LX5245CPW-TR [MICROSEMI]
SCSI Terminator, 9-Line, 105ohm, PDSO24, ROHS COMPLIANT, PLASTIC, TSSOP-24;
| 型号： | LX5245CPW-TR |
| 厂家： | 
Microsemi |
| 描述： | SCSI Terminator, 9-Line, 105ohm, PDSO24, ROHS COMPLIANT, PLASTIC, TSSOP-24 |
| 文件： | 总7页 (文件大小：178K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
TM
UltraMAX
LX5245/5246/5247
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 LX5245/5246/5247 ICs are Low Volt-
age Differential (LVD) Terminators de-
signed to comply with the LVD termination
specification in the SPI-2 document. The
LX5245/5246/5247 are designed specifically
for LVD applications. Because the LX5245/
5246/5247supportonlyLVD, theyhavelower
output capacitance than multimode termina-
tors such as the LX5240.
The LX5245/5246/5247 Utilize
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 LX5245/5246/5247 Are
Enabled, The Differential Sense
(DIFFSENSE) Pin Supplies A Voltage
Between 1.2V And 1.4V. In application,
the terminator DIFFSENSE output is con-
nected 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,
indicatingasingleendeddevice, theLX5245/
5246/5247 output will be HiZ. If the
DIFFSENSE line is HIGH, indicating a high
voltage differential device the LX5245/5246/
5247 output will be HiZ.
The LX5245/5246/5247 ICs Have A TTL
Compatible DISCONNECT Pin. The
LX5245/47 is active LOW and the LX5246
is active HIGH. 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
ꢀ Mention 5249 as LVD only terminator
with pinout compatable with industry
standard multi-mode terminators
ꢀꢀꢀPin compatable with unitrode UCC5640
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 1
V O D
VOD = V(-) - V(+), Logic = 0
NEGATED
V(+)
100mV
0V
V(-)
-100mV
LX5245/46/47
LX5245/46/47
PACKAGE ORDER INFO
Plastic TSSOP
24-pin
28-PIN
PW
TA (°C)
LX5245CPW
0 to 70
LX5246CPW
Note: All surface-mount packages are available in Tape & Reel.
Append the letter "T" to part number. (i.e. LX5245CPWT)
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 © 2000
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
LX5245/5246/5247
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
LX5245/46 CPW
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
N.C.
1
2
3
4
5
6
7
8
9
1
11
1
24
23
22
21
20
1
VTERM
9-
1+
1-
9+
8-
2+
2-
8+
7-
9
8
7
6
3+
3-
1
7+
6-
1
4+
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.
1
4-
6+
0
1
5
3
DIFFB
DIFFSENSE
GND
5-
14
5+
2
1
DISC
THERMAL DATA
24L PW PACKAGE (Top View)
("N.C." = No Internal Connections)
PW PACKAGE:
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
100°C/W
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.
DIFFSENSE / POWER UP / POWER DOWN FUNCTION TABLE
LX5245/LX5247
DISCONNECT
LX5246
DISCONNECT
Outputs
Quiescent
Current
DIFFSENSE
Status
Type
L
H
L < 0.5V
Disable
Enable
Disable
Disable
Disable
HiZ
LVD
HiZ
HiZ
HiZ
2mA
21mA
2mA
L
L
H
H
0.7V to 1.9V
H > 2.4V
H
L
X
X
10µA
10µA
Open
Open
Copyright © 2000
Rev. 0.6 10/00
2
P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7
LX5245/5246/5247
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
LX5245 / 5246/5247
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: LX5245/47 = L, LX5246 = H. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to
the ambient temperature.)
LX5245 / 5246
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
DISCONNECT: LX5245/47 = H, LX5246 = L
Common Mode Voltage
VOM
VOS
ZD
1.125 1.25 1.375
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
100 112
100 105
100 200
2.5
125 mV
110
300
Ω
Ω
pF
µA
µA
ms
ZCM
Co
ILeak
0V to 2.5V
DISCONNECT: LX5245/47 = H, LX5246 = L
DISCONNECT: LX5245/47 = H, LX5246 = L, VLINE = 0 to 4V, TA=25°C
DISCONNECT: LX5245/47 = H, LX5246 = L, VTERM = 0V, VLINE = 2.7V
DIFFSENSE = 1.4V to 0V
Output Leakage
0
2
1
Mode Change Delay
tDF
100 150
DIFFSENSE Section
DIFFSENSE Output Voltage
DIFFSENSE Output Source Current
DIFFSENSE Sink Current
VDIFF
IDIFF
1.2
5.0
1.3
1.4
15.0 mA
200
10
V
DIFFSENSE = 0V
ISINK(DIFF) VIN = 2.75V
ILEAK(DIFF) DISCONNECT: LX5245/47 = H, LX5246 = L, TA = 25°C
µA
µA
DIFFSENSE Output Leakage
DISCONNECT Section
DISCONNECT Threshold
Input Current
VTH
IIH
0.8
2.0
10
10
V
µA
µA
DISCONNECT: LX5245/47 = 0V
DISCONNECT: LX5246 = 3.3V
Note 3. Open circuit failsafe voltage.
