Microsemi LX5107CDW 9-line low capacitance, î¼power scsi terminator Datasheet

LIN D O C #: 5107
LX5107
9-L INE L OW C APACITANCE , µP OWER SCSI T ERMINATOR
T
H E
I
N F I N I T E
P
O W E R
O F
I
P
N N O VA T I O N
R O D U C T I O N
DESCRIPTION
The LX5107 is a nine-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 LX5107
requires a meager 30µA of supply current
while offering only 3.0pF of output capacitance. To enter this low-power mode, the
disconnect pin should be 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 yield subsequent
reliable, error free communications.
During normal operation, the LX5107
consumes only 600µA of current which is
D
A T A
S
H E E T
K E Y F E AT U R E S
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 LX5107 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. In
addition, the LX5107 sinks up to 50mA of
current making it compatible with today's
fast active negation drivers.
The LX5107 is a superior, pin-for-pin
replacement for a variety of industry products such as the DS2107S and DS21S07A.
■ 3.0pF OUTPUT CAPACITANCE DURING
DISCONNECT
■ 30µA SUPPLY CURRENT IN DISCONNECT
MODE
■ 600µA SUPPLY CURRENT DURING NORMAL
OPERATION
■ 50mA SINK CURRENT FOR ACTIVE
NEGATION
■ LOGIC COMMAND DISCONNECTS ALL
TERMINATION LINES
■ CURRENT LIMIT AND THERMAL PROTECTION
■ COMPATIBLE WITH SCSI 1, 2 AND 3
STANDARDS
■ MEETS SCSI HOT PLUGGING CAPABILITY
■ CONSULT FACTORY FOR APPLICATION TEST
REPORT: 5107TR
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 - 10MH Z
D R I V I N G W AV E F O R M - 10MH Z
Receiver
Driver
1 Meter, AWG 28
LX5107
LX5107
LX5268
LX5268
PA C K A G E O R D E R I N F O R M AT I O N
TJ (°C)
0 to 70
SOWB
DW Plastic
16-pin
LX5107CDW
TSSOP
PWP Plastic
20-pin, Power
NOTE:
For An In-Depth
Discussion On Applying
SCSI, Request Linfinity
Application Note:
"Understanding The
Single-Ended SCSI Bus"
LX5107CPWP
Note: All surface-mount packages are available in Tape & Reel.
Append the letter "T" to part number. (i.e. LX5107CDWT)
Copyright © 1997
Rev. 1.2 11/97
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
LX5107
9-L INE L OW C APACITANCE , µP OWER SCSI T ERMINATOR
P
R O D U C T I O N
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 ................................................................................... 0.5A
Operating Junction Temperature
Plastic (DW, PW Packages) ......................................................................... 150°C
Storage Temperature Range .............................................................. -65°C to 150°C
Lead Temperature (Soldering, 10 seconds) .................................................... 300°C
VTERM
R1
R2
R3
R4
R5
VREF1
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.
1
16
2
15
3
14
4
13
5
12
6
11
7
10
8
9
PD
VREF2
N.C.
R9
R8
R7
R6
VTERM
DW PACKAGE
(Top View)
T H E R MAL DATA
DW PACKAGE:
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θ JA
95°C/W
PWP PACKAGE:
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
83°C/W
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
Outputs
Quiescent
Current
L
H
Open
HI Z
Enabled
Enabled
30µA
600µA
600µA
VTERM
HS-GND
R1
R2
R3
R4
R5
HS-GND
VREF1
GND
20
2
19
3
18
4
17
5
16
6
15
7
14
8
13
9
12
10
11
PD
VREF2
HS-GND
N.C.
R9
R8
R7
R6
HS-GND
VTERM
PWP PACKAGE
(Top View)
Copyright © 1997
Rev. 1.2 11/97
PRODUCT DATABOOK 1996/1997
LX5107
9-L INE L OW C APACITANCE , µP OWER SCSI T ERMINATOR
P
R O D U C T I O N
D
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 Capacitor on VREF
Operating Virtual Junction Temperature Range
LX5107C
(Note 2)
Recommended Operating Conditions
Min.
Typ.
Max.
VTERM
Units
4
0
0
2.2
5.25
5
VTERM
V
V
V
µF
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 ≤ T A ≤ 70°C. TermPwr = 4.75V, Disconnect = Open. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient temperature.)
Parameter
Symbol
Test Conditions
Min.
LX5107
Typ.
Max.
