LIN D O C #: 5204
LX5204
9-L I N E H O T S WA P , µP O W E R SCSI T E 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
P
N N O VA T I O N
R O D U C T I O N
DESCRIPTION
The LX5204 is a nine-line active terminator
for the SCSI parallel bus. This SCSI standard
recommends active termination at both
ends of the SCSI bus. The LX5204 has the
added features of hot swappability, fully
complying with the SCSI hot swap specification.
During disconnect mode, the LX5204 requires a meager 60µA of supply current while
offering only 3.5pF of output capacitance.
To enter this low-power mode, the disconnect pin can be left open (floating) or driven
high, 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, errorfree communications.
D
A T A
S
H E E T
K E Y F E AT U R E S
During normal operation, the LX5204
consumes only 600µA 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 LX5204 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
the LX5204 sinks up to 150mA of current,
making it compatible with today's fast
active negation drivers.
The LX5204 is a superior, pin-for-pin
replacement for a variety of industry products such as the UC5603 and UC5613.
■ 3.5pF OUTPUT CAPACITANCE DURING
DISCONNECT
■ HOT SWAP COMPATIBLE
■ 60µA SUPPLY CURRENT IN DISCONNECT MODE
■ 600µA SUPPLY CURRENT DURING
NORMAL OPERATION
■ 150mA SINK CURRENT FOR ACTIVE
NEGATION
■ LOGIC COMMAND DISCONNECTS ALL
TERMINATION LINES
■ CURRENT LIMIT AND THERMAL
PROTECTION
■ COMPATIBLE WITH SCSI 1, 2 AND 3
STANDARDS
■ CONSULT FACTORY FOR APPLICATION
TEST REPORT: 5204TR
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
Driver
Receiver
1 Meter, AWG 28
LX5204
LX5204
LX5268
LX5268
PA C K A G E O R D E R I N F O R M AT I O N
TA (°C)
0 to 70
TSSOP
PWP Plastic
24-pin, Power
LX5204CPWP
NOTE:
For An In-Depth
Discussion On Applying
SCSI, Request Linfinity
Application Note:
"Understanding The
Single-Ended SCSI Bus"
SOIC
DP Plastic
16-pin, Power
LX5204CDP
Note: All surface-mount packages are available in Tape & Reel.
Append the letter "T" to part number. (i.e. LX5204CDPT)
Copyright © 1997
Rev. 1.1 12/96
LINFINITY MICROELECTRONICS INC.
11861 W ESTERN A VENUE, G ARDEN G ROVE, CA. 92841, 714-898-8121, F AX: 714-893-2570
1
P R O D U C T D ATA B O O K 1 9 9 6 / 1 9 9 7
LX5204
9-L I N E H O T S WA P , µP O W E R SCSI T E R M I N AT O R
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 ........................................................................................... 0.4A
Operating Junction Temperature
Plastic (PWP, DP Packages) ................................................................................. 150°C
Storage Temperature Range ...................................................................... -65°C to 150°C
Lead Temperature (Soldering, 10 seconds) ............................................................. 300°C
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.
T7
T8
T9
N.C.
GND
N.C.
N.C.
Heatsink
N.C.
N.C.
DISCONNECT
T1
T2
T H E R MAL DATA
1
24
2
23
3
22
4
21
5
20
6
19
7
18
8
17
9
16
10
15
11
14
12
13
T6
T5
REG OUT
N.C.
N.C.
N.C.
Heatsink
N.C.
N.C.
N.C.
VTERM
T4
T3
PWP PACKAGE
(Top View)
PWP PACKAGE:
THERMAL RESISTANCE-JUNCTION TO LEADS, θJL
27°C/W
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θ JA
60°C/W
DP PACKAGE:
THERMAL RESISTANCE-JUNCTION TO LEADS, θJL
20°C/W
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θ JA
45°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.
T7
T8
T9
Heatsink { N.C.
GND
DISCONNECT
T1
T2
1
16
2
15
3
14
4
13
5
12
6
11
7
10
8
9
T6
T5
REG OUT
N.C. Heatsink
N.C.
VTERM
T4
T3
DP PACKAGE
(Top View)
POWER UP / POWER DOWN FUNCTION T ABLE
2
Disconnect
Outputs
Quiescent
Current
L
H
Open
Enabled
HI Z
HI Z
600µA
60µA
60µA
Copyright © 1996
Rev. 1.1 12/96
P R O D U C T D ATA B O O K 1 9 9 6 / 1 9 9 7
LX5204
9-L I N E H O T S WA P , µP O W E R SCSI T E R M I N AT O R
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 REGOUT
Operating Virtual Junction Temperature Range
LX5204C
(Note 2)
Recommended Operating Conditions
Min.
Typ.
Max.
VTERM
Units
4
0
0
2.2
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 ≤ T A ≤ 70°C. TermPwr = 4.75V, Disconnect = 0V. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient temperature.)
Parameter
Symbol
Test Conditions
Min.
LX5204
Typ.
Max.
Units
Supply Current Section
TermPwr Supply Current
Power Down Mode
All term lines = Open
All term lines = 0.5V
Disconnect = Open
0.6
194
60
1.2
208
100
mA
mA
µA
110
116
110
120
2.9
-21.8
-23
-21.8
-23
-21.8
-23
-21.8
-23
10
400
3.5
20
30
Fully Compliant
Ω
Ω
V
mA
mA
mA
mA
nA
pF
mA
3.6
10
20
0.7
-200
150
20
50
1.0
-350
V
mV
mV
V
mA
°C
2.0
40
V
µA
Output Section (Terminator Lines)
Terminator Impedance
Terminator Output High Voltage
Max. Output Current
Output Leakage
Output Capacitance
Sink Current
Hot Swap
ITERM = -5mA to -15mA, TA = 25°C
ITERM = -5mA to -15mA
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 = Open, VTERM = 0V to 5.25V
Disconnect = Open
VOUT = 4V
104
100
2.7
-20.3
-19.0
-19.5
-18.0
Regulator Section
Regulator Output Voltage
Line Regulation
Load Regulation
Drop Out Voltage
Short Circuit Current
Thermal Shutdown
VTERM = 4V to 6V
I REG = 0 to -50mA
IREG = -50mA
VREG = 0V
Disconnect Section
Disconnect Threshold
Input Current
Copyright © 1996
Rev. 1.1 12/96
0.8
Disconnect = 0V
3
P R O D U C T D ATA B O O K 1 9 9 6 / 1 9 9 7
LX5204
9-L I N E H O T S WA P , µP O W E R SCSI T E R M I N AT O R
P
R O D U C T I O N
D
A T A
S
H E E T
BLOCK DIAGRAM
FIGURE 1 — LX5204 BLOCK DIAGRAM
REG OUT
VTERM
VTERM
Channel
1 of 9
DISCONNECT
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)
~ ~ ~
REGOUT
REGOUT
2.2µF
TERMPWR
TERMPWR
~ ~
ATN
BSY
~ ~ ~
DISCONNECT
VTERM
ACK
RST
MSG
VTERM
SCSI CABLE
ATN
BSY
LX5204
REGOUT
2.2µF
2.2µF
LX5204
LX5204
2.2µF
5V
DISCONNECT
PERIPHERAL
DISCONNECT
2.2µF
~ ~
5V
DISCONNECT
HOST
TERM POWER
LX5204
ACK
RST
MSG
REGOUT
2.2µF
Note: Add third LX5204 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.
4
Copyright © 1996
Rev. 1.1 12/96