LIN DOC #:
LX5212
9-LINE LOW CAPACITANCE, µPOWER SCSI TERMINATOR
5212
THE INFINITE POWER OF INNOVATION
DESCRIPTION
The LX5212 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 LX5212 requires a meager 500nA of supply current
while offering only 2.5pF 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, error-free communications.
During normal operation, the LX5212
IMPORTANT: For the most current data, consult LinFinity's web site: http://www.linfinity.com.
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 LX5212 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 LX5212 sinks up to 30mA of current,
making it compatible with today's fast active
negation drivers.
The LX5212 is a superior, pin-for-pin
replacement for a variety of industry products, such as the UC5614.
PRODUCT HIGHLIGHT
P RODUCTION DATA SHEET
KEY FEATURES
■ 2.5pF OUTPUT CAPACITANCE DURING
DISCONNECT
■ 500nA SUPPLY CURRENT IN DISCONNECT
MODE
■ 600µA SUPPLY CURRENT DURING NORMAL
OPERATION
■ 30mA 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
■ CONSULT FACTORY FOR APPLICATION TEST
REPORT: 5212TR
■ EVALUATION BOARD AVAILABLE
RECEIVING WAVEFORM - 20MHZ
Receiver
LX5212 LX5212
PACKAGE ORDER INFORMATION
TA (°C)
0 to 70 LX5212CN LX5212CPWP LX5212CDP
Plastic DIP
N
16-pin
Note: All surface-mount packages are available in Tape & Reel.
Append the letter "T" to part number. (i.e. LX5212CDPT)
1 Meter, AWG 28
LX5268 LX5268
Plastic TSSOP
PWP
24-pin, Power
DRIVING WAVEFORM - 20MHZ
Driver
Discussion On Applying
SCSI, Request Linfinity
Application Note:
"Understanding The
Single-Ended SCSI Bus"
Plastic SOIC
DP
16-pin, Power
NOTE:
For An In-Depth
Copyright © 1997
Rev. 1.8 11/97
L INFINITY MICROELECTRONICS INC.
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
1
LX5212
PRODUCT DATABOOK 1996/1997
9-LINE LOW CAPACITANCE, µPOWER SCSI TERMINATOR
RODUCTION DATA SHEET
P
ABSOLUTE MAXIMUM RATINGS (Note 1)
TermPwr Voltage .................................................................................................+7V
Signal Line Voltage ................................................................................... 0V to +7V
Regulator Output Current ................................................................................... 0.4A
Operating Junction Temperature
Plastic (N, 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.
THERMAL DATA
N PACKAGE:
THERMAL RESISTANCE-JUNCTION TO AMBIENT,
θθ
θ
θθ
JA
65°C/W
PWP PACKAGE:
THERMAL RESISTANCE-JUNCTION TO LEADS,
θθ
θ
θθ
THERMAL RESISTANCE-JUNCTION TO AMBIENT,
JL
θθ
θ
θθ
JA
27°C/W
100°C/W
DP PACKAGE:
D
θθ
θ
θθ
JL
x θ
θθ
θ
θθ
JA
).
JA
THERMAL RESISTANCE-JUNCTION TO LEADS,
THERMAL RESISTANCE-JUNCTION TO AMBIENT,
Junction Temperature Calculation: T
numbers are guidelines for the thermal performance of the device/pc-board
The θ
JA
system. All of the above assume no ambient airflow.
= TA + (P
J
20°C/W
50°C/W
POWER UP / POWER DOWN FUNCTION TABLE
Disconnect Outputs
L Enabled 600µA
H HI Z 0.5µA
Open HI Z 0.5µA
Quiescent
Current
PACKAGE PIN OUTS
DISCONNECT
N.C.
GND
HEATSINK/GND
HEATSINK/GND
HEATSINK/GND
HEATSINK/GND
DISCONNECT
HEATSINK/GND
DISCONNECT
T7
1 16
T8
215
T9
314
N.C.
413
GND
512
611
T1
710
T2
89
N PACKAGE
(Top View)
T7
1 24
T8
223
T9
322
421
520
619
718
817
916
10 15
11 14
T1
12 13
T2
PWP PACKAGE
(Top View)
T7
T8
215
T9
314
T1
T2
413
512
611
710
89
GND
DP PACKAGE
(Top View)
16
T6
T5
REG OUT
N.C.
N.C.
V
TERM
T4
T3
T6
T5
REG OUT
N.C.
HEATSINK/GND
HEATSINK/GND
HEATSINK/GND
HEATSINK/GND
N.C.
