UCC5641PW28G4 [TI]
IC,TERMINATOR,BICMOS,TSSOP,28PIN,PLASTIC;
| 型号： | UCC5641PW28G4 |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | IC,TERMINATOR,BICMOS,TSSOP,28PIN,PLASTIC 信息通信管理 |
| 文件： | 总5页 (文件大小：73K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
UCC5641
Low Voltage Differential (LVD) SCSI 9 Line Terminator
FEATURES
DESCRIPTION
• First LVD only Active Terminator
The UCC5641 is an active terminator for Low Voltage Differential (LVD)
SCSI networks. This LVD only design allows the user to reach peak bus
performance while reducing system cost. The device is designed as an
active Y-terminator to improve the frequency response of the LVD Bus.
Designed with a 1.5pF channel capacitance, the UCC5641 allows for mini-
mal bus loading for a maximum number of peripherals. With the
UCC5641, the designer will be able to comply with the Fast-40 SPI-2 and
Fast-80 SPI-3 specifications. The UCC5641 also provides a much-needed
system migration path for ever improving SCSI system standards. This de-
vice is available in the 24 pin TSSOP and 28 pin TSSOP for ease of lay-
out use.
• Meets SCSI SPI-2 Ultra2 (Fast-40)
and Ultra3 / Ultra160 (Fast-80)
Standards
• 2.7V to 5.25V Operation
• Differential Failsafe Bias
• Reversed Disconnect Polarity
The UCC5641 is not designed for use in single ended or high voltage dif-
ferential systems.
BLOCK DIAGRAM
SOURCE ONLY FROM TRMPWR AND THE ENABLED TERMINATIONS
OPEN CIRCUIT ON POWER OFF
OR OPEN CIRCUIT IN A
DISABLED TERMINATOR MODE
SOURCE 5–15mA
SINK 200µA MAXIMUM (NOISE LOAD)
TRMPWR 28
2.7V to 5.25V
REF 1.3V
12
DIFSENS
1.3V 0.1V
HIGH POWER
DIFFERENTIAL
2.4V > 1.9V
DIFFB
11
20k
27 LVD*
HIGH IMPEDANCE RECEIVER
EVEN WITH POWER OFF
0.1µF
0.7V > 0.5V
SINGLE
ENDED
SOURCE/SINK REGULATOR
REF 1.25V
124
124
56mV
52
52
LOW
FREQUENCY
FILTER
–
+
L1–
L1+
4
3
56mV
50Hz – 60Hz
+
–
10µA
56mV
52
52
–
+
26 L9–
25 L9+
DISCNCT 15
56mV
+
–
GND
REG
14
1
4.7µF
UDG-99160
* 28 pin package only
SLUS397 - JANUARY 2000
UCC5641
CONNECTION DIAGRAMS
TSSOP-28 (Top View)
PW28 Package
TSSOP-24 (Top View)
PW24 Package
REG
L1+
L1–
L2+
L2–
L3+
L3–
L4+
L4–
1
2
3
4
5
6
7
8
9
24 TRMPWR
23 L9–
REG
N/C
L1+
L1–
L2+
L2–
L3+
L3–
L4+
1
2
3
4
5
6
7
8
9
28 TRMPWR
27 LVD
26 L9–
22 L9+
21 L8–
25 L9+
20 L8+
24 L8–
19 L7–
18 L7+
23 L8+
22 L7–
21 L7+
20 L6–
17 L6–
16 L6+
L4– 10
DIFFB 11
DIFSENS 12
N/C 13
19 L6+
18 L5–
DIFFB 10
15 L5–
DIFSENS
GND
11
12
14 L5+
17 L5+
13 DISCNCT
16 N/C
15 DISCNCT
GND 14
ABSOLUTE MAXIMUM RATINGS
TERMPWR Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +6V
Signal Line Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . 0V to 3.6V
Package Dissipation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1W
Storage Temperature . . . . . . . . . . . . . . . . . . . –65°C to +150°C
Junction Temperature. . . . . . . . . . . . . . . . . . . –55°C to +150°C
Lead Temperature (Soldering, 10 sec.) . . . . . . . . . . . . . +300°C
Currents are positive into negative out of the specified terminal.
consult Packaging Section of Databook for thermal limitations
and considerations of package.
RECOMMENDED OPERATING CONDITIONS
TERMPWR Voltage . . . . . . . . . . . . . . . . . . . . . . . 2.7V to 5.25V
ELECTRICAL CHARACTERISTICS: Unless otherwise stated, specifications apply for TA = 0°C to 70°C,
TRMPWR = 3.3V. TA = TJ.
PARAMETER
TRMPWR Supply Current Section
TRMPWR Supply Current
TEST CONDITIONS
MIN
TYP
MAX UNITS
No Load
Disabled Terminator
25
mA
µA
V
400
5.25
TRMPWR Voltage
2.7
2
UCC5641
ELECTRICAL CHARACTERISTICS: Unless otherwise stated, specifications apply for TA = 0°C to 70°C,
TRMPWR = 3.3V. TA = TJ.
PARAMETER
Regulator Section
TEST CONDITIONS
MIN
TYP
MAX UNITS
1.25V Regulator
DIFSENS connected to DIFFB
DIFSENS connected to DIFFB
DIFSENS connected to DIFFB
DIFFB connected to GND
DIFSENS to GND
1.15
1.25
–100
100
1.35
–80
V
1.25V Regulator Source Current
1.25V Regulator Sink Current
1.3V Regulator
mA
mA
V
80
1.2
–15
50
1.3
1.4
–5
1.3V Regulator Source Current
1.3V Sink Current
mA
µA
DIFSENS to 3.3V
200
Differential Termination Section
Differential Impedance
–2.5mA to 4.5mA
L+ connected to L–
No load, L+ or L–
100
110
100
1.15
105
150
110
165
125
1.35
400
Ω
Ω
mV
V
Common Mode Impedance
Differential Bias Voltage
Common Mode Bias
1.25
10
Output Leakage, Disconnect
DISCNCT, TRMPWR = 0 to 5.25V,
nA
VLINE = 0.2 to 5.25V
Output Capacitance
Single ended measurement to ground (Note 1)
3
pF
Low Voltage Differential (LVD) Status Bit Section
ISOURCE
VLOAD = 2.4V
–6
5
–4
mA
mA
ISINK
VLOAD = 0.4V
2
Disconnect & Differential Sense Input Section
DISCNCT Threshold
0.8
–30
0.5
1.9
2
V
µA
V
Input Current
At 0V and 3.3V
–10
Differential Sense SE to LVD Threshold
Differential Sense LVD to HPD Threshold
0.7
2.4
V
Note 1: Guaranteed by design. Not 100% tested in production.
PIN DESCRIPTION
DIFFB: Differential sense filter pin should be connected Ln +: Positive line for differential applications for the
SCSI Bus.
to a 0.1µF capacitor and 20k resistor to Diff Sense.
LVD: (28 pin package only) Indicates that the bus is in
DIFSENS: The SCSI bus differential sense line to detect
LVD mode.
what type of devices are connected to the SCSI Bus.
REG: Regulator bypass; must be connected to a 4.7 F
DISCNCT: Disconnect pin shuts down the terminator
capacitor to ground.
when it is not at the end of the bus.
TRMPWR: VIN 2.7V to 5.25V supply.
GND: Ground.
Ln –: Negative line in differential applications for the
SCSI Bus.
3
UCC5641
APPLICATION INFORMATION
UCC5641PW28
Termpower
UCC5641PW24
L1+
L1–
3
4
2
3
L1+
L1–
Termpower
28 TRMPWR
TRMPWR 24
27 LVD
CONTROL LINES (9)
L9+ 25
L9– 26
22 L9+
23 L9–
15 DISCNCT
DISCNCT 13
DIFF SENSE
12
11
REG
1
DIFFB
11
DIFFB
10
REG
1
20k
20k
4.7µF
4.7µF
0.1µF
0.1µF
UCC5641PW28
UCC5641PW24
L1+
L1–
3
4
2
3
L1+
L1–
28 TRMPWR
TRMPWR 24
DATA LINES (9)
4.7µF
L9+ 25
L9– 26
22 L9+
23 L9–
4.7µF
15 DISCNCT
DISCNCT 13
REG
1
DIFFB
11
DIFFB
10
REG
1
4.7µF
4.7µF
UCC5641PW28
UCC5641PW24
L1+
L1–
3
4
2
3
L1+
L1–
28 TRMPWR
TRMPWR 24
DATA LINES (9)
L9+ 25
L9– 26
22 L9+
23 L9–
15 DISCNCT
DISCNCT 13
REG
1
DIFFB
11
DIFFB
10
REG
1
S1*
S2*
4.7µF
4.7µF
UDG-99159
* CLOSE S1 AND S2 TO DISABLE TERMINATORS
Figure 1. Application diagram.
UNITRODE CORPORATION
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 acknowledgment, 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.
Customers are responsible for their applications using TI components.
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 2000, Texas Instruments Incorporated
相关型号：
©2020 ICPDF网 联系我们和版权申明