View LX5225CDWP_1268682.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

LIN D O C #: 5225
UltraMAX
T
HE
TM
LX5225
AND
ULTRA 18-LINE, PLUG
I
NFINITE
PLAY SCSI TERMINATOR
D
ATA
P
OWER
OF
I
N N O VAT I O N
P
RODUCTION
S
HEET
DESCRIPTION
The LX5225 SCSI terminator is part of Linfinity's UltraMAX family of high-performance, adaptive, non-linear mode SCSI products, which are designed to deliver true UltraSCSI performance in SCSI applications. The low voltage BiCMOS architecture employed in its design offers superior performance to older linear passive and active techniques. Linfinity's UltraMAX architecture employs high-speed adaptive elements for each channel, thereby providing the fastest response possible -- typically 35MHz, which is 100 times faster than the older linear regulator/terminator approach used by other manufacturers. Products using this older linear regulator approach have bandwidths which are dominated by the output capacitor and which are limited to 500KHz (see further discussion in the Functional Description section). The UltraMAX architecture also eliminates the output compensation capacitor typical in earlier terminator designs. Each is approved for use with SCSI1, -2, -3, UltraSCSI and beyond -- providing the highest performance alternative available today. The LX5225 architecture is much more tolerant of marginal system integrations. A key improvement offered by the LX5225 lies in its ability to ensure reliable, error-free communications even in systems which do not adhere to recommended SCSI hardware design guidelines, such as the use of improper cable lengths and impedances. Frequently, this situation is not controlled by the peripheral or host designer and, when problems occur, they are the first to be made aware of the problem. To enter the disconnect mode, the disconnect pins must be driven low thereby disconnecting the LX5225 from the SCSI bus. The LX5225 has two disconnect pins for SCSI Plug and Play (PnP) applications. Quiescent current is less than 150A in this mode. Reduced component counts is also inherent in the LX5225 architecture. Traditional termination techniques require large stabilization and transient protection capacitors of up to 20F in value and size. The LX5225 architecture does not require these components, allowing all the cost savings associated with inventory, board space, assembly, reliability, and component costs. The LX5225 is a superior pin-for-pin replacement for the LX5205 and the UCC5607.
K E Y F E AT U R E S
s SCSI Plug And Play, Dual Low Disconnect, Logic Low Command Disconnects All Termination Lines s Ultra-Fast Response For Fast-20 SCSI Applications s 35MHz Channel Bandwidth s Sleep-Mode Current Less Than 150A s NO External Compensation Capacitors s Compatible With Active Negation Drivers s Compatible With Passive And Active Terminations s Approved For Use With SCSI 1, 2, 3 And Ultra SCSI s Hot Swap Compatible s Pin-For-Pin Compatible With LX5205 And UC5607
NOTE: For current data & package dimensions, visit our web site: http://www.linfinity.com.
PRODUCT HIGHLIGHT
R E C E I V I N G W AV E F O R M - 2 0 M HZ
D R I V I N G WAV E F O R M - 2 0 M HZ
Receiver
DISC 1 DISC 2
Driver 1 Meter, AWG 28 LX5225 PnP
DISC 1 DISC 2
LX5225 PnP
LX5268
LX5268
PA C K A G E O R D E R I N F O TA (C) 0 to 70
DWP Plastic SOWB 28-pin, Power
LX5225CDWP
Note: All surface-mount packages are available in Tape & Reel. Append the letter "T" to part number. (i.e. LX5225CDWPT)
Copyright (c) 1999 Rev. 1.0 5/99
NOTE: For An In-Depth Discussion On Applying SCSI, Request Linfinity Application Note: "Understanding The Single-Ended SCSI Bus"
LINFINITY MICROELECTRONICS INC.
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
1
PRODUCT DATABOOK 1996/1997
LX5225
ULTRA 18-LINE, PLUG
P
AND
UltraMAX
PLAY SCSI TERMINATOR
D
ATA RODUCTION
S
HEET
A B S O L U T E M A X I M U M R AT I N G S
(Note 1)
PACKAGE PIN OUTS
DISC1 T1 T2 T3 T4 T5 HEAT SINK/GND GND HEAT SINK/GND T6 T7 T8 T9 VTERM
1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15
TermPwr Voltage ................................................................................................. +7V Signal Line Voltage ................................................................................... 0V to +7V Operating Junction Temperature Plastic (DWP Packages) ............................................................................... 150C Storage Temperature Range .............................................................. -65C to 150C Lead Temperature (Soldering, 10 seconds) .................................................... 300C
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 MAL DATA
DWP PACKAGE: THERMAL RESISTANCE-JUNCTION TO LEADS, JL THERMAL RESISTANCE-JUNCTION TO AMBIENT, JA 18C/W 40C/W
DISC2 T18 T17 T16 T15 T14 HEAT SINK/GND HEAT SINK/GND HEAT SINK/GND T13 T12 T11 T10 N.C.
