UC5603NTR [TI]
IC SCSI BUS TERMINATOR, Bus Terminator;
| 型号： | UC5603NTR |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | IC SCSI BUS TERMINATOR, Bus Terminator |
| 文件： | 总5页 (文件大小：257K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
UC5603
9-Line SCSI Active Terminator
FEATURES
DESCRIPTION
•
•
•
Complies with SCSI, SCSI-2 and
SPI-2 Standards
The UC5603 provides 9 lines of active termination for a SCSI (Small Comput-
ers Systems Interface) parallel bus. The SCSI standard recommends active
termination at both ends of the cable segment.
6pF Channel Capacitance during
Disconnect
The UC5603 provides a disconnect feature which, when opened or driven
high, will disconnect 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 6pF allows units
at interim points of the bus to have little to no effect on the signal integrity.
100µA Supply Current in
Disconnect Mode
•
•
Meets SCSI Hot Plugging
Functionally the UC5603 is similar to its predecessor, the UC5601 - 18 line
Active Terminator. Several electrical enhancements were incorporated in the
UC5603, such as a sink/source regulator output stage to accommodate all
signal lines at +5V, while the regulator remains at its nominal value, reduced
channel capacitance to 6pF typical, and as with the UC5601, custom power
packages are utilized to allow normal operation at full power conditions (1.2
watts).
-400mA Sourcing Current for
Termination
•
•
•
+400mA Sinking Current for
Active Negation Drivers
Logic Command Disconnects all
Termination Lines
Trimmed Termination Current to
3%
Internal circuit trimming is utilized, first to trim the impedance to a 3% toler-
ance, and then most importantly, to trim the output current to a 3% tolerance,
as close to the max SCSI spec as possible, which maximizes noise margin in
fast SCSI operation.
•
•
Trimmed Impedance to 3%
Negative Clamping on all Signal
Lines
Other features include negative clamping on all signal lines to protect exter-
nal circuitry from latch-up, thermal shutdown and current limit.
•
Current Limit and Thermal
Shutdown Protection
This device is offered in low thermal resistance versions of the industry stand-
ard 16 pin narrow body SOIC, 16 pin ZIP (zig-zag in line package) and 24 pin
TSSOP.
BLOCK DIAGRAM
UDG-94049
Circuit Design Patented
3/97
UC5603
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 posi-
tive into, negative out of the specified terminal.
Consult Packaging Section of Unitrode Integrated Circuits databook for thermal limita-
tions 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
TSSOP-24 (Top View)
PWP 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
UC5603
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
TYP
MAX UNITS
All termination lines = Open
12
18
mA
mA
µA
All termination lines = 0.5V
DISCNCT = Open
200
100
220
150
Power Down Mode
Output Section (Terminator Lines)
Terminator Impedance
Output High Voltage
∆ILINE = -5mA to -15mA
VTRMPWR = 4V (Note 1)
VLINE = 0.5V
107
2.7
110
2.9
113 Ohms
V
Max Output Current
TJ = 25°C
0°C < TJ < 70°C -20.5 -21.9 -22.4
TJ = 25°C -20.3 -21.9 -22.4
0°C < TJ < 70°C -19.8 -21.9 -22.4
VLINE = 0.2V, TRMPWR = 4.0V to 5.25V 0°C < TJ < 70°C –22.0 –24.0 –25.4
-21.1 -21.9 -22.4
mA
mA
mA
mA
mA
V
Max Output Current
VLINE = 0.5V, TRMPWR = 4V (Note 1)
Output Clamp Level
Output Leakage
ILINE = -30mA
-0.2
-0.05
10
0.1
400
100
400
TRMPWR = 0V to 5.25V VLINE = 0 to 4V
REG = 0V
nA
µA
nA
VLINE = 5.25V
DISCNCT = 4V
TRMPWR = 0V to 5.25V, REG = Open
VLINE = 0V to 5.25V
10
6
Output Capacitance
Regulator Section
DISCNCT = Open (Note 2) (DP Package)
8
pF
Regulator Output Voltage
Regulator Output Voltage
Line Regulation
2.8
2.8
2.9
2.9
10
3
3
V
V
All Termination Lines = 5V
TRMPWR = 4V to 6V
IREG = +100mA to -100mA
All Termination Lines = 0.5V
VREG = 0V
20
50
1
mV
mV
V
Load Regulation
20
Drop Out Voltage
0.7
-400
400
170
10
Short Circuit Current
Sinking Current Capability
Thermal Shutdown
-200
200
-600
600
mA
mA
°C
°C
VREG = 3.5V
Thermal Shutdown Hysteresis
Disconnect Section
Disconnect Threshold
Threshold Hysteresis
1.3
1.5
1.7
V
100
160
250
mV
Note 1: Measuring each termination line while other 8 are low (0.5V).
Note 2: Guaranteed by design. Not 100% tested in production.
3
UC5603
APPLICATION INFORMATION
UDG-94050
Figure 1: Typical Wide SCSI Bus Configurations Utilizing 1 UC5601 and 1 UC5603 Device
UDG-94051
Figure 2: Typical Wide SCSI Bus Configurations Utilizing 3 UC5603 Devices.
UNITRODE CORPORATION
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4
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