Units
Supply Current Section
TermPwr Supply Current
All term lines = Open
All term lines = 0.5V
Disconnect = Low
Power Down Mode
0.6
194
30
2.0
210
70
mA
mA
µA
Output Section (Terminator Lines)
Terminator Impedance
ITERM = -5mA to -15mA, TA = 25°C
ITERM = -5mA to -15mA
Terminator Output High Voltage
Max. Output Current
VOUT = 0.5V, T A = 25°C
VOUT = 0.5V, 0°C ≤ TA ≤ 70°C
VOUT = 0.5V, V TERM = 4V, TA = 25°C
VOUT = 0.5V, V TERM = 4V, 0°C ≤ TA ≤ 70°C
Disconnect = Low, VOUT = 0V to 4.0V, TA = +25°C
Disconnect = Low
VOUT = 4V
Output Leakage
Output Capacitance
Sink Current
100
2.6
-20.3
-19.0
-19.5
-18.0
30
110
110
2.9
-21.8
-21.8
-21.8
-21.8
10
3.0
50
120
-23
-23
-23
-23
250
Ω
Ω
V
mA
mA
mA
mA
nA
pF
mA
Regulator Section
Regulator Output Voltage
Line Regulation
Load Regulation
Drop Out Voltage
Short Circuit Current
Thermal Shutdown
VREF
3.6
10
20
0.7
-425
150
VTERM = 4V to 6V
I REG = 0 to -50mA
IREG = -50mA
VREG = 0V
20
50
1.0
-600
V
mV
mV
V
mA
°C
2.0
65
V
µA
Disconnect Section
Disconnect Threshold
Input Current
Copyright © 1997
Rev. 1.2 11/97
0.8
Disconnect = 0V
1.4
3
PRODUCT DATABOOK 1996/1997
LX5107
9-L INE L OW C APACITANCE , µP OWER SCSI T ERMINATOR
P
R O D U C T I O N
D
A T A
FIGURE INDEX
H E E T
GRAPH / CURVE INDEX
Application Circuits
FIGURE #
S
Characteristic Curves
FIGURE #
1.
LX5107 BLOCK DIAGRAM
3.
OUTPUT CURRENT vs. JUNCTION TEMPERATURE
2.
8-BIT SCSI SYSTEM APPLICATION
4.
OUTPUT VOLTAGE vs. JUNCTION TEMPERATURE
5.
OUTPUT CURRENT vs. TERMPWR
6.
OUTPUT CURRENT vs. OUTPUT VOLTAGE
7.
OUTPUT VOLTAGE vs. TERMPWR
8.
TERMPWR SUPPLY CURRENT vs. TEMPERATURE
9.
OUTPUT LEAKAGE vs. OUTPUT VOLTAGE
10. OUTPUT CURRENT vs. OUTPUT LINE (OUTPUT MATCHING)
11. OUTPUT VOLTAGE vs. TIME (HOTSWAP GRAPH)
4
Copyright © 1997
Rev. 1.2 11/97
PRODUCT DATABOOK 1996/1997
LX5107
9-L INE L OW C APACITANCE , µP OWER SCSI T ERMINATOR
P
R O D U C T I O N
D
A T A
S
H E E T
BLOCK DIAGRAM
FIGURE 1 — LX5107 BLOCK DIAGRAM
VREF
VTERM
VTERM
DISCONNECT
Channel
1 of 9
VBG
T0
VTERM
T8
A P P L I C AT I O N S C H E M AT I C
FIGURE 2 — 8-BIT SCSI SYSTEM APPLICATION
TERM POWER
VTERM
~ ~
VTERM
DB (0)
DB (1)
DB (0)
DB (1)
DB (6)
DB (7)
DB (P)
DB (6)
DB (7)
DB (P)
TERMPWR
~ ~ ~
VREF
TERMPWR
~ ~
ATN
BSY
~ ~ ~
DISABLE
VTERM
ACK
RST
MSG
VREF
VREF
2.2µF
TERMPWR
TERMPWR
VTERM
SCSI CABLE
ATN
BSY
LX5107
2.2µF
2.2µF
LX5107
LX5107
2.2µF
5V
DISABLE
DISABLE
2.2µF
PERIPHERAL
DISABLE
HOST
TERM POWER
5V
LX5107
ACK
RST
MSG
VREF
2.2µF
Note: Add third LX5107 for 16-bit SCSI
PRODUCTION DATA - Information contained in this document is proprietary to Lin Finity, and is current as of publication date. This document
may not be modified in any way without the express written consent of LinFinity. Product processing does not necessarily include testing of
all parameters. Linfinity reserves the right to change the configuration and performance of the product and to discontinue product at any time.
Copyright © 1997
Rev. 1.2 11/97
5
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