output will be HiZ.
The LX5248/49 IC Has A TTL Compat-
ible DISCONNECT Pin. The LX5248/49 is
active LOW. During sleep mode, power
dissipationisreducedtoameager5µA, while
also placing all outputs in a HI Z state. Also
during sleep mode, the DIFFSENSE function
is disabled and is placed in a HI Z state.
■ Diffsense Line Driver
■ Current Limit And Thermal Protection
■ Compatible With The Pending SPI-2 LVD
Specification
■ Pin Compatible With Industry Standard
Multi-Mode Terminators
■ For UCC5240 Pin Compatible LVD ONLY
Terminator (See LX5245/5246)
NOTE: For current data & package dimensions, visit our web site: http://www.linfinity.com.
PRODUCT HIGHLIGHT
B U S V O L T A G E /
V O D
VOD = V(-) - V(+), Logic = 0
NEGATED
V(+)
100mV
0V
V(-)
-100mV
LX5248/49
LX5248/49
PACKAGE ORDER INFORMATION
Plastic SSOP
36-pin
Plastic TSSOP
24-pin
Plastic TSSOP
TA (°C)
0 to 70K
DB
PW
PW
28-pin
LX5249CDBK
LX5249CPWK
LX5248CPW
Note: All surface-mount packages are available in Tape & Reel.
Append the letter "T" to part number. (i.e. LX5249CPWT)
L I N F I N I T Y M I C R O E L E C T R O N I C S I N C .
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
Copyright © 2001
Rev. 0.6 10/00
1
P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7
LX5248/LX5249
UltraMAX
9-LI N E LVD SCSI TE R M I N AT O R
P R E L I M I N A R Y D A T A S H E E T
ABSOLUTE MAXIMUM RATINGS (Note 1)
PACKAGE PIN OUTS
TermPwr Voltage ..............................................................................................+6.5V
Signal Line Voltage ...................................................................................0V to 6.5V
Differential Voltage ...................................................................................0V to 6.5V
Operating Junction Temperature
Plastic (PW Package) ................................................................................... 150°C
Storage Temperature Range ..............................................................-65°C to 150°C
Lead Temperature (Soldering, 10 seconds) .................................................... 300°C
1
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
VTERM
N.C.
2
HVD
N.C.
3
LVD
N.C.
4
SE
1+
5
9-
1-
6
9+
2+
7
8-
2-
8
8+
HEATSINK/GND
9
HEATSINK/GND
HEATSINK/GND
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.
10/
11/
12/
13/
14/
15/
16/
17/
18/
HEATSINK/GND
HEATSINK/GND
HEATSINK/GND
3+
7-
3-
7+
4+
THERMAL DATA
6-
4-
6+
5+
5-
DB PACKAGE:
DIFF B
DIFFSENSE
MASTER/SLAVE
DISCONNECT
GND
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
PW PACKAGE:
50°C/W
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
100°C/W
LX5249C ("N.C." = No Internal Connection)
DB PACKAGE (Top View)
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.
1+
1
24
23
22
21
20
19
18
17
16
15
14
13
VTERM
1-
2
N.C.
3
2+
9-
4
2-
9+
MASTER / SLAVE FUNCTION TABLE
5
3+
8-
6
3-
8+
MASTER /
SLAVE
DIFFSENSE
Status
Output
Current
7
4+
7-
8
4-
7+
9
5+
5-
6-
L*
H
HI Z
1.3V
1.3V
0mA
15mA Source
15mA Source
10/
11/
12/
6+
DISCONNECT
GND
DIFFSENSE
MASTER/SLAVE
Open (Pull-up)
LX5249CPW ("N.C." = No Internal Connection)
PW PACKAGE (Top View)
* When in Low state, terminator will detect state of DIFFSENSE line.
DIFFSENSE / POWER UP / POWER DOWN FUNCTION TABLE
N.C.
VTERM
1
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1+
LVD
2
LX5248/LX5249
DISCONNECT
Outputs
Quiescent
Current
DIFFSENSE
1-
9-
3
Status
Type
2+
9+
4
2-
8-
5
L
L < 0.5V
Disable
Enable
Disable
Disable
Disable
HiZ
LVD
HiZ
HiZ
HiZ
2mA
21mA
2mA
N.C.
8+
6
L
L
0.7V to 1.9V
3+
7
N.C.
3-
8
7-
H > 2.4V
4+
9
7+
10/
11/
12/
13/
14/
4-
6-
H
X
X
10µA
10µA
5+
5-
6+
Open
DIFFB
DISCONNECT
GND
DIFFSENSE
MASTER/SLAVE
LX5248CPW ("N.C." = No Internal Connection)
PW PACKAGE (Top View)
Copyright © 2001
Rev. 0.6 1/01
2
P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7
LX5248/LX5249
UltraMAX
9-LI N E LVD SCSI TE R M I N AT O R
P R E L I M I N A R Y D A T A S H E E T
RECOMMENDED OPERATING CONDITIONS
(Note 2)
Recommended Operating Conditions
Parameter
Symbol
Units
Min.
