TI UC5604

UC5604
9-Line Low Capacitance SCSI Active Terminator
FEATURES
DESCRIPTION
•
Complies with SCSI, SCSI-2
Standards
•
9pF Channel Capacitance during
Disconnect
The UC5604 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
•
−300mA Sourcing Current for
Termination
•
+40mA Sinking Current for Active
Negation
•
Logic Command Disconnects all
Termination Lines
•
Trimmed Termination Current to 7%
•
Trimmed Impedance to 7%
•
Current Limit and Thermal
Shutdown Protection
The UC5604 provides a disconnect feature which, when opened or driven
high, will disconnect all terminating resistors and disable the regulator,
greatly reducing standby power. The output channels remain high impedance even without Termpwr applied.
The UC5604 is pin-for-pin compatible with its predecessor, the UC5603 - 9
line Active Terminator. The only functional difference between the UC5604
and UC5603 is the absence of the negative clamps. Parametrically, the
UC5604 has a 7% tolerance on impedance and current compared to a 3%
tolerance on the UC5603 and the sink current is reduced from 300mA to
40mA. Custom power packages are utilized to allow normal operation at
full power conditions (1.2 watts).
Internal circuit trimming is utilized, first to trim the impedance to a 7% tolerance, and then most importantly, to trim the output current to a 7% tolerance, as close to the max SCSI spec as possible, which maximizes 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-94064
Circuit Design Patented
3/97
UC5604
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.
ZIP-16 (Top View)
Z Package
SOIC-16 (Top View)
DP Package
* DP package pin 5 serves as signal ground; pins 4, 12, 13
serve as heatsink/ground.
Note: Drawings are not to scale.
2
UC5604
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
VLINE = 0.5V, TRMPWR = 4V (Note 1)
Output Clamp Level
Output Leakage
ILINE = -30mA
0°C < TJ < 70°C
TJ = 25°C
TJ = 25°C
0°C < TJ < 70°C
TJ = 25°C
0°C < TJ < 70°C
97
2.55
2.6
-19.5
-18.5
-18.0
-17.0
-0.2
DISCNCT = 4V TRMPWR = 0V to 5.25V VLINE = 0 to 4V
REG = 0V
VLINE = 5.25V
TRMPWR = 0V to 5.25V, REG = Open
VLINE = 0V to 5.25V
DISCNCT = Open (Note 2)
Output Capacitance
Regulator Section
Regulator Output Voltage
Regulator Output Voltage
All Termination Lines = 5V
Line Regulation
TRMPWR = 4V to 6V
Load Regulation
IREG = +100mA to -100mA
Drop Out Voltage
All Termination Lines = 0.5V
Short Circuit Current
VREG = 0V
Sinking Current Capability
VREG = 3.5V
Thermal Shutdown
Thermal Shutdown Hysteresis
Disconnect Section
Disconnect Threshold
Threshold Hysteresis
Input Current
DISCNCT = 0V
Note 1: Measuring each termination line while other 8 are low (0.5V).
Note 2: Guaranteed by design. Not 100% tested in production.
2.5
2.55
-200
20
1.1
TYP
MAX
UNITS
14
200
100
20
220
150
mA
mA
µA
110
10
129
3.2
3.1
-22.4
-22.4
-22.4
-22.4
0.1
400
100
400
Ohms
V
V
mA
mA
mA
mA
V
nA
µA
nA
9
12
pF
2.9
2.9
10
20
1.0
-400
40
170
10
3.2
3.1
20
50
1.2
-600
V
V
mV
mV
V
mA
mA
°C
°C
1.4
100
150
1.7
V
mV
µA
2.9
-21.9
-21.9
-21.9
-21.9
-0.05
10
200
APPLICATION INFORMATION
UDG-94065
Figure 1: Typical SCSI Bus Configurations Utilizing 2 UC5604 Devices
3
UC5604
APPLICATION INFORMATION (cont.)
UDG-94066
Figure 2: Typical Wide SCSI Bus Configurations Utilizing 3 UC5604 Devices.
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4
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