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UC5612
9-Line Low Capacitance SCSI Active Terminator
FEATURES
* * * * * * * Complies with SCSI, SCSI-2 and SPI-2 Standards 5pF Channel Capacitance during Disconnect Meets SCSI Hot Plugging -400mA Sourcing Current for Termination +100mA Sinking Current for Active Negation 1V Dropout Voltage Regulator Logic High Command Disconnects all Termination Lines 100A Supply Current in Disconnect Mode Trimmed Termination Current to 5% Trimmed Impedance to 5% Low Thermal Resistance Surface Mount Packages
DESCRIPTION
The UC5612 provides 9 lines of active termination for a SCSI (Small Computer Systems Interface) parallel bus. The SCSI standard recommends active termination at both ends of the cable segment. The only functional differences between the UC5603 and UC5612 is the absence of the negative clamps on the output lines. Parametrically, the UC5612 has a 5% tolerance on impedance and current compared to a 3% tolerance on the UC5603. Custom power packages are utilized to allow normal operation at full power (2 Watts). The UC5612 provides a disconnect feature which, when opened or driven high, disconnects all terminating resistors, disables the regulator and greatly reduces standby power consumption. The output channels remain high impedance even without Termpwr applied. A low channel capacitance of 5pF allows interim points of the bus to have little to no effect on the signal integrity. Internal circuit trimming is utilized, first to trim the impedance to a 5% tolerance, and then most importantly, to trim the output current to a 5% tolerance, as close to the maximum SCSI specification as possible. This maximizes the noise margin in fast SCSI operation. Other features include thermal shutdown and current limit. This device is offered in low thermal resistance versions of the industry standard 16 pin narrow body SOIC, 16 pin ZIP (zig-zag in line package) and 24 pin TSSOP.
* * * *
BLOCK DIAGRAM
UDG-94133
Circuit Design Patented
3/97
UC5612
ABSOLUTE MAXIMUM RATINGS
Termpwr Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +7V Signal Line Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . 0V to +7V Regulator Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . 0.6A 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
DIL-16 (Top View) N or J Package ZIP-16 (Top View) Z Package
SOIC-16 (Top View) DP Package
TSSOP-24 (Top View) PWP Package
* DP package pin 5 serves as signal ground; pins 4, 12, 13 serve as heatsink/ground.
* PWP package pin 9 serves as signal ground; pins 5, 6, 7, 8, 17, 18, 19, and 20 serve as heatsink/ground.
Note: Drawings are not to scale.
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UC5612
ELECTRICAL CHARACTERISTICS Unless otherwise stated, these specifications apply for TA = 0C to 70C.
TRMPWR = 4.75V, DISCNCT = 0V, TA = TJ. PARAMETER Supply Current Section Termpwr Supply Current TEST CONDITIONS MIN TYP 17 200 100 104.5 2.65 -20.3 -19.8 -19.5 -19.0 -21.6 110 2.9 -21.5 -21.5 -21.5 -21.5 -24.0 10 10 5 2.7 2.7 2.9 2.9 10 1.0 -400 100 170 10 1.4 -10 MAX 23 225 150 115.5 3.1 -22.4 -22.4 -22.4 -22.4 -25.4 400 100 400 6 3.1 3.1 20 1.2 -600 400 UNITS mA mA A Ohms V mA mA mA mA mA nA A nA pF V V mV V mA mA C C V A
All termination lines = Open All termination lines = 0.5V Power Down Mode DISCNCT = Open Output Section (Termination Lines) Terminator Impedance ILINE = -5mA to -15mA Output High Voltage Max Output Current VLINE = 0.5V Max Output Current
Output Leakage
Output Capacitance Regulator Section Regulator Output Voltage Line Regulation Drop Out Voltage Short Circuit Current Sinking Current Capability Thermal Shutdown Thermal Shutdown Hysteresis Disconnect Section Disconnect Threshold Input Current
TJ = 25C 0C < TJ < 70C VLINE = 0.5V, TRMPWR = 4V (Note 1) TJ = 25C 0C < TJ < 70C VLINE = 0.2V, TRMPWR = 4V to 5.25V 0C < TJ < 70C DISCNCT = 4V REG = 0V VLINE = 0 to 4V TRMPWR = 0V to 5.25V VLINE = 5.25V REG = Open VLINE = 0V to 5.25V DISCNCT = Open (Note 2) (DP Package)
All Termination Lines = 4V TRMPWR = 4V to 6V All Termination Lines = 0.5V REG = 0V REG = 3.5V
-200 75
1.1 DISCNCT = 0V
1.7 -20
Note 1: Measuring each termination line while other 8 are low. Note 2: Guaranteed by design. Not 100% tested in production.
APPLICATION INFORMATION
UDG-94134
Figure 1: Typical SCSI Bus Configurations Utilizing 2 UC5612 Devices
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UC5612
APPLICATION INFORMATION (cont.)
UDG-94135
Figure 2: Typical Wide SCSI Bus Configurations Utilizing 3 UC5612 Devices.
UNITRODE CORPORATION 7 CONTINENTAL BLVD. * MERRIMACK, NH 03054 TEL. (603) 424-2410 * FAX (603) 424-3460
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Copyright (c) 1999, Texas Instruments Incorporated

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