TI UC5613

UC5613
9-Line Low Capacitance SCSI Active Terminator
FEATURES
DESCRIPTION
•
Complies with SCSI, SCSI-2 and
SPI-2 Standards
•
3pF Channel Capacitance during
Disconnect
The UC5613 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.
•
100µA Supply Current in
Disconnect Mode
•
Meets SCSI Hot Plugging Capability
•
−400mA Sourcing Current for
Termination
•
+400mA Sinking Current for Active
Negation
•
Logic Command Disconnects all
Termination Lines
•
Trimmed Termination Current to 5%
•
Trimmed Impedance to 5%
•
Current Limit and Thermal
Shutdown Protection
The UC5613 provides a disconnect feature which, when opened or driven
high, disconnects all terminating resistors and disables the regulator
greatly reducing standby power. The output channels remain high impedance even without Termpwr applied. A low channel capacitance of 3pF allows units at interim points of the bus to have little or no effect on the signal
integrity.
The UC5613 is pin-for-pin compatible with its predecessor, the UC5603 - 9
line Active Terminator. The only functional difference between the UC5613
and UC5603 is the absence of the negative clamps. Parametrically, the
UC5613 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 (1.2 watts).
Internal circuit trimming is utilized, first to trim the impedance to a 5% tolerance; then, the output current is trimmed to a 5% tolerance. The output
current trim is set as close as possible to the maximum value of the SCSI
specification which maximizes the noise margin for 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-94003-1
3/97
Circuit Design Patented
UC5613
ABSOLUTE MAXIMUM RATINGS
Termpwr Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +7V
Signal Line Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0V to +7V
Regulator Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5A
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −65°C to +150°C
Operating Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −55°C to +150°C
Lead Temperature (Soldering, 10 Sec.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +300°C
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
TSSOP-24 (Top View)
PWP Package
DIL-16 (Top View)
N or J Package
* PWP package pin 5 serves as signal ground; pins 6, 7, 8, 9,
17, 18, 19, and 20 serve as heatsink/ground.
SOIC-16 (Top View)
DP Package
ZIP-16 (Top View)
Z Package
* DP package pin 5 serves as signal ground; pins 4, 12, 13
serve as heatsink/ground.
Note: Drawings are not to scale.
2
UC5613
ELECTRICAL CHARACTERISTICS Unless otherwise stated, these specifications apply for TA = 0°C to 70°C.
TRMPWR = 4.75V, DISCNCT = 0V. TA = TJ.
PARAMETER
Supply Current Section
Termpwr Supply Current
TEST CONDITIONS
MIN
All termination lines = Open
All termination lines = 0.5V
DISCNCT = Open
Power Down Mode
Output Section (Terminator Lines)
Terminator Impedance
∆ILINE = -5mA to -15mA
Output High Voltage
TRMPWR = 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
Load Regulation
Drop Out Voltage
Short Circuit Current
Sinking Current Capability
Thermal Shutdown
Thermal Shutdown Hysteresis
Disconnect Section
Disconnect Threshold
Threshold Hysteresis
Input Current
104.5
2.7
TJ = 25°C
-20.3
0°C < TJ < 70°C -19.8
TJ = 25°C
-19.5
VLINE = 0.5V, TRMPWR = 4V (Note 1)
0°C < TJ < 70°C -19.0
0°C < TJ < 70°C -21.6
VLINE = 0.2V, TRMPWR = 4V to 5.25V
TRMPWR
=
0V
to
5.25V
V
LINE = 0 to 4V
DISCNCT = 4V
REG = 0V
VLINE = 5.25V
TRMPWR = 0V to 5.25V, REG = Open
VLINE = 0V to 5.25V
DISCNCT = Open, DP Package (Note 2)
All Termination Lines = 5V
TRMPWR = 4V to 6V
IREG = +100mA to -100mA
All Termination Lines = 0.5V
VREG = 0V
VREG = 3.5V
2.8
2.8
-200
200
1.3
100
DISCNCT = 0V
TYP
MAX
UNITS
17
200
100
23
225
150
mA
mA
µA
110
2.9
-21.5
-21.5
-21.5
-21.5
-24.0
10
115.5
10
-22.4
-22.4
-22.4
-22.4
-25.4
400
100
400
Ohms
V
mA
mA
mA
mA
mA
nA
µA
nA
3
4.5
pF
2.9
2.9
10
20
0.7
-400
400
170
10
3
3
20
50
1
-600
600
V
V
mV
mV
V
mA
mA
°C
°C
1.5
160
10
1.7
250
15
V
mV
µA
Note 1: Measuring each termination line while other 8 are low (0.5V).
Note 2: Guaranteed by design. Not 100% tested in production.
APPLICATION INFORMATION
UDG-94007-1
Figure 1: Typical SCSI Bus Configurations Utilizing 2 UC5613 Devices
3
UC5613
APPLICATION INFORMATION (cont.)
UDG-94008-1
Figure 2: Typical Wide SCSI Bus Configurations Utilizing 3 UC5613 Devices.
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4
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