Typ.
Max.
Termpwr Voltage
Signal Line Voltage
VTERM
3.0
0
5.25
5.0
V
V
V
Disconnect Input Voltage
0
VTERM
Operating Junction Temperature Range
LX5248 / LX5249
0
70
°C
Note 2. Range over which the device is functional.
ELECTRICAL CHARACTERISTICS
(Unless otherwise specified, these specifications apply over the operating ambient temperature range of 0°C ≤ TA ≤ 70°C. TermPwr = 3.3V,
DISCONNECT: LX5248/49 = L. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient
temperature.)
LX5248 / 5249
Parameter
Symbol
Test Conditions
Units
Min. Typ.
Max.
LVD Terminator Section
TermPwr Supply Current
LVD ICC All term lines = Open
21
5
25
10
mA
µA
V
mV
Ω
DISCONNECT: LX5248/49 = H
Common Mode Voltage
VCM
VFSB
ZD
1.125
100
100
1.25
112
105
200
2.5
0
1.375
125
110
300
Offset Voltage (Fail Safe Bias Voltage)
Differential Terminator Impedance
Common Mode Impedance
Output Capacitance
Open circuit between - and + (see Note 3)
VOD = -1V to 1V
ZCM
CO
ILEAK
0V to 2.5V
100
Ω
DISCONNECT: LX5248/49 = H
DISCONNECT: LX5248/49 = H, VLINE = 0 to 4V, TA=25°C
DISCONNECT: LX5248/49 = H, VTERM = 0V, VLINE = 2.7V
DIFFSENSE = 1.4V to 0V
pF
µA
µA
ms
Output Leakage
2
1
150
Mode Change Delay
tDF
100
DIFFSENSE Section
DIFFSENSE Output Voltage
DIFFSENSE Output Source Current
DIFFSENSE Sink Current
VDIFF
IDIFF
1.2
5.0
1.3
1.4
15.0
200
10
V
DIFFSENSE = 0V
mA
µA
µA
ISINK (DIFF) VIN = 2.75V
ISINK (DIFF) DISCONNECT: LX5248/49 = H, TA = 25°C
DIFFSENSE Output Leakage
DISCONNECT Section
DISCONNECT Threshold
Input Current
VTH
IIL
0.8
0.8
2.0
10
V
µA
DISCONNECT: LX5248/49 = 0V
MASTER / SLAVE Section
MASTER / SLAVE Threshold
Input Current
VTH (MS)
IIL (MS)
2.0
10
V
µA
MASTER / SLAVE: LX5248/49 = 0V
Note 3. Open circuit failsafe voltage.
Copyright © 2001
Rev. 0.6 1/01
3
P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7
LX5248/LX5249
UltraMAX
9-LI N E LVD SCSI TE R M I N AT O R
P R E L I M I N A R Y D A T A S H E E T
BLOCK DIAGRAM
Power ON
1 of 9
1.07mA
VTERMPWR
Internal VREF
1.30V
HVD
LVD (-)
LVD
SE
ZD(-)
52.5
Zcm
200
LVD
1.25V
ZD(+)
52.5
HVD
LVD (+)
LVD
SE
10mA
M/S
DIFFSENSE
1.07mA
HVD
Window
Comp.
SE
LATCH
HVD
LVD
SE
LVD
DIFF B
Power ON
& Mode
Change
Delay
Power ON
FIGURE 1 — LX5248 / 5249 Block Diagram
Copyright © 2001
Rev. 0.6 1/01
4
P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7
LX5248/LX5249
UltraMAX
9-LI N E LVD SCSI TE R M I N AT O R
P R E L I M I N A R Y D A T A S H E E T
FUNCTIONAL PIN DESCRIPTION
Pin
Designator
Description
1-, 2-, 3-, 4-, 5-, 6-, 8-, 8-, 9-/
Negative signal termination lines.
1+, 2+, 3+, 4+, 5+, 6+, 7+, 8+, 9+/ Positive signal termination lines.
VTERM
Power supply pin for terminator. Connect to SCSI bus TERMPWR. Must be decoupled by one 4.7µF
low-ESR capacitor for every three terminator devices. It is absolutely necessary to connect this pin to
the decoupling capacitor through a very low impedence (big traces on PCB). Keeping distances
very short from the decoupling capacitors to the VTERM pin is also critical. The value of the
decoupling capacitor is somewhat layout dependant and some applications may benefit from high-
frequency decoupling with 0.1µF capacitors right at VTERM pin.