V
TERM
T4
T3
T6
T5
REG OUT
HEATSINK/GND
HEATSINK/GND
V
TERM
T4
T3
2
Copyright © 1997
Rev. 1.8 11/97
PRODUCT DATABOOK 1996/1997
LX5212
9-LINE LOW CAPACITANCE, µPOWER SCSI TERMINATOR
P RODUCTION DATA SHEET
RECOMMENDED OPERATING CONDITIONS (Note 2)
Parameter
TermPwr Voltage V
Symbol
TERM
Signal Line Voltage
Disconnect Input Voltage
Output Capacitor on REGOUT
Operating Virtual Junction Temperature Range
LX5212C
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 = 0V. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient temperature.)
Parameter
Symbol
Test Conditions Units
Supply Current Section
TermPwr Supply Current I
Power Down Mode I
All term lines = Open
TERM
All term lines = 0.5V
Disconnect = Open
TERM
Output Section (Terminator Lines)
Terminator Impedance Z
Terminator Output High Voltage V
Max. Output Current I
OUTIOUT
OUT
OUTVOUT
Output Leakage Disconnect = Open, V
Output Capacitance C
OUT
Sink Current V
= -5mA to -15mA, TA = 25°C
= -5mA to -15mA
I
OUT
= 0.5V, TA = 25°C
V
= 0.5V
OUT
V
= 0.5V, V
OUT
= 0.5V, V
V
OUT
Disconnect = Open, V
= 4V, TA = 25°C
TERM
= 4V
TERM
OUT
TERM
= 0.5V to 4V, TA = 25°C
= Open, V
Disconnect = Open, Note 3, DP Package
= 4V
OUT
Regulator Section
Regulator Output Voltage V
Line Regulation V
Load Regulation I
Drop Out Voltage V
Short Circuit Current I
Thermal Shutdown
REG
DOIREG
SC
= 4V to 6V
TERM
= 0 to -50mA
REG
= -50mA
V
= 0V
REG
Disconnect Section
Disconnect Threshold
Input Current Disconnect = 0V
Note 3. This parameter, while guaranteed by design, is not 100% production tested.
Recommended Operating Conditions
Min. Typ. Max.
Units
4 5.25 V
05V
0V
TERM
V
2.2 µF
0 125 °C
LX5212
Min. Typ. Max.
0.6 1.2 mA
194 210 mA
0.5 1 µA
104 110 116 Ω
100 110 120 Ω
2.7 2.9 V
-20.3 -21.8 -23 mA
-19.0 -21.8 -23 mA
-19.5 -21.8 -23 mA
-18.0 -21.8 -23 mA
10 100 nA
= 0.5V to 4V, TA = 25°C
OUT
20 30 mA
0.8 2.0 V
10 100 nA
1.8 2.5 pF
3.6 V
10 20 mV
20 50 mV
0.7 1.0 V
-200 -350 mA
150 °C
40 µA
Copyright © 1997
Rev. 1.8 11/97
3
LX5212
DISCONNECT
PRODUCT DATABOOK 1996/1997
9-LINE LOW CAPACITANCE, µPOWER SCSI TERMINATOR
RODUCTION DATA SHEET
P
BLOCK DIAGRAM
FIGURE 1 — LX5212 BLOCK DIAGRAM
REG OUT
V
TERM
V
TERM
Channel
1 of 9
5V
2.2µF
DISCONNECT
2.2µF
TERM POWER
V
TERM
LX5212
REGOUT
VBG
~
DB (0)
~
DB (1)
~
DB (6)
~
DB (7)
~
DB (P)
APPLICATION SCHEMATIC
FIGURE 2 — 8-BIT SCSI SYSTEM APPLICATION
HOST
PERIPHERAL
DB (0)
DB (1)
DB (6)
DB (7)
DB (P)
V
TERM
TERM POWER
V
TERM
LX5212
REGOUT
T0
T8
5V
2.2µF
DISCONNECTDISCONNECT
2.2µF
TERMPWR
DISCONNECT
2.2µF
Note: Add third LX5212 for 16-bit SCSI
4
V
TERM
LX5212
REGOUT
~
ATN
~
BSY
~
ACK
~
RST
~
MSG
PRODUCTION DATA - Information contained in this document is proprietary to LinFinity, 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.
SCSI CABLE
ATN
BSY
ACK
RST
MSG
V
LX5212
REGOUT
TERM
TERMPWR
2.2µF
Copyright © 1997
Rev. 1.8 11/97
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