MICROSEMI LX5205CDWP

LIN D O C #: 5205
LX5205
18-L INE P LUG
T
H E
I
N F I N I T E
P
O W E R
O F
I
N N O VA T I O N
P
AND
P LAY , µP OWER SCSI T ERMINATOR
R E L I M I N A R Y
DESCRIPTION
The LX5205 is an eighteen line active terminator for the SCSI parallel bus. This SCSI
standard recommends active termination at
both ends of the SCSI bus.
During disconnect mode, the LX5205
requires a meager 500nA of supply current
while offering only 2.5pF of output capacitance. To enter this low power mode, the
disconnect pins can be left open (floating)
or driven low thereby disconnecting the
terminating resistors and placing the internal
low dropout regulator into low power
mode. In disconnect mode each termination
line presents a high impedance to the SCSI
bus with the overall effect being to preserve
high signal integrity and subsequent reliable, error free communications. The
LX5205 has two disconnect pins for SCSI
Plug and Play (PnP) applications.
D
A T A
S
H E E T
K E Y F E AT U R E S
During normal operation, the LX5205
consumes only 800µA of current which is
the lowest enabled supply current of any
terminator available on the market today.
Linfinity's proprietary BiCMOS low dropout
regulator architecture enables this unique
and very efficient operating characteristic.
The LX5205 also offers a precisely
trimmed channel output current specified
to a 5% tolerance. The maximum value of
the output current is trimmed as closely as
possible to the SCSI standard maximum
specification to give the highest possible
noise margin for fast SCSI operation. And
finally, the LX5205 sinks up to 100mA of
current making it compatible with today's
fast active negation drivers.
The LX5205 is a superior, pin-for-pin
replacement for the UC5607.
■ SCSI PLUG AND PLAY, DUAL LOW
DISCONNECT, LOGIC LOW COMMAND
DISCONNECTS ALL TERMINATION LINES
■ 2.5pF OUTPUT CAPACITANCE DURING
DISCONNECT
■ 500nA SUPPLY CURRENT IN DISCONNECT
MODE
■ 800µA SUPPLY CURRENT DURING NORMAL
OPERATION
■ 100mA SINK CURRENT FOR ACTIVE
NEGATION
■ LOGIC COMMAND DISCONNECTS ALL
TERMINATION LINES
■ CURRENT LIMIT AND THERMAL PROTECTION
■ COMPATIBLE WITH SCSI 1, 2, 3, AND
FAST-20 STANDARDS
■ HOT SWAP COMPATIBLE
IMPORTANT: For the most current data, consult LinFinity's web site: http://www.linfinity.com.
PRODUCT HIGHLIGHT
R E C E I V I N G W AV E F O R M - 20MH Z
D R I V I N G W AV E F O R M - 20MH Z
Driver
Receiver
Disconnect 1
Disconnect 2
LX5205
PnP
1 Meter, AWG 28
LX5268
LX5205
PnP
0 to 70
SOWB
DWP Plastic
28-pin, Power
LX5205CDWP
Note: All surface-mount packages are available in Tape & Reel.
Append the letter "T" to part number. (i.e. LX5205CDWPT)
Copyright © 1998
Rev. 0.7 3/98
Disconnect 2
LX5268
PA C K A G E O R D E R I N F O
TA (°C)
Disconnect 1
NOTE:
For An In-Depth
Discussion On Applying
SCSI, Request Linfinity
Application Note:
"Understanding The
Single-Ended SCSI Bus"
LINFINITY MICROELECTRONICS INC.
11861 W ESTERN A VENUE, G ARDEN G ROVE, CA. 92841, 714-898-8121, F AX: 714-893-2570
1
PRODUCT DATABOOK 1996/1997
LX5205
18-L INE P LUG
P
AND
P LAY , µP OWER SCSI TERMINATOR
R E L I M I N A R Y
A B S O L U T E M A X I M U M R AT I N G S
D
A T A
S
H E E T
PACKAGE PIN OUTS
(Note 1)
TermPwr Voltage ................................................................................................. +7V
Signal Line Voltage ................................................................................... 0V to +7V
Regulator Output Current ................................................................................... 1.2A
Operating Junction Temperature
Plastic (DWP Package) ................................................................................. 150°C
Storage Temperature Range .............................................................. -65°C to 150°C
Lead Temperature (Soldering, 10 seconds) .................................................... 300°C
DISCONNECT 1
T1
T2
T3
T4
T5
HEAT SINK/GND
GND
HEAT SINK/GND
T6
T7
T8
T9
VTERM
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.
