UCC5622FQP [TI]
27 - Line SCSI Terminator With Split Disconnect;
| 型号： | UCC5622FQP |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | 27 - Line SCSI Terminator With Split Disconnect |
| 文件： | 总5页 (文件大小：289K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
UCC5622
27 - Line SCSI Terminator With Split Disconnect
FEATURES
DESCRIPTION
• Complies with SCSI, SCSI-2, SCSI-3, The UCC5622 provides 27 lines of active termination for a SCSI (Small
SPI and FAST-20 (Ultra) Standards
Computer Systems Interface) parallel bus. The SCSI standard recom-
mends active termination at both ends of the cable.
• 2.5pF Channel Capacitance During
Disconnect
The UCC5622 is ideal for high performance 5V SCSI systems. During dis-
connect the supply current is typically only 100µA, which makes the IC at-
tractive for lower powered systems.
• 100µA Supply Current in Disconnect
Mode
The UCC5622 features a split disconnect allowing the user to control termi-
nation lines 10 to 27 with disconnect one, DISCNCT1, and control terminia-
tion lines 1 to 9 with disconnect two, DISCNCT2.
• 4V To 7V Operation
• 110Ω Termination
The UCC5622 is designed with a low channel capacitance of 2.5pF, which
eliminates effects on signal integrity from disconnected terminators at in-
terim points on the bus.
• Completely Meets SCSI Hot Plugging
• –900mA Sourcing Current for
Termination
The power amplifier output stage allows the UCC5622 to source full termi-
nation current and sink active negation current when all termination lines
are actively negated.
• +500mA Sinking Current for Active
Negation
• Logic Command Disconnects all
Termination Lines
The UCC5622, as with all Unitrode terminators, is completely hot plugga-
ble and appears as high impedance at the teminating channels with
V
= 0V or open.
TRMPWR
• Split Disconnect Controls Lines 1 to 9
and 10 to 27 Separately
Internal circuit trimming is utilized, first to trim the 110Ω impedance, and
then most importantly, to trim the output current as close to the maximum
SCSI-3 specification as possible, which maximizes noise margin in FAST-
20 SCSI operation.
• Trimmed Impedance to 5%
• Current Limit and Thermal Shutdown
Protection
(continued)
BLOCK DIAGRAM
UDG-96113
Circuit Design Patented
10/98
UCC5622
CONNECTION DIAGRAM
ABSOLUTE MAXIMUM RATINGS
TRMPWR Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +7V
Signal Line Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . 0V to +7V
Regulator Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . 1.5A
Storage Temperature . . . . . . . . . . . . . . . . . . . 65°C to +150°C
Junction Temperature. . . . . . . . . . . . . . . . . . . 55°C to +150°C
Lead Temperature (Soldering, 10 Sec.). . . . . . . . . . . . . +300°C
SSOP-44 (Top View)
MWP Package
Currents are positive into, negative out of the specified termi-
nal. Consult Packaging Section of Databook for thermal limita-
tions and considerations of packages.
LQFP-48 (Top View)
MWP Package
DESCRIPTION (cont.)
Other features include thermal shutdown and current limit.
This device is offered in low thermal resistance versions
of the industry standard 44 pin wide body QSOP (MWP)
and 48 pin LQFP (FQP). Consult QSOP-44 and LQFP-48
Packaging Diagram for exact dimensions.
ELECTRICAL CHARACTERISTICS Unless otherwise stated, these specifications apply for TA = 0°C to 70°C,
TRMPWR = 4.75V, DISCNCT1 = DSCNCT2 = 0V, TA = TJ.
PARAMETER
Supply Current Section
TRMPWR Supply Current
TEST CONDITIONS
MIN
TYP
MAX
UNITS
All Termination Lines = Open
1
2
mA
mA
µA
All Termination Lines = 0.2V
630
100
650
200
Power Down Mode
DISCNCT1 = DSCNCT2 = TRMPWR
2
UCC5622
ELECTRICAL CHARACTERISTICS Unless otherwise stated, these specifications apply for TA = 0°C to 70°C,
TRMPWR = 4.75V, DISCNCT1 = DSCNCT2 = 0V, TA = TJ.
PARAMETER
Output Section (Termination Lines)
Termination Impedance
Output High Voltage
TEST CONDITIONS
MIN
TYP
MAX
UNITS
(Note 3)
(Note 1)
104.5
2.6
110
2.8
23.3
23.3
23
115.5
3.0
24
Ω
V
Max Output Current
VLINE = 0.2V, TJ = 25 C
22.1
20.7
21
mA
mA
mA
mA
mA
nA
VLINE = 0.2V
24
VLINE = 0.2V, TRMPWR = 4V, TJ = 25°C (Note 1)
VLINE = 0.2V, TRMPWR = 4V (Note 1)
VLINE = 0.5V
24
20
23
24
22.4
400
Output Leakage
DISCNCT1 = DISCNCT2 = 2.4V, TRMPWR = 0V to
5.25V
10
Output Capacitance
Regulator Section
DISCNCT1 = DISCNCT2 = 2.4V (Note 2)
2.5
4
pF
Regulator Output Voltage
Drop Out Voltage
2.6
2.8
0.4
3.0
0.8
V
V
All Termination Lines = 0.2V
VREG = 0V
Short Circuit Current
650
300
900 –1300
mA
mA
°C
°C
Sinking Current Capability
Thermal Shutdown
VREG = 3.5V
500
170
10
900
Thermal Shutdown Hysteresis
Disconnect Section
Disconnect Threshold DISCNCT1
Input Current DISCNCT1
Controls Lines 10 to 27
DISCNCT1 = 0V
0.8
0.8
1.5
–10
1.5
2.0
–30
2
V
µA
V
Disconnect Threshold DISCNCT2 Controls Lines 1 to 9
Input Current DISCNCT2 DISCNCT2 = 0V
–10
–30
µA
Note 1:Measuring each termination line while other 26 are low (0.2V).
Note 2:Guaranteed by design. Not 100% tested in production.
Note 3: Tested by measuring IOUT with VOUT = 0.2V and VOUT with no load, then calculate:
−
=
PIN DESCRIPTIONS
DISCNCT1: Disconnect one controls termination lines GND: Ground reference for the IC.
10 – 27. Taking this pin high or leaving it open causes
L1 – L27: 110Ω termination channels.
termination lines 10 - 27 to become high impedence, tak-
ing this pin low allows the channels to provide normal ter-
mination.
REG: Output of the internal 2.7V regulator.
TRMPWR: Power for the IC.
DISCNCT2: Disconnect two controls termination lines
1 – 9. Taking this pin high or leaving it open causes
termination lines 1 - 9 to become high impedence. Taking
this pin low allows the channels to provide normal
terminiation. Taking both disconnect pins high or leaving
them open will put the chip in to sleep mode where it will
be in low-power mode.
3
UCC5622
UDG-98172
Figure 1. Typical Wide SCSI Bus Configuration Using the UCC5622
UNITRODE CORPORATION
7 CONTINENTAL BLVD MERRIMACK, NH 03054
TEL (603) 424-2410 FAX (603) 424-3460
4
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