DISCONNECT/
GND/
Enables / disables terminator. See Power Down Function Table for logic level per device.
Terminator ground pin. Connect to ground.
MASTER / SLAVE/
Sometimes referred to as M/S pin in this data sheet. Used to select which terminator is the control-
ling device. MASTER/SLAVE pin High or Open enables the DIFFSENSE output drive. Please see
MASTER/SLAVE Function Table.
DIFFSENSE/
DIFFB/
This is a dual function pin. It drives the SCSI bus DIFFSENS line. It is also the sense pin to detect the
SCSI bus mode (LVD, SE or HVD). DIFFSENSE output drive can be disabled with Low level on the
MASTER/SLAVE pin. Please see DIFFSENSE and MASTER/SLAVE Function Tables. Internally
connected to DIFFB pin through 20kOhm resistor.
Internally connected to DIFFSENSE pin through 20kOhm resistor. It can be used as a mode sense
pin when the device is a non-controlling terminator (MASTER/SLAVE pin is Low). An RC filter
(20kOhm / 0.1µF) is not required on the LX5249, as it has an internal timer.
SE/
LVD/
Single-ended output; when High, terminator is operating in SE mode.
Low Voltage Differential output. When High, terminator is operating in LVD mode.
High Voltage Differential output. When High, terminator is operating in HVD mode.
HVD/
HEATSINK/
Attached to die mounting pad, but not bonded to GND pin. Pins should be considered a heat sink
only, and not a true groung connection. It is recommended that these pins be connected to ground,
but can be left floating.
Copyright © 2001
Rev. 0.6 1/01
5
P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7
LX5248/LX5249
UltraMAX
9-LI N E LVD SCSI TE R M I N AT O R
P R E L I M I N A R Y D A T A S H E E T
APPLICATION SCHEMATIC
H
O
S
T
P
R
E
I
P
H
E
R
A
L
T
E
R
M
P
O
W
E
R
T
E
R
M
P
O
W
E
R
V
1
1
-
+
1
1
-
+
V
V
V
T
T
T
E
E
E
R
R
R
M
T
T
T
E
E
E
R
R
R
M
M
M
D
a
t
a
L
i
n
s
e
(
9
)
L
L
X
X
5
5
2
2
4
4
8
9
L
L
X
X
5
5
2
2
4
4
8
9
9
9
-
+
9
9
-
+
D
I
S
C
O
N
E
N
C
T
D
I
S
C
O
N
E
N
C
T
D
M
G
I
I
I
S
S
S
C
C
C
O
O
O
N
N
N
E
E
E
N
N
N
C
C
C
T
T
T
D
D
D
I
I
I
S
S
S
C
C
C
O
O
O
N
N
N
E
E
E
N
N
N
C
C
C
T
T
T
/
/
/
S
S
S
M
M
M
/
/
/
S
S
S
D
I
F
F
S
E
N
S
E
D
D
I
I
I
F
F
F
F
F
F
S
S
S
E
E
E
N
N
N
S
S
S
E
E
E
N
N
N
D
D
D
G
G
G
N
N
N
D
D
D
D
D
D
I
I
I
F
F
F
F
F
F
B
B
B
*
*
*
I
I
I
F
F
F
F
F
F
B
B
B
*
*
*
V
1
1
1
1
-
+
M
+
4
.
7
µ
F
4
.
7
µ
F
D
a
t
a
L
i
n
s
e
(
9
)
L
L
X
X
5
5
2
2
4
4
8
9
L
L
X
X
5
5
2
2
4
4
8
99
9
-
+
9
9
-
+
D
M
G
D
D
D
I
F
F
S
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N
S
E
V
1
1
1
1
-
+
M
+
C
o
t
n
r
o
l
L
i
n
s
e
(
9
)
L
L
X
X
5
5
2
2
4
4
8
L
L
X
X
5
5
2
2
4
4
8
9
99
9
-
+
9
9
-
+
D
M
G
D
D
D
I
F
F
S
E
N
S
E
*
D
I
F
F
B
P
i
n
n
t
o
p
r
e
s
e
t
n
o
n
L
X
5
2
C
4
P
W
8
5
/
2
C
4
P
W
9
P
a
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a
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e
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t
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p
i
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n
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p
c
a
k
a
g
e
.
FIGURE 2 — LX5248 / 5249 Application Schematic
UltraMAX is a trademark of Linfinity Microelectronics Inc.
PRELIMINARY DATA - Information contained in this document is pre-production data, and is proprietary to LinFinity. It may
not modified in any way without the express written consent of LinFinity. Product referred to herein is offered in sample form
only, and Linfinity reserves the right to change or discontinue this proposed product at any time.
Copyright © 2001
Rev. 0.6 1/01
6
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