View UC5609_260249.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

UC5609
18-Line Low Capacitance SCSI Active Terminator
FEATURES
* * * * * * * * * * * * Reverse Disconnect Complies with SCSI, SCSI-2 and SPI-2 Standards 6pF Channel Capacitance during Disconnect 100A Supply Current in Disconnect Mode Meets SCSI Hot Plugging Capability -650mA Sourcing Current for Termination +200mA Sinking Current for Active Negation Provides Active Termination for 18 Lines Logic Command Disconnects all Termination Lines Trimmed Termination Current to 5% Trimmed Impedance to 5% Current Limit and Thermal Shutdown Protection
DESCRIPTION
The UC5609 provides 18 lines of active termination for a SCSI (Small Computer Systems Interface) parallel bus. The SCSI standard recommends active termination at both ends of the bus cable. The UC5609 is pin-for-pin compatible with its predecessors, the UC5601, UC5602 and UC5608 - 18 Line Active Terminators, except for the reverse disconnect sense. Parametrically the UC5609 has a 5% tolerance on impedance and current compared to a 3% tolerance on the UC5601 and the sink current is increased from 20 to 200mA. The low side clamps have been removed. Custom power packages are utilized to allow normal operation at full power conditions (2 Watts). When in disconnect mode the terminator will disconnect all terminating resistors and disable the regulator, greatly reducing standby power. The output channels remain high impedance even without Termpwr applied. Internal circuit trimming is utilized to trim the impedance to a 5% tolerance and, most importantly, to trim the output current to a 5% tolerance, as close to the max SCSI spec as possible, which maximizes noise margin in fast SCSI operation. Other features include 4.0 to 5.25V Termpwr, thermal shutdown and current limit. This device is offered in low thermal resistance versions of the industry standard 28 pin wide body SOIC, 28 pin wide body TSSOP, and 28 pin PLCC, as well as 24 pin DIP.
BLOCK DIAGRAM
UDG-94126
Circuit Design Patented
4/97
UC5609 ABSOLUTE MAXIMUM RATINGS
Termpwr Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +7V Signal Line Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0V to +7V Regulator Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1A Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -65C to +150C Operating Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55C to +150C Lead Temperature (Soldering, 10 Sec.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +300C Unless otherwise specified all voltages are with respect to Ground. Currents are positive into, negative out of the specified terminal. Consult Packaging Section of Unitrode Integrated Circuits databook for thermal limitations and considerations of packages.
RECOMMENDED OPERATING CONDITIONS
Termpwr Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.8V to 5.25V Signal Line Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0V to +5V Disconnect Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0V to Termpwr
CONNECTION DIAGRAMS
PLCC-28 (Top View) QP Package TSSOP-28 (Top View) PWP Package
* QP package pins 12 - 18 serve as both heatsink and signal ground.
* PWP package pin 23 serves as signal ground; pins 7, 8, 9, 20, 21 and 22 serve as heatsink/ground.
SOIC-28 (Top View) DWP Package
DIL-24 (Top View) N or J Package
* DWP package pin 28 serves as signal ground; pins 7, 8, 9, 20, 21, 22 serve as heatsink/ground.
Note: Drawings are not to scale.
2
UC5609
ELECTRICAL CHARACTERISTICS Unless otherwise stated, these specifications apply for TA = 0C to 70C. TRMPWR =
4.75V, DISCNCT = 2.4V. TA = TJ. PARAMETER Supply Current Section Termpwr Supply Current TEST CONDITIONS MIN TYP 17 400 100 110 2.9 -21.5 -21.5 -21.5 -21.5 -24.0 10 10 6 2.9 2.9 10 1.0 -650 200 170 10 1.4 MAX 25 430 150 115.5 3.0 -22.4 -22.4 -22.4 -22.4 -25.4 400 100 400 7 3 3 20 1.2 -950 500 UNITS mA mA A V mA mA mA mA mA nA A nA pF V V mV V mA mA C C V
All termination lines = Open All termination lines = 0.5V Power Down Mode DISCNCT = GND Output Section (Terminator Lines) Terminator Impedance ILINE = -5mA to -15mA Output High Voltage VTRMPWR = 4V (Note 1) Max Output Current VLINE = 0.5V Max Output Current
Output Leakage
Output Capacitance Regulator Section Regulator Output Voltage Regulator Output Voltage Line Regulation Drop Out Voltage Short Circuit Current Sinking Current Capability Thermal Shutdown Thermal Shutdown Hysteresis Disconnect Section Disconnect Threshold
104.5 2.65 TJ = 25C -20.3 0C < TJ < 70C -19.8 TJ = 25C -19.5 VLINE = 0.5V, TRMPWR = 4V (Note 1) 0C < TJ < 70C -19.0 0C < TJ < 70C -21.6 VLINE = 0.2V, TRMPWR = 4V to 5.25V TRMPWR = 0V to 5.25V VLINE = 0 to 4V DISCNCT = GND REG = 0V VLINE = 5.25V TRMPWR = 0V to 5.25V, REG = Open VLINE = 0V to 5.25V DISCNCT = GND (Note 2) 2.8 2.8
All Termination Lines = 4V TRMPWR = 4V to 6V All Termination Lines = 0.5V VREG = 0V VREG = 3.5V
-450 100
1.1
1.7
Note 1: Measuring each termination line while other 17 are low (0.5V). Note 2: Guaranteed by design. Not 100% tested in production.
APPLICATION INFORMATION
UDG-94127
Figure 1: Typical SCSI Bus Configuration
UNITRODE CORPORATION 7 CONTINENTAL BLVD. * MERRIMACK, NH 03054 TEL. (603) 424-2410 * FAX (603) 424-3460
3
IMPORTANT NOTICE Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those pertaining to warranty, patent infringement, and limitation of liability. TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with TI's standard warranty. Testing and other quality control techniques are utilized to the extent TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed, except those mandated by government requirements. CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE ("CRITICAL APPLICATIONS"). TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, AUTHORIZED, OR WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT DEVICES OR SYSTEMS OR OTHER CRITICAL APPLICATIONS. INCLUSION OF TI PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO BE FULLY AT THE CUSTOMER'S RISK. In order to minimize risks associated with the customer's applications, adequate design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other intellectual property right of TI covering or relating to any combination, machine, or process in which such semiconductor products or services might be or are used. TI's publication of information regarding any third party's products or services does not constitute TI's approval, warranty or endorsement thereof.
Copyright (c) 1999, Texas Instruments Incorporated

▲Up To Search▲

Price & Availability of UC5609

	To Download UC5609 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .