UCC5614_14 [TI]
9-LINE 3 TO 5 VOLT LOW CAPACITANCE SCSI ACTIVE TERMINATOR;
| 型号： | UCC5614_14 |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | 9-LINE 3 TO 5 VOLT LOW CAPACITANCE SCSI ACTIVE TERMINATOR |
| 文件： | 总5页 (文件大小：356K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
UCC5614
9-Line 3-5 Volt Low Capacitance SCSI Active Terminator
FEATURES
DESCRIPTION
•
Complies with SCSI, SCSI-2 and
SCSI-3 Standards
The UCC5614 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.
•
•
2.7V to 7V Operation
The UCC5614 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 0.5µA, which makes the IC attractive for battery powered systems.
1.8pF Channel Capacitance during
Disconnect
•
•
0.5µA Supply Current in Disconnect
Mode
110 Ohm/2.5k Programmable
Termination
The UCC5614 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 UCC5614 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 low, and discon-
nected when driven high. 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 low, 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 high.
continued
BLOCK DIAGRAM
UDG-94029-1
Circuit Design Patented
12/94
UCC5614
Description Continued
The power amplifier output stage allows the UCC5614 to most importantly, to trim the output current to a 4% toler-
source full termination current and sink active negation ance, as close to the max SCSI-3 spec as possible,
current when all termination lines are actively negated.
which maximizes noise margin in fast SCSI operation.
The UCC5614 is pin for pin compatible with Unitrode’s Other features include thermal shutdown and current
other 9 line SCSI terminators, allowing lower capacitance limit.
and lower voltage upgrades to existing systems. The
This device is offered in low thermal resistance versions
UCC5614, as with all Unitrode terminators, is completely
of the industry standard 16 pin narrow body SOIC, 16 pin
hot pluggable and appears as high impedance at the ter-
ZIP (Zig-Zag In Line package), 24 pin TSSOP and 28 pin
minating channels with VTRMPWR = 0V or open.
PLCC.
Internal circuit trimming is utilized, first to trim the 110
ohm termination impedance to a 7% tolerance, and then
ABSOLUTE MAXIMUM RATINGS
RECOMMENDED OPERATING CONDITIONS
Termpwr Voltage . . . . . . . . . . . . . . . . . . . . . . . . . 2.7V to 5.25V
Signal Line Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . 0V to +5V
Disconnect Input Voltage . . . . . . . . . . . . . . . . . . 0V to Termpwr
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
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.
CONNECTION DIAGRAMS
DIL-16 (Top View)
N or J Package
ZIP-16 (Top View)
Z Package
Note: Drawings are not to scale.
2
UCC5614
CONNECTION DIAGRAMS (cont.)
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.
ELECTRICAL CHARACTERISTICS Unless otherwise stated, these specifications apply for TA = 0°C to 70°C.
TRMPWR = 3.3V, DISCNCT = 0V, 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 = Termpwr
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
(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 = 2.4V, TRMPWR = 0V to 5.25V
DISCNCT = 2.4V (Note 2) (DP Package)
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 = 2.4V, TRMPWR = 0 to 5.25V
DISCNCT = 2.4V (Note 2) (DP Package)
−1
Output Leakage
Output Capacitance
Regulator Section
Regulator Output Voltage
Drop Out Voltage
10
1.8
5.25V > TRMPWR > 3V
All Termination Lines = 0.2V
VREG = 0V
2.5
2.7
0.1
3.0
0.2
V
V
Short Circuit Current
−200 −400 −800
mA
3
UCC5614
ELECTRICAL CHARACTERISTICS (cont.) Unless otherwise stated, these specifications apply for TA = 0°C to 70°C.
TRMPWR = 3.3V, DISCNCT = 0V, RDISCNCT= 0 ohms. TA = TJ.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX UNITS
Regulator Section (cont.)
Sinking Current Capability
Thermal Shutdown
VREG = 3V
(Note 2)
(Note 2)
200
400
170
10
800
mA
°C
Thermal Shutdown Hysteresis
Disconnect Section
Disconnect Threshold
Input Current
°C
RDISCNCT = 0 & 80k
DISCNCT = 0V
0.8
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
Figure 1: Typical SCSI Bus Configurations Utilizing 2 UCC5614 Devices
Figure 2: Typical Wide SCSI Bus Configurations Utilizing 3 UCC5614 Devices.
UNITRODE INTEGRATED CIRCUITS
7 CONTINENTAL BLVD. • MERRIMACK, NH 03054
TEL. (603) 424-2410 • FAX (603) 424-3460
4
IMPORTANT NOTICE
Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue
any product or service without notice, and advise customers to obtain the latest version of relevant information
to verify, before placing orders, that information being relied on is current and complete. All products are sold
subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those
pertaining to warranty, patent infringement, and limitation of liability.
TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in
accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent
TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily
performed, except those mandated by government requirements.
CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF
DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL
APPLICATIONS”). TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, AUTHORIZED, OR
WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT DEVICES OR SYSTEMS OR OTHER
CRITICAL APPLICATIONS. INCLUSION OF TI PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO
BE FULLY AT THE CUSTOMER’S RISK.
In order to minimize risks associated with the customer’s applications, adequate design and operating
safeguards must be provided by the customer to minimize inherent or procedural hazards.
TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent
that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other
intellectual property right of TI covering or relating to any combination, machine, or process in which such
semiconductor products or services might be or are used. TI’s publication of information regarding any third
party’s products or services does not constitute TI’s approval, warranty or endorsement thereof.
Copyright 1999, Texas Instruments Incorporated
相关型号：
©2020 ICPDF网 联系我们和版权申明