T H E R M A L D ATA
DWP PACKAGE:
THERMAL RESISTANCE-JUNCTION TO LEADS, θJL
18°C/W
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θ JA
40°C/W
1
28
2
27
3
26
4
25
5
24
6
23
7
22
8
21
9
20
10
19
11
18
12
17
13
16
14
15
DISCONNECT 2
T18
T17
T16
T15
T14
HEAT SINK/GND
HEAT SINK/GND
HEAT SINK/GND
T13
T12
T11
T10
REG OUT
DWP PACKAGE
(Top View)
Junction Temperature Calculation: TJ = TA + (PD x θJA).
The θ JA numbers are guidelines for the thermal performance of the device/pc-board
system. All of the above assume no ambient airflow.
POWER UP / POWER DOWN FUNCTION T ABLE
2
Disconnect 1
Disconnect 2
Outputs
Quiescent
Current
H
H
L
L
Open
H
L
H
L
Open
Disabled
Enabled
Enabled
Disabled
Disabled
0.5µA
800µA
800µA
80µA
0.5µA
Copyright © 1998
Rev. 0.7 3/98
PRODUCT DATABOOK 1996/1997
LX5205
18-L INE P LUG
P
AND
P LAY , µP OWER SCSI T ERMINATOR
D
R E L I M I N A R Y
A T A
S
H E E T
R E C O M M E N D E D O P E R AT I N G C O N D I T I O N S
Parameter
Symbol
Termpwr Voltage
Signal Line Voltage
Disconnect Input Voltage
Output Capacitance on REGOUT
Operating Virtual Junction Temperature Range
LX5205C
(Note 2)
Recommended Operating Conditions
Min.
Typ.
Max.
VTERM
Units
4
0
0
4.7
5.25
5
VTERM
V
V
V
µF
0
125
°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 = 4.75V,
DISCONNECT 1 = DISCONNECT 2 = 2.2V. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures
equal to the ambient temperature.)
Parameter
Symbol
Test Conditions
Min.
LX5205
Typ.
Max.
Units
Supply Current Section
Termpwr Supply Current
Power Down Mode
All term lines Open
All term lines 0.5V
DISCONNECT 1,2 = Open
0.8
390
0.5
1.5
415
1
mA
mA
µA
110
2.9
-21.8
-21.8
-21.8
-21.8
10
2.5
70
120
-23
-23
-23
-23
400
Ω
V
mA
mA
mA
mA
nA
pF
mA
20
50
1.0
-1000
V
mV
mV
V
mA
°C
Output Section (Terminator Lines)
Terminator Impedance
Terminator Output High Voltage
Max. Output Current
Output Leakage
Output Capacitance
Sink Current
ITERM = -5mA to -15mA
VOUT = 0.5V, T A = 25°C
VOUT = 0.5V, 0°C ≤ T A ≤ 70°C
VOUT = 0.5V, VTERM = 4V, TA = 25°C
VOUT = 0.5V, VTERM = 4V
DISCONNECT 1,2 = Open, VTERM = 0V to 5.25V
DISCONNECT 1,2 = Open
VOUT = 4V
100
2.7
-20.3
-19.0
-19.5
-18.0
58
Regulator Section
Regulator Output Voltage
Line Regulation
Load Regulation
Drop Out Voltage
Short Circuit Current
Thermal Shutdown
3.6
10
20
0.45
-700
150
VTERM = 4V to 6V
I REG = 0 to -100mA
I REG = -100mA
VREG = 0V
Disconnect Section
Disconnect Threshold
Input Current
Copyright © 1998
Rev. 0.7 3/98
0.8
Disconnect 1 = Disconnect 2 = 0V
Disconnect 1 = Disconnect 2 = 2.2V
2.0
-28
-25
V
µA
µA
3
PRODUCT DATABOOK 1996/1997
LX5205
18-L INE P LUG
P
AND
P LAY , µP OWER SCSI TERMINATOR
R E L I M I N A R Y
D
A T A
S
H E E T
BLOCK DIAGRAM
FIGURE 1 — LX5205 BLOCK DIAGRAM
REG OUT
VTERM
VTERM
DISCONNECT 1
Channel
1 of 18
DISCONNECT 2
VBG
T0
VTERM
T17
A P P L I C A T I O N S C H E M AT I C
FIGURE 2 — 8-BIT SCSI SYSTEM APPLICATION
Narrow
REGOUT
TERM POWER
VTERM
DB (0)
DB (1)
DB (0)
DB (1)
ACK
RST
MSG
ACK
RST
MSG
LX5205
REGOUT
5V
4.7µF
PnP
DISCONNECT
LX5205
4.7µF
PERIPHERAL
VTERM
~ ~
4.7µF
HOST
~ ~ ~
5V
PnP
DISCONNECT
Narrow
TERM POWER
4.7µF
SCSI CABLE
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.
4
Copyright © 1998
Rev. 0.7 3/98