Copyright © 2000
Rev. 0.6 10/00
3
P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7
LX5245/5246/5247
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
DISC
Internal VREF
1.30V
HVD
LVD
LVD (-)
SE
2D(-)
2cm
200
52.5
LVD
1.25V
2D(+)
52.5
HVD
LVD (+)
LVD
SE
10mA
DIFFSENSE
1.07mA
HVD
Window
Comp.
SE
LATCH
LVD
DIFF B
Power ON
& Mode
Change
Delay
Power ON
FIGURE 1 — LX5245 Block Diagram
Copyright © 2000
Rev. 0.6 10/00
4
P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7
LX5245/5246/5247
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-, 7-, 8-, 9-1
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 impedance (big traces on PCB). Keeping distances very
short from the decoupling capacitors to the V
pin is also critical. The value of the decoupling
capacitor is somewhat layout dependant andTEsRoMme applications may benefit from high-frequency
decoupling with 0.1µF capacitors right at VTERM pin.
DISC1
GND1
Enables / disables terminator. See Power Down Function Table for logic levels per device.
Terminator ground pin. Connect to ground.
DIFFSENSE1
Used to drive DIFFSENS output 3V @ 10 mt. Usually connected through a 20kOhm resistor to DIFF B
pin.
DIFFB1
Used to detect the SCSI BUS mode (LUD, HUD, SE)
Copyright © 2000
Rev. 0.6 10/00
5
P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7
LX5245/5246/5247
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
-
+
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
+
L
L
L
X
X
X
5
5
5
2
2
2
4
4
4
5
6
7
L
L
L
X
X
X
5
5
5
2
2
2
4
4
4
5
D
a
t
a
L
i
n
s
e
(
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
-
+
M
+
4
.
7
µ
F
4
.
7
µ
F
L
L
L
X
X
X
5
5
5
2
2
2
4
4
4
5
L
L
L
X
X
X
5
5
5
2
2
2
4
4
4
5
6
7
D
a
t
a
L
i
n
s
e
(
9
)
-
+
9
9
-
+
D
M
G
D
D
D
V
1
1
-
+
M
+
L
L
L
X
X
X
5
5
5
2
2
2
4
4
4
5
L
L
L
X
X
X
5
5
5
2
2
2
4
4
4
5
6
7
C
o
t
n
r
o
l
L
i
n
s
e
(
9
)
69
79
-
+
9
9
-
+
D
M
G
D
D
D
FIGURE 2 — Linfinity ONLY Application Schematic
Copyright © 2000
Rev. 0.6 10/00
6
P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7
LX5245/5246/5247
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
E
R
I
P
H
E
R
A
L
T
E
R
M
P
O
W
E
R
T
D
E
R
M
P
O
W
E
R
V
1
-
1
1
-
+
V
V
V
T
T
T
E
E
E
R
M
T
T
T
E
E
E
R
R
R
M
M
M
+
L
L
L
X
X
X
5
5
5
2
2
2
4
4
4
5
L
L
X
X
5
5
2
2
4
4
5
6
D
a
t
a
L
i
n
s
e
(
9
)
-
9
9
-
+
L
X
5
2
4
7
+
D
I
S
C
O
N
E
N
C
T
I
S
C
O
N
E
N
C
T
D
I
I
I
S
S
S
C
C
C
O
O
O
N
N
N
E
E
E
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
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
2
0
k
2
0
k
G
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
0
.
1
µ
F
0
.
1
µ
F
N
N
N
.
.
.
C
C
C
.
.
.
*
*
*
N
N
N
.
.
.
C
C
C
.
.
.
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*
P
P
P
i
i
i
n
n
n
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1
1
P
P
P
i
i
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n
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n
1
1
1
4
4
4
.
.
.
7
7
7
µ
µ
µ
F
F
F
*
*
*
4
4
4
.
.
.
7
7
7
µ
µ
µ
F
F
F
*
*
*
V
1
1
-
+
R
M
+
L
L
L
X
X
X
5
5
5
2
2
2
4
4
4
5
L
L
X
X
5
5
2
2
4
4
5
6
D
a
t
a
L
i
n
s
e
(
9
)
-
+
9
9
-
+
L
X
5
2
4
7
4 . 7 µ F
4
.
7
µ
F
D
N
D
D
D
I
F
F
S
E
N
S
E
G
V
1
1
-
+
R
M
+
L
L
L
X
X
X
5
5
5
2
2
2
4
4
4
5
L
L
X
X
5
5
2
2
4
4
5
6
C
o
t
n
r
o
l
L
i
n
s
e
(
9
)
-
+
9
9
-
+
L
X
5
2
4
7
D
N
D
D
D
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F
F
S
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N
S
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*
T
h
e
c
a
p
c
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t
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1
c
a
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b
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p
l
a
c
e
d
o
n
h
t
e
L
X
5
2
C
4
P
W
5
,
L
X
5
2
C
4
P
W
6
o
r
t
h
e
L
X
5
2
C
4
P
W
7
o
t
b
e
p
i
n
-
c
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p
t
a
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b
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i
t
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e
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.
T
h
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V / R
E G
E
F
c
a
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t
o
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e
q
i
r
e
u
d
.
R
FIGURE 3 — Suggested Linfinity LX5245/5246/5247 Universal Application Schematic
(Please Reference Manufacturer's Current Data Sheet To Ensure Compatibility)
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 © 2000
Rev. 0.6 10/'00
7
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