DWP PACKAGE (Top View)
Junction Temperature Calculation: TJ = TA + (PD x JA). The JA numbers are guidelines for the thermal performance of the device/pc-board system. All of the above assume no ambient airflow.
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
Termpwr Voltage Signal Line Voltage Disconnect Input Voltage Operating Virtual Junction Temperature Range LX5225C Note 2. Range over which the device is functional.
(Note 2)
Symbol
VTERM
Recommended Operating Conditions Min. Typ. Max.
4.0 0 0 0 5.5 5 VTERM 125
Units
V V V C
ELECTRICAL CHARACTERISTICS
Term Power = 4.75V unless otherwise specified. Unless otherwise specified, these specifications apply at the recommended operating ambient temperature of TA = 25C. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient temperature.
Parameter
Output High Voltage TermPwr Supply Current
Symbol
VOUT ICC
Test Conditions
Min.
2.65
LX5225 Typ. Max.
2.85 10 424 50 -22 15 450 150 -24 -10 1
Units
V mA mA A mA A A MHz mA
Output Current Disconnect Input Current Output Leakage Current Channel Bandwidth Termination Sink Current, per Channel
IOUT IIN IOL BW ISINK
All data lines = open All data lines = 0.2V DISC1 and DISC2 Pins < 0.8V VOUT = 0.2V DISC1 and DISC2 Pins = 0V DISC1 and DISC2 Pins = < 0.8V, VO = 0.2V VOUT = 4V
-20
35 7
2
Copyright (c) 1999 Rev. 1.0 5/99
PRODUCT DATABOOK 1996/1997
UltraMAX
ULTRA 18-LINE, PLUG
P
AND
LX5225
PLAY SCSI TERMINATOR
D
ATA RODUCTION
S
HEET
BLOCK DIAGRAM
FIGURE 1 -- LX5225 BLOCK DIAGRAM
TERM POWER
CURRENT BIASING CIRCUIT
24mA CURRENT LIMITING CIRCUIT
DATA OUTPUT PIN DB(0)
2.85V
DISC1 DISC2 1.4V 1 OF 18 CHANNELS
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
5V
4.7F
TERM POWER
VTERM
HOST
PERIPHERAL
TERM POWER
VTERM
4.7F
5V
PnP DISCONNECT
LX5225
LX5225
ACK RST MSG
ACK RST MSG
~~~
SCSI CABLE
Copyright (c) 1999 Rev. 1.0 5/99
PnP DISCONNECT
DB (0) DB (1)
~~
DB (0) DB (1)
3
PRODUCT DATABOOK 1996/1997
LX5225
ULTRA 18-LINE, PLUG
P
AND
UltraMAX
PLAY SCSI TERMINATOR
D
ATA RODUCTION
S
HEET
FUNCTIONAL DESCRIPTION
To enable the device a DISC1 and DISC2 pins must be pulled Cable transmission theory suggests to optimize signal speed Logic High. During this mode of operation, quiescent current and quality, the termination should act both as an ideal voltage is 10mA and the device will respond to line demands by reference when the line is released (deasserted) and as an delivering 24mA on assertion and by imposing 2.85V on ideal current source when the line is active (asserted). Common deassertion. In order to active terminators, which POWER UP / POWER DOWN FUNCTION TABLE disable the device, the consist of Linear RegulaDISC1 and DISC2 pins tors in series with resisQuiescent DISC 1 DISC 2 Outputs must be driven logic Low. tors (typically 110), are Current This mode of operation a compromise. As the H H Disabled 15mA places the device in a sleep line voltage increases, state where a meager the amount of current deH L Enabled 15mA 150A of quiescent current creases linearly by the L H Enabled 15mA is consumed. Additionally, equation V = I * R. The L L Disabled 150A all outputs are in a Hi-Z LX5225, with its unique (impedance) state. Sleep new architecture applies Open Open Disabled 150A mode can be used for the maximum amount of power conservation or to completely eliminate the terminator current regardless of line voltage until the termination high from the SCSI chain. threshold (2.85V) is reached. An additional feature of the LX5225 is its compatibility with Acting as a near ideal line terminator, the LX5225 closely active negation drivers. reproduces the optimum case when the device is enabled.
UltraMAX is a trademark of Linfinity Microelectronics Inc.
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.
4
Copyright (c) 1999 Rev. 1.0 5/99

▲Up To Search▲

Price & Availability of LX5225CDWP

	To Download LX5225CDWP Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .