UCC5606_15 [TI]
9-LINE TO 5 VOLT SCSI ACTIVE TERMINATOR, REVERSE DISCONNECT;
| 型号： | UCC5606_15 |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | 9-LINE TO 5 VOLT SCSI ACTIVE TERMINATOR, REVERSE DISCONNECT |
| 文件： | 总5页 (文件大小：386K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
UCC5606
9-Line 3-5 Volt SCSI Active Terminator, Reverse Disconnect
FEATURES
DESCRIPTION
•
Complies with SCSI, SCSI-2 and
SCSI-3 Standards
The UCC5606 provides 9 lines of active termination for a SCSI (Small
Computer Systems Interface) parallel bus. The SCSI standard recom-
mends active termination at both ends of the cable segment.
•
•
2.7V to 7V Operation
The UCC5606 is ideal for high performance 3.3V SCSI systems. The key
features contributing to such low operating voltage are the 0.1V drop out
regulator and the 2.7V reference. The reduced reference voltage was
necessary to accommodate the lower termination current dictated in the
SCSI-3 specification. During disconnect the supply current is typically
only 1µA, which makes the IC attractive for battery powered systems.
1.8pF Channel Capacitance during
Disconnect
•
•
1µA Supply Current in Disconnect
Mode
110 Ohm/2.5k Programmable
Termination
The UCC5606 is designed with an ultra low channel capacitance of
1.8pF, which eliminates effects on signal integrity from disconnected ter-
minators at interim points on the bus.
•
•
Completely Meets SCSI Hot Plugging
-400mA Sourcing Current for
Termination
The UCC5606 can be programmed for either a 110 ohm or 2.5k ohm ter-
mination. The 110 ohm termination is used for standard SCSI bus lengths
and the 2.5k ohm termination is typically used in short bus applications.
When driving the TTL compatible DISCNCT pin directly, the 110 ohm ter-
mination is connected when the DISCNCT pin is driven high, and discon-
nected when low. When the DISCNCT pin is driven through an
impedance between 80k and 150k, the 2.5k ohm termination is con-
nected when the DISCNCT pin is driven high, and disconnected when
•
+400mA Sinking Current for Active
Negation Drivers
•
•
•
Trimmed Termination Current to 4%
Trimmed Impedance to 7%
Current Limit and Thermal Shutdown
Protection
driven low.
continued
BLOCK DIAGRAM
UDG-94067-1
Circuit Design Patented
5/95
UCC5606
Description Continued
The power amplifier output stage allows the UCC5606 to Internal circuit trimming is utilized, first to trim the 110
source full termination current and sink active negation ohm termination impedance to a 7% tolerance, and then
current when all termination lines are actively negated.
most importantly, to trim the output current to a 4% toler-
ance, as close to the max SCSI-3 spec as possible,
which maximizes noise margin in fast SCSI operation.
The UCC5606 is pin for pin compatible with Unitrode’s
other 9 line SCSI terminators, except that DISCNCT is
now active low, allowing lower capacitance and lower Other features include thermal shutdown and current
voltage upgrades to existing systems. The UCC5606, as limit.
with all Unitrode terminators, is completely hot pluggable
This device is offered in low thermal resistance versions
and appears as high impedance at the terminating chan-
of the industry standard 16 pin narrow body SOIC, 16 pin
nels with VTRMPWR = 0V or open.
ZIP (Zig-Zag In Line package), 24 pin TSSOP and 28 pin
PLCC.
ABSOLUTE MAXIMUM RATINGS
CONNECTION DIAGRAMS
Termpwr Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +7V
Signal Line Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . 0V to +7V
Regulator Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . 0.6A
Storage Temperature . . . . . . . . . . . . . . . . . . . −65°C to +150°C
Operating Temperature . . . . . . . . . . . . . . . . . −55°C to +150°C
Lead Temperature (Soldering, 10 Sec.). . . . . . . . . . . . . +300°C
ZIP-16 (Top View)
Z Package
Unless otherwise specified all voltages are with respect to
Ground. Currents are positive into, negative out of the speci-
fied terminal.
Consult Packaging Section of Unitrode Integrated Circuits dat-
abook for thermal limitations and considerations of packages.
RECOMMENDED OPERATING CONDITIONS
Termpwr Voltage . . . . . . . . . . . . . . . . . . . . . . . . . 2.7V to 5.25V
Signal Line Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . 0V to +5V
Disconnect Input Voltage . . . . . . . . . . . . . . . . . . 0V to Termpwr
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 5 serves as signal ground; pins 6, 7, 8, 9,
17, 18, 19, and 20 serve as heatsink/ground.
Note: Drawings are not to scale.
2
UCC5606
CONNECTION DIAGRAMS (cont.)
DIL-16 (Top View)
N or J Package
Note: Drawings are not to scale.
ELECTRICAL CHARACTERISTICS Unless otherwise stated, these specifications apply for TA = 0°C to 70°C.
TRMPWR = 3.3V, DISCNCT = 3.3V, RDISCNCT = 0 ohms. TA = TJ.
PARAMETER
Supply Current Section
Termpwr Supply Current
TEST CONDITIONS
MIN
TYP
MAX UNITS
All termination lines = Open
1
2
218
5
mA
mA
µA
All termination lines = 0.2V
DISCNCT = 0V
210
0.5
Power Down Mode
Output Section (110 ohms - Terminator Lines)
Terminator Impedance
102.3 110 117.7 Ohms
Output High Voltage
Max Output Current
TRMPWR = 3V (Note 1)
2.5
−22.1 −23
−21 −23
−20.2 −23
2.7
3.0
−24
−24
−24
−24
−22.4
400
2.5
V
VLINE = 0.2V, TJ = 25°C
mA
mA
mA
mA
mA
nA
VLINE = 0.2V
VLINE = 0.2V, TRMPWR = 3V, TJ = 25°C (Note 1)
VLINE = 0.2V, TRMPWR = 3V (Note 1)
VLINE = 0.5V
−19
−23
Output Leakage
DISCNCT = 0V, TRMPWR = 0V to 5.25V
DISCNCT = 0V, DP Package (Note 2)
10
Output Capacitance
1.8
pF
Output Section (2.5k ohms - Terminator Lines) (RDISCNCT = 80k ohms)
Terminator Impedance
2
2.5
2.7
−1
3
kΩ
V
Output High Voltage
Max Output Current
TRMPWR = 3V (Note 1)
2.5
3.0
VLINE = 0.2V
−0.7
−0.6
−1.4
−1.5
400
2.5
mA
mA
nA
pF
VLINE = 0.2V, TRMPWR = 3V (Note 1)
DISCNCT = 0V, TRMPWR = 0 to 5.25V
DISCNCT = 0V, DP Package (Note 2)
−1
Output Leakage
Output Capacitance
Regulator Section
Regulator Output Voltage
Drop Out Voltage
10
1.8
5.25V > TRMPWR > 3V
2.5
2.7
0.1
3.0
0.2
V
V
All Termination Lines = 0.2V
3
UCC5606
ELECTRICAL CHARACTERISTICS (cont.) Unless otherwise stated, these specifications apply for TA=0°C to 70°C.
TRMPWR = 3.3V, DISCNCT = 3.3V, RDISCNCT = 0 ohms. TA = TJ.
PARAMETER
Regulator Section (cont.)
Short Circuit Current
TEST CONDITIONS
MIN
TYP
MAX UNITS
VREG = 0V
VREG = 3V
(Note 2)
−200 −400 −800
mA
mA
°C
Sinking Current Capability
Thermal Shutdown
200
0.8
400
170
10
800
Thermal Shutdown Hysteresis
Disconnect Section
Disconnect Threshold
Input Current
(Note 2)
°C
RDISCNCT = 0 & 80k
DISCNCT = 3.3V
1.5
30
2.0
50
V
µA
Note 1: Measuring each termination line while other 8 are low (0.2V).
Note 2: Guaranteed by design. Not 100% tested in production.
APPLICATION INFORMATION
UDG-94068
Figure 1: Typical SCSI Bus Configurations Utilizing 2 UCC5606 Devices
UDG-94069
Figure 2: Typical Wide SCSI Bus Configurations Utilizing 3 UCC5606 Devices.
UNITRODE INTEGRATED CIRCUITS
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4
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